Order of the Czech Mining Office No. 60 / 2002 Coll.
Order of the Czech Mining Office amending Decree of the Czech Mining Office No. 246 / 1996 Coll., laying down more detailed conditions for the authorisation and checking of explosives, explosive articles and devices for circulation
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01.03.2002
22.02.2002
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60
DECLARATION
Czech Mining Office
of 25 January 2002
amending Decree No. 246 / 1996 of the Czech Mining Office Coll., laying down more detailed conditions for the authorisation and checking of explosives, explosive articles and devices for circulation
The Czech Mining Office provides pursuant to § 24 paragraph 4 and § 28a paragraph 1 of Act No. 61 / 1988 Coll., on Mining Activities, Explosives and on State Mining Administration, as amended by Act No. 315 / 2001 Coll.:
1. Paragraph 1 (1) reads as follows:
"(1) The Decree lays down more detailed conditions for the placing on the market of explosive articles and aids, as well as conditions for their checking, methods for verifying essential requirements for the safety of explosives, unless they are laid down by harmonised Czech technical standards, and the detailed conditions and characteristics of explosives which may be used in or under risk conditions, and checks on the characteristics of such explosives. ';
2. the following Sections 2a and 2b are inserted after Section 2, including the title and footnotes 2), 3), 4), 5), 6), 7), 8) and 9):
Use of explosives in risk and risk conditions, closer conditions and checking
(1) A closer condition for the first use of an individual type of explosive under risk conditions or in a risk environment is compliance with the requirements set out in Annexes 1, 2 and 3.
(2) Authorisation for the first use of an individual type of explosive in a risk environment or in a risk condition2) may be issued after the manufacturer or importer (the applicant) has submitted to the Czech Mining Authority:
(a) evidence of conformity assessment with the essential safety requirements, 3)
(b) a technical dossier containing instructions for the use of the explosive, which shall include the particulars listed in Annex 1, the draft technical requirements, the basic technical parameters identifying the explosive and its qualitative characteristics; the technical requirements shall contain the information set out in Annex 2.
(3) The Czech Mining Authority shall examine the documentation referred to in paragraph 2 and, where appropriate, determine the scope of the additional official tests which can only be carried out by a person authorised to carry out conformity assessment activities in respect of explosives under a specific legislative regulation.4)
(4) The applicant shall provide the Czech Mining Authority with evidence of the conduct and results of any additional official tests, indicating whether the type of explosives meets the conditions laid down by specific legislation, 5) or harmonised Czech technical standards to ensure safety and health at work and safety of operations.
(5) The costs of taking samples of explosives for additional official tests and carrying out such tests shall be borne by the applicant.
More detailed conditions for the placing on the market of explosive articles and aids
(1) Only explosive articles may be placed on the market, (6) which have been verified by the Czech Office for the Testing of Weapons and Weapons, (7) that they comply with the requirements set out in Annexes 1, 2 and 3. The Czech Office for the Testing of Weapons and Ammunition will inform the Czech Mining Office and the person who requested the verification.
(2) Only aids may be placed on the market, (8) which have been verified by a person authorised to carry out conformity assessment activities in respect of explosives under a specific legislation, (9) that they comply with the requirements set out in Annexes 1, 2 and 3. The person authorised to carry out conformity assessment activities in respect of explosives under specific legislation shall inform the Czech Mining Authority and the person who requested verification of the result of the verification.
(3) Verification of the requirements for explosive articles and aids is requested and the costs of such verification are borne by whoever intends to place them on the market.
2) Article 28a (2) of Act No. 61 / 1988 Coll., on Mining Activities, Explosives and on State Mining Administration, as amended by Act No. 315 / 2001 Coll.
3) Article 12 (4) of Act No. 22 / 1997 Coll., on technical requirements for products and amending and supplementing certain laws, as amended by Act No. 71 / 2000 Coll.
4) § 11a of Act No. 22 / 1997 Coll., as amended by Act No. 71 / 2000 Coll. Government Decree No. 358 / 2001 Coll., laying down technical requirements for explosives for civil use when placed on the market.
5) For example Decree No. 72 / 1988 Coll., on the Use of Explosives, Decree No. 358 / 2001 Coll.
6) Paragraph 2 (1) (b) of Decree No 174 / 1992 Coll.
7) Article 17 of Act No. 156 / 2000 Coll., on the Verification of Firearms, Ammo and Pyrotechnic Articles and amending Act No. 288 / 1995 Coll., on Firearms and Ammo (Firearms Act), as amended by Act No. 13 / 1998 Coll., and Act No. 368 / 1992 Coll., on Administrative Charges, as amended.
8) Paragraph 21 (7) of Act No. 61 / 1988 Coll., as amended by Act No. 315 / 2001 Coll.
9) § 11a of Act No. 22 / 1997 Coll. Government Decree No. 358 / 2001 Coll. '
3. In Annex 2, the following Article 4a is inserted after Article 4:
Non-electric igniters
1. The appearance, dimensions and design of non-electric detonators shall comply with the technical documentation of the product.
The correct marking of the detonators themselves is checked visually. The marking of detonators shall be clearly legible and, in the case of detonators themselves, shall not be self-extinguishable or easily washed with water. The indelible marking of the detonators shall be checked under a flow of running water for 5 minutes.
The walls of the tubes shall be rigid, free from cracks and mechanical damage. Their circular shape shall not be grossly disturbed. The diameter and length of the tube of individual time stages and the length of detonation tubes shall be checked by approved gauges. The appearance and design of the tubes, their integrity and strangulation shall be checked visually, constructively and technically for the interior parts according to the drawing documentation provided and, where appropriate, delabored.
The detonation tubes shall be inspected visually. Detonation tubes shall form a solid, non-removable whole with a cavity, their walls shall be mechanically rigid, climate resistant and free of obvious signs of damage.
Inspection of the appearance, dimensions and design shall be carried out for one set of detonators, but at least 10 pieces of products.
2. Non-electrical igniters are required to be manipulatively safe.
Manipulative safety shall be verified in accordance with the Binding Procedure No 27 set out in Annex 3 to this Decree for 10 pieces of igniters at a coating frequency of 60 cycles. min-1 and drop height 150 mm. The initiation shall not take place during the stress period of 5 minutes.
After the handling safety test, samples shall be required to comply with the test requirement of paragraph 4.
3. The internal components of non-electrical detonators must be firmly stored in the tube.
The mechanical strength of the whole assembly shall be checked according to Obligatory Procedure 28 set out in Annex 3 to this Decree by a static method. The detonator tube and the assembly of the non-electric detonator shall be resistant to deterioration when loading detonators by pulling behind the detonator tube with a force of 40 N, operating for 120 seconds. It shall be monitored whether there is mechanical damage to the detonation tube (i.e. cracks with subsequent loss of explosive charge) or failure of the detonator assembly (extraction or release of the detonation tube from the stopper).
The functioning of the detonator after the mechanical strength test of the assembly shall be verified by the test described in paragraph 4 or 8. Those detonators which fail these tests or fail the prescribed lead plate penetration or delay test requirements shall be considered defective.
Unless otherwise specified in the Technical Regulation, probability P = 95% and p = 10% are selected.
4. It is essential that non-electrical ignitators have sufficient initiation power.
The initial force check shall be carried out in accordance with the Binding Procedure 26 set out in Annex 3 to this Decree with 10 samples. The non-electric detonator shall have a hole of the prescribed size in the plate of material (Pb or Fe) and thickness according to the technical requirement of the product, but not less than 5 mm. The burst diameter shall be in accordance with the technical requirement of the product, but not less than 7 mm.
5. The non-electrical igniters shall show sufficient water and shall have a proper function throughout the temperature range for which they are intended.
The waterworthiness shall be verified in accordance with Binding Procedure 31 set out in Annex 3 to this Decree, point 2 (a) or point 2 (b), on a single set, but not less than 10 pieces of detonators. The non-electric detonator, including the sealed ends of the detonation tubes, shall withstand the effect of the increased overpressure of water specified in the technical requirement of the product for at least 2 hours during the period specified in the technical requirement of the product. The non-electric detonator with the end of the detonation tubes located outside the pressure water shall withstand the effect of an increased pressure of 0,2 MPa during the period specified in the technical requirement of the product for at least 6 hours. After application of pressure water, the delay time test referred to in point 8 shall be carried out. The failure shall not occur during the delay test. Detonators which have failed to comply with the delay test conditions shall also be considered defective.
A total of 2 sets of non-electrical igniters, but at least 20 pieces, shall be subjected to stress tests at limit temperatures. The non-electric detonators shall be subjected to stress storage for 6 hours at limit temperatures according to the technical requirement of the product. The delay time test referred to in point 8 shall be performed immediately after stress. The failure shall not occur during the delay test. Detonators which have failed to comply with the delay test conditions shall also be considered defective.
Non-electric detonators designed for particularly difficult conditions shall not detonate at 100 ° C during 24-hour exposure.
6. Non-electric detonators fitted with a connector shall ensure a reliable initiation of the detonation tubes fitted to the connector in the prescribed manner.
In accordance with the technical requirement of the product, a specified number of detonating tubes of non-electric detonators (receivers) are inserted into the non-electric detonator connector (donor). The detonators with the shortest detonation tube length supplied shall be used as both Donor and Acceptor. The test shall be carried out at the current temperature of the test area. Donor initiation shall be carried out by an approved detonator or other equally reliable device. The initiation of the secondary charge of the Donor shall give rise to a reliable function of all connected receivers. No defect is permitted. The test shall be carried out with 10 Donors.
Non-electric detonators intended for particularly difficult conditions shall be pre-loaded in water before testing.
7. Non-electrical igniters shall have sufficient resistance to spark initiation.
The immunity of non-electric spark-ignition detonators shall be verified in accordance with Binding Procedure No 35 set out in Annex 3 to this Decree. Capacity of the test capacitor is 500 pF, test voltage is 20 kV. A brass cone electrode with a base diameter of 6 mm and a length of 6 mm, and a non-electric detonator tube on clamp 2 is attached to clamp 1 of the test apparatus of this procedure. The detonators shall be tested with the shortest detonation tube length supplied. The closed end of the tube shall be removed before the test so that its explosive charge can come into contact with the electrode connected to clamp 1. Resistance R2 will be disabled. The capacitor size C = 500 pF is set with tolerance ± 50 pF, voltage size U = 20 kV with tolerance ± 1 kV. After charging the capacitor C, whose voltage is measured by the electrostatic voltmeter V, and switching the P switch to terminal 1, the end of the detonator tube approaches the cone electrode tip when the explosive charge of the tube contacts the electrode body. This procedure is repeated 10 times with a frequency of 1 discharge / s No detonation tubes or detonators shall be initiated or detonated. Unless otherwise specified in the Technical Regulation, probability P = 95% and p = 10% are selected.
The AC resistance test shall be carried out on the same test equipment as the spark-discharge resistance test, except that, instead of a DC U, the AC supply connected directly to terminals 1 and 2 via R1 resistance shall be used (P switch is disabled as well as capacitor C). The cut end of the detonator tube of the non-electric detonator shall be close to the cone electrode tip by contact with the explosive charge of the tube with the electrode body and this contact shall be maintained for 1 minute. The detonation tube or detonator shall not be initiated even in such stress. The test voltage U = 1 kV 50 Hz is maintained to ± 50 V. Unless otherwise specified in the Technical Regulation, probability P = 95% and p = 10% are selected.
8. It is essential that the delay times of the time detonators are uniform enough to avoid overlapping the delay periods of adjacent time levels.
The delay period shall be tested in accordance with the Binding Procedure No 36 set out in Annex 3 to this Decree. Unless otherwise stated in the technical requirement of the non-electric detonator, detonators with a detonation tube length of 4 m shall be tested. The closed end of the tube of the test detonator shall be removed and the tube shall be equipped with a photoelectric sensor at a distance of 5 cm from the end. The START signal from the photoelectric sensor, located on the detonation tube and the STOP signal from the exploding box photo sensor, is brought to the inputs of the recording device (e.g. counter, digital memory oscilloscope). A total of 20 pieces of detonators shall be tested from each time stage. The sampling mean and the sampling standard deviation with individual time steps shall meet the condition of the receiving triangle.
s ≤ I-2xN-x22
Inequality applies to non-electric detonators whose interval number I is constant for all or at least part of the time levels. For other types, the limit permissible sizes shall be specified in the technical requirement of the product. ';
4. In Annex 3, points 55 to 58 are added to the list of binding procedures:
'55. Safety test of electrical igniters against the smallest currents
56. Determination of water content in industrial explosives
57. Methods of chemical testing of industrial explosives
58. Calculation of the main explosive characteristics of industrial explosives'.
5. The following shall be added to the end of Annex 3:
"Obligatory procedure 55
Electrical igniter safety test against the smallest currents
Test substance
1. The test shall determine the limits of the insensitivity of the electrical igniter to the electrical current by extrapolating the achieved results of the ignition frequency at different electrical current values by the graphic method.
2. The result of the test is the determination of the DC value with sufficient flow time at which 99,99% is likely to be found not to initiate the electric igniter of the test type.
Meaning of test
3. According to the test result, the practical use of the electric igniter type tested is decided.
Test equipment
4. The test apparatus consists of a DC power supply (at the power supply supplied from the network, the alternating voltage component at the outlet without load shall not exceed 5 per cent of the rated voltage and shall not be changed during the measurement), two variable resistors, an ampermeter (Class 1,5), resistance measuring instruments and four-position switches.
Engaging scheme
B is the direct current source
R1 R2 variable resistors
And an ampermeter
P switch
M Wheatstone Bridge modified so that in any position of the switch the current does not pass through the measured resistance greater than 20 mA
r test igniter
Selection of test samples
5. The electric pills of the types used are to be tested.
Electrical pills of the lowest and highest resistance groups of the total resistance range considered by the manufacturer for deliveries are used for the test. For tests it is necessary from each selected group of 250 pieces of electric pills, to check the lower limit of 50 pieces of pills. Each of the selected resistance groups shall be tested and evaluated separately.
Note: The resistance difference for pills of one delivery is meant by a degraded group (defined by the product quality standard). If the manufacturer guarantees that only one resistance group will be used for all deliveries, only this group shall be tested.
Test conditions
6. Unless otherwise prescribed in the product quality standard, it shall be tested at normal temperature, i.e. 15 to 25 ° C.
The test shall comply with the safety regulations for explosive tests.
Test procedure
7. Electric pills must be tempered for 2 hours at normal laboratory temperature, unless otherwise prescribed in the product quality standard.
After attaching the electric pill to the test apparatus, the circuit resistance shall be measured in the basic position of the switch. After switching the switch to position 2, the value of the circuit resistance obtained shall be adjusted to the variable R2 resistance (so-called replacement resistance). When the switch is switched to position 3, the required DC value shall be adjusted by means of the integrated ampermeter and the variable resistance R1 on the replacement resistance R2. By switching the switch to position 4 with direct current, this setting will load the electric pills.
The stress current values (Iz) shall be selected in such a way that the ignition frequency at one electric current value is within the range 0 to 10%, three different electric current values give the ignition frequency within the range 10 to 90%, and one electric current value provides the ignition frequency within the range 90 to 100%.
Thus, 5 different values of stress current shall be used in the test and 50 pieces of electric pills shall be tested for each value.
8. The ignition frequency in% (S) at the selected electric current value is calculated from the formula:
S = a50 / 100,
where and is the number of initiated pills.
9. The electric pill can only be charged once. The time of flow of electricity through the bridge pill must be chosen so that its further prolongation does not affect the test result.
That period is fixed in the quality standard for the product in question.
10. Results representing 0% or 100% of the ignition frequency shall not be counted in the test (Article 7) and shall be repeated at an increased or reduced electrical current.
Test evaluation
11. A graphical assessment of the test shall be made on the diagram where the calculated value of the firing frequency in% and the axis of the co-ordinates (X) with the linear scale shall be obtained by the test value of the electrical current on the order axis (Y) with the probability scale of the normal (Gauss) distribution.
The point A = 0,01%, point B = 99,99%, shall be intersected by the points on which the points for the firing frequency are marked.
12. From the intersection A (0,01% of the ignition frequency), the value of the electric current (Iz0) is calculated from the graph at which 99.99% is still likely to ensure safety against ignition.
The test results shall be evaluated separately for each resistance group of pills.
13. In those cases where the line interpolation would not be accurate due to the distribution of points in the graph, or the determined value of IZ0 is the subject of a dispute, the lower limit of sensitivity of electrical igniters to the electrical current value prescribed in the quality standard of the product under test shall be checked.
50 pieces of electrical igniters shall be tested and charged with electricity individually or more pieces involved in the series at one time. The time of loading of the electric current is 5 minutes, each igniter may be loaded with the test electric current only once. The igniter shall not be ignited during the test.
Test entry
14. The test report shall include:
(a) description and labelling of the product (electric pills), date of manufacture, number of samples taken and tested, reason for testing;
(b) details of the test equipment used and the test method;
(c) temperature and humidity of the test area;
(d) the date of the test;
(e) the result of the test.
Obligatory procedure 56
Determination of water content in industrial explosives
General
1. The method of determination shall be chosen according to the chemical composition of the explosives. The determination of the water content by drying is used for those explosives which do not contain volatile substances (especially liquid nitric acid esters). The K. Fischer methods are used to determine the water content up to 5% for all explosives whose components do not react with the Fischer reagent.
2. The safety rules for explosive tests shall be complied with when determining.
A. DETERMINATION OF WATER BY DRUGS
3. The explosive sample shall be dried in the oven under prescribed conditions up to a constant mass.
(a) Test procedure. Weigh 10 g of the sample into a weight of 80 mm with an accuracy of 0,2 mg and spread to a uniform layer. The sample shall be dried at a temperature (60 ± 2) ° C in a oven complying with the safety regulations to a constant weight (unless two consecutive weighing of more than 1 mg is different). After cooling in the desiccator it weighs.
(b) Calculation. The water content in% (x) is calculated using the formula:
x = a-b.100a
where and is the sample in g,
b mass of the residue after drying in g.
Two parallel determinations shall not differ by more than 0,1% for loose explosives, or by more than 0,3% for others. The average of both determinations is rounded to a tenth of a percent.
B. DETERMINATION OF THE WATER OF METHOD K. FISCHER
4. This is done by adding 50 ml of a mixture of anhydrous methanol and pyridine with a ratio of 1 + 1 to the sample. The average of the two determinations is rounded to a tenth of a percent.
Test record
5. The test record shall contain the following information:
(a) the marking of the sample;
(b) date of manufacture of the explosive;
(c) the date of the test;
(d) method used;
(e) the result of the tests.
Obligatory procedure 57
Chemical testing methods for industrial explosives
I. GENERAL
1. Industrial explosives are explosives and therefore, when working and handling them, the safety and technical regulations issued by the competent authorities must be strictly respected. When certain types of industrial explosives are classified as harmful substances, they must also comply with the health regulations.
II. TEST
2. The methods set out in this Decree shall determine the chemical composition given by the manufacturer in the industrial explosive material sheet.
3. The test is used - unless otherwise specified - by the chemical purity p. a. (for organic solvents anhydrous) and distilled water. If no change is noted, it shall be weighed on the analytical balance to an accuracy of 0,2 mg.
4. Unless otherwise specified, the sample weight for bulk explosives is 5 g, for explosives containing liquid nitric acid esters and containing nitrocellulose is 10 g. Samples prior to testing shall be treated by dilution (bulk explosives) or by cutting into cubes of about 0,25 cm3 (plastic and semi-plastic explosives). The arithmetic mean of the two concurrent determinations shall be reported as the result of the test.
5. Metod under this procedure is used for both "shortened analyses" and "complete and arbitration analyses." The term "abbreviated analysis" means analytical procedures designed to rapidly control production technology and to rapidly determine the total contents of components that carry explosive properties. The abbreviated analysis procedures are set out in paragraphs 7, 9, 16, 23, 24 and 25.
6. Table 1 gives an overview of the individual test methods.
Tab. 1.
| Zkušební postup pro trhaviny | Čl. | ||
|---|---|---|---|
| Trhaviny | na bázi ledků | Stanovení obsahu látek extrahovatelných organickým rozpouštědlem | 7 |
| Stanovení obsahu kapalných esterů kyseliny dusičné, obsahu nitrolátek a obsahu maziv vedle sebe | 8 | ||
| Stanovení obsahu látek rozpustných ve vodě | 9 | ||
| Stanovení obsahu dusičnanu amonného | 10 | ||
| Stanovení obsahu dusičnanu amonného a dusičnanu sodného vedle sebe | 11 | ||
| Stanovení obsahu dusičnanu amonného a dusičnanu vápenatého vedle sebe | 12 | ||
| Stanovení obsahu dusičnanu amonného a chloridu sodného vedle sebe | 13 | ||
| Stanovení obsahu dusičnanu amonného, dusičnanu vápenatého a chloridu sodného vedle sebe | 14 | ||
| Stanovení obsahu dusičnanu amonného a chloridu amonného vedle sebe | 15 | ||
| Stanovení obsahu látek nerozpustných v organickém rozpouštědle a ve vodě | 16 | ||
| Stanovení obsahu hliníku | 17 | ||
| Stanovení obsahu nitrocelulózy | 18 | ||
| Stanovení obsahu látek rozpustných v kyselině chlorovodíkové | 19 | ||
| Stanovení obsahu dřevěné moučky | 20 | ||
| Stanovení celkového obsahu kysličníku křemičitého, mastku, síranu barnatého, event. anorganického barviva | 21 | ||
| Stanovení obsahu stearanu zinečnatého | 22 | ||
| na bázi pentritu | Stanovení obsahu pentritu | 23 | |
| Stanovení obsahu látek rozpustných ve vodě | 24 | ||
| Stanovení obsahu hydrouhličitanu sodného | 25 | ||
| Stanovení obsahu látek nerozpustných v organickém rozpouštědle a ve vodě | 26 | ||
| Stanovení obsahu síranu barnatého | 27 | ||
| Stanovení obsahu ocelového prášku | 28 | ||
| Stanovení obsahu změkčovadla nebo plastického pojidla | 29 | ||
Determination of the organic solvent extractable content
7. The content of the organic solvent extractable substances (hereinafter referred to as the extract) shall be determined by weight. The method of determination shall be chosen according to the purpose of the test and the chemical composition of the explosive. For complete arbitration analyses, procedures A, B, E and F are used, for shortened analyses of procedures C and D; procedures A and C are intended for explosives containing liquid nitric acid esters and containing nitrocellulose, procedures B and D are used for other explosives, i.e. without nitric acid esters and nitrocellulose esters, containing organic nitrites, process E is used for explosives of the type DAP containing technical ammonium nitrate with water-soluble and insoluble calcium salts and organic fuel.
Note: Progress A is also used for explosives containing organic nitrites and water up to 10% plasticiser; for liquid explosives of this type with a water content exceeding 10%, the procedure laid down in Article 7F shall be followed.
A. The sample is extracted under prescribed conditions by diethylether (hereinafter referred to as ether).
(a) Chemicals
Ether
(b) Test procedure. Weigh 10 g of the sample on the paper filter, wrap it in the filter and insert the frosting into the glass extraction liner of the rapid extractor. Measure 150 ml of ether in the high-speed extractor flask, pre-dried and weighed, assemble the apparatus (Figure 1) and extract the sample for 16 hours. After completion of the extraction, almost all aether is distilled from the flask, the residue is removed by suction of air from the flask, the flask with the remainder is dried in the desiccator over sulphuric acid (h = 1,84) and weighed to constant weight after 24 hours.
(b) Calculation. The extract content in% (x) is calculated using the formula:
x = 100.ba,
where and is the sample in g,
b mass of the sample after extraction of ether in g.
B. The sample is extracted under prescribed conditions by ether. *)
(a) Chemicals
Ether
(b) Test procedure. Weigh 5 g of the sample into a pre-dried and weighed S2 filter cup with a paper filter insert, load it freely with a sintered glass filter * *) of suitable size and place the cup into a high-speed extractor on a metal pad with circular holes. Measure 150 ml of ether in the high-speed extractor flask, pre-dried and weighed, assemble the apparatus (Figure 2) and extract the sample for 16 hours. After completion of the extraction, almost all aether is distilled from the flask, the residue is removed by suction of air from the flask, the flask with the remainder is dried in the desiccator over sulphuric acid (h = 1,84) and weighed to constant weight after 24 hours.
Fig. 1. Speed extractor
(diagram of installation of apparatus for extraction in accordance with the procedure referred to in Article 7A)
(c) Calculation. The extract content in% (x) is calculated using the formula:
x = 100.ba,
where and is the sample in g,
b the mass of the sample after éter extraction in g.
C. The sample is extracted by washing toluene.
(a) Chemicals
Toluene
(b) Test procedure. Weigh 10 g of the sample into a pre-dried and weighed cup of S3 type, in parts and wash a total of 200 ml of toluene with a slight vacuum, with occasional mixing of the sample with a glass rod. *) The crucible with the rest is dried for 3 hours at 65 ° C and weighed after cooling in the desiccator.
Fig. 2 Speed extractor
(diagram of assembly of apparatus for extraction in accordance with the procedure referred to in Article 7B)
(c) Calculation. The extractor content in% (x) is calculated using the formula:
x = a-b.100a,
where and is the sample in g,
b mass of the sample after washing with toluene in g.
D. The sample is extracted by washing with benzene or carbon chloride.
(a) Chemicals
Benzene
Carbon chloride
(b) Test procedure. Weigh 5 g of the sample into a pre-dried and weighed paper filter (white or black tape) ready for filtration on the funnel, place the filter in a funnel at a height and wash in pieces a total of 200 ml of benzene or carbon chloride (if paraffinic lubricants are present). The filter with the rest is dried for 3 hours at 65 ° C and weighed after cooling in the desiccator.
(c) Calculation. The extract content in% (x) is calculated using the formula:
x = a-b.100a,
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Regulation Information
| Citation | Decree of the Czech Mining Office No. 60 / 2002 Coll., amending Decree of the Czech Mining Office No. 246 / 1996 Coll., laying down more detailed conditions for the authorisation and checking of explosives, explosive articles and devices for circulation |
|---|---|
| Regulation Type | Order |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 22.02.2002 |
|---|---|
| Effective from | 01.03.2002 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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