MT 113-1995 English PDF (MT113-1995)

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MT 113-1995: General Test Methods and Judgment Rules for Fire-resistant Antistatic Properties of Polymer Products for Coal Mines
MT 113-1995
MT
COAL INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Replacing MT 113-85
General Test Methods and Judgment Rules for Fire-
resistant Antistatic Properties of Polymer Products for
Coal Mines
ISSUED ON: FEBRUARY 06, 1996
IMPLEMENTED ON: MARCH 01, 1996
Issued by: Ministry of Coal Industry of the People’s Republic of China
Table of Contents
1 Subject content and scope of application ... 3 
2 Normative references ... 3 
3 Terms ... 3 
4 Fire-resistant properties test methods ... 3 
5 Surface resistance test methods ... 8 
6 Judgment rules ... 11 
7 Inspection and sampling requirements ... 12 
Additional information: ... 13 
General Test Methods and Judgment Rules for Fire-
resistant Antistatic Properties of Polymer Products for
Coal Mines
1 Subject content and scope of application
This Standard specifies the fire-resistant properties, surface resistance test
methods, judgment rules, and inspection and sampling requirements of polymer
products.
This Standard applies to polymer products that can cause prolonged
combustion and static sparks in coal mines.
2 Normative references
MT 182, Alcohol blast burner structure and technical requirements
3 Terms
3.1 Fire-resistant properties
It refers to the ability of polymer products to pass the following tests:
a. After the alcohol blast burner combustion test, the test piece shall be
completely non-flammable or self-extinguishing;
b. After the alcohol lamp combustion test, the test piece shall be completely
non-flammable or self-extinguishing.
3.2 The length flame spread
The length of the charred part of the test piece after the flame combustion and
flameless combustion of the test piece are extinguished.
4 Fire-resistant properties test methods
4.1 Alcohol blast burner combustion test method
4.1.1 Test piece
combustion time and flameless combustion time of the test piece and drippings
from this time on.
4.1.4 Result expression
The following test results shall be recorded and calculated:
4.1.4.1 The unit value of the flame combustion time and flameless combustion
time of each test piece and drippings;
4.1.4.2 The length flame spread of each test piece;
4.1.4.3 The arithmetic mean of the flame combustion time of 6 test pieces and
drippings;
4.1.4.4 The arithmetic mean of the flameless combustion time of 6 test pieces
and drippings.
4.2 Alcohol lamp combustion test method
4.2.1 Test piece
Cut 6 test pieces from the sample, each of which is 360 mm long, 50 mm wide,
and 5 ~ 10 mm thick.
4.2.2 Instruments and apparatuses
a. Alcohol lamp: The capacity is 250 mL; the alcohol capacity in the lamp during
the test shall be half of the specified capacity. The fuel used is a mixture (V/V)
of 95% ethanol (GB 394) and 5% methanol (GB 338).
b. Combustion test chamber: see 4.1.2.b.
c. Test device: see Figure 3.
4.2.3.7 During the test, put the test piece in a flame and ignite the test piece.
The time to ignite the test piece is related to the thickness, softness and
hardness of the test piece. The ignition time is 5 ~ 90 s (subject to the
combustion test piece). Remove the unextinguished alcohol lamp; use a
stopwatch to measure the flame combustion time and flameless combustion
time of the test piece and drippings from then on.
4.2.4 Result expression
The following test results shall be recorded and calculated:
a. The unit value of the flame combustion time and flameless combustion time
of each test piece and drippings;
b. The length flame spread of each test piece;
c. The arithmetic mean of the flame combustion time of 6 test pieces and
drippings;
d. The arithmetic mean of the flameless combustion time of 6 test pieces and
drippings.
5 Surface resistance test methods
5.1 Test piece
5.1.1 Cut 3 test pieces from the sample; the size shall not be less than 300 mm
× 300 mm, and the thickness shall be 5 ~ 10 mm.
5.1.2 The test piece shall be smooth and free of defects such as cracks, bubbles
and mechanical impurities.
5.1.3 After using a clean cotton cloth dipped in distilled water to clean the test
piece, use a clean dry cloth to wipe the test piece dry, and place it in a dry place
for more than 24 hours.
5.1.4 On the surface of the clean test piece, use conducting resin (liquid) to
paint the area as shown in Figure 4, the size of which is equivalent to the size
of the electrode base surface.
b. The arithmetic average of the 3 surface resistances on the upper surface;
c. The arithmetic average of the 3 surface resistances on the bottom surface.
6 Judgment rules
6.1 Fire-resistant properties
6.1.1 Alcohol blast burner combustion test method
When testing according to the methods described in this Standard, the following
requirements shall be met:
a. After removing the blast burner, the arithmetic mean of the flame combustion
time of 6 test pieces shall not exceed 3 s, and the unit value of the flame
combustion time of each test piece shall not exceed 10 s.
b. After removing the blast burner, the arithmetic mean of the flameless
combustion time of 6 test pieces shall not exceed 10 s, and the unit value of the
flameless combustion time of each test piece shall not exceed 30 s.
c. The length flame spread of the combustion test piece shall not be greater
than 280 mm.
If one of the 6 test pieces does not meet the above requirements, take double
the amount of test pieces to retest. If it still does not meet the above
requirements, judge the test as unqualified.
6.1.2 Alcohol lamp combustion test method
When testing according to the methods described in this Standard, the following
requirements shall be met:
a. After removing the alcohol lamp, the arithmetic mean of the flame combustion
time of 6 test pieces shall not exceed 6 s, and the unit value of the flame
combustion time of each test piece shall not exceed 12 s.
b. After removing the alcohol lamp, the arithmetic mean of the flameless
combustion time of 6 test pieces shall not exceed 20 s, and the unit value of the
flameless combustion time of each test piece shall not exceed 60 s.
c. The length flame spread of the combustion test piece shall not be greater
than 250 mm.
If one of the 6 test pieces does not meet the above requirements, take double
the amount of test pieces to retest. If it still does not meet the above
requirements, judge the test as unqualified.