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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance
+ L6 L1 ], [: Y+ K5 kwith the criteria given below.! \, e1 u& G3 Y
8.4.1 A material classified HB shall conform to one of the following criteria:: V& w6 A2 T+ j/ a
a) it shall not visibly burn with a flame after the ignition source is removed;
4 l8 N$ J3 z2 s8 c6 [3 z9 s) r: F2 Zb) if the test specimens continue to burn with a flame after removal of the ignition source, the& Y0 }" o4 e! Y- S3 g0 D( [0 \0 A+ M
flame front shall not pass the 100 mm mark;, p: |2 _$ `8 M) r. N% o1 X
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
. Z! k3 d: I& ?: a! |- G40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding
4 Z' U+ t* L8 Q- S. G75 mm/min for a thickness of less than 3,0 mm;* V, D, h2 W: W/ n% h$ |3 S1 b' A- Y( |
d) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm/ r( E$ J5 w& B& [' K6 r
thickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.
: U9 z* j( @8 u3 |5 b7 C* G8.4.2 A material classified HB40 shall present one of the following criteria:
v0 r `3 T! Ea) it shall not visibly burn with a flame after the ignition source is removed;4 C! I- ^6 w% Y
b) if the test specimens continue to burn with a flame after removal of the ignition source, it$ j/ e2 b h3 ~
shall not have the flame front pass the 100 mm mark;
& Z ~$ G1 w0 O& Q6 xc) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
7 Q4 s- \+ K# F40 mm/min.
1 n8 U# s7 K s* M8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if
+ i% K0 U% D% U J: _the flame front passes the 100 mm mark.& P0 A2 ~8 t9 X+ O* [
楼上的,看完上面的英文,你就知道了。 |
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