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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance
( d9 u, `4 C- N& f( j) e* H" ]with the criteria given below.
% W% v" D: R% ]& `9 ~/ G3 k, N8.4.1 A material classified HB shall conform to one of the following criteria:
8 u p2 r. L) A- L* c/ F# P ha) it shall not visibly burn with a flame after the ignition source is removed;9 s2 d( L4 m) {+ V$ A ] [
b) if the test specimens continue to burn with a flame after removal of the ignition source, the
! a* |; C9 b% s) V( @5 `" Tflame front shall not pass the 100 mm mark;6 o0 R( H. _( o Q
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
: A' [9 d! j$ q40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding
0 [6 A4 E- q1 S" J6 e8 ]75 mm/min for a thickness of less than 3,0 mm;' q9 {+ D, K; r o% z) F9 o4 s
d) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm
) x- X$ E6 s3 Xthickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.4 ~) W, q3 A% M6 T
8.4.2 A material classified HB40 shall present one of the following criteria:1 Y; i0 j; p6 b4 j8 S- _6 r6 v0 Z
a) it shall not visibly burn with a flame after the ignition source is removed;
) t9 R+ S! m& s- i# ^b) if the test specimens continue to burn with a flame after removal of the ignition source, it" H- |9 j: J# o$ Y# A& n7 |
shall not have the flame front pass the 100 mm mark;. i7 {' S4 {; a3 h
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
) O q; J# ?3 l! R+ a# `: J40 mm/min.% L$ N7 X& c4 `% w ^1 ~) O
8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if5 _3 m3 ^$ I2 D/ S9 M+ C5 V
the flame front passes the 100 mm mark.$ e& b A4 U' u3 a0 o% K! d
楼上的,看完上面的英文,你就知道了。 |
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