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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance
) ~, o0 B& G# Y9 z% W1 ?& j" kwith the criteria given below.5 t. a3 g) f/ x& y. H
8.4.1 A material classified HB shall conform to one of the following criteria:" e6 B- ^/ A) q4 k8 N, {) ? ^# ?
a) it shall not visibly burn with a flame after the ignition source is removed;
+ B8 f1 x1 _7 ^7 D \1 k8 ^b) if the test specimens continue to burn with a flame after removal of the ignition source, the/ b7 y1 C/ u3 a; L' w5 Y$ k/ I8 {
flame front shall not pass the 100 mm mark;) l" B3 Q! i' _; k. m# ~5 o+ F4 o% M
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
. e. b% i8 q m+ |5 y40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding: Z* A y% l: a
75 mm/min for a thickness of less than 3,0 mm;0 Y$ J- v R0 ~4 R# Y/ S% c
d) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm
9 u* D5 U: W% \- h1 athickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.- a3 j, z5 P h. ^4 t
8.4.2 A material classified HB40 shall present one of the following criteria:4 K- N5 d0 u7 i- d+ f& w
a) it shall not visibly burn with a flame after the ignition source is removed;% r+ C% X; a2 F8 {4 r
b) if the test specimens continue to burn with a flame after removal of the ignition source, it0 M$ d0 Y5 @# U- p) u& y& i
shall not have the flame front pass the 100 mm mark;
) F+ t, N6 ~( E) _" `c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
5 r, i( g# ]8 b+ ^4 f40 mm/min.9 ] t8 p/ c) _3 x6 g- R: n
8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if
5 I3 a% B* u& ^; Q: t0 L5 q- D$ Ythe flame front passes the 100 mm mark.
. g" J5 a# {1 h) g+ g' d$ M楼上的,看完上面的英文,你就知道了。 |
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