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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance
0 y' }5 d3 m8 U* X* ?with the criteria given below., U) _. ]2 B5 v3 o
8.4.1 A material classified HB shall conform to one of the following criteria:
! \/ |0 i: f3 m L; r8 H! N% Ua) it shall not visibly burn with a flame after the ignition source is removed;$ N: n, C6 o+ N+ a
b) if the test specimens continue to burn with a flame after removal of the ignition source, the7 p5 s/ x$ P+ K% i
flame front shall not pass the 100 mm mark;
+ B& s5 w, ^ r2 `3 @c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
. A$ {8 \* ^0 q; O40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding
0 E* @9 w4 \# }. X7 w75 mm/min for a thickness of less than 3,0 mm;8 z& W F- ^5 R- w
d) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm$ M/ }" i0 h/ L# ^* ^) \3 z
thickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.0 `( S3 W, q! u
8.4.2 A material classified HB40 shall present one of the following criteria:
0 [8 w( x# Q6 r0 Q0 t( T* ?a) it shall not visibly burn with a flame after the ignition source is removed;, J5 O: K- b s5 s$ D$ H R0 @% b
b) if the test specimens continue to burn with a flame after removal of the ignition source, it
: s3 Q( o0 W2 Z$ u; [! [4 n5 Ashall not have the flame front pass the 100 mm mark;
$ U4 q# A/ F& e, M+ Q$ R3 A: L3 r, _c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
8 C) f! u( c1 R# }7 [( x40 mm/min.6 Y8 i) ]5 R: [" J
8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if( R4 @0 F; b) J+ u5 D+ n
the flame front passes the 100 mm mark.7 S: ^, ^5 G1 F' k" {: C* J
楼上的，看完上面的英文，你就知道了。 |
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发表于 2007-11-26 20:51
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