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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance; t( t3 R% k+ }; } E0 u7 J& I5 r% T
with the criteria given below.+ W5 G7 R7 L8 o, m+ G
8.4.1 A material classified HB shall conform to one of the following criteria:
! Y( L: D& F; C% Z3 fa) it shall not visibly burn with a flame after the ignition source is removed;4 w0 I) q+ s# J, y
b) if the test specimens continue to burn with a flame after removal of the ignition source, the p* {! s" b0 r+ k$ V
flame front shall not pass the 100 mm mark;
5 ^/ X& h- B& f! T& S) N7 Kc) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
; P5 f9 m5 E I( i9 E1 o1 q$ }* @40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding
/ L) z) O" e3 b1 V75 mm/min for a thickness of less than 3,0 mm;7 _/ \- l$ j8 b
d) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm
. e) I9 t, x' [4 Y, S) A. G6 bthickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.
0 @0 d! e' p* h: m3 ^3 w( B! [8.4.2 A material classified HB40 shall present one of the following criteria:
h# u5 g& B4 ^ z0 Q6 ea) it shall not visibly burn with a flame after the ignition source is removed;
( Q: ^/ O. b# J9 o. J/ L: Mb) if the test specimens continue to burn with a flame after removal of the ignition source, it
/ w- I& |' u" ~. Eshall not have the flame front pass the 100 mm mark;% W* d! l. `# C1 i, z1 F
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding0 T' n% L) m0 j* d- Q7 r
40 mm/min.% Y1 R( k7 j+ D7 V
8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if
4 p9 p( U! f; s8 T& Cthe flame front passes the 100 mm mark.
# x: X& J8 L/ @; P8 p' i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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