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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance4 p6 b, y" |6 u6 V
with the criteria given below.: x: r# j" d, X5 k! s- [4 x
8.4.1 A material classified HB shall conform to one of the following criteria:1 J G' [* `+ P
a) it shall not visibly burn with a flame after the ignition source is removed;2 q& S2 p9 g c
b) if the test specimens continue to burn with a flame after removal of the ignition source, the2 _# w8 L8 p& l# j
flame front shall not pass the 100 mm mark;
, y9 o: B* V! V/ Sc) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
/ l3 k5 i/ u1 [% {, Z; u40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding, P& H7 x" p9 v9 x7 `0 x( S; b
75 mm/min for a thickness of less than 3,0 mm;
. C; T8 T# i0 \' i6 Zd) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm8 ?, C% h' E5 ~4 E
thickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.
; R% `# X, S6 c/ @8.4.2 A material classified HB40 shall present one of the following criteria:
- ?+ H: |5 T) ~# r( m3 ~a) it shall not visibly burn with a flame after the ignition source is removed;: o$ u5 I: w% G" H; C
b) if the test specimens continue to burn with a flame after removal of the ignition source, it
: a5 U6 u+ J0 i7 D) Yshall not have the flame front pass the 100 mm mark;
4 c, g, v5 \* p9 M7 c" d$ d Oc) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding4 d/ O+ ~& P' _) [$ J- [2 ?
40 mm/min.) }1 C* I: k9 }$ W2 k
8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if
8 U% \; U4 G& bthe flame front passes the 100 mm mark.
9 G3 q6 z9 ?+ }0 ~7 j楼上的,看完上面的英文,你就知道了。 |
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