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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance! d7 j5 m7 Q, o& U
with the criteria given below.
. M7 ]8 R+ b( |8 e8.4.1 A material classified HB shall conform to one of the following criteria:
) i( H& ?, b2 g a, d2 ea) it shall not visibly burn with a flame after the ignition source is removed;
. W6 h+ u, h2 ^9 P7 u6 \b) if the test specimens continue to burn with a flame after removal of the ignition source, the
6 d7 D, [! L9 s9 e0 F: H: w9 Fflame front shall not pass the 100 mm mark;: y3 o4 d1 ?7 G" U7 X) q% u
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
" }' R: F' r! M" G x" p' X40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding
0 J8 @8 c; U& F( Z+ D* ~2 x75 mm/min for a thickness of less than 3,0 mm;- f* H" s2 A+ i! P. F4 M) h9 T. H8 A
d) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm* k* i" K. K1 B% Q+ {
thickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.
' ~3 ~; z8 I/ o" {8.4.2 A material classified HB40 shall present one of the following criteria:
; X+ b; a. m0 ?) Ia) it shall not visibly burn with a flame after the ignition source is removed;' [/ \" L) n$ } H, M9 d% z
b) if the test specimens continue to burn with a flame after removal of the ignition source, it# C: T2 h2 y2 m! v
shall not have the flame front pass the 100 mm mark;
5 ~0 n/ w5 v* |- Cc) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
' ]0 g( h7 K8 |- S40 mm/min.
, B% |/ f8 y7 E2 v( Q" W8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if: u) O9 m; N: M" J0 W
the flame front passes the 100 mm mark.
* Z, ^3 q1 r7 r& F( f; e楼上的,看完上面的英文,你就知道了。 |
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