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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance
2 l4 ?! a2 j) W# W( W0 \4 o# fwith the criteria given below.
$ o' K8 J$ ?' ]7 E. I0 u8.4.1 A material classified HB shall conform to one of the following criteria:
! e( k" l3 g0 W; x9 Z, }a) it shall not visibly burn with a flame after the ignition source is removed;
* x; L6 o! n8 o4 Wb) if the test specimens continue to burn with a flame after removal of the ignition source, the
, @* R8 i( M7 G Q1 F7 c. Vflame front shall not pass the 100 mm mark;% H$ u$ K# l6 t }. @
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding" _% X, J4 f$ o6 i4 T! ~* Q) T
40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding
, J: p9 P# j) k% ]75 mm/min for a thickness of less than 3,0 mm;
: i i( ?" f" g- a n1 l1 u- Ad) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm
: G8 x8 x+ y0 z. kthickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.
' p8 G# ?7 J* t3 V' ~8 s) E8.4.2 A material classified HB40 shall present one of the following criteria:
! ]2 Z, p8 b, |; m: H4 C2 Ta) it shall not visibly burn with a flame after the ignition source is removed;
& g" g/ L+ b/ x5 b M+ xb) if the test specimens continue to burn with a flame after removal of the ignition source, it
! ~* O3 S6 w. M& wshall not have the flame front pass the 100 mm mark;
( |" E/ Y9 t& Q# l; n9 Ac) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
9 Y' E- ~ X6 L$ m3 R: g" u9 N40 mm/min.+ L. t5 N0 |8 f; T
8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if
% X v+ H: H6 S+ \" ^6 O' o7 u/ n5 nthe flame front passes the 100 mm mark.
3 B" H, j; R3 r5 L3 J) a2 P# J7 Z8 L楼上的,看完上面的英文,你就知道了。 |
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