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The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance
8 ^! D9 P9 i2 Twith the criteria given below.; m6 S9 |& X3 Y0 X4 {
8.4.1 A material classified HB shall conform to one of the following criteria:# D) Z2 q( W( k0 f6 U n
a) it shall not visibly burn with a flame after the ignition source is removed;
8 F# W. V5 t+ p4 ^b) if the test specimens continue to burn with a flame after removal of the ignition source, the. X9 l% K: U& w0 C" k1 H5 p0 Q
flame front shall not pass the 100 mm mark;/ f# p A! |( n9 B" L, N" R" q5 g0 F
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding3 i* ~, E( {8 B a: O. T
40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding
( _5 E- x* c$ s, M$ D" y6 N75 mm/min for a thickness of less than 3,0 mm; A0 q0 w# r8 { Y ]. ~
d) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm. e: }9 N) e7 w* ?
thickness, it shall automatically be accepted down to a 1,5 mm minimum thickness., ?! X1 \9 s: ^9 B% K) O8 J
8.4.2 A material classified HB40 shall present one of the following criteria:
, m5 r. W6 @, ?" x. o: Qa) it shall not visibly burn with a flame after the ignition source is removed;/ T9 B; C; p; z# n& \4 W& B
b) if the test specimens continue to burn with a flame after removal of the ignition source, it! C4 @7 h- b& B( ^5 F
shall not have the flame front pass the 100 mm mark;
% c Z7 @3 |! t1 z8 w5 U) f* u( }8 Yc) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding* ~9 `4 b% Q) q6 H9 s
40 mm/min.
( s' o8 Z S8 z+ _8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if0 U/ f8 P P4 \7 T. Z& E
the flame front passes the 100 mm mark.
% I& x0 y( d5 z! Z$ o楼上的,看完上面的英文,你就知道了。 |
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