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3、L ISO 679 , 1.2 mm . 1 1) KS D 3503 SS400 . KS F 2221:2009 3 b) () 1 ( ) KS F 2221:2009 4 c) () 1 ( ) b) , 3 . KS F 2221:2009 5 3 g mm W1500 500 42 W11 000 1 000 52 aW12 000 2 000 66 W2300 286 15/841 W2500 530 2 51 bW21 000 1 042 21/264 a 2 . R 3 1/2 , 3 . b KS B 2001 . 2 4.2 4.1 a) 2), 4.1 b) , . cm . 4.3 . a) b) c) d) ( ) e) f) ( ) g) 2) , . 153787 1 92 3 (13 ) (02)26240114 (02)262401489 http:/ KS F 2221:2009 KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Test method of impact for building boards ICS 91.060.10 Korean Agency for Technology and Standards http:/www.kats.go.kr
