BS 4978:1988被替代
Specification for softwood grades for structural use
出版：British Standards Institution
專家解讀視頻
Specifies 2 methods of grading softwood namely, visual and machine stress grading . Permissible limits of characteristics for: (a) 2 visual stress grades - General Structural (GS) and Special Structural (SS); (b) 3 laminating grades - LA, LB and LC. Requirements for machine stress grades; Machine General Structural (MGS), Machine Special Structural (MSS), M50 and M75 and Strength Classes are specified. Also includes performance requirements for machines which grade softwood.
? British Standards Institution 2013
Amendment notes:
AMD 6400 published 28 June 1991
AMD 6915 published 24 December 1991
AMD 8449
ISO 1030:1975 - Similar
ISO 2299:1973 - Similar
ISO 2300:1973 - Similar
ISO 2301:1973 - Similar
