|1994||The conventional 5 published speciﬁcations for gypsum boards are integrated as JIS A 6901 Gypsum Board. Sound deadening gypsum board with pores (GB-P) was subsumed within the JIS A 6301 Sound Absorbing Materials.|
|1997||In order to make JIS A 6901 Gypsum Board conform to the global International Quality Standards, aimed to align with ISO 6308:01908 (Gypsum Plaster board-Speciﬁcation). The former non-combustible gypsum laminated board is added as a JIS Certiﬁed product, non-combustible laminated gypsum board (GB-NC).|
Hard gypsum board (GB-*-H), moisture absorption-desorption gypsum board (GB-*-Hc), structural gypsum board (GB-St) were added to the JIS A 6901 Gypsum Board.
Note) The letters R, S, or D is inserted in place of asterisk depending on the type of gypsum board.
|2014||To improve the reliability of fire performance, the lower limit for "thickness" has been raised, also "mass per unit area" and "specific gravity" has been normalized by the Ministry of Land, Infrastructure and Transport.|
|Gypsum Board||GB-R||Standard gypsum board.|
|Gypsum Sheathing Board||GB-S||Featuring water repellant paper facings and core.|
|Reinforced Gypsum Board||GB-F||GB-R with inorganic ﬁber mixed into the core.|
|Gypsum Lath Board||GB-L||GB-R with oblong pores on the surface.|
|Decorated Gypsum Board||GB-D||GB-R with decorated surface.|
|Non-combustible Laminated Gypsum Board||GB-NC||GB with non-combustible face paper. or boards with decoration.|
|Non-combustible Laminated Gypsum Board||GB-P||A sound absorbing material speciﬁed by JIS A 6301.|
|Regular Hard-type Gypsum Board||GB-R-H||Gypsum boards with about 1.2 times or higher impact resistance than GB-F and about 1.3 times or higher ﬂexural fracture load than GB-R.|
|Humidity Controlling Gypsum Board||GB-R-Hc
|Gypsum boards that have an equivalent performance to GB-R and GB-D but have enhanced moisture absorption and desorption performances.|
|Structural Gypsum Board||A Type||GB-St-A||Gypsum boards that have an equivalent performance to GB-F but have enhanced lateral nail resistance, which will be the standard for categorizing Type A and Type B.|