Filed Under (Plywood, Quality & Markets) by Mason Pan on March-21-2015

F4 plywoodWhat is F4 plywood (F Four-star Plywood) ?

F4 means F☆☆☆☆ or F 4-star or F Four-star, which is the top Formaldehyde Emission grade for plywood, fiberboard, MDF, OSB, HDF, wood furniture and other wooden products according to Japanese standard JIS A 1460 (2005) Building Boards Determination of formaldehyde emission – Desicator method .

JIS A 1460 (2005) is a part of JAS (Japanese Agricultural Standard) which is published by Ministry of Agriculture, Forestry and Fisheries (MAFF Japan) .

JIS A 1460 (2005) sets four grades for Formaldehyde Emission value . F☆☆☆☆ is the highest Formaldehyde Emission grade according to JIS A 1460 (2005) . F4 plywood means the plywood can meet the F☆☆☆☆ grades of Formaldehyde Emission according to JIS A 1460 (2005) . F4 plywood is the lowest Formaldehyde Emission plywood which can be used interior without limitation .

JAS Formaldehyde Emission grades: Grades (Rating)   Average Value          Max. Value F☆☆☆☆                  0.3mg/L                   0.4mg/L
F☆☆☆                      0.5mg/L                   0.7mg/L
F☆☆                          1.5mg/L                   2.1mg/L
F☆                              5.0mg/L                   7.0mg/L
Note: These values are achieved through Desiccator Test .

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