配方类型:

MATERIALS OF CONSTRUCTION

配方说明:

Weatherproof Building Board (U.S. Patent 2,475,781)

配方组成:

Petroleum Asphalt/6.2
Powdered Limestone/60.5
Sodium Silicate/33.3

配制方法:

Mix well, apply between two liners, and heat to fusion.
This board is water proof and has a high thermal-insulation value.