| abstract |
[PROBLEMS] To provide a building material that is lightweight, excellent in workability and fire resistance, imparts high designability, and is suitable for exterior materials that do not contain asbestos. A building material that does not contain asbestos, has a bulk specific gravity of 0.6 to 1.5, a Young's modulus of 1 × 10 4 N / mm 2 or less, and a thermal shrinkage ratio of 5.5% or less. (Heat Shrinkage) A board-like building material of 12 mm × 220 mm × 110 mm was dried at 60 ° C. for 24 hours, and then one surface was covered with a 10 mm thick ceramic fiber board, and the other surface was changed to T by time t. = 345 × log 10 (8t + 1) +20 held for 60 minutes and then cooled, the length L of the short side of the center of the sample was measured, and (110−L) × 100/110 was calculated. [Selection figure] None |