... is made from waste crop, sand. Mgo waterproofing board production line www.midbm.com.cn wheat straw roof tile: 1,high ... There may not be cracking, flake off, through holes and cracksNo cracking, flake off, through holes and cracksHydroscopicity26%≤14%ImperviousnessAfter ... 3≤0.66 This machine belongs to fully automatic boards production line, it can produce wallboards ,partition board and decoration ...