Raw paper-board (I) comprises org. fibres (II) mixed with 20-70 (55)% diabase wool (III), and a binder (IV). (II) comprises rags, chem. pulp, or a mixture thereof. (III) contains 16-17% Al2O3, 11% FeO+Fe2O3 and 2% alkali. (IV) is a mixture of carbamide-resin and starch, this having a high affinity for (III). Sheets of pure (III) have been used for wall etc., insulation but they are relatively brittle and only really useable for the insulation of supporting walls, etc. Mixed with (II), however, together with (IV), such sheets can be used as roofing felt having good dimensional stability due to (III), and good strength due to (II) present which makes the product resistant to mech. stress.
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机译：原始纸板（I）包含组织。纤维（II）与20-70（55）％的辉绿岩羊毛（III）和粘合剂（IV）混合。 （二）包括破布，化学。纸浆或其混合物。 （III）包含16-17％的Al 2 O 3，11％的FeO + Fe 2 O 3和2％的碱。 （IV）是氨基甲酸酯树脂和淀粉的混合物，其对（III）具有高亲和力。纯（III）的板材已用于墙壁等的隔热，但它们比较脆，仅可真正用于支撑墙等的隔热。但是，与（II）混合使用时，此类板材可以与（IV）一起使用用作屋顶毡的屋面毡由于（III）而具有良好的尺寸稳定性，并且由于存在（II）而具有良好的强度，这使得该产品耐机械腐蚀。强调。
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