GB 7979-1987.Pulps-Determination of dichloromethane soluble matter.本方法可用于各种化学纸浆和半化学纸浆。1原理在索氏抽提器中,用二氯甲烷抽提纸浆,经...
GB 7978-1987.Pulps-Determination of acid-insoluble ash.本方法适用于各种纸浆。1原理将纸浆灰化后用盐酸处理,过滤不溶残渣,洗净、灼烧并称重。2仪器...
GB 7977-1987.Paper , board and pulp一Determination of the electrical conductivity for the water extract.测定方法基于试样用沸水煮沸1 h,滤出抽提液在25C测定其电导...
GB 7976-1987.Insulating paper and board-Determination of the electrical conductivity forthe water extract.GB 7976适用于电气用绝缘纸和纸板。1仪器1.1 电导仪能测量电...
GB 7975-1987.Paper and board-Measurement of colour(Diff/o-geometry).GB 7975采用国际照明委员会(CIE)推荐的CIE1964补充标准色度系统，以Dgs光源10°枧场的刺激值...
GB 7974-1987.Paper and board- Measurement of brightness(Diff/o-geometry).GB 7974以Ds光源、漫射/垂直照明观测条件下纸及纸板对主波长457 nm蓝光的反射因数(%...
GB 7973-1987.Paper , board and pulps-Measurement of diffuse reflectance factor (Diff/ o-geometry ).GB 7973规定了纸浆、纸及纸板漫反射因数测定的基本条件,如仪器的...
GB 7972-1987.Telegraph tape paper for punchig.2.2纸条表面应平滑,并不允许有影响凿孔和发报的褶子、条痕、透光点、砂子、硬质块、浆团和肉眼可见的...
GB 7969-2003.GB 7969规定了电力电缆纸的产品分类、技术要求、试验方法检验规则和标志、包装、运输、贮存。GB 7969适用于额定电压不大于35kV的...
GB 7969-1987.Electric power cable paper.4检验规则4.1生产厂 应保证产品符合本标准的规定。每卷纸中应附有产品合格证。4.2 用户验收以每次交货件数...
