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GB/T 5910-1998 轿车 质量分布 现行 发布日期 :  1998-05-06 实施日期 :  1999-01-01

定价: 24元 / 折扣价: 21 加购物车

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定价: 1473元 / 折扣价: 1311 加购物车

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定价: 193元 / 折扣价: 165 加购物车

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定价: 无文本 / 折扣价: 0

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JB/T 5910-2005 电 除 尘 器 现行 发布日期 :  实施日期 : 

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定价: 1840元 / 折扣价: 1638 加购物车

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JIS T 5910:2005 Dental handpieces -- Air-powered scalers and scaler tips 被代替 发布日期 :  2005-03-25 实施日期 : 

定价: 110元 / 折扣价: 94 加购物车

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QB/T 5910-2023 罐头食品容器用螺纹旋开盖 现行 发布日期 :  2023-12-20 实施日期 :  2024-07-01

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JB/T 5910-2013 电除尘器 现行 发布日期 :  2013-11-25 实施日期 :  2014-03-01

定价: 无文本 / 折扣价: 0

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4.1 With the need to calculate free formaldehyde levels in emulsion polymers, it is necessary to make the determination without upsetting any equilibria that might generate or deplete formaldehyde. This test method provides a means for determining ppm levels of free formaldehyde in emulsion polymers without upsetting existing equilibria.1.1 This test method is used for the determination of free formaldehyde (HCHO) in emulsion polymers without upsetting existing formaldehyde equilibria. The procedure has been evaluated using acrylic, acrylonitrile-butadiene, carboxylated styrene-butadiene and polyvinyl acetate emulsion polymers. This test method may also be applicable for emulsion polymers of other compositions. The established working range of this test method is from 0.05 to 15 ppm formaldehyde. Emulsion polymers must be diluted to meet the working range.1.2 This test method minimizes changes in free formaldehyde concentration that can result from changes in the physical or chemical properties of an emulsion polymer.1.3 There are no known limitations to this test method when used in the manner described. The emulsion polymer test specimen must be prepared with a diluent that has a pH similar to that of the emulsion. Use of an inappropriate pH may upset formaldehyde equilibria and result in incorrect formaldehyde levels.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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定价: 201元 / 折扣价: 171 加购物车

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JIS T 5910:2015 Dental handpieces -- Air-powered scalers and scaler tips 作废 发布日期 :  2005-03-25 实施日期 : 

定价: 164元 / 折扣价: 140 加购物车

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定价: 3862元 / 折扣价: 3283 加购物车

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