【国外标准】 Standard Specification for Formaldehyde 50 % Grade Uninhibited and 37 % Grade Inhibited and Uninhibited

This specification covers the properties and requirements for 50 % uninhibited formaldehyde and 37 % uninhibited and inhibited formaldehyde. Specimens shall be suitably sampled and tested, and shall meet the specified values of the following properties: apparent specific gravity; formaldehyde content; acidity; color (Pt-Co scale); iron content; methanol content; and appearance.1.1 This specification covers 50 % uninhibited formaldehyde and 37 % uninhibited and inhibited formaldehyde.1.2 The following applies to all specified limits in this standard; for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.4 For specific hazard information and guidance, see the supplier's Material Safety Data Sheet for materials listed in this specification.1.5 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.