This * * * spot-checked 5 1 products produced by 5 1 enterprises in 9 provinces and municipalities such as Beijing, Tianjin and Hebei, and 43 products were qualified, with a sampling pass rate of 84.3%. According to the compulsory national standard GB 18583-200 1, the free formaldehyde, benzene, toluene+xylene, total volatile organic compounds and other items of white latex products were detected. According to the standard of HG/T 2727- 1995, the pH value and viscosity were tested.
During the spot check, it was found that the free formaldehyde of seven products exceeded the standard, and the contents ranged from 1.65 and 438+0g/kg to 1.5g/kg, all of which were higher than the requirements of the compulsory national standard 1.0g/kg. The source of formaldehyde in white latex products is mainly the free formaldehyde that remains in the glue and is not fully reacted during synthesis, or it is added to the adhesive as an assistant, preservative and crosslinking agent, thus causing the free formaldehyde to exceed the standard.
In the spot check, it was also found that the pH value and viscosity of individual products were unqualified. PH value and viscosity are important indexes that affect the adhesive properties of products. If the pH value is too high, it will cause some corrosion to the wood, while the unqualified viscosity will directly affect the initial viscosity of the product. These two indexes ultimately affect the adhesive strength of products to a certain extent.
Experts from the General Administration of Quality Supervision, Inspection and Quarantine remind consumers to pay attention to the products sold by large building materials supermarkets when choosing white latex products. Large-scale building materials supermarkets stress reputation and brand, and have a set of perfect purchase channels, with reliable product quality and relatively reasonable price. At the same time, we should pay attention to the choice of products produced by famous brand enterprises. Since the development of white latex industry, some enterprises have grown into regional brand products after years of experience. With advanced technology, perfect quality management system and good cost performance. List of unqualified products and their enterprises in some spot checks:
Dongguan Li Shan Chemical Co., Ltd. Bai Ru Jiao Ying Tang
Brand white rubber tree of Jiaxing Cheng Ju Songshu Chemical Co., Ltd.
Beijing Zheng Feng Construction Decoration Material Co., Ltd. Bai Ru Jiaokuoda
Beijing Yinghai Hi-Tech Adhesive Factory Bairujiao Ecology Baitayuan
Haiyan latex paint factory No.2 polyvinyl acetate emulsion Chunzheng
Hebei normal university experimental chemical plant white latex yuhua district
Ningbo Jiangbei Yongqiao Adhesive Factory Polyvinyl Acetate Yongqiao