Recently, the State Administration of Quality Supervision Organization on the metal spiral wound gasket and glass fiber rovings, fabrics product quality supervision and spot checks carried out, the pass rates were 86.4% and 83.9%.
In the metal gasket spot checks found that the main quality problems, firstly, the compression ratio of individual products failed. Compression ratio is a metal spiral wound gasket products, key performance indicators. Gasket compression ratio is too large, when properly installed preload shim likely to cause structural damage; gasket compression ratio is too small, the need to preload the initial installation of a larger, easy to achieve sealing effect, making it easy to run, run , drip, leak. Secondly, the spring rate of individual products failed. The spring rate is gasket gasket after unloading gasket's ability to restore elasticity. Gaskets rebound rate is high, indicating that the gasket compensation ability, good sealing effect. National standards, flexible graphite spiral wound gasket spring rate is not less than 17%, spot checks of individual products rebound rate of 13.5%.
In this sample, the glass fiber products, the main quality issues: first, the individual products composite flexural strength failed. Flexural strength composite reinforcement reinforcing effect is the assessment of the important parameters. Enhanced wetting agent is a glass fiber containing the coupling agent coating, to promote the glass fiber and the resin matrix, and to improve the strength and life of the composite. Product failure is mainly due to enhanced wetting agent is not used, resulting in mechanical strength composite products meet the requirements, would not achieve the role of reinforcement. Second, the individual products combustible content failed. Glass fiber refers to the existence of combustible matter content of the organic content of the glass fiber is mainly the content of wetting agents. Wetting agent content is too low, the yarn will not achieve the protective effect, which may affect the binding of glass fiber and the resin results.
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