Center Certification & Testing International
Project Introduction
Porosity refers to the proportion of the volume of pores (open and closed) in the volume of the material. Another concept corresponding to the porosity of the material is the density of the material. Density indicates the degree to which the material is filled with solids. It quantitatively reflects the content of solids in the material. The effect on the properties of the material is exactly the opposite of the effect of porosity. The density and porosity of the material reflect the density of the material from different aspects, usually expressed in porosity.
Calculation of porosity
Void ratio = (1-bulk density of the bulk material/apparent density of the bulk material)*100%L void ratio=*100%
Among them: P-porosity of the material,%
The structure of the void
Connected holes: communicate with each other and communicate with the outside world
Closed holes: independent and isolated from the outside world
Metal porosity
The porosity of the metal coating refers to the fine pores from the surface of the coating to the base metal. The coating porosity reflects the density of the coating surface, and the porosity directly affects the protective ability of the protective coating (mainly cathodic coating). As a coating with special performance requirements (such as anti-carburization, nitriding, etc.), porosity measurement is also extremely important, it is an important indicator to measure the quality of the coating.
Method Standard
Porosity test method
The national standard GB5935 stipulates the methods for measuring the coating porosity including the filter paper method, the paste method, the dipping method, the anode dielectric measurement of the coating porosity method, and the gas phase test method.
National Standard Reference for Electroplating
The standard of the porosity test of the electroplated coating is: GB/T17721-1999 metal cover porosity test: iron reagent test, GB/T18179--XX metal cover porosity test: wet sulfur (sulfurization) test.
ANATEL certification is a mandatory certification for telecommunications equipment or related equipment by the Brazilian National Telecommunications Administration (Agência Nacional de Telecomunica??es), including wireless communication equipment, wired communication equipment and related auxiliary equipment; this certification ensures that telecommunications equipment sold in the Brazilian market meets Brazil\'s technical standards and regulatory requirements, and guarantees the product\'s quality requirements such as radio frequency, electrical safety, electromagnetic compatibility, and electromagnetic exposure. If the product entering Brazil does not complete ANATEL certification, it may face fines, seizures, and other penalties.
COC certification in Algeria is a mandatory certification for products exported to Algeria, ensuring that the products comply with the country\'s safety, quality, and technical standards. The certification process includes document review, product testing, and factory inspection. Products that pass certification can be legally sold in the local market, protecting consumer interests and promoting fair trade.
GCC certification is the abbreviation for Gulf Cooperation Council certification, which is a mandatory certification requirement for products entering the market in Saudi Arabia and other countries in the Gulf region.
Porosity refers to the proportion of the volume of pores (open and closed) in the volume of the material. Another concept corresponding to the porosity of the material is the density of the material. Density indicates the degree to which the material is filled with solids.
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