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.
As a household appliance, when humidifiers are sold on e-commerce platforms such as JD.com, Tmall and Taobao, they must provide quality inspection reports that meet national standards to ensure quality and safety. According to the Chinese national standard GB4706 series, humidifiers must pass safety tests. The quality inspection report must prove that the product meets safety requirements to avoid causing harm to consumers during use. The quality inspection report provides consumers with a basis for purchase. After being tested by an independent third-party institution, it enhances consumers\' trust in the product. In terms of market access, some shopping malls, supermarkets or government procurement projects require quality inspection reports as proof of product qualification.
SRRC certification is one of the necessary conditions for products to enter the Chinese market for sale. It ensures that the wireless transmission characteristics of the wireless camera comply with national standards, avoiding communication problems caused by radio interference and ensuring the legality and compliance of the product.
FCC certification is a mandatory requirement for wireless device certification in the US market. Through FCC ID certification, wireless microphones can prove their compliance with US radio transmission standards, avoiding market bans or fines for violations. This is particularly important for products that hope to be sold in the US market.
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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