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Salt Spray Test Chamber: A Three-Generation Material Explanation
Category: Industry News
The principles of salt spray test chambers have kept pace with the times. As our pace of life quickens and our aspirations for material and spiritual well-being grow, the environmental testing equipment industry has naturally kept up.
First-generation salt spray test chambers were made from FRP (Fiber Reinforced Polymer), also known as fiberglass, a chemically reinforced plastic. It is lightweight, hard, non-conductive, stable in properties, highly impact-resistant, requires less comprehensive utilization, and is corrosion-resistant. It can replace stainless steel in the production of equipment components, small vehicles, and containers.
Second-generation salt spray test chambers use PVC (Polyvinyl Chloride) board. This is a vacuum-formed thin film used to cover various control panel surfaces, hence also called decorative film or sizing paper. It is widely used in the decorative building materials, packaging, and pharmaceutical manufacturing industries. 60% is used in the decorative industry, followed by the packaging industry, with some use in other smaller manufacturing sectors. Based on hardness and software levels, it can be divided into soft PVC and hard PVC. Based on processing technology, it can be divided into PVC film foaming materials and PVC film foaming materials.
Third-generation salt spray test chambers use PP (Polypropylene) board, a semi-crystalline material. It is stronger than PE (Polyethylene) and has a higher melting point. Because its softening temperature is 150, it has larger crystals, resulting in good surface bending stiffness and scratch resistance. No natural environmental stress cracking problems have been found, and it has excellent impact resistance. Due to its crystalline structure, PP also has a high shrinkage rate, typically 1.8-2.5%. In addition, the uniformity of shrinkage rate is much better than materials like PE-HD. Adding 30% of laminated glass preservative can reduce the shrinkage rate to 0.7%. Both homopolymer and copolymer PP materials have excellent water absorption resistance, strong acid and alkali corrosion resistance, and dissolution resistance, but they are not resistant to aromatic solvents like benzene or propyl titanate organic solvents.
Salt spray test chambers have a wide range of applications, widely used in agriculture, scientific research, education, health, and national defense, and are an important product in the environmental testing industry. The working principle of a salt spray test chamber is relatively simple, mainly using corrosive gas and liquid to spray samples. The time it takes for corrosion to appear on the sample after spraying the corrosive liquid is used as a measure of the sample's corrosion resistance. A longer time indicates better corrosion resistance.
The corrosive solution for salt spray test chambers is mainly a 5% concentration of sodium chloride solution, or a salt spray corrosive solution made by adding 0.26 grams of copper chloride per liter to the sodium chloride solution. In addition, the salt spray test chamber independently controls the salt spray deposition and spraying amount, ensuring a constant test temperature, easy operation, and stable test environment. Therefore, it is often used to test the corrosion resistance of daily necessities and industrial products.
The above is an introduction to the three generations of materials used in salt spray test chambers. For more information, please contact us!
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