1. Air conditioning and ventilation fans are not allowed during the sealing and testing process, unless there are special requirements for central air conditioning or customer needs, which must be documented in advance.
2. Avoid any activities that could affect test results during the sealing and testing phase, such as smoking, using air fresheners, pesticides, or operating air purifiers. These actions may interfere with the accuracy of the data collected.
3. The testing area must be kept clean and free from any leftover materials such as paint, debris, or signs. Ensure all surfaces are clear before starting the test to maintain a controlled environment.
4. During the sealing and testing process, avoid using chemical products like air fresheners, perfumes, or scented candles. These substances can introduce contaminants that might skew the results.
5. All doors in each room should be closed as tightly as possible during the test. Do not leave any windows or doors open, as this could lead to inaccurate readings due to external air flow.
6. For air sampling at the door, each test point typically requires approximately 20 minutes. Make sure to follow the proper procedure to ensure accurate and reliable samples are collected.
7. Reporting time: A CMA-certified report will be issued within two working days after the sampling is completed. This ensures timely delivery of results while maintaining high standards of quality and compliance.
Additional Notes: Always double-check that all equipment is properly set up and functioning before beginning the test. Maintain a consistent temperature and humidity level throughout the process if required. Keep detailed records of all procedures and observations to support the final report.
Die casting is the pressure of metal molds on a die casting machine and is the most productive casting process. Die-casting machines are divided into two categories: hot-chamber die-casting machines and cold-chamber die-casting machines. The hot chamber die casting machine has a high degree of automation, less material loss, and higher production efficiency than the cold chamber die casting machine. The aluminum alloy die castings that are widely used today can only be produced on cold chamber die casting machines due to their high melting point. The main feature of die casting is that the molten metal fills the cavity under high pressure and high speed, and is formed and solidified under high pressure. The air in the cavity is wrapped inside the casting to form subcutaneous pores, so aluminum alloy die castings should not be heat treated, and zinc alloy die castings should not be sprayed on the surface (but can be painted). Otherwise, the internal pores of the casting will expand due to thermal expansion and cause the casting to deform or bubble when the above-mentioned treatment is performed. In addition, the mechanical cutting allowance of die castings should also be smaller, generally around 0.5mm, which can not only reduce the weight of castings, reduce the amount of cutting to reduce costs, but also avoid penetrating the surface dense layer and exposing subcutaneous pores, causing The workpiece is scrapped.
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