The raw materials selected for various types of plastic pipes are non-toxic except that UPVC must control the content of VCM. But what is the hygienic performance of the finished product? How to evaluate? This is also a problem that users are more concerned about. In general, current plastic pipes have no negative impact on the quality of drinking water. For the sake of safety, the user should ask the manufacturer to provide relevant test reports when purchasing the tube tree. In October 1998, the State Bureau of Technical Supervision and the Ministry of Health promulgated the National Standard GB/T17219-lg98 "Safety Evaluation Standards for Drinking and Drinking Water Distribution Equipment and Protective Materials". The health requirements covered by the standard are as follows: 1. All water distribution equipment and protective materials that come into contact with drinking water shall not pollute the water quality. The water quality of the pipe network shall meet the requirements of GB5749-85. 2. The drinking water distribution equipment and protective materials must be immersed in accordance with the specified requirements, and the test results must meet the requirements stipulated by the standards. 3. Mutagenicity tests should be performed and the results should be negative. 4. Raw materials for the production of drinking water, water distribution equipment and protective materials need to be food grade. Concerned about surprises Label: protective material, water distribution, mutagenicity test, soak test, water quality Previous: Why the metal pipe surface should be degreased Next: The role of tool technology in modern manufacturing Solid Carbide Drill With Internal Coolant
Features of stainless steel cutting:
Chips are not easy to break and are easy to bond: stainless steel has great plasticity and toughness. Chips are continuous during turning, which not only affects the smooth operation of the operation, but also crushes the processed surface.
When drilling stainless steel, the chips are easy to stick to the drills, that's need the coolant oil to flush out the chips from the holes.
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