black gypsum screw

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  • At present, it is recognized that the best surface treatment method for rust prevention is to make dacron rust. Generally, auto parts have been used this method for rust prevention. The salt water test generally lasts more than 96 hours. But if the hardware is used in very poor conditions, there are also people who use “asphalt” which is tar to do the surface treatment.
  • Material: low carbon steel wire, stainless steel wire, PVC wire, copper wire
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