Nature is a very wonderful world. It provides a rich source of resources for human survival. But it also brings factors that can't be brought to humanity. Some mineral resources are harmful. The mineral resources of nature can be divided into four categories: 1. Minerals are non-toxic or even essential; 2. Minerals are strongly toxic; 3. Minerals contain toxic elements but are generally non-toxic; 4. Minerals are radioactive minerals. PVC Self-Repair High Speed Zipper Door
Zipper quick door
The curtain of the high-speed zipper door is made of 1.2MM PVC coating cloth which can be embedded into the window. The unique design of this zipper door makes it possible to provide efficient goods entrance and exit under the premise of minimizing heat loss, so as to maintain the original temperature conditions in the room. The high-speed zipper door can provide different opening and closing speeds. According to the different needs of customers to provide the best speed of adaptation. The high speed zipper door curtain section ensures the safety of equipment and personnel without any solid parts. The high speed zipper door has a self-repair function, which means that even if the curtain is derailed in the middle (e.g., hit by a forklift), The self-healing system will automatically guide the curtain rerail in the next loop.) We can do this in the event that the front or back of the door hits the curtain and derails.
The new zipper is professional for derailed repair zipper door, zipper head material nylon 66, with built-in steel wire rope and screws fixed curtain, under the impact of gravity can let the curtain out of the rapid and correct return to the track, and track teeth without damage, durable, improve the original zipper teeth easy to wear defects.
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1. Minerals are non-toxic and even essential. Minerals are non-toxic or even essential, but they can cause fatal damage under certain special conditions, including: potassium salt, diamond , asbestos and quartz .
Second, with a strong mineral itself toxic mineral itself has a strong toxicity, comprising: a red thallium ore, witherite, vitriol, arsenopyrite, orpiment, realgar, Chinese arsenic, arsine, cinnabar, galena, carnallite like.
Third, minerals, containing toxic elements but generally non-toxic
Minerals, but contain toxic elements themselves are generally non-toxic and may cause injury mainly in the smelting and use, including sphalerite, beryl, chrome iron ore, barite, fluorite, natural gold.
Fourth, minerals are radioactive minerals
For example: mineral resources such as lead.