Acid Black 234 Acid Black Dye
C.I. No.:30027
CAS No.: 157577-99-6
Molecular Formula: C34H26N10Na2O9S3
Molecular Weight: 860.81
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Shade:Black
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Relative name: Acid Black NBC;Acid Black NB-G;Weak Acid Black NB-G;Acid Black NR;Apollo Leather Black NGRL;Black GS;Chenitan Black FK2;Chenitan Carbon Black;Colocid Black NB;Coriamine Black NB-G;Dayglo Acid Black 234 200%;Acid Black 2BNG,Acid Black NE;Acid black 2BNG
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Applications:
Mainly used for wool, silk, cotton and glue dyeing, also can be used for leather dyeing.
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Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
Round head Tapping screw,hex tapping screw,flat head tapping screw,pan head tapping screw,truss head tapping screw
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