The Great star Precision Screw Co.,Ltd.
Issued Dept: Black Cheromate Cr+3AB Document No.
Plating / Dept. WI-EP-05
Issued Issued Revised Date: Page:
1 19/01/2013 1 OF 1
Dyeing:
Objective: Made screw colourful and effective in preventing rust (Black colour) Cr+3AB
The concentration of Dyeing colour in the mix time :Water 20 Liter
Fill : TR185A 2,600 Liter
Fill : TR185B 4,000 Liter
How to Practice :
Soake in Nitric acid to the polish for 5-10 seconds (Concentration : water 1 Liter for Nitric acid 5cc.)
* If the screw was not polishing please fill more the nitric acid 10cc-30cc
Washing
Soak in TR185A, TR185B (60-70 seconds)
Water temperatures : 20-80 °C
Ratio of TR185A 60 cc : Dyeing olour 10 kgs.-18 kgs.
Ratio of TR185B 60 cc : Dyeing colour 10 kgs.-18 kgs.
Washing
Dyeing
(temperatures 60-120 °C)
( untill without water)