Cangzhou Xincheng Weiye Chemical Co., Ltd is producing vat dyes for 30 years with reliable quality and competitive prices. Here we give smoe suggestions for clients when they buy vat dyes.

Model, color light and color power

1. It is not enough to just look at the Chinese common name. Confirm the C.I. number and product name (such as Vat Orange 1, C.I. 59105, commonly known as Golden Yellow RK). Different manufacturers have significant differences in the color of the same dye.

2. First, request a sample for sampling, seal the standard sample, and compare the color light and coloring strength of the bulk with the standard sample; The contract specifies the color difference acceptance criteria (Δ E range) to avoid verbal “similarity”.

3. Be wary of low-priced mixed recycled materials, as low-priced goods often have batch color differences and fluctuating color power.

Key technical indicators

1. Particle size/fineness, dispersibility: The suspension rolling dyeing process requires high particle fineness, and coarse particles are prone to color spots, color spots, and settling delamination; The dispersion uniformity can be quickly screened using the filter paper infiltration method.

2. Moisture, sieve residue, and water-insoluble *. Excessive moisture can easily cause clumping, affecting dispersion and dyeing effects.

3. Color fastness data: resistance to sun exposure, washing, friction, and chlorine bleaching fastness. The price difference between different fastness grades is significant, matching the customer’s fabric grade.

>Important feature reminder:

The vat dye itself is insoluble in water and requires a combination of sodium hydroxide and sodium hydroxide to reduce it to a latent color before it can be dyed; Confirm the restoration performance and stability of the hidden color body during procurement. Poor restoration can result in low dye uptake and color distortion.