Powder, granule and liquid dyes can contain the same colouring matter. They differ in how they are handled, dosed, stored and shipped.
The right form depends on your plant. A mill with automatic dispensing may prefer liquids or granules. A small dyehouse that weighs by hand may prefer powders. Ask your production team before you change form.
A change of form can also change the recipe. The same dye in granule and powder form may not give exactly the same strength or dissolving behaviour, so run lab and bulk trials before switching a running quality.
Powder
- Powder is the most common and usually the most compact form per unit of colour.
- It dusts when weighed, which is a health risk for workers and can spot fabric nearby.
- It absorbs moisture if the pack is left open, which can cause lumps and, for reactive dyes, strength loss.
- Some powders are sold as low-dust grades, treated with a small amount of oil or a dedusting agent.
Granules
- Granules are made by spray drying or agglomeration, so they are nearly dust-free.
- They flow freely, which suits automatic powder dispensers.
- They dissolve well if made properly, but poorly made granules can be hard on the outside and dissolve slowly.
- They often take more space per kilogram than powder because of their lower bulk density.
- Ask for a dust test and a dissolving test on a sample before you order bulk.
Liquid
- Liquids suit pumped, automatic dosing and remove weighing and dissolving steps, which saves labour and improves repeatability.
- They contain water, so you ship and store more weight per unit of colour.
- They can settle, freeze, grow mould or lose strength over time, so shelf life is often shorter.
- They need clean drums or IBCs and care with temperature in transit, especially in winter.
- Some liquids contain small amounts of biocide or solvent, which must appear on the safety data sheet.
How to compare offers
Compare by colour delivered, not by kilogram. Ask each supplier for strength against your standard in the form offered, then work out how much product you need for a typical batch. Include freight and storage, since a liquid carries water across the ocean.
Ask for a shelf life statement for each form and the storage conditions it assumes. Liquid dyes may also need a different hazard assessment, so check the safety data sheet and transport class for each form. Read the shelf life of dyes and pigments and how dyes are packed for export.
Next step
We can source the form your plant needs, check packing and labels, and confirm that each lot matches your standard in strength and shade before it ships. To begin, book a free sourcing review.