Why It Matters
Calcium, magnesium and iron in process water precipitate dye and cause shade variation and aggregation
Solution Approach
Calcium, magnesium and iron in process water precipitate dye and cause shade variation and aggregation RawSource supplies the base chemicals that go into these programs. We can help with product selection, grade matching, and sourcing from multiple origins for supply security.
Typical Processing Workflow
1
Substrate & Process Assessment
Identify the fiber and process stage (pretreatment, dyeing, finishing) and the performance, hand, and compliance targets.
2
Auxiliary Selection
Match surfactants, wetting and dispersing agents, softeners, fixatives, or pH and sequestering agents to the substrate and bath chemistry.
3
Lab Dip & Dosing
Confirm dose and sequence on a lab dip or pad trial, checking levelness, fastness, hand, and bath stability.
4
Production Validation
Verify reproducibility, fastness, and effluent compliance at scale, and set the recipe and packaging for production.
Recommended Chemistries (4)
Ethylenediaminetetraacetic Acid
CAS 60-00-4
Amines & Amides
Chelant for metal ion sequestration
chelates Ca2+/Mg2+/Fe so they can't precipitate dye or shift the shade
Melting Point: 237 °C Density: 0.86 at 20 °C Solubility: 1000000 mg/L at 25 °C
Full Details
DTPA (Diethylenetriaminepentaacetic Acid)
CAS 67-43-6
Amines & Amides
High-performance chelant for iron and copper
high-stability chelant that holds iron and copper even at alkaline dyeing pH
Physical Description: White to off-white solid Boiling Point: Decomposes Melting Point: 219-220 ºC
Full Details
Citric Acid (Anhydrous, FCC Food Grade)
CAS 77-92-9
Acids & Salts
Chelation / Sequestration
mild sequestrant and pH control for metal ions in softer baths
Melting Point: 153 °C (anhydrous) Boiling Point: Decomposes Density: 1.54 at 20 °C
Full Details
HPAA (2-Hydroxyphosphonoacetic Acid)
CAS 23783-26-8
Phosphate Esters & Derivatives
Chelation / Sequestration
phosphonate sequesters Ca/Fe and inhibits scale on heated dye-machine surfaces
Physical Description: Brown liquid. Slight acrid odor
Full Details
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