Oxalic Acid (C₂H₂O₄ · 2H₂O) is a strong organic acid with powerful reducing, descaling, and stain-removalcapabilities. In textile processing, it is primarily used for metal-ion removal, rust cleaning, pH adjustment, and color correction. It is also widely applied in multiple industries due to its versatility.
Oxalic acid is highly effective at dissolving iron oxide (rust) stains from:
Cotton
Polyester
Blended fabrics
Dyeing machines and pipelines
Benefits:
Removes yellow/brown iron spots
Restores fabric brightness
Does not damage most fibers when properly diluted
Used for removing:
Limescale (CaCO₃ deposits)
Iron residues
Metal contamination in dyeing vessels
Applications include:
Jet dyeing machines
Jig machines
Heat exchangers
Stainless steel pipelines
Commonly used in finishing baths to:
Lower pH gently
Stabilize chemical formulations
Improve hand feel and shade stability
Oxalic acid complexes with:
Iron
Calcium
Magnesium
Other metal ions
This prevents:
Dye precipitation
Shade inconsistency
Uneven dyeing
Especially useful in reactive dyeing, where metal ions can affect shade brightness.
Used to remove:
Off-shades
Excess dye stains
Yellowing caused by metals or bleaching reactions
Common in:
Cotton dyeing correction
Polyester cleaning before reprocessing
Although not a primary bleach, oxalic acid is occasionally used to:
Enhance whiteness
Remove mild oxidation stains
Improve brightness after peroxide bleaching
Actual dosage depends on machine type, contamination level, and fabric sensitivity.
Rust removal: 1–5 g/L
Descaling/machine cleaning: 0.5–3% solution
Chelating in dye baths: 0.1–0.5 g/L
Color correction: 1–3 g/L
Finishing bath pH control: 0.1–0.3 g/L (as needed)
Excellent rust and iron stain remover
Strong chelating power for metals
Improves dyeing uniformity and shade accuracy
Easy to dissolve and handle
Effective at low concentrations
Versatile for both fabric treatment and equipment maintenance
Rust remover for metals
Cleaning of stainless steel equipment
Polishing of metal surfaces
Used in:
Scale removers
Bathroom/kitchen cleaners
Rust removal agents
Used in wood bleaching
Restoration of aged wood
Removal of iron stains caused by water and nails
pH adjustment
Removal of iron contaminants
Improving leather brightness
Intermediate chemical used in producing:
Oxalates
Pharmaceuticals
Dyes
Metal polishes
Metal-ion removal
Scale dissolution
pH control in specific processes
Strong acid → avoid contact with skin and eyes
Use gloves, goggles, and protective clothing
Store in cool, dry place
Keep away from oxidizing agents and alkalis
NGHI SON CHEMICALS IMPORT EXPORT COMPANY LIMITED
Head office:
P7-38.OT09 ("Officetel") Vinhomes Central Park, 720A Dien Bien Phu Street, Thanh My Tay Ward, Ho chi minh city, Vietnam 70000
License/Tax Code : 0312824002
Tel: +84-28-36208490
Fax : +84-28-36208492
Website: https://www.nghisonchemical.com
Email : Nghisonchem@nghisonchemical.com
Nscchem@nghisonchemical.com
Nghisonchem@gmail.com
Fact. No.1 :
Lot A5-1, D9 Street, Rach Bap IP, An Tay Commune, Ben Cat District, Binh Duong Province, Vietnam.
Warehouse No.1 :
No. 7 Street, Hai Son IP, Duc Hoa Ha Commune, Duc Hoa Ward, Long An Province
Warehouse No.2 :
Lot D, No.6-8 Street, Song Than IP, Di An Ward, Hochiminhcity, Vietnam
Warehouse No.3 :
No. 10, Song Than IP, Di An ward, Hochiminhcity, Vietnam
