What Is Desizing in Textiles?
Desizing is the first wet-processing step carried out on greige fabric to remove the sizing materials applied to warp yarns during weaving.
Sizing is essential for:
Improving yarn strength
Reducing hairiness
Enhancing loom efficiency
However, once weaving is complete, this same sizing layer becomes a barrier to dye penetration and finishing chemistry, making desizing unavoidable-unless the sizing chemistry itself is redesigned.
To learn more about the Desizing Process, click here.
Why Are Different Desizing Methods Required?
The method of desizing depends entirely on the type of sizing agent used.
Insoluble starch → needs enzymes
Synthetic polymers (PVA) → need oxidative or alkaline treatment
Water-soluble polysaccharides → need only hot water
This is why desizing is best understood not as a finishing process, but as a direct consequence of sizing choice.
What Are the Different Methods of Desizing?
1. Enzymatic Desizing
Enzymatic desizing is the most commonly used method in cotton textiles.
How it works
Uses amylase enzymes
Enzymes hydrolyze starch into water-soluble sugars
Fabric is then washed to remove residues
Advantages
Gentle on cotton fibers
Selective action on starch
Widely established
Limitations
Ineffective on synthetic sizing agents
Sensitive to pH, temperature, and time
Adds biological load to effluent
Increases process cost
Enzymatic desizing exists primarily because traditional starch becomes insoluble once dried on yarn.
What Is Oxidative Desizing?
Oxidative desizing uses oxidizing chemicals to break down sizing materials.
Common oxidants
Hydrogen peroxide
Sodium persulfate
Hypochlorite (limited use)
Advantages
Works on starch and some synthetic polymers
Faster than enzymatic methods
Limitations
Risk of fiber damage
Reduced fabric strength
High chemical consumption
Increased COD in effluent
Oxidative desizing is often used when PVA or blended sizing systems are present, making it less environmentally favorable.
What Is Hot-Wash Desizing?
Hot-wash desizing relies purely on thermal solubility of the sizing agent.
How it works
Fabric is washed in hot water
Size dissolves and is rinsed away
No enzymes or chemicals required
Key requirement
This method works only when the sizing agent is fully water-soluble by design.
Why Hot-Wash Desizing Represents a Technological Shift
Traditional desizing methods exist because conventional sizing agents chemically resist water.
Modern water-soluble polysaccharide sizing systems-such as Sizaltex-type sizing technology-are engineered to:
Form a strong film during weaving
Dissolve completely in hot water
Leave no chemically bound residue
Practical implication
Desizing is no longer a separate chemical process-it becomes a simple washing step.
Which Is the Most Sustainable Method of Desizing?
Criteria | Enzymatic | Oxidative | Hot-Wash |
Chemicals required | Yes | Yes | No |
Enzymes required | Yes | No | No |
Fiber damage risk | Low | Medium–High | Minimal |
Effluent load | Medium | High | Very Low |
Energy efficiency | Medium | Medium | High |
Sustainability | Moderate | Low | Highest |
From a lifecycle perspective, hot-wash desizing is the most sustainable - but only when the sizing chemistry enables it. It’s sizing chemistry can only be enabled by using water soluble sizing agents like Sizaltex.
To learn more about this process, click here.
To learn more about this sizing agent, click here.
What Are the Environmental Impacts of Traditional Desizing Methods?
Traditional desizing releases:
Hydrolyzed starch sugars
Synthetic polymer residues
Enzyme by-products
Surfactants and stabilizers
Environmental concerns
High COD and BOD
Increased ETP load
Sludge generation
Poor biodegradability (especially PVA)
Reducing desizing complexity is one of the fastest ways to lower wet-processing environmental impact.
How Modern Sizing Technology Reduces the Need for Desizing
Instead of improving desizing chemistry, progressive mills are:
Reducing size add-on
Eliminating synthetic polymers
Adopting water-soluble sizing systems
With such systems:
Desizing enzymes become unnecessary
Oxidative treatments are avoided
Water consumption drops
Effluent treatment simplifies
This represents a process-level sustainability improvement, not just a chemical substitution.
Key Insight: Desizing Is a Consequence, Not a Necessity
Desizing is required only because traditional sizing agents resist removal.
When sizing is:
Fully water-soluble
Non-crosslinking
Thermally dispersible
👉 Desizing becomes optional rather than mandatory
Frequently Asked Questions
Is enzymatic desizing mandatory for cotton fabrics?
Only when conventional starch sizing is used.
Can oxidative desizing damage fabric?
Yes, especially if not tightly controlled.
At what temperature does hot-wash desizing work?
Typically 80–90 °C, depending on fabric construction.
Does hot-wash desizing affect dyeing quality?
No, uniform size removal often improves dye consistency.
Is sustainable desizing about changing finishing or sizing?
Primarily changing sizing chemistry, not finishing chemistry.
Reference & Backlinks
ZDHC Wastewater Guidelines (Desizing Effluent COD/BOD Limits),
https://downloads.roadmaptozero.com/output/ZDHC-Wastewater-Guidelines
ZDHC Wastewater V1.1 (Wet Processing Standards),
https://wastewater.sustainabilityconsortium.org/downloads/zdhc-wastewater-guidelines-verson-1-1/
Textile Wastewater Discharge Standards (Desizing Load),
ZDHC Wastewater PDF (Oxidative/Enzymatic Impacts),
https://lederpiel.com/wp-content/uploads/2019/08/ZDHC_WastewaterGuidelines_V1.1_JUL19.pdf
Wastewater Treatment for Textiles (Desizing Focus),
https://studylib.net/doc/28191281/wastewater-treatment-technologies-for-the-textile-industr...
GOTS Implementation Manual (Sustainable Desizing),
https://global-standard.org/images/Implementation_Manual_7.0_Second_Revision_Draft.pdf
GOTS Official Site (Organic Wet Processing),
OEKO-TEX Standards (Desizing Chemical Compliance),
https://www.oeko-tex.com/en/our-standards/
OEKO-TEX STeP (Eco Wet Processes),
https://www.oeko-tex.com/en/our-standards/oeko-tex-step/
PMC: Potato Starch Eco Sizing (Enzymatic/Hot-Wash Desizing),
https://pmc.ncbi.nlm.nih.gov/articles/PMC6572457/
PMC: Starch Graft Copolymer (Sustainable Removal Methods),
https://pmc.ncbi.nlm.nih.gov/articles/PMC10820382/
PMC: Corn Starch Derivatives (Hydrolysis Efficiency),
https://pmc.ncbi.nlm.nih.gov/articles/PMC7361798/
PMC: Starch Bio-Composites (Low-Residue Desizing),
https://pmc.ncbi.nlm.nih.gov/articles/PMC11137591/
ACS ES&T: PVA Desizing Alternatives (Oxidative Challenges),
https://pubs.acs.org/doi/10.1021/es504988w
PubMed: Biodegradable Slashing (Enzyme vs Hot Wash),
https://pubmed.ncbi.nlm.nih.gov/25687520/
ScienceDirect: Keratin Desizing Pollution Reduction,
https://www.sciencedirect.com/science/article/abs/pii/S0959652613006598
Inflibnet: Grey Cloth Desizing, Scouring, Bleaching (Methods PDF),
_ ...
ICIRESM: Wet Processing Environmental Impacts & Effluent (Desizing),
...
Wiley: Textile Wet Processing Review (Enzymatic/Oxidative Effluent),
https://onlinelibrary.wiley.com/doi/abs/10.1002/tqem.21538
ScienceDirect: Fabric Wet Processing Gate-to-Gate (Desizing Assessment),
https://www.sciencedirect.com/science/article/abs/pii/S0048969722065949
GarmentsMerchandising: Desizing in Greige Processing (Methods Comparison),
https://garmentsmerchandising.com/difference-between-greige-fabric-and-rfd-fabric/
TextileSchool: Basic Wet Operations (Enzymatic Desizing),
https://www.textileschool.com/206/basic-weaving-operations/
TextileLearner: Sizing Removal Techniques (Acid/Oxidative),
https://textilelearner.net/different-parts-of-loom-and-their-functions/
Persistence: Sizing Chemicals Market (Desizing Innovation),
https://www.persistencemarketresearch.com/market-research/textile-sizing-chemicals-market.asp
Markets and Markets: Textile Chemicals (Sustainable Methods),
https://www.marketsandmarkets.com/Market-Reports/textile-chemical-market-12380328.html
Mordor Intelligence: Chemicals Market (Green Desizing),
https://www.mordorintelligence.com/industry-reports/textile-chemicals-market
Heuritech: 2026 Fabric Trends (Eco Wet Processing),
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Disclaimer
The information provided in this blog is intended solely for educational and informational purposes within the textile industry. While the content references technical concepts, sizing and desizing practices, and general chemical information, it does not constitute professional, commercial, or operational advice for any specific textile process or production environment.
Process conditions, chemical selections, and operational parameters may vary significantly across mills, machinery types, fabric constructions, and environmental constraints. Readers should always consult qualified technical professionals, internal laboratory data, and product-specific Technical Data Sheets before making any decisions related to textile processing.
Any references to Alpenol, Sizaltex, or other products are included only for contextual, educational, and illustrative purposes and should not be interpreted as endorsements, recommendations, or guarantees of performance. The authors assume no responsibility for decisions made based on the information contained herein.
