What polyethylene wax is
Polyethylene wax (PE wax) is a low molecular weight polyethylene, typically between 1,000 and 10,000 g/mol, with chains much shorter than the polymer used in plastics. Those short chains give it the properties of a wax: a defined softening point (roughly 100 to 140 °C depending on grade), hardness, and good lubricity.
For textile use, the wax is almost always supplied as an aqueous emulsion. Most textile grades are based on oxidized polyethylene wax: controlled oxidation introduces carboxyl groups onto the chain, which allows the wax to be emulsified into fine, stable particles that deposit evenly on the fiber. On the fabric, the wax forms a thin film that reduces fiber-to-fiber and fiber-to-metal friction. That friction reduction explains most of what PE wax does in finishing.
What it does in finishing
- It recovers tear and abrasion strength after resin finishing. Wrinkle-free and easy-care finishes (DMDHEU and similar crosslinkers) make cotton stiffer and more brittle, and tear strength can drop sharply. Adding a PE wax emulsion to the finishing bath lets yarns slide instead of breaking under load, and recovers a large part of the lost tear resistance. This is the usual reason PE wax appears in resin finishing recipes.
- It protects the fabric during sewing. In garment making, the needle punches through the fabric thousands of times per minute and heats up. On resin-finished or dense fabrics this causes needle cutting: broken yarns and holes along the seam. A PE wax finish lubricates the needle's path and reduces needle heat, thread breakage and seam damage.
- It improves the hand without silicone. PE wax gives a smooth, full, slightly waxy and dry hand, different from the slick, oily feel of silicone. It does not yellow whites, it does not cause silicone spotting, and it does not create the water repellency or re-dyeing problems that amino silicones can. Where a later print, coating or lamination step rules out silicone residues, PE wax is the standard hand modifier.
- It is normally used together with other softeners. Blended with silicones to combine surface smoothness with internal lubrication, or with esterquats and fatty softeners in general finishing. It also improves the cutting and sewing behavior of knits and the seam slippage performance of wovens.
Types of polyethylene wax emulsions
Three characteristics define a PE wax emulsion:
- Wax base: HDPE, LDPE or oxidized PE. High-density grades are harder, with higher softening points, and give more abrasion protection and a drier hand. Low-density and oxidized grades are softer and easier to emulsify. Most textile emulsions use oxidized PE for stability and evenness.
- Ionic character. Nonionic emulsions are the most versatile and compatible with resins, silicones and most finishing auxiliaries in the same bath. Anionic grades are common and economical but can be sensitive to hard water and cationic products. Cationic grades have affinity for the fiber and can be applied by exhaustion, useful in garment processing.
- Particle size and solids. Fine microemulsions penetrate and distribute more evenly, which matters on pale shades and lightweight fabrics. Solids content typically runs 20 to 35%, and that is what determines the real cost per batch, not the price per kilo.
PE wax, silicone and paraffin compared
| Property | Polyethylene wax | Silicone softener | Paraffin wax |
|---|---|---|---|
| Hand | Smooth, full, dry | Very soft, slick | Waxy, greasy |
| Tear strength recovery | Excellent | Moderate | Moderate |
| Sewability / needle protection | Excellent | Good | Moderate |
| Yellowing on whites | None | Amino grades yellow | None |
| Risk of spotting | Very low | Silicone spots if emulsion breaks | Can migrate |
| Durability to washing | Good | Good to excellent | Poor |
| Compatible before printing/coating | Yes | Often not | Limited |
| Relative cost | Moderate | Higher | Low |
Silicone gives more softness; PE wax gives more mechanical protection and fewer process risks. The two are frequently combined.
Where it is used
- Resin / easy-care finishing of cotton and blends: the standard additive to recover tear strength, typically padded together with the crosslinker.
- Whites and pale shades, where amino silicone yellowing is unacceptable.
- Fabrics destined for garment making: shirting, denim and dense wovens where needle cutting is a known problem.
- Sewing threads, where the lubrication reduces friction and thread breakage at high sewing speeds.
- Other substrates: oxidized PE wax emulsions are also used as surface lubricants in paper finishing and as components of leather finishing waxes, as well as in inks and coatings.
How to choose one
- Match the ionic character to the bath. For resin finishing baths (crosslinker, catalyst, softeners), a nonionic, electrolyte-stable emulsion is the safe choice. Confirm compatibility with a bath stability test before scaling.
- Check shear and catalyst stability. The emulsion must survive padding, pumping and the magnesium chloride catalyst without breaking. A broken emulsion means wax spots.
- Choose hardness for the effect. Harder HDPE-type grades for maximum abrasion and sewability protection with a dry hand; softer oxidized grades where hand and evenness matter most.
- Verify whiteness behavior. The emulsion must not yellow under curing conditions (typically 150 to 170 °C). Test at the real curing temperature.
- Compare at equal solids. Quotes only make sense per kilogram of active wax delivered to the fabric.
Dosing
- Padding (resin finishing): typical doses run 10 to 40 g/L depending on fabric weight and the severity of the resin, alongside the crosslinker and other softeners.
- Exhaustion (garments, knits): cationic or specially formulated grades at roughly 1 to 3% on weight of fabric, 20 to 40 °C, 15 to 20 minutes, mildly acidic pH.
- Always pre-dilute into water under stirring before adding to the bath; never dose the concentrate onto the fabric.
- Run a lab trial measuring the properties that matter for the article: Elmendorf tear, seam damage after sewing, whiteness after curing, and hand panel. Adjust the dose to the trial result.
Casdisoft PE Conc
Our CASDISOFT PE CONC is a concentrated polyethylene wax emulsion developed for these applications: it recovers the tear strength that resins take away, protects seams in garment making, and gives a clean, dry hand. It is stable in resin finishing baths and safe on whites.
More information on our polyethylene wax page and on the CASDISOFT PE CONC product page. To request a sample and a recipe recommendation for your process, contact our technical team.