Cotton and polyester may look similar, but they behave very differently during screen printing. Using the wrong ink can lead to rough-feeling prints, dye migration, or heat-related issues.

At One Stroke Inks, we help printers match the right ink to the fabric. Understanding the differences between cotton and polyester helps you avoid problems and produce better prints.

Printing On Cotton Garments

Cotton is one of the easiest fabrics to print. It handles heat from the dryer and flash unit well. Most high-temperature ink series will work without major heat-related issues.

General-purpose inks perform extremely well on cotton shirts. They provide excellent opacity, soft prints, and long-lasting durability.

Popular inks for cotton garments include #26 HV White, Underbase White, and Hybrid Series.

Printing On Polyester Garments

Polyester requires more attention because the fabric contains dyes that can become unstable when heated.

When the fabric is exposed to heat from the flash unit and dryer, those dyes can bleed into the ink and change the color of the print. White prints often turn pink on red polyester and gray on black polyester.

This problem is known as dye migration.

Low-Bleed Inks Help Prevent Problems

Special low-bleed inks contain bleed blockers that help prevent dyes from migrating into the print.

Products like Smart Series and .357 Series are designed to help printers achieve better results on polyester garments.

Low-cure formulations are also useful because they reduce the amount of heat required during curing.

Low-Cure Is Not The Same as Low-Bleed

Polyester also tends to be more heat-sensitive than cotton. Excessive temperatures can scorch the fabric or cause ghosting issues.

Low-cure refers to the temperature at which the plastisol becomes a solid ink film. An ink can be low-cure and not low-bleed. Some apparel is temperature sensitive but does not bleed heavily.

Bleed resistance refers to how well the ink performs on polyester over time. Not all polyester items bleed at the same rate. The more bleed-resistant an ink is, the stiffer it becomes.

This is why inks with the most bleed resistance are not always the best option for 100% cotton and blends. We offer several low-cure inks designed to feel exceptionally soft on these fabrics. These include our Hybrid Pro Series and Soft FX LC Series.

The Correct Ink Can Save You Money

Aside from the obvious savings from reducing misprints and damaged goods, matching the correct ink to the garment may also reduce overall ink consumption.

An ink designed for 100% polyester may not cover cotton fibers as well as an ink specifically designed for 100% cotton.

If you have to stroke an ink multiple times to get even coverage, then something could be wrong. You may not have chosen the best ink for that particular garment.

The weave of the fabric matters just as much as the fabric content. This is particularly true with 100% polyester hoodies. We make inks specifically for tough jobs like these when coverage matters just as much as bleed resistance. Inks such as ELT-X White and Mia White are ideal for these applications.

Final Thoughts

Understanding the differences between cotton and polyester inks helps prevent costly mistakes and improves print quality.

At One Stroke Inks, we offer ink systems designed for cotton and polyester garments. Choosing the right ink from the start helps produce quality prints, reduces ink waste, and keeps production running smoothly.