Why does sublimation only work on polyester or polymer-coated items?
By Promogator Staff
Reviewed Nov 4, 2026 2 min read
Sublimation ink turns into a gas under heat and pressure and bonds with materials that can open up and accept it. Polyester fibers and polymer coatings do this, so the dye becomes part of the surface. Cotton and bare metal or ceramic have nothing for the dye to bond with, so the color washes or wears off.
- Heat turns sublimation dye into a gas that bonds with polymer.
- Polyester fibers and polymer coatings accept the dye permanently.
- Cotton, bare metal and bare ceramic cannot hold the dye.
- Light-colored surfaces work best because the ink is translucent.
- Coated blanks let you sublimate mugs, tumblers and more.
How sublimation actually works
Sublimation printing uses special dye inks. The design is first printed onto transfer paper. The paper is then pressed against the item with heat, typically around 380 to 400 degrees Fahrenheit, plus pressure for a short time.
Under that heat, the solid dye changes into a gas without becoming a liquid first. That is where the name comes from. The gas needs somewhere to go. If the surface can take it in, the dye locks in as the item cools.
Why polyester and polymer coatings work
Polyester is a plastic-based fiber. Heat makes its structure open up slightly. The dye gas enters the fiber, and when it cools, the fiber closes and traps the color inside. The image is part of the material, not a layer on top. That is why good sublimated prints do not crack, peel or fade easily in the wash.
Hard items such as mugs, tumblers, phone cases and metal panels are not polymer on their own. Makers add a special polymer coating to them. The coating does the job polyester does on fabric. The dye bonds with the coating, not the metal or ceramic underneath.
Why cotton and bare surfaces fail
Cotton is a natural plant fiber. It does not open up and trap the dye the way polyester does. Bare ceramic, glass and metal are also not receptive. The dye may stick weakly for a moment, but it has no way to bond. The result is a faint, dull image that fades or washes out fast.
This is why the polyester content matters on blends. A 50/50 cotton and polyester shirt will show a faded, vintage look, because only the polyester takes the dye. For bright, strong color, aim for high polyester content, ideally 100%, or at least a high percentage (commonly 65% or more).
Things to know before you order
- Color of the item matters. Sublimation ink is translucent. It adds color but cannot cover it. White or very light items give the truest colors. Dark items are generally a poor fit.
- No white ink. You cannot print white on a colored item with sublimation.
- Full-color designs are easy. Photos, gradients and all-over patterns work well, and many sublimation setups do not charge by the color.
- Other methods suit other items. For cotton, options such as screen print, embroidery, DTG or heat transfer are usually better choices. See Imprint methods for a side-by-side look.
If you are unsure whether an item suits sublimation, the product page lists the imprint methods it offers.
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People also ask
Can you sublimate cotton?
Not with good results. Sublimation dye does not bond with cotton fibers, so the image looks faint and washes out. For cotton shirts and totes, choose screen print, embroidery, DTG or heat transfer instead.
Why won't sublimation work on 100% cotton?
Cotton is a natural fiber that does not open up and trap the dye gas the way polyester does. The dye has nothing to bond with, so it fades or rinses away.
What materials can be sublimated?
Polyester fabric and items with a polymer coating. Common examples are performance shirts, flags, mugs, tumblers, mouse pads, phone cases, coasters and some metal or hardboard blanks made with a sublimation coating.
Can you sublimate on dark items?
Generally no. Sublimation ink is translucent and cannot print white, so it will not show up well on dark colors. Light or white polyester gives the brightest result.
