Sublimation
Sublimation Temperature for Polyester
The short answer: a common starting point for polyester is 385–400°F (195–205°C) for 40–60 seconds with light to medium pressure. But the right number depends on how much polyester is in the fabric — here is the full breakdown by blend.
Quick answer
A common starting point for polyester is 385–400°F (195–205°C) for 40–60 seconds with light-to-medium pressure. Thin, stretchy performance or athletic polyester scorches easily, so drop to 350–375°F. The higher the polyester content, the brighter and more wash-fast the print — always test on a scrap of the same fabric first.
Sublimation temperature by polyester content
| Fabric / polyester content | Temp | Time | Pressure |
|---|---|---|---|
| 100% polyester (standard tee) | 385–400°F (195–205°C) | 40–60 s | Light–medium |
| Performance / athletic poly thin, stretchy, heat-sensitive | 350–375°F (175–190°C) | 45–60 s | Light |
| Poly-cotton blend (50/50+) vintage / faded look | 385–400°F | 40–60 s | Light–medium |
| Polyester-coated hard blanks coasters, signs, panels | 380–400°F | 60 s | Medium |
Values are common starting points. °C shown where commonly cited; convert and verify against your own equipment.
Why polyester content decides the temperature
Sublimation works by turning solid dye into gas under heat, then bonding that gas permanently into polyester or a polymer coating. It cannot bond to natural fibers like cotton. That single fact explains almost everything about pressing polyester: the more polyester the fabric contains, the more places the dye has to lock into, and the brighter and longer-lasting the print. A 100% polyester shirt gives you the boldest, most wash-fast color. A 50/50 poly-cotton blend prints lighter and softer on purpose — the cotton half stays blank, which is exactly how the popular "vintage" sublimation look is made.
Temperature and time are the two dials you control. For most polyester fabric a starting point of 385–400°F (195–205°C) for 40–60 seconds with light to medium pressure does the job. The exception is thin, stretchy performance polyester, which scorches and yellows long before a sturdy cotton-feel poly tee would — so you drop the heat instead of chasing it.
Standard 100% polyester shirts
Set 385–400°F for 40–60 seconds with light to medium pressure. Pre-press the blank for a few seconds first to drive out moisture and flatten the surface — trapped steam is a common cause of patchy transfers. Use a sheet of butcher or parchment paper above and below the transfer to catch any gas-out and protect the platen. Press firmly enough for full contact, but not so hard that you crush the fabric texture or leave a press box around the design.
Performance and athletic polyester
Moisture-wicking jerseys, leggings, and thin athletic wear are still polyester, but they are far more heat-sensitive. At a full 400°F they can scorch, yellow, or take on a shiny press mark. Start lower — around 350–375°F (175–190°C) — keep the pressure light, and use a pressing pillow so the heat wraps the fabric evenly instead of pressing seams and hems into the print. If you see any yellowing on a white scrap, drop the temperature before you touch the real garment.
Poly-cotton blends
You can sublimate a blend, but set your expectations with the polyester percentage. A 65/35 or 50/50 blend will hold the dye only in its polyester fibers, so colors look muted and slightly washed from the moment you peel — that is the intended vintage effect, not a mistake. The press numbers stay roughly the same as a 100% poly tee (385–400°F, 40–60 seconds), but the lower the polyester content, the lighter the result, and the more the print will continue to soften over many washes.
Common polyester mistakes (and the fix)
- Faded or pale colors on 100% poly: usually not enough time, heat, or pressure. Add a little of one variable and retest.
- Yellow or scorched fabric: too hot or too long for that blend — especially on thin athletic poly. Lower the temperature and shorten the time.
- Shiny press box around the design: too much pressure or a hard platen edge. Use a pressing pillow and lighter pressure.
- Ghosting / blurry edges: the transfer shifted, or you lifted while it was still gassing. Tape it down and lift cleanly.
The fastest way to stop repeating these is to change one variable at a time and write down the version that looked right — the exact fabric and supplier, the polyester percentage, the printer, the time, the temp, and the pressure. That single habit is what lets you reproduce a perfect polyester press on demand instead of re-testing every order.
Frequently asked questions
What temperature do you sublimate polyester? +
A common starting point for polyester fabric is 385–400°F (195–205°C) for 40–60 seconds with light to medium pressure. Heat-sensitive performance or athletic polyester often presses cooler, around 350–375°F. Always test on a scrap first, since presses and poly blends vary.
Can you sublimate 100% polyester and poly blends? +
Sublimation only bonds to polyester or a polymer coating, so the higher the polyester content, the brighter and more durable the result. 100% polyester gives the boldest colors. A 50/50 poly-cotton blend will sublimate but looks lighter and more vintage, because the dye cannot bond to the cotton fibers and washes out of them over time.
Why is my polyester scorching or turning yellow? +
Yellowing or scorch marks usually mean the temperature or time was too high for that fabric. Thin, white, or stretchy performance polyester scorches easily, so drop to 350–375°F and shorten the time. A pressing pillow and a cover sheet also help spread the heat and prevent press lines.
Is the temperature higher or lower than hard blanks? +
They are close. Polyester fabric and most polymer-coated hard blanks both sit around 380–400°F, but fabric presses for a shorter time (40–60 seconds) while curved items like mugs and tumblers need minutes. Match the temperature to the blank and adjust the time, then record the combination that worked.