The best shirt for infusible ink is a white or light-coloured 100% polyester shirt. Infusible ink dye bonds with polyester fibers under heat, producing a permanent print that does not crack or peel. Poly-blend shirts work if polyester content is 65% or higher, but print quality and durability drop as polyester percentage drops. Dark shirts and 100% cotton shirts do not work for direct infusible ink transfers.
Infusible Ink is a transfer method that bonds dye directly into compatible fabric fibers using heat and pressure. Because the dye becomes part of the fabric rather than sitting on top of it, the design does not crack, peel, or fade the way iron-on transfers can. Getting the best result depends almost entirely on choosing the right shirt. This guide explains which fabrics work, which do not, and what happens at each polyester percentage so you can make the right choice before you start.
The polyester content of the shirt is the single most important factor in how well infusible ink transfers and how long the result lasts. Use this table to check whether a shirt will work before you buy it.
| Fabric Composition | Print Quality | Durability | Recommended? |
|---|---|---|---|
| 100% Polyester | Sharp, full colour, accurate tones | Permanent. Lasts the life of the shirt. | Yes. Best choice. |
| 80%+ Polyester blend | Good quality, close to 100% poly | Very durable. Slight softness from blend. | Yes. Good choice. |
| 65/35 Polyester-Cotton | Faded, washed-out appearance | Fades after several washes | Acceptable if nothing else is available |
| 40/60 Polyester-Cotton | Very faded, barely visible | Disappears after about 3 washes | Not recommended |
| Tri-blend (60%+ poly) | Depends on poly content | Durable if polyester is majority | Acceptable if poly is 60%+ |
| 100% Cotton | Ink does not bond | Print will not transfer | Do not use |
| Dark-coloured shirts (any fabric) | Ink is invisible on dark fabric | N/A | Do not use |
Infusible Ink is a transfer product that bonds dye permanently into compatible polyester or polymer-coated fabric using a heat press or EasyPress. When heat is applied, the solid dye converts to gas and infuses directly into the fabric fibers. The result is a design that feels like part of the fabric, with no raised texture and no layer sitting on the surface. The design will not crack, peel, or tear off with normal use and washing.
You can use Infusible Ink in two forms: pre-printed transfer sheets or Infusible Ink pens and markers. Transfer sheets come with the design already printed and ready to cut and weed. Infusible Ink pens let you draw or colour a design directly onto copy paper, which is then transferred to the shirt using a heat press.
Follow these steps when using pre-printed infusible ink transfer sheets on a polyester shirt.
Using the correct temperature, time, and pressure is critical. Too low and the ink does not fully transfer. Too high and the fabric may scorch.
| Fabric | Temperature | Time | Pressure |
|---|---|---|---|
| 100% Polyester | 385 to 400°F (195 to 205°C) | 40 to 60 seconds | Firm |
| 80%+ Polyester blend | 385 to 400°F | 40 to 60 seconds | Firm |
| 65/35 Polyester-Cotton | 385°F | 40 seconds | Firm |
Always use butcher paper between the transfer sheet and the heat press plate, and between the design area and the back layer of the shirt. This prevents ink from bleeding through or staining the press plate.
Infusible Ink pens and markers give you the option to draw or colour a design by hand rather than using a printed transfer sheet. You draw or colour your design onto a piece of copy paper using the infusible ink markers. Once the design is complete, you transfer it onto the polyester shirt using a heat press the same way you would a transfer sheet.
The same fabric rules apply. Pens and markers only work on polyester or polyester-blend fabrics with a high polyester content, and only on white or light-coloured shirts. The ink still needs polyester fibers to bond with under heat.
A 100% polyester white shirt gives the best results with infusible ink. The polyester fibers are the only material that chemically bonds with infusible ink dye when heat is applied. On a 100% polyester shirt, the dye transfers completely, the colours are fully accurate, and the print is permanent.
When 100% polyester is not available, look for a shirt with more polyester than any other fiber. A 20/80 cotton-polyester blend gives better results than a 50/50 blend. A white or very light-coloured shirt will always produce better results than a coloured shirt because the dye is transparent and shows correctly on a light background.
Use white or very light-coloured shirts for infusible ink. The dye is transparent. On a white shirt, the dye produces the full intended colour. On a coloured shirt, the shirt colour mixes with the dye and distorts the result. The darker the shirt, the less visible the design.
Infusible ink does not work on 100% cotton. The infusible ink process requires polyester fibers for the dye to bond with under heat. Cotton fibers do not have the right chemical structure to accept the ink. Pressing infusible ink onto a cotton shirt will produce a very faded or invisible result that will wash out almost immediately.
If you want to apply infusible ink to a cotton shirt, you can use a Cotton Infusible Ink Solution spray. This spray creates a polyester-like coating on the fabric surface that allows the ink to transfer. However, the print quality and durability will not be as strong as on a true polyester shirt. Spray the area lightly with a fine mist, let it dry completely, and then transfer the infusible ink design.
Infusible ink does not work directly on dark-coloured shirts. The dye is transparent, so on a dark fabric it is invisible after pressing. The design simply does not show against the dark background.
One workaround is to apply white heat transfer vinyl (HTV) to the dark shirt first as a base layer. The infusible ink design is then pressed onto the white HTV layer, where it shows up clearly. This requires applying the HTV first following standard HTV pressing instructions, then pressing the infusible ink design onto the white HTV surface.
The dark shirt workaround using white HTV as a base layer produces results that hold up differently than a direct polyester transfer. The design sits on the HTV layer, not directly in the fabric fibers, so long-term durability is more similar to standard HTV than to a true infusible ink transfer.
Infusible ink designs are significantly more durable than iron-on transfers, but correct washing still matters.
The best shirt for infusible ink is a white 100% polyester shirt. The polyester fibers bond permanently with the infusible ink dye under heat, producing a print that will not crack, peel, or fade. Light-coloured poly-blend shirts with 65% polyester or higher also give acceptable results. Avoid cotton-heavy blends and dark shirts for direct infusible ink transfers.
Press at 385 to 400 degrees F for 40 to 60 seconds with firm pressure. Use butcher paper to protect the press plate, pre-press the shirt to remove moisture, and insert cardstock between the shirt layers before pressing.
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