Adhesive Powder
The hot-melt polymer grain that fuses the ink layer to the garment during press, sold in fine and coarse grades because the right choice depends on the art and the fabric.
Short version, straight from the floor.
Adhesive powder is a thermoplastic polymer, usually a modified polyamide or polyurethane, ground to a controlled grain size. Right after the ink prints on the film, the sheet passes through a shaker unit that lays powder onto the wet ink and then vibrates the excess off. The powder that stays becomes the layer that melts under press heat, wets into the fabric fibers, and cools into a bond that survives 60 washes.
Buying bulk powder off marketplaces without a data sheet. Cheap powder is cut with talc, dust, and irregular grade. It looks identical to good powder in the container and destroys transfers in wash. If your supplier will not send a melt-point spec sheet and a particle-size distribution, they do not know what they are selling. Walk away.
Storing powder in a humid shop. Adhesive powder is hygroscopic. If it gets damp it clumps, and the shaker unit deposits uneven amounts of powder on each sheet. That is why some of your transfers hold and others peel. Store sealed, indoor, climate-controlled.
Skipping the cure oven and going straight to press. The powder needs to be fully melted and bonded to the ink layer before it ever sees the shirt. Some low-budget shops try to combine cure and press in one platen cycle. It does not work; the cure temperature is too high for a garment. Cure oven, then press. Two steps.
Ignoring which grade is on the roll. If your shop runs both grades and does not label the shakers, you will end up with fine powder on a hoodie back and coarse powder on a small chest print. Label the equipment, log the grade on the job ticket.
A production-floor definition, not a spec-sheet lift.
Adhesive powder is a thermoplastic polymer, usually a modified polyamide or polyurethane, ground to a controlled grain size. Right after the ink prints on the film, the sheet passes through a shaker unit that lays powder onto the wet ink and then vibrates the excess off. The powder that stays becomes the layer that melts under press heat, wets into the fabric fibers, and cools into a bond that survives 60 washes.
Grain size decides two things. Fine powder holds the definition of small type and thin strokes because the grain is smaller than the details in the file. Coarse powder gives a softer hand and grips heavier fabric like fleece, at the cost of a slightly rougher edge on 8-point type. Neither is universally better. Fine is right for the detailed photograph. Coarse is right for the oversized back print with bold shapes.
Golden DTF stocks both and picks the grain by job. Custom transfers under 6 inches with fine linework get fine powder. Oversized back prints, hoodie chest prints, and jobs on heavy fleece get coarse. When we run gang sheets we default to fine because gang sheets always contain some detailed art. If you want a specific grain called out for your job, tell us at intake.
Bad powder is a real problem. Cheap suppliers cut grade with dust and irregular particle size. That looks fine dry, but under press heat the fine dust burns off before it bonds and the irregular grain leaves gaps in the adhesive layer. The transfer looks fine on day one and starts flaking on wash 10. We buy the same TPU powder every month, from the same industrial supplier in the US, and we sieve it in-house.
Every field you need before the press cycle starts.
The numbers below come from our own production floor, not a supplier tech sheet. If a field says 305 F, it is because we press at 305 F and it works. If a field says "avoid on tri-blend," it is because we ruined a run and stopped doing it.
Fine grade
- Particle size
- 80 to 200 microns
- Melt point
- 220 to 240 F, full bond at 300 F under pressure
- Hand feel
- Firm; preserves file detail
- Best for
- Fine linework, small type, photorealism, detailed CMYK on cotton and blends
- Deposit rate
- Approx 60 to 90 g/m² depending on ink coverage
Coarse grade
- Particle size
- 250 to 400 microns
- Melt point
- 220 to 240 F, full bond at 300 F under pressure
- Hand feel
- Softer, more textile-like on fleece and tri-blend
- Best for
- Oversized back prints, hoodie fronts, bold shapes, heavy fleece, cotton
- Deposit rate
- Approx 100 to 140 g/m² depending on ink coverage
Behavior on garment
- Fabric compatibility
- All fabrics; coarse preferred on fleece and heavy weights
- Wash durability
- 60-plus washes at 30 C standard care, both grades
- Stretch tolerance
- Both grades flex; coarse marginally stiffer on very small designs
- Common failure mode
- Under-cured powder = transfer peels at wash 12. Over-cured = brittle bond that cracks in wash.
Cost & workflow
- Cost per unit at volume
- Included in transfer price; grain selection has no line-item cost
- Cure step
- Sheet passes through 320 F cure oven for 90 seconds to fully melt and bond powder to ink
- Storage
- Sealed containers, cool and dry; powder is hygroscopic and will clump with moisture
What this is designed to run next to.
Every pairing below is one we set on the press ourselves. If a substrate or transfer type is not here, it is either wrong for this material or we have not proven it enough to publish.
Best-with films
Best-with ink layers
Where this is the wrong tool, and what to reach for instead.
You want a completely no-hand feel.
Adhesive powder is what gives DTF transfers their body. No powder equals no bond. If your line requires near-zero hand, DTF is the wrong method. Screen print with a discharge white on cotton is the closer answer.
Fine grade on a heavy fleece hoodie.
Fine grade lays a thin adhesive layer that can get pushed into the fleece pile by press pressure and lose bond area. Use coarse grade on anything heavier than a midweight tee.
Use Coarse grade insteadCoarse grade on 6-point type.
The powder grain is comparable to the stroke width of small type. Bond gaps appear inside the letters and the type looks fuzzy. Use fine grade on any text under 10 points.
Use Fine grade insteadThe failures we watch shops repeat every week.
Buying bulk powder off marketplaces without a data sheet.
Cheap powder is cut with talc, dust, and irregular grade. It looks identical to good powder in the container and destroys transfers in wash. If your supplier will not send a melt-point spec sheet and a particle-size distribution, they do not know what they are selling. Walk away.
Storing powder in a humid shop.
Adhesive powder is hygroscopic. If it gets damp it clumps, and the shaker unit deposits uneven amounts of powder on each sheet. That is why some of your transfers hold and others peel. Store sealed, indoor, climate-controlled.
Skipping the cure oven and going straight to press.
The powder needs to be fully melted and bonded to the ink layer before it ever sees the shirt. Some low-budget shops try to combine cure and press in one platen cycle. It does not work; the cure temperature is too high for a garment. Cure oven, then press. Two steps.
Ignoring which grade is on the roll.
If your shop runs both grades and does not label the shakers, you will end up with fine powder on a hoodie back and coarse powder on a small chest print. Label the equipment, log the grade on the job ticket.
Materials this is often confused with.
The grain gets chosen by the job, not by the discount.
Every Golden DTF transfer runs on the powder grade that matches the art, the fabric, and the press cycle. If you want a specific grade called out on your order, note it at intake and we log it on the ticket.