PET Carrier Film
The polyethylene terephthalate substrate that everything else in DTF is built on top of, the film every hot-peel and cold-peel sheet begins as before it gets its release coating.
Short version, straight from the floor.
PET carrier film is a thin, dimensionally stable sheet of polyethylene terephthalate, the same polymer family as a soda bottle, extruded into a smooth, transparent, heat-tolerant substrate. In DTF, the PET carrier is the surface the printer lays ink onto and the surface that carries the ink through the powder application, the cure oven, and the final press onto the garment. Every other material in DTF is either laid on this film or interacts with it.
Assuming all PET is DTF-compatible. The industrial PET market includes food-grade, medical-grade, and packaging-grade films that share the polymer but not the coating. If a supplier is selling you 'PET film' without specifying DTF release-coating and release-behavior specs, they are selling you the wrong SKU.
Storing rolls upright and letting them sag. PET is stable at short heat cycles but takes a set under long-term load. Rolls stored on end for months develop an oval cross-section that jams shaker feeds. Store flat, on their side, on a shelf.
Printing on the wrong side. The coated print side has a slight sheen difference from the uncoated back. Operators new to DTF sometimes load rolls upside down. First test the print pass on a 4-inch strip before running a job; if ink beads instead of laying flat, flip the roll.
Blaming the PET when the coating is the variable. If two rolls from the same manufacturer peel differently, it is a coating tolerance issue on their end, not a PET issue. Escalate to the supplier with a lot number.
A production-floor definition, not a spec-sheet lift.
PET carrier film is a thin, dimensionally stable sheet of polyethylene terephthalate, the same polymer family as a soda bottle, extruded into a smooth, transparent, heat-tolerant substrate. In DTF, the PET carrier is the surface the printer lays ink onto and the surface that carries the ink through the powder application, the cure oven, and the final press onto the garment. Every other material in DTF is either laid on this film or interacts with it.
The PET itself is inert. The behavior differences you experience day-to-day come from what is coated onto the PET, not from the polymer. The coating is the release layer, and the release layer decides whether the film peels hot or cold, glossy or matte, at 30 F versus at 100 F. This is why the industry sells 'hot-peel' and 'cold-peel' as separate SKUs even though both start as identical 75-micron or 100-micron PET rolls.
Thickness matters more than most shops think. A 75-micron PET (roughly 3 mil) is the standard hot-peel weight, thin enough to release quickly and cheap enough to ship in bulk. A 100-micron PET (roughly 4 mil) is common for cold-peel because the extra body holds the ink flat during the longer cool-down. Thicker than 100 microns gets stiff enough to fight through the shaker unit and slows production.
You do not order raw PET as a customer. It arrives on our floor already coated. But if you are diagnosing a peel problem, understand that the PET is the constant and the coating is the variable. If your peel behavior changes between rolls from the same supplier, the coating tolerance slipped, not the PET.
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.
Physical
- Polymer
- Polyethylene terephthalate (PET)
- Standard thickness
- 75 microns (hot-peel), 100 microns (cold-peel)
- Heat tolerance
- Withstands 350 F short-cycle without warping
- Dimensional stability
- Shrinkage under 0.5% at 300 F for 12 seconds
- Surface
- Smooth uncoated side + release-coated print side
In DTF workflow
- Role
- Substrate that carries ink through the entire pre-press workflow
- Print side
- Coated, receives white underbase and CMYK ink
- Non-print side
- Uncoated; contact side against the shaker platen and press platen
- Release variants
- Hot-peel coating, cold-peel coating, matte, glossy
- Recyclability
- PET is technically recyclable; the release coating and residual ink make used carrier non-recyclable in most municipal streams
Compatibility
- Ink compatibility
- DTF pigment inks, water-based; not compatible with solvent or eco-solvent inks without different coating
- Powder compatibility
- All standard DTF adhesive powders (fine and coarse TPU)
- Cure temperature
- Handles 320 F cure oven cycles indefinitely
- Press temperature
- 300 to 320 F for standard cotton press; substrate itself is inert at these temps
Failure modes
- Warped or curled PET
- Ink registration drifts, edges pull off the platen. Usually caused by humid storage.
- Wrong side printed
- Uncoated side receives ink; ink beads up, print fails
- Overheated PET
- Sheet distorts above 350 F sustained; rare in DTF but possible with a stuck cure conveyor
- Reused carrier
- The release coating is consumed after one press cycle
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 coatings
Best-with ink layers
Best-with adhesive
Where this is the wrong tool, and what to reach for instead.
You are running solvent or eco-solvent ink.
Standard DTF PET is coated for water-based pigment ink. Solvent inks require a different coating chemistry. This is a printer-tech decision, not a substrate choice; consult your equipment vendor.
You want to reuse a carrier sheet.
PET itself would survive. The release coating does not. Once the coating has been consumed in a press cycle, the film is a finished-goods scrap material. Reusing it will scorch the garment and fail to transfer ink.
You are trying to make a heat-transfer label without release coating.
Bare PET is not a DTF substrate. Without the correct release coating the ink will lift with the film during peel. This is not a DIY improvisation, use finished hot-peel or cold-peel sheets.
The failures we watch shops repeat every week.
Assuming all PET is DTF-compatible.
The industrial PET market includes food-grade, medical-grade, and packaging-grade films that share the polymer but not the coating. If a supplier is selling you 'PET film' without specifying DTF release-coating and release-behavior specs, they are selling you the wrong SKU.
Storing rolls upright and letting them sag.
PET is stable at short heat cycles but takes a set under long-term load. Rolls stored on end for months develop an oval cross-section that jams shaker feeds. Store flat, on their side, on a shelf.
Printing on the wrong side.
The coated print side has a slight sheen difference from the uncoated back. Operators new to DTF sometimes load rolls upside down. First test the print pass on a 4-inch strip before running a job; if ink beads instead of laying flat, flip the roll.
Blaming the PET when the coating is the variable.
If two rolls from the same manufacturer peel differently, it is a coating tolerance issue on their end, not a PET issue. Escalate to the supplier with a lot number.
Materials this is often confused with.
You do not order the substrate, you order what we build on it.
Every Golden DTF transfer starts as coated PET from a supplier we have run for years. If you want to know the exact media on your order, we will send the roll lot number with the shipment.