Sublimation · Hard Blanks
Sublimation Phone Case Temperature & Time
Phone cases are a top seller and a fast sublimation blank — but "phone case" covers flat hard cases, metal-insert cases, and fully curved 3D cases, and each presses differently. Here are the starting points and the one detail that decides which method you even can use.
Quick answer
A common starting point for a sublimation phone case is 385–400°F (196–204°C) for about 50–70 seconds with medium pressure and a foam pad for even contact. Flat hard cases and metal-insert cases press in a standard flat heat press; fully curved 3D cases need a vacuum sublimation oven. Coatings vary, so always test one case first and log it.
Phone case settings by type
| Case type | Temp | Time | Method |
|---|---|---|---|
| Flat hard case | 385–400°F | 50–70 s | Flat press |
| Metal-insert case sublimate the plate | 385–400°F | ~60 s | Flat press |
| Curved / 3D case | ~380–400°F | per oven guide | 3D vacuum oven |
Common starting points (°C: ~193–204°C). Plastic cases have a narrow window — overshoot warps them.
First, identify your case type
Before any settings matter, figure out which of three cases you have, because it decides your method. A flat hard case has a coated flat back you press directly in a flat heat press. A metal-insert case is a snap-together case where you sublimate a flat aluminum or poly plate and then click it into the case — you are really just pressing a small flat panel. A fully curved 3D case wraps around the phone's edges; a flat press can only touch the center, so these require a 3D vacuum sublimation oven that hugs the whole surface. Trying to flat-press a curved case is the number-one reason beginners get a sharp image in the middle and nothing on the sides.
Flat and metal-insert cases
For flat hard cases and metal inserts, press at 385–400°F for roughly 50–70 seconds at medium pressure. Print mirrored, trim and tape the transfer so it cannot shift, and use a heat-resistant foam pad so the platen makes even contact. Metal inserts are the most forgiving option of all — they behave like any flat aluminum blank, give vivid color, and you never expose the plastic case to heat at all, so there is no warping risk.
Mind the plastic
Plastic cases have a narrower safe window than ceramic or metal. Too cool or too short and the image is faint; too hot or too long and the case can yellow, soften, or warp out of shape. If your result is faded, nudge time up a little before temperature. If you see browning or distortion, back the heat off. This is exactly why a one-case test press matters — you are calibrating to a specific plastic, not a universal number.
Color, contrast, and coating
Like all sublimation, a phone case is only as vivid as its polymer coating. A well-coated case produces rich, sharp color; a cheap or thin coating looks washed out no matter how long you press. White or light cases show colors best. Dark areas of your design always read more strongly than pale ones, so high-contrast artwork tends to look best on a case-sized print.
Troubleshooting phone cases
- Faded image: add time first, then temperature — or the coating is low quality.
- Yellow / brown tint or warping: too hot or too long. Reduce heat and re-test on plastic.
- Sharp center, blank edges: you flat-pressed a curved case. Use a metal insert or a 3D oven.
- Ghosted / blurry image: the transfer moved or you re-pressed. Tape it and lift straight up — see our ghosting fix.
Cases sell in many phone sizes and case styles, so the second you land a clean recipe for one type, write it down. A logged "385°F, 60s, medium, foam pad" turns the next order into a routine press instead of a re-test.
Frequently asked questions
What temperature do you sublimate a phone case? +
A common starting point for a sublimation phone case is 385–400°F (196–204°C) for about 50–70 seconds with medium pressure. Metal-insert cases (where you sublimate a flat aluminum plate that snaps into the case) often press at the lower end for around 60 seconds. Always test one case first.
Why is my phone case sublimation faded or yellow? +
Faded color usually means too little time or temperature, or a low-quality coating. Yellowing or a brownish tint usually means too much heat or time scorching the coating. Adjust in small steps and test, and remember plastic cases have a narrow window before they warp.
Can you sublimate a curved or 3D phone case? +
Flat-back hard cases and metal-insert cases press easily in a flat heat press. Fully curved or wrap-around 3D cases need a 3D vacuum sublimation oven to make even contact on the curves — a flat press cannot reach the sides. Check what type of case you have before choosing a method.
How much pressure for a sublimation phone case? +
Medium pressure is a good starting point for hard cases and metal inserts. Use a heat-resistant foam pad under or over the case so the platen makes even contact, and avoid clamping too hard on thin plastic cases, which can warp or crack under high pressure.