PETG for face shields is decided by thickness and conversion method, not by resin brand. A converter producing 200,000 visors a month switched from 0.7 mm to 0.5 mm PETG to save material and started getting complaints about the visor curling at the brow. The thinner sheet formed faster, cooled faster and took a set where the foam header was stapled. The material was within specification; the process window had moved.
PETG is the default material for face shields because it is clear, tough, thermoformable and can be die-cut at speed. It is also a material whose performance depends heavily on thickness and conversion method, and both are usually decided by the converter rather than specified by the buyer.
PETG for face shields: thickness and conversion
0.5 mm is the lightest sheet that holds a stable curve on a full-face visor, and it is what most single-use products use. 0.7 mm gives a stiffer visor that resists curling and is the usual choice for reusable products. 1.0 mm is for heavy-duty or industrial visors where impact and repeated cleaning matter.
Below 0.4 mm the visor flutters and the optical surface distorts when the user turns their head. Above 1.2 mm the sheet is difficult to die-cut cleanly and the visor becomes heavy on the brow. For a certified product, the thickness on the test report should match the production sheet, because impact performance scales with it.
Optical clarity and the anti-fog decision
Standard PETG transmits around 90% of visible light with a slight blue tint at the edge. Optical grade with a lower haze reading is available and costs more. For a medical visor, haze matters because it affects the wearer view of a chart at 1 m; for an industrial splash guard, it matters less than impact.
Anti-fog is a coating or a laminated film, and it is the most common cause of a rejected batch because the coating can be damaged by the die-cutting process. If anti-fog is specified, cut before coating or use a coated sheet rated for the cutting method, and test a production sample in a humid chamber.
Cutting, edges and assembly
Die cutting is the volume method: a steel rule die with a 30° bevel and a soft anvil gives a clean edge at 0.5 to 0.7 mm. Laser cutting gives an accurate shape but leaves a slightly raised edge that can feel sharp against the face, so it is normally used for prototypes or low volume. Router cutting is used for thicker industrial visors.
The edge is where a visor fails inspection. A die-cut edge with a 0.2 mm lip will not seat in the foam header and the staple pulls through. Specify an edge quality and check ten pieces per lot against a gauge rather than by eye at arms length.
For medical or food-adjacent products, the resin has to be a grade with the relevant food-contact or biocompatibility documentation, and the sheet must not be regrind-blended without disclosure. Our note on PETG sheet with FDA food-contact status explains what the declaration has to state.
The production plan also has to account for thermoforming shrinkage: a formed visor pulls back 2 to 4% from the flat pattern, so the die is cut undersize relative to the finished shape. Converters who cut the die from the finished drawing get a visor that is small at the temple.
Send the visor drawing, thickness and monthly volume to oversales@rpplexiglass.com, and we will quote PETG sheet in the grade and thickness with the documentation your certification requires.
Frequently Asked Questions
What thickness PETG is used for face shields?
0.5 mm for single-use visors, 0.7 mm for reusable full-face visors and 1.0 mm for industrial heavy-duty shields. Below 0.4 mm the visor flutters and distorts; above 1.2 mm die cutting becomes difficult.
Is PETG clear enough for a medical face shield?
Yes. Standard PETG transmits around 90% of visible light with low haze, and optical grades are available where a lower haze figure is needed. Check the haze value on the certificate rather than relying on a visual sample.
Can PETG face shields be laser cut?
They can, but laser cutting leaves a slightly raised edge that may feel sharp and can affect the anti-fog coating. Die cutting is the standard for volume production, and laser is normally reserved for prototypes or short runs.