At Parts on Demand, we use a material that is food contact approved: PA 12. One catch: PA 12 is white, whereas in the world of food processing, parts are preferably blue. So, we developed an FDA approved dye and process.
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But most dyes use chemicals making them unsuitable for food contact. Which means the untreated, white part is approved, but once it is colored it no longer is. Post-processing your parts to seal the surface, does not get them FDA approved.
That is why we developed a color and a process which are both FDA approved: your part, 3D printed, fully approved for food contact. The process, the material, and the dye. Tested and certified to be used according to EC 1935/2004. Certification for FDA 21 CFR, §175.300 and §177.1500 is pending.
Resulting in parts that are suitable for food contact, with the appropriate approval.