Certifications 101: What ISO 10993, UL94, and Food-Contact Ratings Actually Mean

Certification claims on material datasheets are some of the most frequently misread specifications in additive manufacturing — not because engineers don't understand them, but because the claims are often narrower than they sound. This guide covers three of the most common certification families you'll encounter, and the questions worth asking before you take a claim at face value.

ISO 10993 (biocompatibility)

ISO 10993 is not a single certification — it's a multi-part standard covering biological evaluation of medical devices, and different parts apply to different exposure types and durations. A material listed as "ISO 10993 compliant" without specifying which parts, and for what contact duration and body location, is an incomplete claim.

UL94 (flammability)

UL94 rates how a material behaves when exposed to a flame — how quickly it self-extinguishes and whether it drips flaming particles. The common ratings, from most to least stringent among the vertical-burn classes, are V-0, V-1, and V-2. A material rated V-0 self-extinguishes faster and is less likely to drip flaming material than V-2.

• V-0: burning stops within 10 seconds after flame removal, no flaming drips permitted.
• V-1: burning stops within 30 seconds, no flaming drips permitted.
• V-2: burning stops within 30 seconds, flaming drips are permitted (but must not ignite a cotton indicator below the sample).

A critical detail: UL94 ratings are specific to a tested sample thickness. A material rated V-0 at 3mm is not automatically V-0 at 1.5mm — thinner sections can behave differently. Always check the thickness the rating was tested at against your actual wall thickness.

Food-contact compliance (FDA, EU 10/2011)

Food-contact claims in the US typically reference FDA regulations (commonly 21 CFR 177 for polymers), while EU claims reference Regulation (EU) No. 10/2011 on plastic materials intended to come into contact with food. These frameworks regulate the base resin's composition and migration limits — but AM introduces a wrinkle traditional manufacturing doesn't have to deal with as often: surface porosity.

A resin can be food-contact compliant in its raw form while a 3D-printed part made from it fails a practical food-safety review, because layer lines and micro-porosity can harbor bacteria in ways a smooth injection-molded surface doesn't. Post-processing (sealing, polishing, or an approved food-safe coating) is often required to make the finished part — not just the material — food-contact appropriate.

The general pattern

Across all three certification families, the same reading discipline applies: a certification claim describes a specific test, at a specific configuration, against a specific standard revision. The moment your application differs from that configuration — different thickness, different contact duration, different exposure — the claim needs re-evaluation, not blind trust.

This is why AM Navigator treats certifications as structured filters tied to the underlying datasheet language, rather than a simple badge — so the reasoning behind a certification match is visible, not just the checkmark.