Food Safe Epoxy: What Does It Really Mean?

Food Safe Epoxy: What Does It Really Mean?

When an epoxy coating or adhesive is described as food safe, it does not mean the liquid epoxy is edible or harmless. It generally means that the properly mixed and fully cured material is suitable for a specific type of food contact application under defined conditions.

Food Safe vs. FDA Compliant

The terms “food safe,” “food grade,” and “FDA approved” are often used interchangeably, but they do not necessarily mean the same thing.

For food contact materials, the important question is whether the ingredients and finished material are suitable for the intended conditions of use under applicable FDA requirements.

For epoxy adhesives and coatings, two important U.S. regulations are:

• 21 CFR 175.105, Adhesives: Covers certain adhesives used as components of articles intended for packaging, transporting, or holding food.

• 21 CFR 175.300, Resinous and Polymeric Coatings: Covers certain coatings intended for food-contact surfaces, subject to specified compositions, limitations, and conditions.

Other sections of 21 CFR Parts 174–178 or FDA Food Contact Notifications may also apply, depending on the formulation and application.

Why the Application Matters

An epoxy suitable for one food contact application is not automatically suitable for every application.

Food-contact requirements can depend on factors such as the type of food, contact time, temperature, and whether the application involves repeated use. Contact with dry food at room temperature, for example, is very different from prolonged contact with hot, acidic, alcoholic, or fatty foods.

Full Cure Is Essential

Food-contact suitability applies to the finished, properly cured material, not to uncured resin or hardener.

The correct mixing ratio, application procedure, cure time, and cure temperature must be followed. An epoxy may feel hard before it has reached its required full cure.

What Should You Look For?

Instead of simply asking, “Is this epoxy food safe?” ask:

“Is this epoxy suitable for my specific food contact application, and what FDA regulation or other authorization supports that use?”

A responsible manufacturer should be able to explain the product’s intended food-contact use, required cure conditions, and applicable regulatory basis.

The Bottom Line

Food safe does not mean edible. For epoxy coatings and adhesives, it generally means that the properly formulated and fully cured material is suitable for its specified food contact use under applicable requirements.

For U.S. applications, 21 CFR 175.105 is particularly relevant to certain adhesives, while 21 CFR 175.300 is important for certain resinous and polymeric coatings.

Always check the product’s technical information and intended conditions of use before using an epoxy where direct or indirect food contact is expected.