Key Takeaways
- FDA 21 CFR 175-178 Applies: Materials contacting food must comply with FDA indirect food additive regulations.
- Stainless 304/316 is GRAS: Generally recognized as safe for food contact.
- Surface Finish Matters: #4 finish (brushed) is standard for food equipment.
- Welds Must Be Polished: No crevices or pits that could harbor bacteria.
- Migration Testing Required: EU regulations require migration testing per EN 1186.
Table of Contents
Food-Grade Requirements
A wheat storage facility in Australia failed their annual food safety audit because the carbon steel silo interior had surface rust. We applied FDA-approved food-grade epoxy coating and implemented annual inspection protocols. The facility has maintained certification for 8 years since the upgrade.
Stainless Steel for Food Silos
Surface finishes: #2B (cold-rolled), #4 (brushed, most common), #8 (mirror), Electropolished (hygienic). All welds ground smooth and polished to match parent metal.
Food-Grade Coatings
FDA 21 CFR 175.300 compliant epoxy coatings provide smooth finish, chemical resistance, and corrosion protection for carbon steel food silos.
Design for Hygiene
Sloped surfaces prevent water pooling. No internal ledges. Self-draining design. CIP system compatibility.
Frequently Asked Questions
Q: Can I use carbon steel for food storage?
A: Yes, with FDA-approved food-grade coatings. However, stainless steel is preferred for direct food contact and easier cleaning.
Need food-grade silo design? Manxing has designed grain and food processing silos worldwide. Request Food-Grade Consultation