The 'Food Grade' Certification Trap in Stainless Steel
You order 1,000 stainless steel tumblers. The quote says "Food Grade Stainless Steel." The price is unbeatable. You feel like a negotiation genius.
Two weeks after distribution, employees complain that their coffee tastes metallic. Some cups are showing rust spots near the rim. What happened?
You likely received 201 Stainless Steel instead of 304 (18/8) Stainless Steel. Both look identical when new. But 201 has less nickel and more manganese. It is harder, but much less resistant to corrosion and acid (like coffee or fruit juice). It is cheaper for a reason.
In practice, this is often where Product Quality Assurance decisions start to be misjudged. "Food Grade" is a vague marketing term, not a technical specification.
The Fix: Never accept "Food Grade" as a spec. Specify "SUS304" or "18/8 Stainless Steel" in your contract. And here is the factory trick: Bring a magnet. 304 stainless steel is non-magnetic (or very weakly magnetic due to cold working). 201 is often magnetic. If the magnet sticks strongly to the inside of the cup, reject the shipment.
