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Every load we ship comes with a mill test certificate (MTC). Here's what each line on it means — and how to verify you're getting the spec you're paying for.
A mill test certificate is a document — issued for a specific production run — that reports the chemical and physical test results for that cement against a standard like ASTM C150-24 or AASHTO M85-24. It's how you prove, on paper, that the material meets the spec your project or plant requires.
If a supplier can't hand you an MTC, you're buying on trust alone. We include one with every shipment — from a single super sack to a full container.
Portland Cement Type I/II
Representative values from our mill test certificate. The actual, run-specific MTC ships with your order.
The Bogue compounds are the four main crystalline phases in Portland clinker. Their proportions decide how the cement sets, gains strength, and resists sulfates.
The main strength driver. Hydrates quickly and controls early set and 1–28 day strength. Most of a Type I/II cement is C3S.
Hydrates slowly and builds later-age strength (28 days and beyond). Contributes to long-term durability with lower heat.
Reacts fast and releases a lot of heat. Keeping C3A low is what gives Type II its moderate sulfate resistance — a key reason to check this line.
Contributes little strength but gives gray cement its color and lowers the clinkering temperature. Higher C4AF, darker cement.
Type I vs Type II in one line: Type I is general-purpose; Type II caps C3A (and heat) for moderate sulfate resistance. A Type I/II cement is manufactured to satisfy both — which is why it's the versatile default for most work.
Tell us the product, quantity, and destination and we'll send current documentation with your quote.
Lock today's landed price and secure a reliable second source — from one super sack to a full container.
