White Portland cement (heading 252321) is produced from raw materials with very low iron and manganese content, yielding a white finished product used in architectural and decorative applications. Gray Portland cement under 252329 contains higher iron oxide levels and is the standard structural grade. The distinction is based on the manufacturing process and raw material specification, not simply color; importers should obtain mill certificates confirming the cement type to support classification.

The US has maintained antidumping duty orders on Portland cement from specific countries at various times. Before entering into a supply contract with a new foreign mill, importers should check the current scope of any active AD/CVD orders with the International Trade Administration and confirm whether the prospective supplier has an established individual dumping margin or is subject to the all-others rate. Failure to deposit the correct AD duty at entry can result in significant retroactive liability after administrative review.