Written for paint formulators, plant QC engineers, procurement managers and logistics coordinators. No fluff, no "top 10" filler. Practical notes from a working trade desk.
Primary aluminum ingot is sold by purity, and the A7 and A8 grade names carry specific silicon and iron ceilings. How A7 relates to P1020A and Al99.70, which form to order, and what the specification should say.
All five ASTM B6 zinc grades with their zinc minimum and their lead, cadmium, iron and tin maximums, mapped to EN 1179 and ISO 752 names. What to write on the order so the chemistry is unambiguous.
Zinc ingot is sold by purity, and the same grade carries a different name in ASTM B6, EN 1179 and on the LME. The grades from 99.995% down to 98.5%, what each impurity limit protects, and what to write on the purchase order.
How particle size (2 to 6 µm) and particle shape (spherical vs flake) drive the choice between paints, electroplating, pharmaceutical chemistry and Geomet / Dacromet coatings.
Total zinc, metallic zinc, sieve residue, Pb / Cd / Fe / As / Cl limits. A walk-through of every line on a CoA, written for buyers and QC engineers.
When each rule actually saves you money, when it costs you, and what to ask your freight forwarder before signing the pro forma.
What dry-film zinc loading you actually need, why the binder choice gates everything, and how Fine Flake changes the math.
European and Asian buyers reference ISO 3549. North American spec sheets often quote ASTM D520. Here is how the two compare.
Zinc dust is moisture-sensitive and combustible at fine particle sizes. A short, practical guide to keeping your inventory on-spec from delivery to formulation.
