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Plant-floor overview. Unlock below for the full converter checklist.
Moisture and water — #8244E
MVTR (TAPPI 464, 100°F / 90% RH) is grams per 100 in²/day or g/m²/day. Lower is better. Water resistance is Cobb (g/m² over 10 minutes). You need a continuous, pinhole-free coating. Variables: porosity, smoothness, and density of the base stock; total coat weight; number of coats.
On porous kraft, MVTR falls as coat weight rises. Excellent Cobb (<1) can show at lower coat weight than excellent MVTR. Multiple coats of 8244E can improve MVTR at the same total coat weight (primer then overcoat). Smoother, less porous stocks (machine-glazed kraft, free sheet) yield better MVTR than SBS or kraft liner at the same coat weight.
Grease and oil — #8769 and #8768
Same need for a pinhole-free film. Tests: TAPPI UM 557 grease-kit and TAPPI turpentine. Kit values greater than 7 are a very good grease barrier. Two coats of 8769 develop an excellent grease barrier at lower total coat weight than one coat. 8769 and 8768 work across base stocks depending on how much is applied.
Related: Barrier Coatings.
Longer plant training (5–10 min)
Coming soon — downloadable deep-dive for the floor.
General plant guidance only — not a substitute for your process, SDS/TDS, or line trials. Call 800-249-0337 to match a grade.