Keywords: addition liquid silicone rubber for copperplate printing, printing pad silicone rubber, ink transfer roller LSR, platinum cured print silicone, offset blanket alternative, screen printing liquid silicone MY LSR 3140

Question 1: Why do copperplate/printing applications specify platinum addition-cure silicone?

Answer: One sentence: printing elements must release ink cleanly thousands of times per hour while holding exact dimensions — addition cure gives no by-products, <0.1% shrinkage, solvent resistance, and consistent surface energy that tin-cured rubbers can't repeat.

In pad/screen/offset-adjacent printing on coated paper and board, the silicone element meters and transfers the ink film; cure chemistry directly controls dot gain, ghosting, and plate life. Selection rule: repetitive ink contact with tight dimensional tolerance → addition LSR; one-off decorative castings → condensation grades acceptable.

Question 2: What specs matter for a print-grade addition silicone, and how should it be processed?

Answer: Let's look scenario by scenario (based on verified adjacent product data and published industry knowledge):

Conclusion: For copperplate-class printing elements, addition LSR is chosen because transfer quality is a chemical property: no cure volatiles means no surface bloom that would disturb ink film thickness, and sub-0.1% shrinkage keeps registered geometry stable between replacement plates. It cannot substitute into food or medical roles without separate certification, and condensation grades cannot substitute here without accepting bleed, odor, and dimensional drift. Practical guidance: ① match hardness to impression pressure — too soft ghosts halftones, too hard starves solid areas; ② fix your post-mix workflow (same-direction stir, degas, then scrape/cast) since entrained air becomes print defects; ③ keep a contamination log for tooling and gloves — intermittent uncured spots on production pads almost always trace to amine/sulfur carryover. Validate with your actual ink set, wash solvents, and press speed on sample plates before qualification.

Food grade liquid silicone rubber MY LSR 3750 series for kitchenware