Mold release agents and release-liner coatings

• Specify the molded polymer or the liner substrate; identify the exact adhesive when evaluating a release liner.
• Match the supplied form to spray, wipe or coating equipment, and confirm any dilution or ready-to-use status for the exact grade.
• Measure release after repeated cycles or aging, while keeping temperature, coating amount and separation method documented.
• Check material transfer onto the part or adhesive and test the planned painting, printing or bonding operation.
• For curing coatings, qualify the complete polymer, crosslinker and catalyst combination; do not exchange components by name alone.

VN-SI-1169 and VN-SI-1177 list 100% active content with 25°C viscosities of 500 cSt and 280 cSt respectively. VN-SI-1170 and VN-SI-1171 are milky liquids with listed active contents of 35% and 60%. These distinctions inform handling and trial design; they do not define equal working dilutions or a universal ranking of release efficiency.

Include more than the first successful demolding cycle. Observe buildup, surface gloss and defects on the part, cleaning frequency and release after the tool reaches its normal operating condition. If a part releases cleanly but fails to bond, examine transferred residue and the cleaning sequence before approving the formulation. Ready-to-use wording on selected grades should be confirmed against the current supplied product.

VN-SI-1293 is positioned for paper, with a glassine reference of 12 seconds at 120°C. VN-SI-1294 targets PET film and lists 15 seconds at 120°C on PET, alongside the glassine reference. These laboratory points are not guaranteed oven residence times: actual substrate temperature, coating weight and oven efficiency must be verified.

Use the matched crosslinker and catalyst specified for the polymer. Fully disperse crosslinker in the main polymer before adding catalyst under mixing; never premix concentrated crosslinker directly with catalyst. Check smear, rub-off and migration after cure. Compare release force with the intended adhesive at controlled peel speed and aging, then examine residual adhesion instead of approving a liner on easy peel alone.