EFKA 3888 Polyisocyanates modified polysiloxane Efka Additives Abrasion Resistance Antiblocking agent Flow / Levelling agent >> Silicone Slip control >> Silicone Polyurethane Coatings >> Solventborne Coatings >> Solvent-Free/ High-Solids EFKA-3888 is a polysiloxane modified polyisocyanate designed to crosslink with hydroxyl or carboxyl groups. EFKA-3888 is compatible with most polyisocyanates e.g. Desmodur® N, L, IL, HL and similar products. The addition of EFKA-3888 in polyurethane lacquers or coatings give the following advantages: improved levelling reduced tendency for orange-peel or cratering improved slip and surface smoothness, these improvements are more permanent, as the additives cross-link to form part of the final film reduced surface tension with little or no foam formation prevention of Bénard cells Application: EFKA-3888 is a cross-linking additive, designed for all polyurethane systems, both two-component and moisture-curing. It must be added to the polyisocyanate solution in two component systems. EFKA-3888, especially developed for use in metal coatings, improves levelling and surface smoothness and results in faster scratch resistance during the initial drying stage. Since EFKA-3888 actually takes part in the cross-linking action and forms an integral part of the finished polymer, the slip and scratch resistance properties are more permanent compared with normal additives. Addition: 1 - 2% calculated on the polyol component. EFKA-3888 should be added to the hardener component. The NCO-value of approx. 8% (based on solids) should be taken into account in the isocyanate calculation. Polysiloxane modified polyisocyanate designed to crosslink with hydroxyl or carboxyl groups. It is compatible with most polyisocyanates. Improves levelling, reduces tendency for orange-peel or cratering. Improves slip and surface smoothness, these improvements are more permanent, as the additives cross-link to form part of the final film. Reduces surface tension with little or no foam formation. Prevention of Bénard cells. Suitable for all polyurethane systems, both two-component and moisture curing. It must be added to the polyisocyanate solution in two component systems. Especially developed for use in metal coating finishes. When applying the polyurethane system by curtain coating on open pore wood surfaces, a defoamer should be added. Recommended usage level: 1 - 20% calculated on the polyol component. Should be added to the hardener component. The NCO-value of approx. 12% (based on solids) should be taken into account in the isocyanate calculation.