Elastomeric Coatings

Polymer DispersionsElastomeric Coatingswww.clariant.inClariant Chemicals (India) Ltd.P.O. Sandoz Baug, Kolshet RoadThane 400 607Phone: 91 22 2531 5118Fax: 91 22 2531 5131Email: asis.patnaik@clariant.comMany of their dyestuffs, pigments, and chemicals are patented by Clariant in numerousindustrial countries.® Trademark of Clariant registered in numerous countries.® * Trademark registered in numerous countries and licensed to Clariant.® + Other Manufacturer's registered trademarkThe signs ® , ® * and ® + appear only at the first mention of the productThe information and recommendations presented here were compiled with the utmostcare, but cannot be extended to cover every possible case. They are intended to serve asnon-binding guidelines and must be adapted to the prevailing conditions.

Elastomeric CoatingsElastomeric Coatings can be categorized as “exterior“ coatings withspecial character / propertiesI. EWC (= Elastomeric Wall Coatings)II. ERC (= Elastomeric Roof Coatings) or flexible roof coatingsIntroductionExterior wall paints do not only have a decorative function but alsoprovide protection against environmental conditions which can beaggressive and therefore cause aesthetical and technical damages overa certain time span (e.g ”crack” formation)Characteristic of CracksDefinition of different crack types:Chalking Crazing Microcrack Crack Crevicesurfacedefectwidth 2mmmay extend throughthe entire material( use of spactlingcompound)Determination of Elongation At Breakpunch out of theroof coating filmfor testingroof coating filmElongation at Break At Different Temproof coating 60% binderDM 765 LDM 7900 LDM 7945Important properties/requirementslgood outdoor durability (low tack; low dirt pick-up;yellowing resistance)lrain proof and hue resistancelwater vapour diffusion capacity/permeability (adequate PVC)lresistance against algae and fungilresistance to blistering and crackinglhigh elasticity (low Tg)Flexible Roof CoatingDetermination of Surface TackDetermination of Crack BridgingFirstly evaluate the substrate condition (“new” or already aged), theorientation of facades, the presence of cracks etc,amongst the exterior wall paints, we can distinguish betweentraditional facade paints and the Elastomeric Wall Coatings (EWC)old roof surfaceEWCroof surface after applicationof flexible roof coatingroof coating60% binderoutcoming stamp forpunctual loadComparison of Mowilith LDM7945Elongation vs PVCFlexible Roof Coatings - ApplicationsDM 765 LDM 7900 LDM 7945elongation at break (%)EWC has the technical function to accommodatemovements in the substrate, bridge already existingcracks and those cracks which can appear during theageing process of a buildingThe flexible character of these coatings has to bemaintained over a broad temperature range and for along lasting time, act as a barrier to liquid water andcarbon dioxide gas on one hand and be permeable forwater vapour on the other hand (ie. the system mustbe able to “breath”)EWC has to meet decorative aspects eg. resist dirtpick-uplllapplication by a rollervarious colours are possibleDetermination of The Residual Elongation8 h stretching by 100%_16 h relaxation time_determination of theresidual elongation_