ISOMAT AK 20 is a high performance, flexible, polymer-modified, cement-based tile adhesive with extended open time and no vertical slip. Provides high initial and finaladhesion strength, moisture resistance and flexibility.Certified according to EN 12004 and classified as type C2 TE S1 adhesive. CE marked.Fields of applicationISOMAT AK 20 is suitable for fixing absorbent or non-absorbent tiles (e.g. “grèsporcellanato”), natural stone, decorative bricks, large-format tiles, etc. on walls or floorson various substrates, especially where high adhesion, flexibility and moisture resistanceare required (e.g. old tile layers, heated floors, gypsum boards, etc.). Suitable for indoor and outdoor use.Technical dataForm: cementitious powderColors: grey, whiteWater demand: 7.75 l/25 kg bagApplication temperature:from +5°C to +35°CApplication thickness: up to 15 mmPot life: at least 6 hOpen time: at least 30 minMinor adjustmentsopen time: at least 30 minSlip: ≤ 0.5 mmGrouting on walls: after 3-8 hGrouting on floors: after 24 hAdhesion strength after: 28 days: ≥ 1.75 N/mm2 heating at +70ºC: ≥ 1.50 N/mm2 immersion in water: ≥ 1.30 N/mm2 25 freeze-thaw cycles:≥ 1.50 N/mm2Service temperature: from -30°C to +90°CDeformability: > 2.5 mm(EN 12004-2)All measurements were conducted accordingto EN 12004-2.Directions for use1. SubstrateThe surface to be overlaid must be clean, free of dust, grease, paint, loose material, etc.Dampening of the substrate before application is recommended.2. ApplicationISOMAT AK 20 is gradually added to water under continuous stirring, until a uniform pasteis formed. A low speed mixer is recommended for mixing.The mixture should be left for about 5 minutes to settle and then slightly stirred again. Thetile adhesive should be spread (“combed”) on the substrate using a notched trowel, in orderto be uniformly applied on the whole surface. The tiles should be fixed by pressing to thedesired position. The applied mixture must be covered with tiles within 30 minutes in order to avoid “skin”formation, i.e. before the adhesive film starts setting.Consumption1.5-4.0 kg/m2, depending on the trowel notchsize and the nature of the substrate.