Product Data Sheet Version 11 / 2006 Sikasil® WS-355 High performance natural stone sealant Technical Product Data Chemical base Color (CQP1 001-1) Cure mechanism Cure type Density (uncured) (CQP 006-4) Non-sag properties (CQP 061-4 / ISO 7390) Application temperature Skin time2 (CQP 019-2) Tack-free time2 (CQP 019-1) Curing speed (CQP 049-1) Shore A-hardness (CQP 023-1 / ISO 868) Tensile strength (CQP 036-1 / ISO 37) Elongation at break (CQP 036-1 / ISO 37) Tear propagation resistance (CQP 045-1 / ISO 34) 100% modulus (CQP 036-1 / ISO 37) Movement accommodation capability (ASTM C 719) Thermal resistance (CQP 513-1) Short term Service temperature Shelf life (storage below 25°C) (CQP 016-1) CQP = Corporate Quality Procedure Description ® Sikasil WS-355 is a neutral curing silicone sealant with a high movement capability and excellent adhesion to porous and non-porous substrates. ® Sikasil WS-355 is manufactured in accordance with ISO 9001 quality assurance system and the responsible care program. Product Benefits - Does not stain areas adjacent to the joint - Meets requirements of ISO 11600 25 LM F & G, ASTM C 920 (class 50), ASTM C 1248, TT-S00230C, TT-S001543A - Outstanding UV and weathering resistance. - Adheres well to natural stone, concrete, glass, metals, coated and painted metals, plastics and wood. Areas of Application Sikasil® WS-355 is a high-performance sealant particularly suitable for jointing natural stone, such as marble, granite, sandstone and quartzite. With these materials, no staining of the joint edges occurs, unlike with conventional silicone sealants. Sikasil® WS-355 is ideal for sealing facades, e.g. cladding of natural stone or other materials. This product is suitable for professional experienced users only. Tests with actual substrates and conditions have to be performed to ensure adhesion and material compatibility. 1-C silicone See product overview Moisture-curing Neutral 1.49 kg/l approx. < 2 mm approx. 5 - 40°C (41 - 104°F) 20 min approx. 120 min approx. See diagram 1 22 approx. 2 1.0 N/mm approx. 800% approx. 4 N/mm approx. 2 0.3 N/mm approx. ± 50% 180°C (356°F) approx. 200°C (392°F) approx. 220°C (428°F) approx. -40 - 150°C approx. (-40 - 302°F) 12 months

Application Limits ® All Sikasil WS, FS, SG, IG, WT and other engineering silicone sealants and adhesives are com® patible with each other. Sikasil WS and FS sealants are compatible with SikaGlaze® IG sealants. All other sealants have to be approved by Sika before using them in combination with Sikasil® WS355. Where two or more different reactive sealants are used, allow the first to cure completely before applying the next. ® Do not use Sikasil WS-355 on pre-stressed polyacrylate and polycarbonate elements as it may cause environmental stress cracking (crazing). The compatibility of gaskets,...