Product Data Sheet Version 3 (07 / 2014) Self-levelling fire-rated sealant Technical Product Data 1) CQP = Corporate Quality Procedure Description Sikasil® FS-665 SL is a fire-rated, self-levelling, low-modulus, silicone sealant with excellent adhesion to a wide range of porous and non-porous substrates. Sikasil® FS-665 SL is manufactured in accordance with ISO 9001 quality assurance system and the responsible care program. 2) 23 °C / 50 % r.h. Product Benefits - Fire rated: EN 11925-2 / DIN 4102-B1; up to 4 hours insulation and integrity (BS 476, part 20) - Meets requirements of ISO 11600 25 LM F & G, ASTM C 920 - Outstanding UV and weathering resistance - Provided with CE-mark according to EN 15651-4:2012, PW INT 25LM, certified by Control Body 1119. Areas of Application Sikasil® FS-665 SL can be used in horizontal joints between curtain wall facades and floor slabs to prevent spreading of fire and smoke. It is also suitable in other industrial applications where good UV, thermal and fire resistance are required. 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.

Cure Mechanism Sikasil® FS-665 SL cures by reaction with atmospheric moisture. The reaction thus starts at the surface and proceeds to the core of the joint. The curing speed depends on the relative humidity and the temperature (see diagram 1 below). Heating above 50 °C to speed-up the vulcanization is not advisable as it may lead to bubble formation. At low temperatures the water content of the air is lower and the curing reaction proceeds more slowly. Diagram 1: Curing speed IC-Sikasil® Application Limits Most Sikasil® WS, FS, SG, IG, WT, AS and other engineering silicone sealants manufactured...