Sikasil® FS-665 SL
Self-levelling fire-rated sealant
Sikasil® FS-665 SL is a fire-rated, self-levelling, low-modulus, silicone sealant with good adhesion to a wide range of porous and nonporous substrates. It is mainly used for floor joints and where fire rated sealing products are required.
- Optimised flow behaviour for filling complex facade profile geometries
- Sealant for movement joints in floors for interior applications according to EN 15651-4, PW INT 25LM, DoP 26723758, certified by Control Body 1119, and provided with the CE-mark
- Good UV and weathering resistance
- Meet fire retardant requirements of EN Meet classification of reaction to fire DIN EN 13501-1: Class B-s1, d0
Report-No. 23-001695-PR03, ift Rosenheim, Germany, September 2023
13501-1 Class E under free suspension
PRODUCT BENEFITS
- Optimised flow behaviour for filling complex facade profile geometries
- Sealant for movement joints in floors for interior applications according to EN 15651-4, PW INT 25LM, DoP 26723758, certified by Control Body 1119, and provided with the CE-mark
- Good UV and weathering resistance
- Meet fire retardant requirements of EN Meet classification of reaction to fire DIN EN 13501-1: Class B-s1, d0
Report-No. 23-001695-PR03, ift Rosenheim, Germany, September 2023
13501-1 Class E under free suspension
Usage
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 ensuring adhesion and material compatibility.Packaging
| Pail | 25 kg |
Product Details
| Chemical base | 1-component silicone | |
| Colour (CQP001-1) | Black | |
| Cure mechanism | Moisture-curing | |
| Cure type | Neutral | |
| Density (uncured) | 1.48 kg/l | |
| Non-sag properties (CQP061-4 / ISO 7390) | Self-levelling | |
| Application temperature | ambient | 5 ─ 40 °C |
| Skin time (CQP019-1) | 40 minutes A | |
| Tack free time (CQP019-3) | 240 minutes A | |
| Curing speed (CQP049-1) | (see diagram) | |
| Shore A hardness (CQP023-1 / ISO 48-4) | 15 B | |
| Tensile strength (CQP036-1 / ISO 527) | 0.6 MPa | |
| 100 % modulus (CQP036-1 / ISO 527) | 0.2 MPa | |
| Elongation at break (CQP036-1 / ISO 527) | 400 % | |
| Tear propagation resistance (CQP045-1 / ISO 34) | 3 N/mm | |
| Service temperature | -40 ─ 150 °C | |
| Shelf life | 12 months C |
| CQP = Corporate Quality Procedure | A) 23 °C / 50 % r. h. | B) 14 days curing at 23 °C / 50 % r. h. | C) storage below 25 °C |
CURE MECHANISM
Sikasil® FS-665 SL cures by reaction with atmospheric moisture. At low temperatures the water content of the air is generally lower and the curing reaction proceeds somewhat slower (see diagram 1).
The curing speed of the reaction depends mainly on the relative humidity and temperature. Material temperature above 50 °C could lead to bubble formation and has to be avoided.
Diagram 1: Curing speed Sikasil® FS-665 SL
Application
Surface Preparation
Surfaces must be clean, dry and free from grease, oil and dust. Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond.
Application
The optimum temperature for substrate and sealant is between 15 °C and 25 °C.
Sikasil® FS-665 SL is poured into suitable prepared joints.
Joints must be properly dimensioned.
For optimum performance the joint width needs to be designed according to the movement capability of the sealant based on the actual expected movement.
Joints deeper than 15 mm must be avoided.
For backfilling various materials have been evaluated including fibre boards and mineral wool.
Removal
Uncured Sikasil® FS-665 SL can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically.
Hands and exposed skin have to be washed immediately using hand wipes such as Sika® Cleaner-350H or a suitable industrial hand cleaner and water.
Do not use solvents on skin.
Application Limits
To exclude materials influencing Sikasil® FS-665 SL, all materials such as gaskets, tapes, setting blocks, sealants, etc., in direct and indirect contact have to be approved by Sika in advance.
Where two or more different reactive sealants are used, allow the first to cure completely before applying the next. Sikasil® FS-665 SL may only be used in combination with structural glazing applications after a detailed examination of the corresponding project details.
Do not use Sikasil® FS-665 SL on PMMA and PC elements as it may cause environmental stress cracking (crazing).