SIKASIL® -670 FIRE | JOINT SEALANT
Fire-rated joint sealant
Up to 4 hours fire resistance according to EN 1366-4
Very good resistance to weathering
Easy to smooth and very good workability

DESCRIPTION
Sikasil®-670 Fire is a fire-rated, 1-component, moisture-curing, low-modulus elastic joint sealant.

USES
Sikasil®-670 Fire is designed for fire rated movement
and connection joints on porous and non-porous substrates.

CHARACTERISTICS / ADVANTAGES
▪ Up to 4 hours fire resistance according to EN 1366-4
▪ Very good resistance to weathering
▪ Movement capability of ± 35% (ASTM C 719)
▪ Easy to smooth and very good workability
▪ Good adhesion to many different substrates
▪ Neutral curing

ENVIRONMENTAL INFORMATION
▪ LEED® EQc 4.1
▪ SCAQMD, Rule 1168
▪ BAAQMD, Reg. 8, Rule 51

APPROVALS / STANDARDS
▪ EN 15651-1 F EXT-INT CC 25 LM
▪ EN 15651-4 PW INT
▪ ISO 11600 F 25 LM & G 25 LM
▪ ASTM C 920, class 35
▪ EN 1366-4 assessment report
▪ ETAG 026 assessment report
▪ EN 13501-2 classification report
▪ EN 140-3
▪ EN 13501-1 class B-s2-d0

PRODUCT INFORMATION
Chemical Base Neutral cure silicone
Colour: Grey
Storage Conditions Sikasil®-670 Fire shall be stored in dry conditions, where it is protected from direct sunlight and at temperatures between +5 °C and +25 °C.
Density 1.35 kg/l approx. (ISO 1183-1)

TECHNICAL INFORMATION
Shore A Hardness 16 approx. (after 28 days) (ISO 868)
Secant Tensile Modulus 0.30 N/mm2 approx. at 100% elongation (23 °C) (ISO 8339)
0.50 N/mm2 approx. at 100% elongation (−20 °C)

Elongation at Break 650% approx. (ISO 37)
Elastic Recovery 70% approx. (ISO 7389)
Tear Propagation Resistance 4.0 N/mm approx. (ISO 34)
Movement Capability ±25% (ISO 9047) ±35% (ASTM C 719)
Service Temperature −40 °C to +150 °C
Joint Design The joint width must be designed to suit the joint movement required and the movement capability of the sealant. The joint width shall be ≥ 10 mm and ≤ 40 mm. The joint depth shall be ≤ 20 mm. A width to depth ratio of 2:1 must be maintained (for exceptions, see table below).

Backing Material Use polyethylene foam backing rods.
Sag Flow 2 mm approx. (20 mm profile, 50 °C) (ISO 7390)
Ambient Air Temperature +5 °C to +40 °C, min. 3 °C above dew point temperature
Substrate Temperature +5 °C to +40 °C
Curing Rate 2 mm/24 hours approx. (23 °C / 50% r.h.) (CQP 049-2)
Skin Time 25 minutes approx. (23 °C / 50% r.h.) (CQP 019-1)
Tooling Time 20 minutes approx. (23 °C / 50% r.h.) (CQP 019-2)

APPLICATION INSTRUCTIONS
SUBSTRATE PREPARATION
The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Sikasil®-670 Fire adheres without
primers and/or activators

APPLICATION METHOD / TOOLS
Sikasil®-670 Fire is supplied ready to use.
After the necessary substrate preparation, insert a suitable backing rod to the required depth and apply any primer if necessary. Insert a foil pack or cartridge into the sealant gun and extrude Sikasil®-670 Fire into the joint making sure that it comes into full contact with the sides of the joint and avoids any air entrapment. Sikasil®-670 Fire sealant must be firmly tooled against the joint sides to ensure adequate adhesion. It is recommended to use masking tape where exact joint lines or neat lines are required. Remove the tape within the skin time. Do not use tooling products containing solvents.

CLEANING OF TOOLS
Clean all tools and application equipment immediately after use with Sika® Remover-208 and/or Sika® TopClean T. Once cured, residual material can only be removed mechanically.

FURTHER DOCUMENTS
▪ Safety Data Sheet (SDS)
▪ EN 13501-2 classification report
▪ ETAG 026 assessment report
▪ Brochure Sika Fire Protection Solutions

LIMITATIONS
▪ Sikasil®-670 Fire cannot be overpainted.
Colour variations may occur due to exposure to chemicals, high temperatures and/or UV-radiation (especially with the colour shade white). However, a change in colour is purely of aesthetic nature and does not adversely influence the technical performance or durability of the product.
▪ Do not use Sikasil®-670 Fire on natural stone.
Do not use Sikasil®-670 Fire on bituminous substrates, natural rubber, EPDM rubber or on any building materials which might bleed oils, plasticizers or solvents that could attack the sealant.
▪ Do not use Sikasil®-670 Fire to seal joints in and around swimming pools.
▪ Do not use Sikasil®-670 Fire for joints under water pressure or for permanent water immersion.
▪ Do not expose uncured Sikasil®-670 Fire to alcohol-containing products as this may interfere with the curing reaction.