SIKAFLEX® 591 – WHITE

Description

Product benefits:
– IMO approved
– Exceeds EH&S standards
– Free of isocyanate, solvents, PVC, phthalates and tin catalysts
– Highly elastic
– Excellent weathering stability
– Very good processing and tooling characteristics
– Bonds well to a wide variety of marine substrates

Areas of Application:
Sikaflex® 591 is a multipurpose sealant designed for marine applications. It is suitable for elastic, vibration-resistant joint seals and for a wide variety of interior and exterior sealing applications. Sikaflex® 591 bonds well to substrates commonly used in the marine industry. Sikaflex® 591 is not suitable for applications with teak wood and plastics that are prone to stress cracking (e.g. PMMA, PC, etc.). This product is suitable for experienced professional users only. Test with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.

Chemical Base: Silane Terminated Polymer
Color (CQP001-1): Grey
Cure Mechanism: Moisture-curing
Density (Uncured): 1.5 kg/l
Non-Sag Properties: Very good
Application Temperature: 5 ─ 40 °C
Skin Time (CQP019-1): 35 minutes A
Open Time (CQP526-1): 20 minutes A
Curing Speed (CQP049-1): (see diagram on Technical info tab)
Shrinkage (CQP014-1): 1%
Shore A Hardness (CQP023-1 / ISO 7619-1): 45
Tensile Strength (CQP036-1 / ISO 527): 2.2 MPa
Elongation at Break (CQP036-1 / ISO 527): 500%
Tear Propagation Resistance (CQP045-1 / ISO 34): 15 N/mm
Service Temperature (CQP513-1): -50 ─ 80 °C
Shelf Life (CQP016-1): 12 months B
CQP = Corporate Quality Procedure: A) 23 °C / 50 % r. h. | B) storage below 25 °C

Cure Mechanism

Sikaflex® 591 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 below diagram).

Chemical Resistance

Sikaflex® 591 is generally resistant to fresh water, seawater, diluted acids and diluted caustic solutions; temporarily resistant to fuels, mineral oils, vegetable and animal fats and oils; not resistant to organic acids, glycolic alcohol, concentrated mineral acids and caustic solutions or solvents.

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. Suggestions for surface preparation may be found on the current edition of the appropriate Sika^® Pre-treatment Chart. Consider that these suggestions are based on experience and have in any case to be verified by tests on original substrates.

Application
Sikaflex® 591 can be processed between 5 °C and 40 °C but changes in reactivity and application properties have to be considered. The optimum temperature for substrate and sealant is between 15 °C and 25 °C. Sikaflex® 591 can be processed with hand, pneumatic or electric driven piston guns.
In case Sikaflex® 591 could get in contact with polyurethane ensure that those products are cured or wait at least 24 hours prior to seal.

Tooling and finishing
Tooling and finishing must be carried out within the skin time of the product. It is recommended using Sika® Tooling Agent N. Other finishing agents must be tested for suitability and compatibility prior the use.

Removal

Uncured Sikaflex® 591 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!

Sikaflex 591 x 1

Additional information