DOWSIL™ 813C Construction & Concrete Silicone

DOWSIL™ 813C Construction and Concrete Silicone Sealant is a one-part, neutral curing, low modulus silicone sealant particularly suitable for interior and exterior applications, such as external weather seals, expansion joints and perimetral joints in buildings and other types of construction as well as pedestrian walkways and traffic roads which do not involve immersion in fuel. DOWSIL 813C Construction and Concrete Silicone Sealant offers durable adhesion to a range of porous and non-porous surfaces including concrete, masonry, brick, PVC-U, wood and some metals used in construction without danger of corrosion from the sealant.


• Good unprimed adhesion to a variety of substrates

• Neutral cure

• Low odor

• Conforms to ISO 11600-F-25LM

• Meets the requirements of EN 15651-4 and EN 14188-2 class A

• Resistant to ozone, ultra-violet radiation and extreme temperatures

• Joint movement capability ± 50%

• Excellent weatherability –virtually unaffected by sunlight, rain, snow, ozone and extreme temperatures of -40°C to 149°C


Surface Preparation Ensure that surfaces to be sealed are clean, dry, sound and grease- free. Clean non-porous surfaced with DOWSIL™ R-40 Universal Cleaner, and dry thoroughly with a clean, lint-free cloth before application of sealant. Porous substrates such as concrete, brickwork, mortar, etc. must be mechanically cleaned of loose particles using a steel brush, sanding disc or any similar means. Note: When using any solvent, always provide adequate ventilation. Avoid heat, sparks and open flames. Use solvent resistant gloves. Observe and follow all precautions listed on solvent container label.

Masking Areas adjacent to the joints should be masked with tape to prevent contamination of the substrates and to ensure a neat sealant line. Masking tape should be removed immediately after tooling. Priming Primers are not usually required but might be needed for some specific substrates for maximum adherence. Back-Up Materials Where back-up material is required, closed cell polyethylene backer rod is recommended. Back-up materials provide back pressure and avoid three sided adhesion that limits sealant movement capability. Finishing The joint should be tooled within 5 minutes of application to ensure good contact between the sealant and the substrate. Tooling of the sealant also gives a smooth, professional finish. Clean-Up Excess sealant may be cleaned off tools and non-porous surfaces whilst in an uncured state using DOWSIL R-40 Universal Cleaner. If sealant is misapplied to porous substrates, it should be left until it is just cured and then removed by peeling, cutting or other mechanical means. Care should be taken not to damage plastic or coated surfaces

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