Products : Grout : Caulk & Sealant : Commercial 100% Silicone Sealant

Commercial 100% Silicone Sealant

Our Commercial 100% Silicone Sealant is permanently flexible and is designed for use in coves, corners, changes in plane and expansion joints  associated with exterior or interiors applications of tile and stone.  Can be used in pools and other wet applications.  Conforms to ASTM C-920, Type S, Grade NS, Class 25, Use T, NT, A, I, M and G, ASTM C1248 and ASTM C-794 properties.  Conforms to TCNA Handbook EJ 171. This product was previously named Commercial 100% Silicone Caulk.

  WHERE TO BUY Not all products are sold at all stores. Please call the distributor to ensure product availability.
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Key Features

  • Suitable for expansion joints, wet and submerged areas


  • Joints for ceramic tile and stone applications
  • Expansion joints in residential and commercial applications including those in traffic areas
  • Exterior and interior use
  • Swimming pools and other wet area applications
  • Around tubs, showers and sinks


  • For use in coves, corners, changes in plane and expansion joints
  • Exterior and interior applications of tile and stone
  • Use in pools and other wet area applications
  • Conforms to ASTM C-920, ASTM C1248 and ASTM C-794 properties


Applicable Standards

Meets the requirements of ASTM C-920, ASTM C1248 and TCNA EJ 171

Conformance to Building Codes

Installation must comply with the requirements of all applicable local, state and federal code jurisdictions.

Composition of Product

100% silicone resins and fine fillers

Environmental Consideration

Custom® Building Products is committed to environmental responsibility in both products produced and in manufacturing practices. Use of this product can contribute towards LEED® v3 certification:

  • Up to 2 points towards MR Credit 5, Regional Materials
  • Up to 1 point towards IEQ Credit 4.1, Low-Emitting Materials – Adhesives & Sealants

General Surface Prep

USE CHEMICAL-RESISTANT GLOVES, such as nitrile, when handling product.

Health Precautions

CAUTION KEEP OUT OF REACH OF CHILDREN. Provide adequate ventilation during installation. DO NOT TAKE INTERNALLY. AVOID EYE CONTACT. WARNING: This product contains one or more chemicals known to the State of California to cause cancer.

Limitations to the Product

  • Joint depth should not exceed 1/2" (13 mm)
  • Joint width should not exceed 1" (2.5 cm)
  • Material will stain some stones. Test small area before installation

Application of Product

Sealant should be installed after grout has cured. Joints and surfaces should be clean, dry and free of all contamination including old caulk or other sealants. Backup strips shall be flexible and compressible type of closed-cell foam polyethylene, butyl rubber, or urethane. Backup strip should fit tightly in the joint and to a depth that allows the caulk depth to be 1/2 the thickness of the tile. Cut tip off nozzle on a slant to desired opening size. Completely fill joints with caulk. Smooth or clean off excess caulk with mineral spirits or paint thinner before caulk cures. After cure, remove excess with a razor blade. Do not apply when temperatures fall below 40°F (4°C). IMPORTANT: Commercial 100% Silicone Caulk is not a paintable surface. Painting should be done prior to installation.

Drying Time

Protect finished work from traffic and exposure to water until fully cured, generally 24 hours at 70° F (21° C). Caulk should cure a full 7 days before being exposed to continuous submersion in water.

Cleaning of equipment

Clean all tools with paint thinner or mineral spirits before material dries.


Store away from extended or extreme heat and cold. Keep from freezing. Replace cap after each use.

Product Maintenance

Clean with a neutral cleaner such as Aquamix AquaKleen or Tilelab Grout & Tile Cleaner

Ordering Information


10.1 oz (300 ml) cartridge

Warranty Information

Product Warranty

Custom® Building Products warrants to the original consumer purchaser that its product shall be free from defects in material and workmanship under normal and proper usage for a period of one year following the date of original purchase. Custom's® sole liability under this warranty shall be limited to the replacement of the product. Some states, countries or territories do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty will not extend to any product which has been modified in any way or which has not been used in accordance with Custom's® printed instructions. Custom® makes no other warranties either expressed or implied. This warranty gives you specific legal rights, and you may have other rights that vary from state to state or from one country/territory to another.  This warranty is not transferrable.

Coverage Chart

Size Coverage
10.1 oz. (300 mL) 24 lineal feet (7.3 M) of 1/4" x 1/4" (6 x 6 mm) joint

Chart for estimating purposes. Coverage may vary based on installation practices and jobsite conditions. For more tile and joint sizes, use the material calculator at or contact CUSTOM Technical Services at 800-282-8786

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