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Butyl MS Caulk

Butyl MS Caulk

Rated 4.5/5 based on 671 customer reviews


Availability:In Stock

Butyl MS Caulk is a specifically formulated moisture cure caulk that will allow proper adhesion to the EPDM


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Product Overview

Butyl MS Caulk is a premium, innovative product that represents the next generation of sealant technology. Butyl MS Caulk does not contain any solvents or isocyanates. It exhibits excellent adhesion to many substrates, including: aluminum, brass, steel, glass, granite, marble, wood, and most plastics. Butyl MS Caulk conforms to the requirements of ASTM C920, Type S, Grade NS, Class 25, and to AAMA Specification 802.3 Type II as a Back Bedding Compound. Butyl MS Caulk through independent testing as proven itself to outperform Butyl, acrylic or Latex caulks on an application of Liquid epdm rubber.

Product Uses

Butyl MS Caulk is highly weather resistant and paintable caulk. It has also been field tested with the Liquid EPDM rubber and will not void the warranty. It is very effective in sealing around our RV's vents AC's and corners. In addition common applications include preparation for the Liquid EPDM Rubber around windows and door frames, flashing, and joint-filling.

Technical Information

Dry Time 24 Hours
Color White Low Temp. Flex., -75°F No Adverse Effect
Specific Gravity 1.3 – 1.5 Hardness (ShoreA) 45 – 50
Elongation (ASTM D412) 275% Physical State Liquid Pumpable
Tensile Strength 225 psi Corrosive Properties None
Lap Shear, 1 in./min 275 psi Shelf Life Nine Months
High Temp. Resistance Up to 400°F UV Rating, 2000 hrs No Change
Skin Time <30 mins @ 77°F Sag None

Application Information

Ensure surfaces to be sealed are clean, dry, and free of oil and moisture. Exercise care during application to prevent air or contaminant entrapment. Butyl MS Caulk is most commonly applied by pumping, either by caulking gun or power gun. It can also be applied by trowel or stiff brush. Do not handle, move, or pack for one hour until a surface film has formed. If necessary, clean tools and equipment with mineral spirits. Once cured, Butyl MS Caulk can be painted with most industrial and consumer paints, though testing is recommended.

Packaging & Handling

Do not open until ready for use in order to maximize shelf life. Store at 60°– 80°F. Read all labeling before use.

Safety Instructions

Use with adequate ventilation. Avoid contact with eyes, lips, and mouth. Avoid excessive inhalation during application. An MSDS is available upon request.


The information presented herein has been compiled from sources considered to be accurate and reliable, but is not guaranteed to be so. In practice, the differences in materials, substrates, storage conditions, actual site conditions and other factors outside of Edge Adhesives control are such that Edge Adhesives assumes no liability, nor makes any warranty, express or implied for such information, recommendations or instructions related to its products. It is the users responsibility to determine the suitability of any material for a specific purpose and to adopt such safety precautions as may be necessary.