Mastix™ Butyl Tape

This versatile, trimmable, end-lap sealing tape joins metal to metal, and seals around windows, doors, roof vents, stacks, access doors and other penetration points. Non-staining and permanently flexible, Mastix stays in place with no melting or oozing, even in extreme heat.

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Unlike some tapes, Mastix combines superior performance with easy installation. It features a superior adhesive that keeps the product roll intact and prevents it from telescoping, even on hot days. Apply Mastix to a hot metal roofing panel, and it will stay put while you place the panel. You won’t experience oozing that causes panels to slide, making your installation harder.

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3/32” x 3/8” x 45’: 16 rolls/carton, 30 carton/pallet
3/32” x ½” x 45’: 16 rolls/carton, 30 carton/pallet
3/32” x ¾” x 45’: 16 rolls/carton, 30 carton/pallet
3/32” x 1” x 45’: 12 rolls/carton, 30 carton/pallet
Chemical Name: Isobutylene
Chemical Family: Butyl Mixture
Health Hazard: 0-Minimal
Flammability Hazard: 0-Minimal
Reactivity Hazard: 0-Minimal
Volatile (WL)%: 0
Solubility in Water: Insoluble
Specific Gravity (H20=1): 1.59-1.64
Evaporation Rate: Not Applicable
Appearance: Soft, pliable gum
Color: Q-126 (off-white to gray), Q126BB (black), Q-126-10 (off-white to gray)
Odor: None
Fire Hazards
Flash Point: >400°F (204°C)
Method: Pensky Marten closed cup
Extinguishing Media: Dry chemical, carbon dioxide, foam, water
Special Fire-Fighting Procedures: Large quantities of water will extinguish. Do not enter confined space without proper protective equipment.
Hazardous Combustion Products: Carbon monoxide, carbon dioxide
Hazardous Identification

Based on data available to Marco Industries, none of the components in this product are considered hazardous according to OSHA Hazard communication Standard 29CFR 1910,1200.
The composition of this mixture is proprietary information. In the event of a medical emergency, compositional information will be provided to a physician or nurse.