BUTYL FLASHING GRADE 321 is a single component vapor barrier elastomer seam sealer specially formulated to provide a waterproof, weather resistant membrane with excellent permeability and ultra-violet protection. BUTYL 321 offers good elongation and tensile strength to resist lateral movement and allow for expansion and contraction of the substrate.
RECOMMENDED USES
BUTYL FLASHING GRADE 321 is recommended as a protective vapor barrier seam sealer for a variety of situations, including all types of seams, fasteners, gaps between metal panels, gutters, vent pipe flashings, air conditioning units and expansion joints. Ideal for metal roof applications with visible rust.
APPLICATION INSTRUCTIONS:
BUTYL FLASHING GRADE 321 may be applied by brushing or troweling. Apply BUTYL 321 only to clean, dry, sound surfaces free of loose particles or other foreign matter. BUTYL 321 can be used with any size fabric to help seal large cracks. Any of WeatherStar’s roof coatings may be applied within 12-24 hour of the application of BUTYL 321.
LIMITATIONS AND PRECAUTIONS:
WARNING: This product contains VM & P Naphtha and Xylene. KEEP AWAY FROM HEAT, OPEN FLAME OR SPARKS. USE ONLY IN WELL VENTILATED AREAS WITH PROPER PROTECTIVE EQUIPMENT. Avoid breathing vapor or mist. Approved (MESA/NIOSH) chemical respirator and protective clothing must be worn by applicator and personnel in vicinity of the application.
TECHNICAL DATA
| Color: | White |
| Viscosity: | 70,000 cps |
| Tensile Strength: | 500 ± 50 psi |
| Elongation: | 500% ± 50% |
| Total Solids: | 50% ± 2% |
| Flash Point: | 68° F |
| Hardness: | 55 Shore A |
| Permeability: | .005 perm inch |
| Shelf Life: | 12 months @ 40° - 90° |
| Weight per Gallon: | 8.2 ± .2 lbs. per gal. |
| Impact Resistance: | Exceeds 160 in/lb. |
| Clean Up: | Xylene |
| Service Temperature: | -50° to 200° F |
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