Pecora Synthacalk GC2+ provides a durable, elastomeric, weathertight seal for caulking joints in commercial and industrial projects. Synthacalk GC2+ is particularly effective where exposure to solvents or chemicals is anticipated and for continuous immersion in liquids. Synthacalk GC2+ is a two part, polysulfide, non-sag sealant that maintains an effective bond between materials of similar or dissimilar porosities, surface texture, or expansion coefficients. Synthacalk P53VOC primer must be applied to joint surfaces. Sealant must be applied after primer has dried, but within 8 hours after application.
fuel and chemical storage tanks
wastewater treatment, potable water, and petrochemical plants.
Synthacalk GC2+ is not recommended for:
structural or butt glazing
joints less than 1/4” (6 mm) in width or depth
certain architectural paints and finishes without prior testing
One year in original, unopened containers stored at temperatures lower than 80°F
Pecora Synthacalk GC2+ meets or exceeds Federal Specification TT-S-00227E, Type II, Class A and ASTM C920, Type M, Grade NS, Class 25, Use, NT, T, M, G, A.
Synthacalk GC2+ exceeds the test requirements of ASTM C1247 for sealants exposed to continuous immersion in liquids and NSF Standards 61, Section 6 for Joining and Sealing Materials.
Synthacalk GC2+ two component joint sealant is resistant to the effects of sunlight, rain, snow, ozone, aging, shrinkage, and the daily and seasonal cyclic changes in temperature, even after years of exposure.