MasterSeal NP 125 (formerly Sonolastic Clear 25, now sold by Sika as Sikaflex NP 125) is a one-component, high-performance, non-priming, elastomeric thermoplastic sealant and adhesive. It requires no mixing and bonds tenaciously to common building materials including concrete and clay roof tiles, metal flashings, and masonry. Note that NP 125 is a different product from MasterSeal NP 1: it is a thermoplastic rubber built primarily for roofing work, not a polyurethane joint sealant, and it handles far less joint movement.

• Color: Clear - the clear formula blends with any substrate color
• One-component thermoplastic rubber; no mixing, non-priming
• Joint movement capability +/- 12.5% (ASTM C 719) - roughly a third of MasterSeal NP 1's +/- 35%, so it is not a substitute in moving joints
• ASTM C 920 Type S, Grade NS, Class 12.5, Use T, NT, M, A and O; Federal Specification TT-S-00230C Type II Class B
• Bonds to clay tile, concrete, masonry, aluminum, wood, vinyl, ceramic, porcelain, painted metals, composites, rubber, acrylic glass, PVDF coatings and asphalt roof shingles
• Ultimate elongation at break 560%; per the current Sikaflex NP 125 data sheet, tensile strength 422 psi at 7 days and 679 psi at 14 days, Shore A hardness 40-45, and adhesion in peel 17 pli
• Service temperature -40 to 180 deg F; no sag (ASTM C 639)
• Skins in 10-15 minutes; full cure in about 2 weeks at 75 deg F and 50% relative humidity
• Compatible with most non-rigid paints and can be painted
• Coverage: a 1/2" round bead yields about 7.7 linear feet per cartridge
• Manufacturer part: RG25CLR12
• 300 ml (10.1 fl oz) cartridge; the clear version is supplied in plastic cartridges

Applications: Residential and commercial roofing - sheet roofing, liquid applied roofs, metal roofs, shingled and tiled roofs, sealing between adjacent layers of roof tile, edge and ridge tiles, penetration seals, flashings, skylight frames, termination bars and reglets, parapet expansion joints, lap seals in metal roof assemblies, and sealing wood forms.

Tip: Keep sealant depth between 1/4" and 1/2" measured at the middle of the joint. Shelf life is 18 months for plastic cartridges and 2 years for composite cartridges.

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