Flexiprene® PSI-952
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Flexiprene PSI-952 One-part Self-leveling Urethane Sealant Product description Flexiprene PSI-952 is a one-part, self-leveling, moisture-curing, polyurethane joint sealant formulated to form a permanent watertight seal in both interior and exterior joints in horizontal surfaces. It contains no solvents. Flexiprene PSI-952 cures to a flexible rubber with extraordinary adhesion and cohesion, capable of compensating for joint movement of ±25% of the original joint width. It is capable of supporting foot traffic as well as light, vehicular traffic. Basic uses Flexiprene PSI-952 was specifically developed for sealing horizontal joints of dissimilar porosities, coefficients of expansion and surface textures including joints in plazas, malls, parking decks, pavements, driveways, factory and institutional joints. It has proven successful as a traffic loop sealant. Benefits • Fast curing. • Good for slopes up to 3%. • Excellent resistance to weathering. • High abrasion resistance and tear strength. • Good adhesion to macadam. • Paintable when cured. Application limitations • Sealant may form air bubbles or blisters when applied to porous surfaces, damp substrates or in very humid environments. Bubble formation may be minimized by priming substrate prior to sealant application. • Not for use in joints where the movement will exceed ±25% of the original width. • Should not be used for structural or butt glazing, nor in expansion joints less than 1/4" (6 mm) in width or depth. • Not for use in direct contact with liquid asphalt. • Product is not solvent- or fuel-resistant. Colors Gray. Custom colors available; minimum order may apply. Packaging Packaged in 30 fl. oz. (900 ml) cartridges, 10 per carton. Pail and drum packaging available. Applicable standards Flexiprene PSI-952 meets or exceeds the requirements of Federal Specification TT-S-00230C, Type I, Class A; ASTM C920-95, Type S, Grade P, Class 25, use T, G, M, A, and O; and Canadian Specification CAN/CGSB 19.13-M87. Flexiprene PSI-952 complies with Southern Coast Air Quality Management District SCAQMD) Rule 1168 for adhesives and sealants. Installation Joint design: The width of the joint should be a minimum of 4 times the calculated joint movement. The width or depth of the joint should not be less than 1/4" (6 mm). In joints up to 1/2" (12 mm) wide, the depth of the sealant should be equal to the width. In joints wider than 1/2" (12 mm), the depth should be maintained at 1/2" (12 mm). Joint width should not exceed 1" (25 mm). Surface preparation: Joints to receive sealant must be sound, smooth, uniform in dimensions and free from defects and foreign materials. They must also be clean, dry, and free of frost and all contaminants, such as coatings, sealers (waterproofing), curing compounds, etc. To test adhesion, apply a sealant bead and allow to cure thoroughly. Then pull one end of the bead to test adhesive strength. Protecting the top edges of the joints with masking tape will help make a nicer looking job. Priming: Flexiprene PSI-952 has excellent adhesion to most common, firm, uncontaminated materials. Primer use is recommended in exterior applications for greater long-term adhesion. Priming is highly recommended for below-grade installations and for applications that are frequently wet, friable, or sandy.

For porous surfaces, PSI-591 Primer is recommended. Allow primer to dry for about 2 hours before applying sealant. For non-porous surfaces, PSI-590 Primer is recommended. Sealant can be applied after a 15-minute drying time. Primer should be applied only to clean, dry surfaces prior to installation of backer rod or bond breaker tape, and sealant should be kept within the confines of the joint to avoid staining adjacent surfaces. See data sheets and SDS for PSI-590 and PSI-591 Primers for more detailed information and safety precautions. Backup material: The purpose of backup material is to...

Adhesion testing by PSI: This program is intended to eliminate potential field application problems by pre-testing the adhesion of PSI's construction sealants on samples of building materials submitted by the customer. The tests will aid in determining the proper surface preparation method, effective solvents for cleaning, and whether priming is necessary to achieve optimum adhesion. Following this procedure will remove many of the variables that affect field success. Test samples should be identified as to manufacturer, origin, designed use, building project, person and firm originating...