SOF-SEAL (Canada)

Product Data, W. R. MEADOWS

32 13 73.16 DATA SHEET 7900-112 Related Content:
Safety Data Sheet:
Comp. A | Comp. B

Cold-Applied, Low-Modulus Horizontal Joint Sealant

SOF-SEAL is a premium-grade, pourable, two-component horizontal sealant composed of a special combination of polymeric compounds that provides outstanding performance in both Portland cement and asphaltic concrete. Once properly mixed, and applied, it cures to a soft, highly flexible, rubber-like material that is capable of maintaining a sealed joint or crack over a wide temperature range. SOF-SEAL does not track in the summer and will not become brittle at temperatures as low as -29° C.  The product remains soft, flexible, and pliable in the joint even after repeated freeze/thaw cycles.

SOF-SEAL offers excellent elongation, high resiliency, tenacious bonding power, and excellent longevity. This self-leveling sealant requires no special application equipment and can easily be poured into cracks and joints.

SOF-SEAL is a versatile pavement sealant suitable for both large- and small-scale sealing.  It is excellent for crack repair and preventive maintenance sealing projects.  It is ideal for use when a maintenance group doesn’t have a melter or where it is not practical to fire-up and repeatedly move melter-applicator units (small-scale sealing projects).  Typical applications include the sealing of expansion and contraction joints, longitudinal joints and random cracks in concrete pavements, reflective and random cracks in asphaltic paving, and asphaltic-to-concrete shoulder joints. It’s ideal for high-sheer bridge joint applications. In addition, SOF-SEAL can be used as a pitch pan sealant.

Two-component, cold-applied SOF-SEAL is packaged in convenient 11.36 litre (3 U.S. gallon) units. The base material is furnished in an oversized container suitable for mixing and pouring. The activator is furnished in a bottle inserted in a plastic bag which hangs inside the container. Both components are premeasured to exact quantities. Mix all materials in container; do not mix partial units.


  • Provides a cost-effective alternative to hot-applied sealants.
  • Delivers reliable, consistent performance even during cold weather or after repeated freeze-thaw cycles.
  • Remains pliable in the joint for years … a superb preventive maintenance factor.
  • Accommodates joint movement effectively over a wide range of temperatures.
  • Offers exceptional elongation, longevity, high resiliency, and tenacious bonding power.
  • Rejects ingress of incompressibles.
  • Does not become brittle or crack out in winter … will not flow in warm weather.
  • Maintains low stress development because of its low modulus properties.
  • A proven alternative to silicone-base sealants.
  • Can be used as a pitch pan sealant.


Application Life @ 21° C 45 Minutes
Penetration mm/10  
@ 25° C 140
@ -18° C 35
Flow, cm None
Resilience, % 90%
Bond Test, 3 cycles  
200% extension @ -29° C Pass 3 cycles
Elongation, 300% @ -29° C Pass 1 cycle

1000 litres/m³ (7.47 gals./ft.³). A joint 12.7 mm x 12.7 mm (1/2″ x 1/2″) will require 16 litres/100 m (1.3 gal./100 lineal feet).

When stored indoors in original, unopened containers at temperatures between 4° – 32° C, optimum performance and best use is obtained within two years of date of manufacture.

Joint Sizes … Proper joint design practices and application techniques must be followed for successful performance.  SOF-SEAL should be used in joints not less than 6.35 mm (1/4″) wide.   A 2:1 width-to-depth ratio should be maintained. However, in no case should joint sealant depth be less than 6.4 mm (1/4″) or exceed 12.7 mm (1/2″).

Joint Preparation … Remove foreign substances, incompressibles, and free water from joint opening. For proper adhesion, joints must be clean and dry. Dust, dirt, and laitance should be removed prior to application. SOF-SEAL adheres well to unprimed concrete; however, the use of P/G PRIMER from W. R. MEADOWS is recommended for optimum adhesion. To control sealant depth, insert CERA-ROD backer rod or DECK-O-FOAM® from W. R. MEADOWS in the joint before sealing. For larger joints, where additional support is required, use a non-asphaltic joint filler such as CERAMAR® flexible foam expansion joint filler from W. R. MEADOWS.  For straight joint edges, mask off top surfaces with masking tape.

Mixing … The two components of SOF-SEAL are premeasured and must be mixed together at one time. Add Part A, the activator, to Part B, and mix to blend thoroughly. Mixing can be accomplished with a variable speed drill operated at slow speeds (see A) or by hand (see B). In either case, the mixing should be interrupted occasionally and the mixing paddle used to wipe material from the sides and bottom of the container for thorough blending.

Preferred Method: Mixing with a variable speed drill fitted with a slotted, flat-headed paddle is best accomplished when the drill is operated at slow speeds, not to exceed 400 rpm.  MIXING TIME IS FIVE MINUTES MINIMUM.

Mixing by hand can be accomplished with a flat, wooden mixing paddle.  MIXING TIME BY HAND IS EIGHT MINUTES MINIMUM.

Pouring … SOF-SEAL may be poured from its original container or any clean container suitable for pouring. A commercial sealing pot equipped with a narrow pouring spout and shutoff valve is ideal. To facilitate prompt opening to vehicular traffic, about one hour after applying sealer, dust with limestone dust or talc, as an example, to minimize tracking. Clean up before material has cured with an aromatic solvent such as toluene. After material has cured, it will be necessary to cut or abrade the material from equipment.

SOF-SEAL components are premeasured to exact quantities. Mix all materials in container; do not mix partial units or dilute. SOF-SEAL is specifically formulated to remain soft and pliable in pavement joints and cracks and is not suggested for application in plaza decks, shopping malls, and other areas subjected to mass pedestrian traffic, high heels, etc. Prior to mixing, SOF-SEAL should be stored at temperatures of 13° C or higher. Apply only when the temperatures of the air and joint interfaces are 4° C or higher. Do not use on wet joints.

Avoid contact with skin or prolonged breathing of vapours. Refer to Safety Data Sheet for complete health and safety information.

32 13 73.16 – Field-Molded Concrete Paving Joint Sealants

May help contribute to LEED credits:

  • IEQ Credit 4.1: Low Emitting Materials: Adhesives and Sealants
  • MR Credit 2: Construction Waste Management
  • MR Credit 5.1: Regional Materials




W. R. MEADOWS, INC. designs, manufactures, and markets high-quality building materials for today's construction professionals. Products are sold through an authorized distribution network. The family-owned and operated company focuses on product quality, exceptional service, and trusted integrity since its founding in 1926.
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