POURTHANE SL – Self-Leveling Joint Sealant


Product Data, W. R. MEADOWS

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pourthane-sl-self-leveling-joint-sealantSelf-Leveling Joint Sealant

POURTHANE SL is an elastic, one-component, self-leveling, premium-grade polyurethane sealant specifically developed to be used as a multi-purpose horizontal joint sealant in applications where a high chemical resistance to fuels, oils, and hydrocarbons is required. The product is a moisture cure sealant with excellent adhesive properties and resistance to aging and weathering.

POURTHANE SL is used to seal horizontal expansion joints in concrete and cementitious slabs, such as sidewalks, balconies, pavement, terraces, warehouses, factories, civil structures, plazas, runways, and pitch pans.


  • One-component, no mixing.
  • Self-leveling.
  • Movement capacity of +/-25%.
  • Accelerated curing.
  • Jet fuel resistant.
  • Permanently elastic.
  • High durability.
  • Resists aging and weathering.
  • Excellent adhesion.
  • Convenient, easy-to-use packaging.
  • Low VOC content.

20 Oz. (592 mL) Sausages
29 Oz. (825 mL) Cartridges
5 Gal. (18.93 L) Pails
55 Gal. (208.20 L) Drums

Limestone, Stone Gray, Tan

This chart shows the approximate number of lineal feet that can be sealed per gallon. One gallon is approximately four cartridges.

Joint Width
Joint Depth 1/4″ (6.4 mm) 3/8″ (9.5 mm) 1/2″ (12.7 mm) 5/8″ (15.9 mm) 3/4″ (19.1 mm) 7/8″ (22.2 mm) 1″ (25.4 mm)
1/4″(6.4 mm) 308 205 154 122
3/8″(9.5 mm) 82 68 58 51
1/2″(12.7 mm) 51 44 38

When estimating, figure 5 cartridges/gal. (2 cartridges/1.5 L).
Cubic inches/gal. – 231 (1000 cm3)
Cubic inches/cartridge – 21 (344.13 cm3)

For triangular cross-section joints:
1/4″ (6.35 mm) each side – 616 linear ft./gal. (49.6 m/L)
1/2″ (12.7 mm) each side – 154 linear ft./gal. (12.4 m/L)
3/4″ (19.1 mm) each side – 68 linear ft./gal. (5.5 m/L)

When stored indoors and in original, unopened containers at temperatures between 41 – 77° F (5 – 25° C), shelf life is a minimum of one year from date of manufacture, except for pails and drums, which have a shelf life of six months.


  • ASTM C 920-11, Type S, Grade P, Class 25, Use T1, T2, NT, M, O, G.
  • Conforms to BS 5212 for determination of resistance to heat, aging, and fuel immersion.
  • Can/CGSB 19.13-M87, Classification C-1-40-B-N and C-1-25-B-N, No. 81028
  • Canadian approval for use in areas that handle food
  • Federal Specification TTS-00230C, Type 1, Class A
  • Approval/Standards Conform to 1S0 11600 F 25 HM
  • USDA compliant for use in areas that handle meat and poultry

TECHNICAL DATA (Typical Results)

Appearance Pasty
Specific Gravity 1.509
Viscosity @ 74° F (23° C) Brookfield RVT / spindle 6 / 5 rpm : ca. 15,000 mPa.s
Density @ 68° F (20° C) 1.52 ± 0.05
Application Temperature 40 – 100° F (4.4 – 37.8° C)
Skin Formation Time @ 74° F (23° C) and 50% RH 60/120 Min.
Shore A Hardness (ASTM D 2240) 21 Day 35 +/- 5
Temperature Resistance -40 – 176° F (-40 – 80° C)
Resistance to Dilute Acids and Bases Average
UV Resistance Good
Water and Salt Spray Résistance Excellent
Compatibility w/ Paints Water-Based: Yes
Solvent-Based: Test beforehand
Modulus @ Break ASTM D412 >0.6 MPA
Elongation @ Break ASTM D412 >800%
VOC Content 24 g/L

Surface Preparation … Clean all surfaces. Joint walls must be sound, clean, dry, frost-free, and free of all oil and grease. Curing compound residues and any other foreign matter must be thoroughly removed. Install bond breaker tape or KOOL-ROD from W. R. MEADOWS to prevent bond at base of joint.

Priming … Priming is not usually necessary. Substrates only require priming if testing indicates a need or where sealant will be subjected to water immersion after cure. If priming is required, use P/G PRIMER from W. R. MEADOWS.

Application Method … Condition material to 65˚ – 75˚ F (18.3˚ – 23.9˚ C) before using. Sealant should be installed when joint is at mid-range of anticipated movement. Gun sealant into joint opening in one direction and allow sealant to flow and level out as necessary. Tool as required; minimum tooling is necessary. Joint dimensions should allow for ¼” (6.35 mm) minimum and ½” (12.7 mm) maximum thickness for sealant. Proper design is 2:1 width-to-depth ratio. Always use bond breaker tape or KOOL-ROD from W. R. MEADOWS for support on horizontal joints.

Cleanup … Application tools can be cleaned with toluene or xylene before curing. Afterwards, mechanical cleaning will be required.

Allow one-week cure at standard conditions when used in total water immersion applications. Maximum exposure level of chlorine is 5 ppm. Do not cure in presence of curing silicone sealants. Avoid contact with alcohol and other solvent cleaners during cure. Do not apply when moisture vapor transmission condition exists from the substrate. High temperatures or humidity may cause uncured material to bubble. Product may bubble if substrates are not absolutely dry or if material is applied too deep. Maximum depth of POURTHANE SL should be 3/8″ (10 mm). Do not use caulks, sand, or incompressibles as a bottom in a joint. Do not install when rain is expected before the product develops a substantial skin. Storing at elevated temperatures will reduce shelf life.

May help contribute to LEED credits:

  • IEQ Credit 4.1: Low Emitting Materials: Adhesives & Sealants
  • MR Credit 2: Construction Waste Management
  • MR Credit 5: Regional Materials

This material last updated November 2013.

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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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