Product Data Sheet Show all documents
SikaBond®-948

SikaBond®-948

(former MWeld 948)

HIGH-STRENGTH, HIGH-SOLIDS POLYURETHANE ADHESIVE

SikaBond®-948 is a high-strength, high-solids, low-VOC polyurethane adhesive that is stronger than conventional adhesives. It produces a permanent overnight bond to almost any substrate. It can be used in a wide range of climates and conditions.

  • Low odor and low VOC formulation is safe to use in occupied indoor spaces
  • Strong and versatile adhesion that permanently bonds together nearly any material
  • High solids, nonshrinking formulation provides desired coverage without cracking or losing bond over time
  • Provides a tenacious bond that is stronger than many substrates it joins together, up to 3 times the strength of conventional adhesives
  • Provides permanent overnight bond for faster project completion
  • Long open time offers flexibility in repositioning, user friendly
  • Can be applied to frozen, frost-free lumber for on-site versatility
  • Broad service temperature range is suitable for use in hot and cold environments
Product Data Sheet Show all documents

Usage

  • Interior and exterior
  • Above grade
Substrate
  • Most rigid building materials
  • Treated and untreated lumber
  • Brick
  • Metal
  • Concrete
  • Masonry
  • Plywood / OSB
  • Fiberboard
  • Cement board
  • Rigid insulation
 

Advantages

  • Low odor and low VOC formulation is safe to use in occupied indoor spaces
  • Strong and versatile adhesion that permanently bonds together nearly any material
  • High solids, nonshrinking formulation provides desired coverage without cracking or losing bond over time
  • Provides a tenacious bond that is stronger than many substrates it joins together, up to 3 times the strength of conventional adhesives
  • Provides permanent overnight bond for faster project completion
  • Long open time offers flexibility in repositioning, user friendly
  • Can be applied to frozen, frost-free lumber for on-site versatility
  • Broad service temperature range is suitable for use in hot and cold environments

Packaging

  • 313 ml cartridges
  • 828 ml cartridges

Colour

Light brown

Product Details

Sustainability / Certifications / Approvals

APPROVALS / CERTIFICATES

  • Adhesive meets or exceeds all requirements of the American Plywood Association Specification AFG-01, Adhesive for Gluing Plywood to Wood Framing.
  • FHA Bulletin UM-60
  • ASTM D 3498
Product Information

Composition / Manufacturing

SikaBond®-948 is a high-solids polyurethane elastomer that cures by reaction with atmospheric moisture.

Weight:
1.30 kg/L (10.8 lbs/gal)

Shelf Life

1 year when properly stored

Storage Conditions

Store in unopened containers in a cool, dry area away from direct sunlight. Storing at elevated temperatures will reduce shelf life. SikaBond®-948 remains flexible even when stored at freezing temperatures, but should be stored at room temperature for at least 24 hours before using.

Freezing Point

Does not freeze

Flash Point

121°C (250°F)

Solid content by volume

90%

Viscosity

Up to 1,000,000 cps
Technical Information

Pull-Off Strength

Adhesive Strength Chart

Substrate

24 hrs

7 days

Plywood to Douglas fir

3.73 MPa (541 psi)

5.91 MPa (858 psi)

Plywood to treated lumber

5.93 MPa (861 psi)

6.89 MPa (1,000 psi)

Metal to Douglas fir

2.16 MPa (313 psi)

2.16 MPa (313 psi)

Foam to foam*0.25 MPa (37 psi)0.25 MPa (37 psi)
Oriented strandboard to Oriented strandboard (wet)2.44 MPa (354 psi)3.75 MPa (544 psi)
Wet Douglas fir to metal1.50 MPa (217 psi)2.16 MPa (313 psi)
Frozen Douglas fir to frozen Douglas fir2.48 MPa (360 psi)5.70 MPa (828 psi)
Plywood to F.R.P.0.69 MPa (100 psi)1.53 MPa (222 psi)

Note: Average data is from 10 specimens.  Wet lumber is from overnight soak.
*Foam tears apart at (0.25 MPa) 37 psi .
Test results are typical values obtained under laboratory conditions. Reasonable variations can be expected.

Lap Shear Strength

Property

Results MPA (PSI)

Comments

Chemlite to plywood

2.35 (341)

Plywood failure

Kynar to plywood

2.34 (340)

Sika Primer 173 on Kynar

Textruded polyurethane to plywood1.65 (240)32 minutes tack time

Shrinkage

None

Application

Application Information

Product Temperature

Service Temperature:
Up to 121°C (250°F)

Open Time

Up to 1 hour

Curing Rate

SikaBond®-948 forms a firm set in 1–2 hours and a tenacious bond overnight. Cure time varies with temperature, humidity, and the porosity of the materials joined.
Consumption

Yield

Bead Size

Lineal

3 mm (1/8 inch)

126.2 m/l (1,569 ft/gal)

5 mm (3/16 inch)

56 m/l (697 ft/gal)

6 mm (1/4 inch)31.5 m/l (392 ft/gal)
8 mm (5/16 inch)20.2 m/l (251 ft/gal)
10 mm (3/8 inch)14 m/l (174 ft/gal)
Application steps

SUBSTRATE PREPARATION

  1. Surfaces must be structurally sound, dry, clean, and free of dirt, moisture, loose particles, oil, grease, asphalt, tar, paint, wax, rust, waterproofing or curing and parting compounds, and membrane materials.

On Metal Surfaces
Remove scale, rust, or other coatings to expose a bright white surface.

On Concrete, Stone, or Other Masonry Surfaces:
Clean by grinding, sandblasting, or wirebrushing to expose a sound surface free of contamination and laitance.

On Wood Surfaces:
The surface must be clean and sound. Scrape away paint to bare wood.

Priming

SikaBond®-948 bonds well to most substrates; however, it is the user’s responsibility to check the adhesion of the cured adhesive on specific substrates. For further information, contact Sika Technical Services.

APPLICATION

  1. Apply by caulking gun or trowel.
  2. Wearing gloves during application is highly recommended. Once material has cured it cannot be removed.
  3. Because of the high strength provided by SikaBond®-948 adhesive, do not apply it as heavily as you would a conventional adhesive. Cut the smallest possible opening in the spout to render the appropriate-sized bead. Be certain to fill all gaps between materials.
  4. Materials may be repositioned without loss of adhesive strength up to one hour after application.
  5. When necessary, use mechanical fasteners to hold materials in place until the adhesive has fully cured.

CLEAN UP

Clean all tools and equipment immediately after use with a dry cloth; Xylene, mineral spirits, or acetone may also be used. Cured material must be mechanically removed.

 

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