SCIGRIP IPS Weld-On #55 - VOC Free Polyurethane Adhesive

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Weld-On 55 is a slow curing, clear colorless, two-component, 100% reactive polyurethane adhesive that contains no volatile organic compounds (VOC). When mixed and applied, it polymerizes at room temperature to form high strength bonds within a few hours. The adhesive has excellent resistance to discoloration by UV light and has excellent lap shear and impact strength.

Substrate Recommendations

Weld-On 55 is formulated for bonding a wide variety of thermoplastics, including polycarbonate, cellulose acetate butyrate, PETG, buffed acrylic, ABS, PVC, polyurethane and foam board to themselves and one another.

Bonding Recommendations

Weld-On 55 is recommended for a variety of applications in the sign assembly industry, especially butyrate trim cap and polycarbonate in channel letter applications. It also has many uses in other plastic fabrication industries for bonding ABS to PETG.


Technical Data Sheet (TDS)

Typical Bond Strength†

Substrate Material Aged Bond Strength, lbs/in(kg/cm2)
24 Hours* 72 Hours 1 Week
ABS 2,150 (151) 2,300 (162) 2,500 (175.8)
PETG 1,600 (113) 2,350 (165) 2,400 (168.7)
Polycarbonate 1,950 (137) 2,650 (186) 2,900 (204.0)

† Substrate thickness: 0.25 inch (0.64 cm). Bond area: 1.0 in² (6.45 cm²). Ultimate Bond Strength is defined as strength achieved after 24-hour room temperature cure.

Adhesive Properties and Characteristics @ 73°F (23°C)

Color Clear
Viscosity 3000 ± 1000 cps
Reactivity Gel time = 10 Minutes, 50 Gram mass
Tack Free Time 1 hour, 0.05 inch (0.13 cm) film thickness
Working Time 5-6 Minutes
Fixture Time (Time to reach 80% of ultimate strength) 1-2 Hours
Time to reach Ultimate Bond Strength 72 Hours
Specific Gravity (g/cc) Component A: 1.068 ± 0.004
Component B: 1.112 ± 0.004


Directions for Use

Weld-On 55 is packaged in a twin-syringe cartridge that dispenses product in a 1:1 mix ratio. The cartridge must be assembled to the dispensing gun and mixing tip prior to dispensing.

  • Before inserting the cartridge in the dispensing gun, open cartridge valve and clean obstructions from cartridge nose and valve opening with a clean probe. Close valve.
  • Insert cartridge into dispensing gun. Open valve. Dispense a small amount of adhesive making sure that both components freely flow from the cartridge.
  • Attach the mixing tip to the cartridge. Press the dispensing gun to dispense and discard approximately 1 – 2 inches of the product, ensuring that the product mix properly in the mixing tip before use. If the mixing tip is left on the cartridge for a sufficient length of time without additional use, the adhesive may cure in the tip. If this happens, keep the mixing tip on the cartridge. When you are ready to dispense more adhesive, replace the mixing tip on the cartridge with a new one. Be sure to discard 1 – 2 inches of the product before use.

NOTE: The viscosity of this product will allow it to flow between the polycarbonate letter and the butyrate trim cap in most channel letter applications. The application of a reinforcing bead is recommended.

Shelf Life

One year in unopened cartridge. The date code of manufacture is stamped on the bottom of the cartridge. Shelf life is reduced at higher temperatures and enhanced at lower temperatures. To optimize shelf life, refrigerator storage is recommended and/or store in cool dark place between 50° – 80°F (10° – 27°C). Keep away from sources of heat, open flame, sparks, sunlight and moisture.


Safety Data Sheet (SDS)

Safety and Environmental Precautions

Weld-On 55 is a reactive adhesive and is classified as a hazardous material. This product does not emit VOC. In conformance with the Federal Hazardous Substrates Labeling Act, the following hazards and precautions need to be recognized and followed.


Keep out of the reach of children. Do not take internally. Keep away from heat, spark, open flame and other sources of ignition. Contact with hot surfaces may produce toxic effects. Keep container closed when not in use. Store away from direct sunlight between 50º F – 80º F (10º C– 27º C). Use only in adequate ventilation. Avoid breathing of vapors. Atmospheric levels should be maintained below established exposure limit values. See Sections II and VIII of Material Safety Data Sheet. If airborne concentrations exceed these limits, use a supplied air respirator. Do not use a chemical cartridge respirator. For emergencies and other conditions where short-term exposure may be exceeded, use an approved positive pressure self-contained breathing apparatus. In confined areas, use a positive pressure self-contained breathing apparatus (SCBA). Do not smoke, eat or drink while working with this product. Avoid contact with skin, eyes, and clothing. May cause eye injury. Protective equipment such as gloves, safety goggles, and impervious apron should be used. Carefully read Material Safety Data Sheet and follow all precautions.

First Aid

Inhalation: If overcome with vapors, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Call physician.
Eye Contact: Flush with plenty of water for 15 minutes and call a physician.
Skin Contact: Wash skin with plenty of soap and water for at least 15 minutes. If irritation develops, get medical attention.
Ingestion: If swallowed, give 1 or 2 glasses of water or milk. Do not induce vomiting. Contact physician or poison control center immediately.

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