H.B. Fuller 1956

H.B. Fuller 1956 is a high-quality, multi-purpose, sag-resistant, one-component polyurethane sealant. This material is condensation-cure material. It has high strength and vibration-damping properties. It is used for automobile manufacturing, the shipping industry, container manufacture, heating and ventilation systems, and a variety of maintenance and repair applications.

Product Type: 1K (1 component) Sealant, Radiation Curable Adhesive

Application Area: Electric Vehicle (EV), HVAC Applications, Windows

Compatible Substrates & Surfaces: Aluminum

Chemical Family: Polyurethanes (PU)

Features: Good Adhesion, Good Green Strength, Good Sagging Resistance, Good Strength, Good Weather Fastness, High Viscosity, Improved Ageing Resistance, Low Odor, Thixotropic, UV Resistant, Vibration Damping

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Labeling Claims

Applications & Uses

Compatible Substrates & Surfaces
Cure Temperature and Time

3mm thickness in 24 hr; Full-cure is 7 Days at 25°C at 50% R.H. or 5 hours at 70°C.

General Instructions
  • If storing below 25°C, bring material to room temperature 24 hours before using
  • Prior to bonding, surfaces must be clean and free of any dust, oils, or other contaminants
  • Using preheated substrates can reduce the time prior to handling
  • Apply adhesive to one or both of the surfaces to be bonded. The surfaces can then be assembled and heat cured immediately.It is not recommended to use 1925 at temperatures below 5°C or higher than 35°C.
  • 1925 is typically dispensed through a nozzle that has an opening with the desired dimensional extrusion size. This is done by cutting the opening on a cartridge of sausage pack tip or with custom metal designed nozzles for bulk dispensing. Once the packages are opened, it is recommended to use the shortest possible time to apply the materials.
  • It is not recommended to reseal and use the material at a later date. After material is applied it can be smoothed with a spatula and soapy water. 1925 material surface can be painted after it is fully cured. It is highly recommended that a pre-test be done on a small sample area to confirm paint compatibility and adhesion.


Physical Form
Black thixotropic paste
Cured Properties
ValueUnitsTest Method / Conditions
Operating Temperature- 40 - 90°C
Elongation at Break (at 50% RH)min. 450%ASTM D638
Tear Strength20.0NN/mm²
Hardness55.0Shore A
Tensile Strength (at 50% RH)6.0MPaASTM D638
Uncured Properties
ValueUnitsTest Method / Conditions
Specific Gravity1.2
Handling Time (50% RH)5 - 6h
Skin Formation Time50 - 60min

Packaging & Availability

Regional Availability
  • Africa
  • Asia Pacific (Excluding Russia)
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America

Storage & Handling

Shelf Life
9 Months
Storage Condition

For optimum shelf life, store below 5°C. Partially used containers should always be nitrogen purged to prevent moisture contamination, which could result in pressurized containers. Moisture contaminated material cannot be recovered.