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Structural BMI Resin SB332

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SB332 is a one part low viscosity bismaleimide infusion resin developed for high temperature composite parts with service temperature up to 200°C. The resin is characterized by low viscosity at impregnation and molding temperatures (100 cP at 120°C), which makes it possible to obtain CFRP with low porosity. Pre-curing at 190 °C allows to remove composite tool from plastic model. Post-curing at 230°С provides service temperature composite part up to 200°. It shows the following features and properties:

  • Wide processing window > 2 hours at 120°C
  • Pre-curing at 190°С
  • Post-curing at 230°C
  • Glass transition temperature 270°C
  • High mechanical performance
  • Properties


    Water absorption


    4.6 % at 20 °C

    for 54h to boiling water


    Elastic modulus


    4.4 GPa at 20 °C

    Show Bismaleimide (BMI) materials with Elastic modulus of 4.4 GPa at 20 °C

    ASTM D638

    Flexural strength


    165 MPa at 20 °C

    Show Bismaleimide (BMI) materials with Flexural strength of 165 MPa at 20 °C

    ASTM D790

    Plane-Strain Fracture Toughnes


    0.84 MPa·√m at 20 °C

    Show Bismaleimide (BMI) materials with Plane-Strain Fracture Toughnes of 0.84 MPa·√m at 20 °C

    ASTM D5045

    Strain energy release GIC

    ASTM D5045

    Tensile strength


    85 MPa at 20 °C

    Show Bismaleimide (BMI) materials with Tensile strength of 85 MPa at 20 °C

    ASTM D638


    Coefficient of thermal expansion


    5.1E-5 1/K at 20 °C

    ASTM E831

    Glass transition temperature


    280 °C

    ASTM E2092

    Technological properties

    Application areas

    Resins for Composite Materials

    Processing methods

    Assemble the vacuum bag. Perform a leak test, the rate of the vacuum drop should not be more than 1 mbar per minute. The residual pressure in the bag must not be more than 10 mbar. Assemble the second vacuum bag, put airweave material between the layers of the vacuum film. Perform a leak test for the second vacuum bag. The residual pressure in the bag must not be more than 10 mbar. Degas for 20-30 minutes, at 100-120°C, at a pressure of no more than 10 mbar. During the degassing, the resin should be stirred intensively. Heat the tool up to 120-130°C. Maintaining the temperature of resin dispenser at 120°C, start the infusion process. After complete impregnation of the bag, close the resin inputs, but continue evacuation from the inner bag for at least 30 minutes. Then close the outputs from the inner bag. Maintain the outer vacuum bag until the end of curing process. Increase the temperature at a rate of 2°C/min to 160°C. Dwell at 160°C for 3 hours, heat to 190°C at a rate of 2°C/min, dwell at 190°C for 3 hours. It is possible to heat up to 190°C without exposure at 160°C, in the case that the auxiliary materials and mold materials withstand such conditions. Before removing the part, cool the mold to at least 90°C at a speed of no more than 5°C/min. Post-cure can be performed without tooling. Heat to 180°C at a rate of 2°C/min, from 180°C to 230°C, heat to 190°C at a rate of 0.5°C/min dwell 5 hours at 230°C. Do not cool faster than 5°C/min. For the measurement of vacuum, the use of absolute pressure sensors is recommended.

    This material data has been provided by Matmatch.

    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.