About ISO 1567:99 and ISO 20795-1

These are similar methods to one another with respect to their overall content. These standards include requirements and methods for determining color, physical characteristics, and chemical attributes. We can help with the determination of residual methyl methacrylate (MMA) monomer, solubility, and water sorption required by these methods.

  • Approach

    Samples are dissolved in an acetone solution followed by precipitation of the polymer by addition of methanol. The resulting supernatant solution is analyzed by gas chromatography for methyl methacrylate content. 3 sample discs are tested, each in triplicate. This results in a total of 9 values for MMA content. Seven of the nine solutions must comply with the requirements below.


    Type 1: Heat-polymerizable materials

    • Class 1: Powder and liquid
    • Class 2: Plastic cake

    Type 2: Autopolymerizable materials

    • Class 1: Powder and liquid
    • Class 2: Powder and liquid for pour-type resins

    Type 3: Thermoplastic blank or powder
    Type 4: Light-activated materials
    Type 5: Microwave cured materials

  • Sample Considerations

    Please submit 3 discs with dimensions of 3 mm x 50 mm, for each material type tested

  • Experience

    We have performed this analysis in accordance with ISO 1567:99, ISO 20795-1 and Standard No. 139 for Dental Base Polymers (2012).