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Chemistry of BMC A World of Choices

Chemistry of BMC A World of Choices. What a BMC Is Thermoset Having the property of becoming permanently hard and rigid when heated or cured. Uses crosslinking as the mechanism to develop rigidity and strength. What a BMC Isn’t Thermoplastic

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Chemistry of BMC A World of Choices

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  1. Chemistry of BMC A World of Choices

  2. What a BMC Is • Thermoset • Having the property of becoming • permanently hard and rigid when • heated or cured. Uses crosslinking as • the mechanism to develop rigidity and • strength.

  3. What a BMC Isn’t • Thermoplastic • Having the property of softening or • fusing when heated and of hardening • and becoming rigid again when cooled; • thermoplastic materials can be • remelted and cooled time after time • without undergoing any appreciable • chemical change.

  4. Resin Choices • Different Acids and Alcohols • Isophthalic Acid • Maleic Acid • Fumaric Acid • Propylene Glycol • Diethylene Glycol • Neopentyl Glycol

  5. Styrene: Crosslinking Genius Dilutes the polyester resin and participates in the crosslinking of the polymers CH=CH 2 Styrene

  6. Low Profile Additives • Ranked from least effective to most effective • Polyethylene • Polystyrene • PolyMethylmethacrylate • Polyvinyl Acetate

  7. Polystyrene as a Low Profile Additive

  8. Filler (aka Ground Rock) • ATH • CAC03 • Clay • Graphite • Talc • And others.....

  9. ATH vs. CAC03 ATH CAC0 3 Which does your application require?

  10. Fiberglass • Sizing • Filament Diameter • Length • Amount

  11. In Line Fiberglass Process

  12. Additives • Initiators - temperature ranges • Pigments • Release Agents - Ca vs. Zn • Thickeners - Chemical vs. Physical • Antioxidants - Heat Stability • UV Stabilizers

  13. The Composite • Physical Form • Shrink, Density, Cure

  14. BMC Mixer

  15. BMC Property Range Glass Range, % Specific Gravity Mold Shrinkage, mil/in Flexural Strength, Kpsi Flexural Modulus, psi Tensile Strength, Kpsi Notched Izod, Fppi Water Absorption, %, 24 Hours Arc Resistance, sec Dielectric Strength, V/mil UL 94 Flame Resistance Heat Deflection @ 264 psi, Thermoconductivity, btu/hrs/ft2/0F/in Glass Transition Temperature, Tg 10-30 1.70-2.00 -1.0- +4.5 10-35 1.4-2.2 x 106 3-13 3-33 0.05-0.15 180 - 210 250 - 450 HB – V0 @ 1/32 °F 500+ 1.3-1.7 °C 145-210

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