Chemistry of BMCA World of Choices

Chemistry of BMCA World of Choices

What a BMC IsThermoset

• 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 IsThermoset

• 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’tThermoplastic

• 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.

What a BMC Isn’tThermoplastic

• 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.

Resin Choices

Different Acids and Alcohols

• Isophthalic Acid

• Maleic Acid

• Fumaric Acid

• Propylene Glycol

• Diethylene Glycol

• Neopentyl Glycol

Resin Choices

Different Acids and Alcohols

• Isophthalic Acid

• Maleic Acid

• Fumaric Acid

• Propylene Glycol

• Diethylene Glycol

• Neopentyl Glycol

Styrene: Crosslinking Genius

Dilutes the polyester resin and participates in

the crosslinking of the polymers

Styrene: Crosslinking Genius

Dilutes the polyester resin and participates in

the crosslinking of the polymers

CH=CHCH=CH22

StyreneStyrene

Low Profile Additives

Ranked from least effective to most effective

• Polyethylene

• Polystyrene

• PolyMethylmethacrylate

• Polyvinyl Acetate

Low Profile Additives

Ranked from least effective to most effective

• Polyethylene

• Polystyrene

• PolyMethylmethacrylate

• Polyvinyl Acetate

Polystyrene as a Low Profile AdditivePolystyrene as a Low Profile Additive

Filler (aka Ground Rock) ATH

CAC03

Clay

Graphite

Talc

And others.....

Filler (aka Ground Rock) ATH

CAC03

Clay

Graphite

Talc

And others.....

ATH vs. CAC03ATH vs. CAC03

Which does your application require?

Which does your application require?

ATHATH CAC0CAC033

Fiberglass

Sizing

Filament Diameter

Length

Amount

Fiberglass

Sizing

Filament Diameter

Length

Amount

In Line Fiberglass ProcessIn Line Fiberglass Process

Additives

Initiators - temperature ranges

Pigments

Release Agents - Ca vs. Zn

Thickeners - Chemical vs. Physical

Antioxidants - Heat Stability

UV Stabilizers

Additives

Initiators - temperature ranges

Pigments

Release Agents - Ca vs. Zn

Thickeners - Chemical vs. Physical

Antioxidants - Heat Stability

UV Stabilizers

• Physical Form

• Shrink, Density, Cure

• Physical Form

• Shrink, Density, Cure

The CompositeThe Composite

BMC MixerBMC Mixer

BMC Property RangeBMC Property Range

Glass Range, % Specific Gravity Mold Shrinkage, mil/in Flexural Strength, KpsiFlexural Modulus, psiTensile Strength, KpsiNotched Izod, FppiWater Absorption, %, 24 HoursArc Resistance, secDielectric Strength, V/mil UL 94 Flame ResistanceHeat Deflection @ 264 psi,Thermoconductivity, btu/hrs/ft2/0F/inGlass Transition Temperature, Tg

Glass Range, % Specific Gravity Mold Shrinkage, mil/in Flexural Strength, KpsiFlexural Modulus, psiTensile Strength, KpsiNotched Izod, FppiWater Absorption, %, 24 HoursArc Resistance, secDielectric Strength, V/mil UL 94 Flame ResistanceHeat Deflection @ 264 psi,Thermoconductivity, btu/hrs/ft2/0F/inGlass Transition Temperature, Tg

10-301.70-2.00-1.0- +4.510-351.4-2.2 x 1063-133-330.05-0.15180 - 210250 - 450HB – V0 @ 1/32°F 500+1.3-1.7°C 145-210

10-301.70-2.00-1.0- +4.510-351.4-2.2 x 1063-133-330.05-0.15180 - 210250 - 450HB – V0 @ 1/32°F 500+1.3-1.7°C 145-210