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PMMA Balls

PMMA Balls from Goodfellow come in 6 sizes ranging from 1 to 30 mm diameter. Made from polymethylmethacrylate (PMMA), these balls exhibit excellent optical clarity, high stiffness, and good dimensional stability. Polymethylmethacrylate balls find use in a variety of scientific applications including flow visualization experiments and particle image velocimetry. They are also commonly used as spacers and low friction bearings in industrial equipment.
Diameter: 3.18mm
Sphericity: 25µm
Quantity: 100 piece
Technical Name: Polymethylmethacrylate
Formula: PMMA, Acrylic
Density: 1.185g/cm³
CAS Number: 9011-14-7
Type: Precision Sphere
UOM Code: 191-685-66
SKU: 1000075298
Product Code: ME30-SP-000120

Tolerances

Balls
Diameter Standard ±5%
Diameter Precision See Item
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€140.04
each
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Tolerances

Balls
Diameter Standard ±5%
Diameter Precision See Item
Technical Data Sheet
Safety Data Sheet

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Material Properties for Polymers

Physical Properties
Element Value
Abbe number 57.2
Flammability HB
Radiation resistance Fair
Refractive index 1.49
Resistance to Ultra-violet Good
Limiting oxygen index( % ) 17-20
Water absorption - over 24 hours( % ) 0.2
Density( gcm⁻³ ) 1.19
Chemical Resistance
Element Value
Acids - concentrated Good-Poor
Acids - dilute Good-Poor
Alcohols Good-Poor
Alkalis Good
Aromatic hydrocarbons Poor
Greases and Oils Good
Halogenated Hydrocarbons Poor
Halogens Poor
Ketones Poor
Electrical Properties
Element Value
Dielectric constant @1MHz 2.6
Dissipation factor @ 1MHz 0.014
Dielectric strength( kV mm⁻¹ ) 15
Surface resistivity( Ohm/sq ) 10¹⁴
Volume resistivity( Ohmcm ) 2-14 x 10¹⁵
Mechanical Properties
Element Value
Hardness - Rockwell M92-100
Poisson's ratio 0.35-0.4
Elongation at break( % ) 2.5-4
Tensile modulus( GPa ) 2.4-3.3
Izod impact strength( J m⁻¹ ) 16-32
Tensile strength( MPa ) 80
Thermal Properties
Element Value
Heat-deflection temperature - 0.45MPa( C ) 105
Heat-deflection temperature - 1.8MPa( C ) 95
Lower working temperature( C ) -40
Upper working temperature( C ) 50-90
Specific heat( J K⁻¹ kg⁻¹ ) 1400-1500
Thermal conductivity( W m⁻¹ K⁻¹ ) 0.17-0.19@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 70-77
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