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Formula: CA
Form: Disk
Material: Cellulose acetate (CA)
CAS Number: 9004-35-7
Commodity: Polymers

Cellulose Acetate Disk

Cellulose Acetate disks are a versatile product available in 119 variations that cover a wide range of diameters, thicknesses and tolerances. It is made from cellulose acetate which is a thermoplastic polymer derived from cellulose that exhibits high strength, toughness and optical clarity. Its durability, low cost and ease of fabrication make it ideal for applications ranging from scientific equipment to consumer goods. These disks can be machined, bonded or thermoformed for use as washers, spacers, lenses, windows, and other precision components across industrial, optical, and medical settings. With such a large range of options, Goodfellow's Cellulose Acetate disks enable you to select the optimal configuration for your specific application.
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Tolerances

Disk
Thickness ±20%

Material Properties for Polymers

Chemical Resistance
Electrical Properties
Physical Properties
Mechanical Properties
Thermal Properties
Chemical Resistance
Element Value
Acids - concentrated Poor
Acids - dilute Good-Poor
Alcohols Fair-Poor
Alkalis Poor
Aromatic hydrocarbons Good-Poor
Greases and Oils Good
Halogenated Hydrocarbons Good-Poor
Halogens Poor
Ketones Poor
Electrical Properties
Element Value
Dielectric constant @1MHz ~5
Dissipation factor @ 1kHz 0.06
Dielectric strength( kV mm⁻¹ ) 11
Volume resistivity( Ohmcm ) 5 x 10¹²
Physical Properties
Element Value
Flammability HB
Radiation resistance Fair
Refractive index 1.49
Resistance to Ultra-violet Fair
Limiting oxygen index( % ) 19
Water absorption - over 24 hours( % ) 1.9-7
Density( gcm⁻³ ) 1.3
Mechanical Properties
Element Value
Hardness - Rockwell 34-125
Tensile modulus( GPa ) 01-Apr
Izod impact strength( J m⁻¹ ) 100-450
Abrasive resistance - ASTM D1044( mg/1000 cycles ) 65
Tensile strength( MPa ) 12-110
Thermal Properties
Element Value
Heat-deflection temperature - 0.45MPa( C ) 52-105
Heat-deflection temperature - 1.8MPa( C ) 48-86
Lower working temperature( C ) -20
Upper working temperature( C ) 55-95
Specific heat( J K⁻¹ kg⁻¹ ) 1200-1900
Thermal conductivity( W m⁻¹ K⁻¹ ) 0.16-0.36@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 80-180

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