Cellulose Acetate - CA

Introduction

Cellulose Acetate is an amorphous, colorless, transparent, glossy, and moderately hard thermoplastic with good clarity but has only moderate chemical resistance and UV stability. Owing to its high moisture absorption the usual difficulties of dimensional changes arise.

Polymer Type

Thermoplastic

Advantages

Transparent, glossy and reasonably hard for a thermoplastic.  Reasonable impact at low temperatures.

Disadvantages

Only moderate U.V. stability.  High moisture absorption and associated dimensional instability.  Flammable.  Attacked by concentrated acids and alkalies.  Swollen by chlorinated and aromatic hydrocarbons, alcohols and ketones.

Applications

Applications include cosmetic containers, tool handles, steering wheel covers, spectacle frames, pens, packaging, toys and models, brush handles, and packaging including stiff thin-walled tubes for "display packaging".

Films are extensively used for graphics purposes

Typical Properties

Property Value
Density (g/cm3) 1.28
Surface Hardness RR71
Tensile Strength (MPa) 30
Flexural Modulus (GPa) 1.7
Notched Izod (kJ/m) 0.2
Linear Expansion (/°C x 10-5) 12
Elongation at Break (%) 35
Strain at Yield (%) 3.9
Max. Operating Temp. (°C) 60
Water Absorption (%) 2.2
Oxygen Index (%) 17
Flammability UL94 HB
Volume Resistivity (log ohm.cm) 11
Dielectric Strength (MV/m) 11
Dissipation Factor 1 kHz 0.06
Dielectric Constant 1 kHz 6
HDT @ 0.45 MPa (°C) 63
HDT @ 1.80 MPa (°C) 60
Material. Drying hrs @ (°C) 2 @ 70
Melting Temp. Range (°C) 170 - 240
Mould Shrinkage (%) 0.6
Mould Temp. Range (°C) 40 - 50

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

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