Editorial Feature

Cellulose Propionate (CP)

Cellulose proprionate (CP) is a derivative of cellulose when reacted with propanoic acid (the reagent). CP is an organic ester with the following R group: H or -(C=O)CH2CH3.

Polymer Type

Thermoplastic

Advantages

  • Relatively lower plasticiser migration than cellulose acetate or cellulose acetate butyrate

  • Stiffer than cellulose acetate or cellulose acetate butyrate.

  • Transparent and glossy with better low temperature impact properties cellulose acetate or cellulose acetate butyrate.

Disadvantages

  • Lower weathering resistance than Cellulose Acetateor Cellulose Acetate Butyrate

  • More expensive than Cellulose Acetate or Cellulose Acetate Butyrate

  • Attacked by acids & alkalis and swollen by chlorinated and aromatic hydrocarbons, alcohols and ketones

Typical Properties

Property Value
Density 1.22
Surface Hardness RR94
Tensile Strength (MPa) 35
Flexural Modulus (GPa) 1.76
Notched Izod (kJ/M) 0.13
Linear Expansion (/°C x 10-5) 12
Elongation at Break (%) 60
Strain at Yield (%) 4
Maximum Operating Temperature (°C) 60
Water Absorption (%) 1.8
Oxygen Index (%) 17
Flammability UL94 HB
Volume Resistivity (log ohm.cm) 12
Dielectric Strength (MV/m) 11
Dissipation Factor 1kHz 0.03
Dielectric Constant 1kHz 4
HDT @ 0.45 MPa (°C) 96
HDT @ 1.80 MPa (°C) 82
Material Drying hrs @ (°C) 2 @ 70
Melting Temperature Range (°C) 180 - 250
Mould Shrinkage 0.5
Mould Temperature Range (°C) 40 - 50

Applications

  • Spectacle frames - injected around the hinges of the frame. Used for its low weight and superior optical properties to other commonly used polymers.

  • Goggles - dual-layers in visers with other polymers. Used due to its excellent optical properties.

  • Tool handles - as it is lightweight it can help to reduce the weight of the tool.

  • Covers for television screens - gives the screen suitable protection from impact.

  • Cutlery handles - high chemical resistance if contacted by acidic food products.

Source : Abstracted from Plascams.

For more information on Plascams please visit RAPRA Technology Ltd.

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