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Cellulose ( Regenerated Cellulose )

Material Information

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We stock and supply the following standard forms:
Fibre Film
Fibre Film

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Common Brand Names:
Cellophane, Rayophane
 
General Description:  

All forms of cellulose degrade before they melt but natural cellulose can be regenerated by the xanthate process to manufacture fibres, commonly called rayon or viscose, and film, commonly called by its earliest brand name Cellophane®. The latter films are plasticised by glycols and water to overcome their brittleness and are transparent, colourless and of moderate crystallinity. They were very widely used for packaging but have been substantially replaced by synthetic thermoplastics, especially polypropylene.

They have very high permeability to moisture and, especially when dry, very low permeabiltiy to permanent gases. Their moisture content varies greatly with their environment reaching approximately 50% at 100% relative humidity. Not surprisingly, this causes many of their properties to vary considerably - so summarised values must be treated with considerable caution.

   

Chemical Resistance

Acids - dilute Good
Alkalis Good
Greases and Oils Good

Electrical Properties

Dielectric constant @1MHz 4 (dry)
Dielectric strength ( kV mm-1 ) 30-50 @ 1mm
Dissipation factor @ 1kHz 0.06
Volume resistivity ( Ohmcm ) 101O - 1012

Mechanical Properties

Elongation at break ( % ) 18/55
Tensile modulus ( GPa ) 5/3
Tensile strength ( MPa ) 120/55

Physical Properties

Density ( g cm-3 ) 1.44
Limiting oxygen index ( % ) ~ 18
Radiation resistance Fair
Refractive index 1.47
Water absorption - equilibrium ( % ) 50

Thermal Properties

Specific heat ( J K-1 kg-1 ) ~ 1400
Thermal conductivity @10C ( W m-1 K-1 ) 0.0035

Properties for Cellulose Fibre

Property Value
Material Medium tenacity rayon
Coefficient of thermal expansion x10-6 K-1 ~80
Density g cm-3 1.5 - 1.55
Extension to break % 20 - 40
Specific Modulus cN/tex 300 - 700
Tenacity cN/Tex 13 - 23
Thermal Conductivity @23C W m-1 K-1 ~0.06

Properties for Cellulose Film

Property Value
Extension to break - Longitudinal % 18
Extension to break - Transverse % 55
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.004-0.05
Permeability to Hydrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.01-0.05
Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.02-0.06
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.004-0.04
Permeability to Water @25C x10-13 cm3. cm cm-2 s-1 Pa-1 approx 20,000
Tensile modulus - Longitudinal GPa 5
Tensile modulus - Transverse GPa 3
Tensile strength - Longitudinal MPa 120
Tensile strength - Transverse MPa 55

Buy Cellulose on-line

We stock and supply the following standard forms:
Fibre Film
Fibre Film

Choose a form to search our on-line catalogue  

Index