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Polymethylmethacrylate ( PMMA, Acrylic )

Material Information

Buy Polymethylmethacrylate on-line

We stock and supply the following standard forms:
Film Monofilament Powder Rod Sheet Sphere Tube
Film Monofilament Powder Rod Sheet Sphere Tube

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Common Brand Names:
Diakon, Lucite, Oroglas, Perspex, Plexiglas
 
General Description:  

General Description : Often just called "acrylic" - though this really describes a large family of chemically related polymers - PMMA is an amorphous, transparent and colourless thermoplastic that is hard and stiff but brittle and notch-sensitive. It has good abrasion and UV resistance and excellent optical clarity but poor low temperature, fatigue and solvent resistances. Though flammable, it has low smoke emission.

General purpose grades can be extruded and injection moulded. Monomer casting (for a description, see Nylon 6) is also used to achieve much higher molecular weights - which are not melt processable because of their extremely high melt viscosity - with somewhat improved properties. The monomer cast items most commonly encountered are sheets and novelty displays in which e.g. insects or watch parts are embedded.

Thin films are normally made from impact modified grades, which incorporate a small proportion of elastomer(s), in order to improve their flexibility.

Applications include sinks, baths, displays, signs, glazing (especially aircraft), lenses and light covers. Cast sheet is also used for guards and the like.

   

Chemical Resistance

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

Dielectric constant @1MHz 2.6
Dielectric strength ( kV mm-1 ) 15
Dissipation factor @ 1MHz 0.014
Surface resistivity ( Ohm/sq ) 1014
Volume resistivity ( Ohmcm ) 2-14 x 1015

Mechanical Properties

Elongation at break ( % ) 2.5-4
Hardness - Rockwell M92-100
Izod impact strength ( J m-1 ) 16-32
Poisson's ratio 0.35 - 0.4
Tensile modulus ( GPa ) 2.4-3.3
Tensile strength ( MPa ) 80

Physical Properties

Abbe number 57.2
Density ( g cm-3 ) 1.19
Flammability HB
Limiting oxygen index ( % ) 17-20
Radiation resistance Fair
Refractive index 1.49
Resistance to Ultra-violet Good
Water absorption - over 24 hours ( % ) 0.2

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 70-77
Heat-deflection temperature - 0.45MPa ( C ) 105
Heat-deflection temperature - 1.8MPa ( C ) 95
Lower working temperature ( C ) -40
Specific heat ( J K-1 kg-1 ) 1400 - 1500
Thermal conductivity @23C ( W m-1 K-1 ) 0.17-0.19
Upper working temperature ( C ) 50 to 90

Properties for Polymethylmethacrylate Film

Property Value
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.1
Permeability to Water @25C x10-13 cm3. cm cm-2 s-1 Pa-1 500

Properties for Polymethylmethacrylate Monofilament

Property Value
Material 1.0/2.2
Extension to break % <8
Maximum Use temperature C 85
Minimum bending radius mm 90 - >25
Minimum Use temperature C -55
Tensile force N >90
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Polymethylmethacrylate on-line

We stock and supply the following standard forms:
Film Monofilament Powder Rod Sheet Sphere Tube
Film Monofilament Powder Rod Sheet Sphere Tube

Choose a form to search our on-line catalog  

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