Plastic Material for CNC Machining
In the CNC prototype industry, the CNC plastic prototypes are made by plastic materials
including ABS, PC, PMMA and some not commonly used PA. POM. The characteristic of
CNC plastic materials are introduced as the following.
ABS: ABS is a kind of new material in CNC prototype industry.
Its full name is acrylonitrile butadiene styrenics copolymers,
which is the maximum production and the most common used polymer.
It unify the properties of PS,SAN,BS, which is of the good mechanical property of
toughness, hardness and firmness. Its main characteristic includes excellent
impact strength, good stability of size, dyeability, good molding processing
and machining, good mechanical strength, high-stiffness, low moisture uptake,
good corrosion resistance, simple connection, avirulent insipidity, excellent
chemical properties and electrical insulation performance. In the high temperature,
ABS endure and isn’t out of shape, in the low temperature, it is of high impact toughness.
It is also a tough , not easy to be scratched material.
Manufacturing temperature : from-50 degree centigrade to + 70 degree centigrade.
PC: The major components of PC is polycarbonate, which is a high quality material made
by CO-EXTRUSION. Its surface covers absorbent of high concentrations of ultraviolet
with long resistance and fast colour.
(1) Transparency: The transmittance of PC reach 89%, which can be compared with glass.
The UV layer prototype wouldn’t produce yellowing , atomization, poor transmittance
under sun. Ten years later, transparency only runs off 6%, the PVC runs off 15%--20%,
fiberglass runs off 12%-20%.
(2) Resistance: The impact strength is 250-300 times of common glass, 2-20 times
of tempered glass.
(3)Ultraviolet-proof : One side of PC prototype plate with UV proof and another
is of condensation- resistance.
(4) Light weight: its weight is only the half weight of glass. It reduce the cost
of transportation, unloading, installation and braced frame.
(5) Flame retardant : National standard GB50222—95 have confirmed that PC is first
fire-retardant, that is B1 level.
PMMA: Its English name is acrylic, whose chemical name is polymethylmethacrylate.
It is an important thermoplastic plastic, which is of good transparency, chemical stability
and weather resistance. It is also easy to paint, to process.
Its major characteristics as following:
(1) Its transparency likes crystal and light transmittance higher than 92%.
(2) PMMA is of excellent weather resistance, higher surface hardness and lustrous surface,
and good high temperature performance.
(3) PMMA have good machinability. It can not only adopt thermal forming, but also machining.
(4) The abrasive resistance of PMMA is closed to aluminium material.
(5) PMMA have good printability and sprayability, which can adopt suitable printing and painting.
(6) Flame resistance: It belong to inflammable material but non hypergol.
