Glass fiber reinforced
engineering thermoplastic compounds
The question is frequently
put forward "Why
reinforced thermoplastics? What does this offer that
is an improvement over the unreinforced material or other
competitive materials?" This is a fair question
and the answer we find breaks into two main advantages.
A. Dimensional stability.
Performance / Weight Ratio benefit.
stability of thermoplastics is notoriously poor. Not
only are the materials subject to creep under sustained
load, but also to extremely high expansion and contraction
when cycled over a wide range of temperatures. Most
thermoplastics, for example, have coefficient of thermal
expansion of about ten times that of metals; therefore
it is impossible to match large thermoplastics parts
with metal parts if they are going to be subjected
to a wide range of temperature extremes because the
difference in coefficient of expansion will cause warping,
bulking and cracking. The addition of glass fiber reinforcement
provides a dramatic improvement in these two properties.
Glass reinforced thermoplastics can be designed to
withstand comparatively high loads for extended periods
of time, without significant deformation. Additionally,
the coefficient of
thermal expansion of glass fiber reinforced thermoplastics
is in the range of most diecasting metals.
Performance / Weight
ratio refers generally to a whole host of properties
aswell as cost that can be favourably achieved in glass reinforced
thermoplastics with significant improvements over competitive
materials such as metals and thermosets.
The property improvements
are directly proportional to the glass content i.e. higher
the loading better the properties. Glass fiber is likely
to remain the dominant reinforcement used in composite
materials, because it offers, for those who work with
it, a broad mixture of physical properties along with
excellent cost / performance benefits fora large
number of end use applications.
reinforced and unreinforced thermoplastics
The ease and economics
of manufacturing gears, cams, bearings, slides,
ratchets, etc., with injection moldable thermoplastic
resins has led to the widespread displacement of metals
for these applications. In addition to the inherent processing
advantages, parts made from these materials have the
ability to dampen shock and vibration, have reduced weight,
run with less power, provide corrosion protection, run
quietly and operate with low or no-maintenance.
These characteristics can be further
enhanced and the application areas expanded by the
addition of fillers, reinforcements and internal lubricants.
These additives, when extrusion compounded
with the appropriate base resin, yields an almost limitless
choice of compounds providing increased load carrying
capacity, reduced coefficient of friction, improved
wear life, higher mechanical strength, improved thermal
properties, greater fatigue endurance, creep resistance,
dimensional stability and reproducibility.
Lubricants used in these compounds are PTFE, silicone, graphite powder and MoS2.
A tailormade compound can be supplied by Sandeep to meet your requirements in lubricated compounds.