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LPR
Rings
are manufactured from a particular raw material whose
composition, hardness  and
micro-structure are thoroughly tested to ensure the highest
standards of quality. The inherent properties of the Material
being used ensure a perfect balance of strength, wear resistance and durability.
GREY
CAST IRON
- A
Pearlitic medium Phosphorous Grey Iron, because of its
inherent wear resistance, good machinability and relatively
low cost is the most common basic material being used
for regular application, intermediate and oil control
rings.
For
top rings, ALLOYED
CAST IRON
duly heat treated with better physical properties, proper
& uniform hardness and microstructure is also being used.
It posses high bending strength & is recommended for
heavy duty engines.
For high RPM engines and automotive applications rings
are also being made from NODULAR
IRON (S.G./DUCTILE IRON)
being one of the highest tensile strength material. High
strength ductile material is best suited for rings which
are subjected to heavy thermal loads & high dynamic
stresses. These rings have high resistance against bending
, wear & breakage.
Wear resistance coatings
as CHROME PLATING &
MOLYBDENUM SPRAY are being
used for enhancing the life and working conditions of
Piston Rings. For some specific applications COPPER COATING
on the periphery by spray is also applied.
MANGANESE
PHOSPHATE, a chemical etching of the surface and TIN PLATING
are two types of surface treatments to assist the initial
run-in of the ring and to protect it from rusting.
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