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GAR-DUR
Our custom
sheaves are most often machined from Gar-Dur, the densest,
toughest thermoplastic today. GAR-DUR properties that make
it ideal for sheaves are:
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Toughness
- It has the highest impact resistance of all thermoplastics.
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Abrasion
Resistance - GAR-DUR outlasts other plastics
and most metals under abrasive conditions. |
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Low
coefficient of friction - A rating of only 0.14
reduces friction, wear, vibration, downtime and maintenance. |
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Chemical
Resistance - most aggressive chemicals have virtually
no effect. |
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Moisture
Resistance - GAR-DUR does not absorb moisture.
Bacterial, fungus growth, calcium deposits will not adhere
to its surface. |
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Low
Weight - 1/7th the weight of steel, 1/3"
the weight of aluminum and lighter than most other thermoplastics. |
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Low
Cost - Low cost per pound, wide selection of
sizes to minimize waste, and ease of machining yield costs
far below steel, aluminum and even other thermoplastics.
Long term savings are even more substantial because parts
are durable and corrosion free. |
Color:
Normally yellow but also available in black for UV resistance.
Temperature range:
-460°F to 200°F
Other
UHMW
Manufacturing
methods limit GAR-DUR material to 23" OD and 2"
OAW. For sheaves beyond those dimensions we use virgin UHMW
cut from stress-relieved sheets.
Color: Off-white.
Temperature range:
-220°F to 180°F
High
Density Polyethylene (HDPE)
HDPE
has similar properties to UHMW but lower properties and
prices. Ideal for tubing, hose, synthetic rope, and similar
materials that have less demanding wear and load requirements.
Color: Off-white.
Temperature range: -180°F
to 160°F
Ceram-P(TM)
(Filled UHMW)
Ceram-P
is ceramic filled UHMW recommended for high load and severe
sliding abrasion. It is a shatter resistant alternative
to sintered ceramic but substantially heavier and more expensive
than UHMW.
Color: Lime
Green.
Temperature range:
-60°F to 220°F
Nylon
(Polyamide)
A
self lubricating, general purpose nylon that offers outstanding
wear and abrasion resistance, excellent chemical resistance
and low friction. Higher cost, lower impact resistance,
higher compressive strength than UHMW. Nylon absorbs moisture
and will change dimensions with extended immersion or exposure
to high humidity.
Cast nylon is strongly suited to two sheave applications.
The first is high volume standard products where the ability
to be cast to near net shapes in low cost molds often yields
the lowest cost final product while retaining excellent
properties.
The second, where cast nylon is the preferred material,
is in crane and hoist applications. Cast nylon hoist sheaves
offer lighter weight, 2x to 3x longer wire rope life, equal
sheave life and lower cost compared to steel sheaves.
Color: Off-white.
Temperature range:
-60°F to 190°F
MoS2 Filled Nylon
Molybdenum
disulfide is added during the polymerization of nylon to
increase the hardness and wear resistance while lowering
the coefficient of friction.
Color: Black.
Temperature range:
- 0°F to 210°F
Delrin™ (Acetal)
Acetal
is a hard but somewhat brittle material used in low impact
applications where resistance to fuels and solvents is required.
Originally selected as a sheave material years ago because
of its ability to be molded, acetal has been largely phased
out as a sheave material for processing lines and machinery.
Color: White
8 Black.
Temperature range:
-60°F to 180°F
Other materials for special sheaves include:
Teflon™
Phenolic
Aluminum
Steel
Stainless Steel
Composites
Custom Process & Mechanical Sheaves
| Guide to Material Selection
Quotation Request
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