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Thermoplastic Valves Product Guide & Engineering Specifications

Materials

Made in the U.S.A. Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Page 716

Due to Material Cost Variations, Prices Sub

ect to Chan

e. Check On-line Catalo

www.spearsmf

.com

FKM — Fluoroelastomer

Fluoroelastomers are a special purpose fluorocarbon-based

synthetic rubber categorized under the ASTM designation

of “FKM”. The FKM O-ring is commonly referred to as a

“Viton

O-ring”. However, “Viton

” is only one of many

FKM brand names and is a registered trademark of DuPont.

Performance Elastomers L.L.C. Spears

uses general purpose

Type 1 FKM O-rings with a minimum of 66% fluorine con-

tent for the best balance of overall properties. FKM exhibits a

very broad range of chemical resistance, including petroleum

oils, di-ester based lubricants, silicate fluids and greases,

halogenated hydrocarbons, and mineral acids. FKM is not

recommended for ketones, amines, anhydrous ammonia, hot

hydrofluoric or chlorosulfonic acids, or automotive brake

fluids. The maximum recommended service temperature of

FKM is 400°F (204°C).

Nitrile (Buna-N) — Nitrile elastomer

Used in O-ring seals, nitrile elastomers are recommended

for petroleum oils and fluids, silicone oils and greases,

di-ester based lubricants, ethylene glycol based fluids,

and cold water. Nitrile is not recommended for phosphate

ester hydraulic fluids, halogenated hydrocarbons, strong

acids, ketones, ozone or automotive brake fluids. The

maximum recommended service temperature of nitrile is

275°F (135°C).

FFKM (Aegis™, Kalrez

) — Perfluoroelastomer

Aegis™ is a trademark of ISC Freudenberg-NOK, Kalrez

is a registered trademark of DuPont-Dow Elastomers.

These specialty materials are virtually inert and provide the

greatest range of chemical resistance found in an elastomer.

However, be aware that perfluoroelastomers are substan-

tially more expensive than other elastomer compounds.

Perfluoroelastomers are serviceable to 600°F (360°C) and

performance is limited at very low temperatures.

CSM (Hypalon

) — Chlorosulfonated Polyethylene

Hypalon

is a registered trademark of DuPont-Dow

Elastomers. CSM is a close match to neoprene, but it has

improved chemical resistance. This specialty compound

offers good abrasion resistance with superior resistance to

weather, ozone, sunlight and oxidation. CSM has excellent

resistance to alcohols, alkalis and acids, very good color sta-

bility with moderate resistance to oils and gasoline. CSM is

not recommended for use with aromatic solvents. CSM has

limited flexibility at low temperatures and relatively poor

compression set. As a result, CSM is not generally manu-

factured as O-rings.

CSM is serviceable to 300°F (149°C).

Hypalon

is offered as an alternative diaphragm elastomer

in Spears

Diaphragm Valves.

PFA/FEP Encapsulated O-rings

O-ring encapsulation places a PFA or FEP material aroun

a FKM elastomer core to provide very high chemical resis-

tance. However, this is not without a trade-off. The PFA/FE

encapsulation is far less resilient than an elastomer and may

not perform as well in certain O-ring applications. PFA/FE

encapsulated O-rings should be used only where an elasto-

mer O-ring cannot meet requirements.

Elastomer Backed PTFE

Used in Spears

PTFE Diaphragm Valves, this chemically

bonded laminate provides the chemical resistance of PTFE

with improved resilience from a thick elastomer backing

for greater sealing capability than solid PTFE Diaphragms.

Use of heavier, high grade EPDM or FKM backing materi-

als eliminates the need for “gas barrier” PTFE Diaphragm

designs.

Metals

Zinc Plated Steel

Zinc plated carbon steel is the standard for general purpose

bolts, nuts and fasteners. Zinc plated steel provides goo

corrosion resistance for most dry environment applications

and normal operating conditions.

Stainless Steel

Stainless Steel provides superior corrosion resistance than

natural or plated carbon steels. Common grade is 18-8,

which is excellent for general purpose use in nuts, bolts an

fasteners. SS302 and SS304 are commonly used in a variety

of sheet stock or deep drawn metal components. SS316 is

the preferred choice for harsh chemical and corrosion envi-

ronments and is used in the majority of Spears

industrial

valves and accessories where stainless steel is required.

PTFE Coated Stainless Steel

Where very high chemical resistance is needed, Spears

offers

a special PTFE coated, stainless steel Butterfly Valve stem. This

tough, chemically bonded coating makes the stem virtually

inert to most chemicals without loss of function or reliability.

Special Alloys (Titanium, Hastelloy

, Alloy 20, etc.)

A variety of specialty metals can be obtained on a custom

order basis for use in Spears

products where specific

chemical or corrosion resistance is required and specified by

user. Please note that custom components generally require

extended lead-time and may have significant costs.