Phenolic
Phenolic resins
offer cost effective molding while delivering outstanding heat, flame,
steam, UV radiation, moisture and chemical resistance. Phenolics have
a reputation for long term dimensional stability, surface hardness,
rigidity and minimal creep, making them the ideal choice for applications
requiring high ratings for electrical arc and isolation, superior strength
at elevated temperatures and surface abrasion resistance.
MOLDING
Injection molding is the most common method used to process and it yields
the lowest piece price for extended runs. Compression molding is also
used to process Phenolics. Compression molding is most commonly used
for applications requiring metal inserts. Transfer molding is also widely
practiced.
CHEMICAL RESISTANCE
Phenolics
are resistant to common organic solvents (aromatic or aliphatic, polar
or nonpolar, aqueous solutions of salt and halogenated organics such
as carbon tetrachloride and trichloroethane (common cleaning solvents).
Phenolics are also highly resistance to automotive fluids such as brake
fluid, antifreeze, glycol/petro-chemicals/hydrocarbons - including methanol
and some acids and bases.
|
CHEMICAL
RESISTANCE
6 week immersion at 72°F
(23°C) · (% weight gain / surface appearance after exposure)
|
PHENOLIC
COMPOUND
|
|
Sulfuric
Acid 35%
|
2.2
moderate attack
|
|
Nitric
Acid 10%
|
-0.9
moderate attack
|
|
Hydrochloric
Acid 10%
|
-2.4
moderate attack
|
|
Sodium
Hydroxide 10%
|
1.8
strong attack
|
|
Toluene
|
0.1
no change
|
|
Acetone
|
0.1
no change
|
|
Trichloroethylene
|
0.2
no change
|
THERMAL PERFORMANCE
Phenolics excel in retention of mechanical properties up to 400°F (200°C)
and glass transition temperatures of over 572°F (300°C) with proper
post curing. Phenolics have a high arc resistance and UL V-O recognition.
Many grades also have a high self-ignition temperature (about 1112°F/600°C),
a high limiting oxygen index (40-49% 02), low smoke emission and low
coefficient of linear thermal expansion.
PHYSICAL & MECHANICAL
PROPERTIES
Phenolics offer excellent dimensional stability under thermal cycling
and high stress conditions, as well as, low water absorption and high
surface harness. Phenolics are available in high impact grades with
notched Izod impact strengths to 20 ft.-lb./in. (1067J/m), high compressive
strength and low creep under bolt loads, fatigue resistance at elevated
temperatures and thermal expansion coefficients similar to metals.
|
RETENTION
AND CREEP RESISTANCE
(All materials are glass- reinforced with comparable percentages
of glass)
|
|
MATERIAL
|
PHENOLIC
|
EPOXY
|
PPS
|
Compressive
Strength @ 73°F, kpsi
Compressive Strength @ 250°F, kpsi |
42
34
|
30
20
|
31
13
|
Flex
Strength @73°F kpsi
Flex Modulus @73°F, Mpsi |
31
2.6
|
29
2.7
|
33
1.7
|
%
Flex Strength Retention @ 300°F
% Flex Modulus Retention @ 300 °F |
75
92
|
54
49
|
39
18
|
|
MECHANICAL
|
GLASS
FILLED PHENOLIC
|
|
Impact
Strength, ft.lbs/in. notch, side
|
0.60
|
|
Flexural
Modulus, psi
|
2.0
x 106
|
|
Tensile
Strength, psi
|
10,000
|
FORMALATING
There are over 100 commercially available formulations of Phenolic.
For assistance in choosing the right one for your application, please
contact Parkway Products, Inc.
PROCESSING
Phenolic molding compounds are offered as granules, powders or pellets
for injection, compression or transfer molding. Parkway Products, Inc.
is an expert in molding Phenolics and can assist with design, molding,
machining and assembly.
In all new applications
Parkway Products, Inc. should be contacted
to assist with the selection of the most appropriate material and in
the design of parts and tooling.
APPLICATIONS
· Brake Pistons
· Water Pumps
· Power Steering Bushings
· Coil Bobbins
· Motor End Plates
· Oil Filter Adapters
· Cookware Handles
· Electrical Thermal Strips
· Gas Meter Parts |
 |
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