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Table of Plastics Technical Information
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Property Measured
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ASTm Code |
Paramount of Masure |
PTFE(PTFE) |
UHMW-PE |
Nylon 6/6 (Extruded) |
Nylon 6(Cast) |
Acetal |
Polypropylene |
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Tensile Strength @ Break
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D638 |
PSI @ 73oF. |
3800 |
6600 |
11200 |
12000-13000 |
10000 |
4500-6000 |
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Tensile Strength @ Yield
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D638 |
PSI @ 73oF. |
- |
3300 |
8500 |
1200-13000 |
1000 |
4500-5400 |
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Shear Strength
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D732 |
PSI @ 73oF. |
- |
3500 |
9600 |
10000-11000 |
9500 |
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Flexural Mod.
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D790 |
PSI @ 73oF. |
80000 |
17200 |
175000 |
420000-44000 |
380000 |
170000-250000 |
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Compressive Deformation
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D695 |
200 PSI @122 F |
1750 |
10-20 |
14500 |
14000 |
16000-18000 |
6500 |
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Elongation At Break
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D638 |
%@ 73oF. |
100-200 |
350 |
300 |
20-30 |
75 |
100-600 |
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IZOD Impact
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D256 |
Ft.lb./in. |
3 |
32 |
2.1 |
0.7-0.9 |
2.3 |
0.4-1.2 |
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Hardness Shored
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D |
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50-65 |
65 |
89 |
82-85 |
90 |
70-73 |
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Specific Gravity
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D792 |
G/cm3 |
2.1-2.3 |
0.94 |
1.14 |
1.15-1.16 |
1.42 |
0.9-0.91 |
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Coefficient of Friction
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-/dry on steel |
0.05-0.8 |
1-12 |
- |
0.15-0.35 |
0.35 |
- |
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Coefficient of Linear
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Thermal Expansion
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D696 |
in./in./oF. |
5.5*10 Exp-5 |
7.2*10 Exp-5 |
4 *10 Exp-5 |
3.9 *10 Exp-5 |
6.8 *10 Exp-5 |
4.4-5.5 *10 Exp-5 |
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Melting Temperature
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D789 |
oF. |
621±10o |
266o |
518 |
450± |
347 |
336-347 |
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Cont. Service Temperature
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|
oF. |
500o |
160-180o |
180-200o |
230 |
150 |
225-300o |
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Dielectric Strength
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D149 |
Volts/mil. |
480 |
900 |
250 |
430 |
500o |
600 |
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Volume Resistivity
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D257 |
OHM-CM |
10 Exp 18 |
10 Exp 15 |
10 Exp 15 |
10 Exp 16 |
10 Exp 15 |
2*10eXP 17 |
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Dielectric Constant
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D150 |
@ 1KHZ |
2.1 |
23 |
7 |
3.7 |
3.7 |
2.3 |
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Water Absorption
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D570 |
24 hrs @73oF. |
<.01 |
NIL |
1.2 |
0.3-0.4 |
0.25 |
0.01-0.03 |
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Acids, Weak
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@ 73oF. |
S |
S |
L |
S |
S |
S |
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Acids, Strong
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@ 73oF. |
S |
L |
U |
U |
U |
L |
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Alkalies Weak
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@ 73oF. |
S |
S |
S |
S |
S |
S |
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Alkalies, Strong
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@ 73oF. |
S |
S |
S |
S |
U |
S |
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Hydrocarbons
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Aromatic
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@ 73oF. |
S |
L |
S |
S |
S |
U |
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Aliphatic
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@ 73oF. |
S |
S |
S |
S |
S |
U |
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Ketones
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@ 73oF. |
S |
S |
U |
S |
S |
S |
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Ethers
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@ 73oF. |
S |
S |
U |
S |
S |
S |
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Esters
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@ 73oF. |
S |
S |
U |
S |
S |
S |
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Alcohols
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@ 73oF. |
S |
S |
L |
S |
S |
S |
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Inorganic Salt Solutions
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@ 73oF. |
S |
S |
S |
S |
S |
S |
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Continuous Sunlight
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@ 73oF. |
E |
U |
U |
L |
L |
L |
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| E= Excellent - = No information available S= Suitable U= Unsuitable L= Limited acceptability |
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 TOP
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Chemical Resistance Data (not binding)
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Plastic Materials
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Nylon
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Delrin
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PTFE
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Poly
pro
pylene
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Acetylene
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+
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+
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+
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+
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Ethanol
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+
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+
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+
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+
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Etylene glycol
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+
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+
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+
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+
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30% Ammonia
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+
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+
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+
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+
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Ammonium chloride
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+
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+
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+
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+
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Arsenic acid
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+
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+
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+
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+
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(Lead free) gasoline
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+
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+
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+
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±
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High-test gasoline
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+
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+
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+
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±
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Javel water
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-
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+
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-
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-
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Hydrochloric acid
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-
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-
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+
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±
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30% Acetic acid
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-
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±
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+
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+
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Natural gas
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+
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+
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+
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+
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Vinegar
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+
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+
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+
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+
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Greases, etable oil
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+
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+
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+
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+
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Formaldehyde
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±
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+
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+
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+
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Fuel oil
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+
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+
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+
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+
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Isopropanol
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+
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+
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+
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+
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Sea water
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+
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+
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+
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+
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Methanol
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±
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+
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+
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+
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Milk
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+
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+
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+
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+
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Conc. Lactic acid
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-
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+
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+
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+
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Mineral oil
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+
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+
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+
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+
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Caustic soda
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+
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±
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+
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+
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Ozone
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+
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-
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+
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±
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Oil (kerosene)
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+
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+
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+
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+
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Phenol
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*
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-
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+
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+
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Phosphoric acid
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-
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-
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+
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+
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Liquid propane
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+
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+
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+
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+
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Conc. Nitric acid
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-
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-
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+
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+
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Hydrochloric acid
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-
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-
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+
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+
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10% Hydrochloric acid
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-
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-
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+
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+
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95% Fuming sulphuric acid
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*
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-
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+
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±
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Water, spring water
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+
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+
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+
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+
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Hydrogen
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+
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+
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+
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+
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Tanaric acid
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+
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±
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+
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+
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Xylene
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+
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+
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+
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-
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| [+] Resisting |
[±] Resisting Under Reserve |
[-] Non Resisting |
[*] Soluble |
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TOP
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General Product Descriptions
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PTFE
It has qualities that place it at the top of the scale compared to other plastics and materials. PTFE has the lowest coefficient of friction of any solid known and has high heat resistance, up to 500°F. It is chemically inert, requires no lubrication and is moisture resistant. PTFE is manufactured in many variations, using additives such as glass and chemical compounds to give it specific properties for a particular ¬application.
UHMW-PE
UHMW-PE has one of the highest impact strengths of any thermoplastic. It is abrasion ¬resistant, has high tensile strength, displays resistance to stress cracking, and has a good coefficient of friction. It is well-suited where durability and low friction are of paramount importance. Its high resistance to corrosive chemicals, with the exception of oxidizing acids, make it an ideal choice for a wide variety of corrosive environment applications. UHMW-PE can operate successfully at temperatures as low as -375°F making it an excellent material for ¬cryogenic applications. UHMW-PE is available in several grades including USDA/FDA approved natural, ultraviolet safe black, and cross-linked, which offers better wear resistance.
Nylon
Nylon can replace vastly different materials because nylon's toughness and abrasion ¬resistance lie between those of rubber and steel. This combination of properties, rather than ¬superiority in any single area make nylon useful for many different applications Most commonly used are Type 6 (cast) and Type 6/6 (extruded). (Note physical differences above.) Nylon generally absorbs more moisture than other bearing materials and therefore may be dimensionally unstable in wet applications requiring close tolerances. Nylon is also available in oil or MoS2 filled compounds which offer a lower cofficient of friction for bearings and wear ¬parts. Nylon oil filled offers a much high PV rating.
Acetal
Acetal is a generic descriptive name for two polymers, Celcon- a copolymer made by Celaness- and Delrin- a homopolymer made by E.I. Dupont De Nemours. Both materials offer ¬excellent machining properties and are both dimensionally stable making them ideal for holding close tolerances. The high compression strength and stiffness of acetal also make it a good material for high-load applications. Natural Acetal is USDA/FDA approved.
Polypropylene
This material has high impact and chemical resistance. It has a 50% higher temperature rating than UHMW at the same cost. It is also lightweight and dimensionally stable - good for low-cost fabrications.
Disclaimer
These values are typical test results taken from a variety of sources for which Nitin Enterprise accepts no responsibility not makes any claims regarding suitability for a particular purpose of use.
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TOP
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Plastic BALLS
Available Grades & Tolerances
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Ref-Grade
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Basic diameter tolerances in mm
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um
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Sphericity in mm
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um
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A - 0
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0.02 mm
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20
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0.01
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10
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B - I
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0.04 mm
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40
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0.02
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20
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C - II
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0.08 mm
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80
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0.04
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40
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D - III
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0.20 mm
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200
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0.20
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200
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TOP
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MATERIALS
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| Specification |
Trade Names |
Properties |
Grades |
General Product Description |
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POLYTETRA-FLUORETHYLENE(PTFE)
|
PTFE
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Specific gravity: 2.2
Shore hardness (D) 60
Colour: White
Max temperature resistance: 260°C
Water absorption: 0%
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0
I
II
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Non-friction material, resistant to most corrosive reagents, electrically non conductive. PTFE is particularly suitable for criogenic liquid and acid
- handling apparatus.
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UHMW-PE
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Ultra High
Modicular
Weight
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Specific gravity: 0.94
Shore hardness (D) 65
Colour: White
Max temperature resistance: 75°C
Water absorption: NIL
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0
I
II
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Pure 100% virgin UHMW-PE has one of the highest impact strengths of any thermoplastic. It is well-suited where duraoility and low friction are of paramount importance. It has been accepted for use in food and pharmaceutical processing equipment by the USDA and FDA. It is an excellent, general purpose material, causing no undersireable tast, smell or discoloration.
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POLYOXY
METHANE
(POM)
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Delrin
Acetal
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Specific gravity: 1,45
Shore hardness (D) 80
Colour: White
Max temperature resistance: 100°C
Water absorption: 0,48%
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0
I
II
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As nylon but slightly harder and denser. Suggested to those application where these properties and low water absorption are required.
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POLYAMIDE - A(PA)
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Nylon 6,
6/6 Zytel
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Specific gravity: 1,14
Shore hardness (D) 80
Colour: Off-white
Max temperature resistance: 100°C
Water absorption: 1,50%
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0
I
II
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Nylon balls used in check valves, light load berings, toggle switches and knobs as well as in numerous special applications where low cost and resiliency, are more important than hardness. Nylon has good resistance to alkalis, petroleum products and most mild chemicals.
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POLYPROPYLENE(PP)
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Moplen
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Specific gravity: 0,91
Shore hardness (D) 80
Colour: Green \
Max temperature resistance: 80°C
Water absorption:0,0.1 %
|
I
II
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Low weight and low water absorption. They are used in fluid level gauges, flowmeters, valves, blood transfusion kits, vapor and evaporation shields in electrolityc solutions and all applications requiring good corrosion resistance.
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Rubber
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Nitrile
Rubber
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Shore hardness (A) 70
Colour: Black
Max temperature resistance: 120°C
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I
II
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Soft 70 durometer buna-n nitrile compound highly recommended for all typical applications where the ball is exposed to a variety of popular hydraulics fluids or water. Balls are ground to very close tolerances to provide outstanding performance in critical sealing applications.
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