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Plastics Technical Information

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Chemical Resistance

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General Product Descriptions

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Plastic Balls

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Available Grades & Tolerances

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Materials


Table of Plastics Technical Information

Property Measured

ASTm Code Paramount of Masure PTFE(PTFE) UHMW-PE Nylon 6/6 (Extruded) Nylon 6(Cast) Acetal Polypropylene

 

               

Tensile Strength @ Break

D638 PSI @ 73oF. 3800 6600 11200 12000-13000 10000 4500-6000

 

               

Tensile Strength @ Yield

D638 PSI @ 73oF. - 3300 8500 1200-13000 1000 4500-5400

 

               

Shear Strength

D732 PSI @ 73oF. - 3500 9600 10000-11000 9500  

 

               

Flexural Mod.

D790 PSI @ 73oF. 80000 17200 175000 420000-44000 380000 170000-250000

 

               

Compressive Deformation

D695 200 PSI @122 F 1750 10-20 14500 14000 16000-18000 6500

 

               

Elongation At Break

D638 %@ 73oF. 100-200 350 300 20-30 75 100-600

 

               

IZOD Impact

D256 Ft.lb./in. 3 32 2.1 0.7-0.9 2.3 0.4-1.2

 

               

Hardness Shored

D   50-65 65 89 82-85 90 70-73

 

               

Specific Gravity

D792 G/cm3 2.1-2.3 0.94 1.14 1.15-1.16 1.42 0.9-0.91

 

               

Coefficient of Friction

  -/dry on steel 0.05-0.8 1-12 - 0.15-0.35 0.35 -

 

               

Coefficient of Linear

               

 

               

Thermal Expansion

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

 

               

Melting Temperature

D789 oF. 621±10o 266o  518 450± 347 336-347

 

               

Cont. Service Temperature

  oF. 500o 160-180o 180-200o 230 150 225-300o

 

               

Dielectric Strength

D149 Volts/mil. 480 900 250 430 500o 600

 

               

Volume Resistivity

D257 OHM-CM 10 Exp 18 10 Exp 15 10 Exp 15 10 Exp 16 10 Exp 15 2*10eXP 17

 

               

Dielectric Constant

D150 @ 1KHZ 2.1 23 7 3.7 3.7 2.3

 

               

Water Absorption

D570 24 hrs @73oF. <.01 NIL 1.2 0.3-0.4 0.25 0.01-0.03

 

               

Acids, Weak

  @ 73oF. S S L S S S

 

               

Acids, Strong

  @ 73oF. S L U U U L

 

               

Alkalies Weak

  @ 73oF. S S S S S S

 

               

Alkalies, Strong

  @ 73oF. S S S S U S

 

               

Hydrocarbons

               

Aromatic

  @ 73oF. S L S S S U

 

               

Aliphatic

  @ 73oF. S S S S S U

 

               

Ketones

  @ 73oF. S S U S S S
                 

Ethers

  @ 73oF. S S U S S S

 

               

Esters

  @ 73oF. S S U S S S
                 

Alcohols

  @ 73oF. S S L S S S

 

               

Inorganic Salt Solutions

  @ 73oF. S S S S S S

 

               

Continuous Sunlight

  @ 73oF. E U U L L L
E= Excellent               - = No information available       S= Suitable          U= Unsuitable        L= Limited acceptability
 

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Chemical Resistance Data (not binding)

 

Plastic Materials

Nylon

Delrin

PTFE

Poly
pro
pylene

 

Acetylene

+

+

+

+

         

Ethanol

+

+

+

+

         

Etylene glycol

+

+

+

+

         

30% Ammonia

+

+

+

+

         

Ammonium chloride

+

+

+

+

         

Arsenic acid

+

+

+

+

         

(Lead free) gasoline

+

+

+

±

         

High-test gasoline

+

+

+

±

         
         

Javel water

-

+

-

-

         

Hydrochloric acid

-

-

+

±

         

30% Acetic acid

-

±

+

+

         

Natural gas

+

+

+

+

         

Vinegar

+

+

+

+

         

Greases, etable oil

+

+

+

+

         

Formaldehyde

±

+

+

+

         

Fuel oil

+

+

+

+

         

Isopropanol

+

+

+

+

         

Sea water

+

+

+

+

         

Methanol

±

+

+

+

         

Milk

+

+

+

+

         

Conc. Lactic acid

-

+

+

+

         

Mineral oil

+

+

+

+

         

Caustic soda

+

±

+

+

         

Ozone

+

-

+

±

         

Oil (kerosene)

+

+

+

+

         

Phenol

*

-

+

+

         

Phosphoric acid

-

-

+

+

         

Liquid propane

+

+

+

+

         

Conc. Nitric acid

-

-

+

+

         

Hydrochloric acid

-

-

+

+

         

10% Hydrochloric acid

-

-

+

+

         

95% Fuming sulphuric acid

*

-

+

±

         

Water, spring water

+

+

+

+

         

Hydrogen

+

+

+

+

         

Tanaric acid

+

±

+

+

         

Xylene

+

+

+

-

 
[+] Resisting [±] Resisting Under Reserve [-] Non Resisting [*] Soluble
 

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General Product Descriptions

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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Plastic BALLS

Available Grades & Tolerances

Ref-Grade

Basic diameter tolerances in mm

um

Sphericity in mm

um

A - 0

0.02 mm

20

0.01

10

 

 

 

 

 

B - I

0.04 mm

40

0.02

20

 

 

 

 

 

C - II

0.08 mm

80

0.04

40

 

 

 

 

 

D - III

0.20 mm

200

0.20

200

 

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MATERIALS

Specification Trade Names Properties Grades General Product Description

POLYTETRA-FLUORETHYLENE(PTFE)

PTFE

Specific gravity: 2.2

Shore hardness (D) 60

Colour: White

Max temperature resistance: 260°C

Water absorption: 0%

0

I

II

Non-friction material, resistant to most corrosive reagents, electrically non conductive. PTFE is particularly suitable for criogenic liquid and acid
- handling apparatus.

         

UHMW-PE

Ultra High
Modicular
Weight

Specific gravity: 0.94

Shore hardness (D) 65

Colour: White

Max temperature resistance: 75°C

Water absorption: NIL

0

I

II

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.

POLYOXY
METHANE
(POM)

Delrin
Acetal

Specific gravity: 1,45

Shore hardness (D) 80

Colour: White

Max temperature resistance: 100°C

Water absorption: 0,48%

0

I

II

As nylon but slightly harder and denser. Suggested to those application where these properties and low water absorption are required.

         

POLYAMIDE - A(PA)

Nylon 6,
6/6 Zytel

Specific gravity: 1,14

Shore hardness (D) 80

Colour: Off-white

Max temperature resistance: 100°C

Water absorption: 1,50%

0

I

II

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.

         

POLYPROPYLENE(PP)

Moplen

Specific gravity: 0,91

Shore hardness (D) 80

Colour: Green \

Max temperature resistance: 80°C

Water absorption:0,0.1 %

I

II

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.

         

Rubber

Nitrile

Rubber

Shore hardness (A) 70

Colour: Black

Max temperature resistance: 120°C

I

II

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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