Claremont Polymer Shapes - Plastic and metal parts manufacturer, Ontario, Canada.Claremont Polymer Shapes - Plastic and metal parts manufacturer, Ontario, Canada.
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P E T (POLY(ETHYLENE TEREPHTHALATE))
ERTALYTER   ARNITER   MYLARR

PET Dough Piston
Machined PET Dough Piston
to replace a moulded part
that is no longer available
SPECIFICATIONS:
FDA TITLE 21 CFR 177.1630
ASTM D4507 GROUP 2

NATURAL COLOUR: WHITE

As a second generation of POLYESTERS, these materials, unlike the Thermoset POLYESTERS covered in the FRP section, are semi-crystalline THERMOPLASTICS and much more easily processed by moulding and extrusion. Long known as high strength man-made fibres such as TERYLENER, DACRONR and FORTRELR; PET has recently, through advances in processing and machinery, become an important material. PET containers for beverages such as soft drinks, bottled water, juice, etc. show what a tough and strong material this food-approved resin is. As a crystalline, engineering polymer, PET possesses considerably higher tensile, load bearing and temperature resistance properties along with a much lower coefficient of thermal expansion than the other major engineering plastics like Acetals and Nylons. As well, PET has better machinability than any other THERMOPLASTIC. PET has low notch impact strength and should not be used for parts with under-cuts, cutouts, etc., subject to impact, unless generous radii are provided for in order to disperse the stress of impact.


P B T(POLY(BUTYLENE TEREPHTHALATE))
VALOXR GAFITER

SPECIFICATIONS
ASTM D4507 GROUP 1
FDA TITLE 21 CFR 177.1660

NATURAL COLOUR: OFF-WHITE (CLEAR IN THIN SECTIONS)

PBT is somewhat lower in physical strength and temperature resistant than PET; but, under certain loading conditions, at higher temperatures, PBT has higher stiffness than PET. As well PBT has frictional properties very similar to Acetal and slightly lower than PET; but does not have the high PV limits of PET. And PBT absorbs slightly less moisture but is slightly less chemically resistant than PET. PBT is a tougher material than PET and possesses reduced notch sensitivity. When the appearance of centerline porosity in Acetal Homopolymer is objectionable both PBT and PET, not possessing this appearance, are available. The machinability of PBT while quite good is slightly lower than PET and Acetal.

POLYESTER ELASTOMER
ARNITELR HYTRELR

SPECIFICATIONS
ASTM D4550

NATURAL COLOUR: OFF-WHITE

This highly specialized material is a THERMOPLASTIC having appropriate methods of processing, but with rubbery characteristics. Hence, the ultimate cost of elastomeric parts is lower. Like true elastomers, these materials possess resilience, low creep, resistance to impact and flex-fatigue resistance. Also, POLYESTER ELASTOMERS have very good resistance to oils, fuels, solvents and chemicals; but have only fair resistance to dilute acids and bases; and are attacked by concentrated acids and bases. The low temperature brittleness point is far lower than conventional rubbers and retention of properties after radiation exposure is better than most rubbers. POLYESTER ELASTOMERS have much better hydrolytic stability than Urethanes; in similar hardness products, load-bearing properties are better than Urethanes and tensile properties at elevated temperatures are also better.

GENERAL PROPERTIES
  ASTM
test
P E T P B T P B T
(30%
Glass
Filled)
HytrelR
5556
SPECIFIC GRAVITY   D792 1.39 1.31 1.53 116
TENSILE STRENGTH psi D638 12000 7500 17300 2800
TENSILE MODULUS 105 psi D638 4.7 3.1 13.0 0.335
ELONGATION % D638 45 200 5 550
FLEXURAL STRENGTH psi D790 17500 12000 27500 3500
FLEXURAL MODULUS 105 psi D790 4.7 3.4 11.0 0.55
COMPRESSIVE STRENGTH 10% psi D695 14500 13000 18000  
COMPRESSIVE MODULUS 105 psi D695 4.1 3.8 7.0  
HARDNESS rockwell M D785 M90 M79    
  rockwell R       R118  
  shore A         90A
IMPACT STRENGTH (1/2" x 1/2") ft-lb/inch of notch D256 0.8 1.0 1.0 No Break
THERMAL EXPANSION 10-5/F D696 3.9 5.0 1.4 10.0
HEAT RESISTANCE
(continuous in air)
F   215 210 250 210
DEFLECTION TEMPERATURE   D648        
@ 264 psi F   175 130 405 115
@ 66 psi F   240 310 420 176
DIELECTRIC STRENGTH v/mil D149 600 400 475 400
DIELECTRIC CONSTANT   D150 3.0 to 3.3 3.0 to 3.3 3.6 to 3.9  
DISSIPATION FACTOR 10-3 D150 7 to 20 15 to 25 2 to 20  
WATER ABSORPTION 24hrs % D570 0.10 0.08 0.06 0.19
FLAMMABILITY in/min D635 0.37 0.36 0.28  
BEARING PROPERTIES          
WEAR FACTOR, 'K' 10-10-in3-min
ft-lb-hr
D3702 195 210   41977
COEFFICIENT of FRICTION (DRY)            
against self - static 40 psi   0.19 0.17    
against self - dynamic 40 psi/50fpm   0.25 0.24    
against steel - static 40 psi   0.21 0.19   0.27
against steel - dynamic 40 psi/50fpm   0.26 0.25   0.59
LIMITING PV lb-ft/in2-min @10fpm 5800 2600 N/A N/A
    @40fpm 4600 2400 N/A N/A
    @100fpm 4100 2200 N/A N/A
    @400fpm 3700 2800 N/A N/A
    @1000fpm N/A N/A N/A N/A
PLEASE NOTE:
Values shown in the above table are averages and there will be variances from lot to lot. After selecting a material based upon these values, you must conduct tests specific to your application to be assured the material suits your needs.

The maximum sliding speed for THERMOPLASTICS like PET, Nylons, Acetals, etc., running dry, mating against another surface is generally taken to be 400 feet per minute. Above that point, since polymers do not conduct heat well, the heat of friction building up in the part is not dissipated. Ultimately, the part fails by melting. If the part contacts metal, the boundary between the metal and the polymer, where heat transfer could occur, will be intact. The part will have melted internally. If mating with another polymer part, the one with the lower melting point will have failed first with the two probably fused together. Constant lubrication will reduce this tendency and increase the maximum possible surface speed for your part. This has to be determined by testing. You can learn more about internal lubricants and reinforcing materials on various polymers by contacting Claremont Polymer Shapes.