Materials and Specifications

Materials and Specifications

PROPERTIES Polyethylene
Low-Density
Polyethylene
Medium-Density
Polyethylene
High-Density
Relative density 0.910-0.925 0.926-0.940 0.941-0.965
Tensile Strength, Mpa 4-16 8.24 20-38
(psi) (600-2300) (1200-3500) (3100-5500)

Resistance to heat

Celsius (C)

80-100°C

105-120°C

Farenheight (F)

(180-212°F) (220-250°F) (250°F)
Effect of sunlight Crazes-must be stablilized Crazes-must be stablilized Crazes-must be stablilized
Effect of acids Oxidizing acids Oxidizing acids Oxidizing acids
Effect of alkalies Resistant Resistant Resistant
Effect of solvents Resistant (below 60°C) Resistant (below 60°C) Resistant (below 60°C)
Optical qualities

Transparent to opaque Transparent to opaque Transparent to opaque

PROPERTIES Polytetrafluoroethyline
(PTFE)
Polyfluroethylenepropylene
(PFEP)
Relative density 2.14-2.2 2.12-2.17
Tensile Strength, Mpa 14-35 19-21
(psi) (2000-5000) (2700-3100)
Resistance to heat C 287°C 205°C
( F) (550°F) (400°F)
Effect of sunlight None None
Effect of acids None None
Effect of alkalies None None
Effect of solvents None None
Optical qualities

Opaque Transparent

PROPERTIES Polyvinyls
Rigid Vinyl Chloride (PCV)
Polysulfone
(Unfilled)
Relative density 1.30-1.45 1.24
Tensile Strength, Mpa 34-62 70
(psi) (5000-9000) (10200)
Resistance to heat C 65-80°C 150-175°C
( F) (150-175°F) (300-345°F)
Effect of sunlight Needs stablilizer Strength loss, yellows slightly
Effect of acids None to slight None
Effect of alkalies None None
Effect of solvents Soluble in ketones & esters Partly soluble in aromatic hydrocargons
Optical qualities

Transparent Transparent to opaque

PROPERTIES Polypropylene
Homopolymer (Unmodified)
Polyvinyl Fluoride
(PVF)
Relative density 0.902-0.906
Tensile Strength, Mpa 31-38 58-124
(psi) (4500-5500)
Resistance to heat C 110-150°C 146°C
( F) (225-300°F) (300°F)
Effect of sunlight Crazes-must be stablilized Slight bleach
Effect of acids Oxidizing acids Attacked by fuming sulfuric
Effect of alkalies Resistant None
Effect of solvents Resistant (below 80°C) Resists most
Optical qualities

Transparent to opaque Transparent

PROPERTIES Polyamides
Nylon 6,6 (Unfilled)
Polyamides
Nylon 6,10 (Unfilled)
Polyamides
Nylon 6, 10 (Glass-Filled)
Relative density 1.13-1.15 1.09 1.17-1.52
Tensile Strength, Mpa 62-82 58-60 89-240
(psi) (9000-12000) (8500-8600) (13000-35000)
Resistance to heat C 80-150°C 80-120°C 150-205°C
( F) (180-300°F) (180-250°F) (300-400°F)
Effect of sunlight Discolors slightly Discolors slightly Discolors slightly
Effect of acids Attacked Attacked Attacked
Effect of alkalies Resistant None None
Effect of solvents Dissolved by phenol &
formic acid
Dissolved by phenols Dissolved by phenols
Optical qualities

Translucent to opaque Translucent to opaque Translucent to opaque

PROPERTIES Polychlorotrifluoroethylene
(PCTFE)
Relative density 2.1-2.2
Tensile Strength, Mpa 30-40
(psi) (4500-6000)
Resistance to heat C 175-199°C
( F) (350-390°F)
Effect of sunlight None
Effect of acids None
Effect of alkalies None
Effect of solvents None
Optical qualities Translucent to opaque

  • Polyethylene

    • Advantages

      • Low cost (except UHMWPE)
      • Excellent dielectric properties
      • Moisture resistance
      • Very good chemical resistance
      • Available in food grades
      • Processable by all thermoplastic methods (except HMWHPE and UHMWPE)
    • Disadvantages

      • High thermal expansion
      • Poor weathering resistance
      • Subject to stress cracking (except UHMWPE)
      • Difficulty in bonding
      • Flammable

  • Polytetrafluoroethylene (PTFE)

    • Advantages

      • Nonflammable
      • Outstanding chemical and solvent resistance
      • Excellent weatherability
      • Low friction co-efficient (anti-stick property)
      • Wide thermal service range
      • Very good electrical properties
    • Disadvantages

      • Not processable by common thermoplastic methods
      • Toxic in thermal degradation
      • Subject to creep
      • Permeable
      • Requires high processing temperatures
      • Low Strength
      • High density
      • Comparativey high cost

  • Polyfluoroethylenepropylene (PFEP)

    • Advantages

      • Processable by normal thermoplastic methods
      • Resistant to chemical (including oxidizing agents)
      • Excellent solvent resistance
      • Anti-stick characteristics
      • Nonflammable
      • Low co-efficient of friction, dilectric constant, mod shrinkage, and water absorption
    • Disadvantages

      • Comparatively high cost
      • High density
      • Subject to creep
      • Low compressive and tensile strength
      • Low stiffness
      • Toxic upon thermal decomposition

  • Polyvinyl Chloride (PCV)

    • Advantages

      • Processable by thermoplastic methods
      • Wide range of flexibility (by varying levels of plasticizers)
      • Nonflammable
      • Dimensional stability
      • Comparatively low cost
      • Good resistance to weathering
    • Disadvantages

      • Subject to attack by several solvents
      • Limited thermal capability
      • Thermal decomposition evolves HC1

  • Polysulfones

    • Advantages

      • Good thermal stability
      • Excellent high-temperature creep resistance
      • Transparent
      • Tough and rigid
      • Processable by thermoplastic methods
    • Disadvantages

      • Subject to attack by many solvents
      • Poor weatherability
      • Subject to stress cracking
      • High processing temperature

  • Polypropylene

    • Advantages

      • Processable by all thermoplastic methods
      • Low co-efficient of friction
      • Excellent electrical insulation
      • Good fatigue resistance
      • Excellent moisture resistance
      • First rate abrasion resistance
      • Good grade availability
      • Service temperature to 126°C (260°F)
      • Very good chemical resistance
      • Excellent flexural strength
      • Good impact strength
    • Disadvantages

      • Broken down by ultraviolet radiation
      • Poor weatherability

  • Polyvinyl Fluoride

    • Advantages

      • Processable by thermoplastic methods
      • Low permeability
      • Flame retardance
      • Good solvent resistance
    • Disadvantages

      • Lower thermal capability than highly fluorinated polymers
        Toxic (in thermal decomposition)
        High dipole bond
        Subject to attack by strong acids

  • Polyamide (Nylon)

    • Advantages

      • Tough, strong and impact resistant
      • Low co-efficient of friction
      • Abrasion resistance
      • High Temperature resistance
      • Processable by thermoplastic methods
      • Good solvent resistance
      • Resistant to bases
    • Disadvantages

      • High moisture absorption with related dimensional instability
      • Subject to attack by strong acids and oxidizing agents
      • Requires ultraviolet stabilization
      • High shrinkage in molded sections
      • Electrical and mechanical properties influenced by moisture content

  • Polychlorotrifluoroethylene (PCTFE)

    • Advantages

      • Excellent solvent resistance
      • Optically clear
      • Zero moisture absorption
      • Self-extinguishing
      • Low permeability
      • Creep resistance better than PTFE of PFEP
      • Very low co-efficient of friction
      • Good low temperature capability
    • Disadvantages

      • Lower electrical properties than PTFE
      • More difficult to mold than PFEP
      • Crystallizes upon slow cooling
      • Less solvent resistance than PTFE and PFEP
      • Higher co-efficient of friction than PTFE and PFEP

Contact Us

Phone: (203) 294-4440
Fax: (203) 294-7899

sales@dexmet.com

22 Barnes Industrial Rd. So.
Wallingford, CT 06492
United States of America

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