March 13 2017 0Comment
Introduction to Molding Materials

Molding Materials Introduction

Material Features Tensile Strength (psi) Flexural Modulas (psi) Impact Strength (notched izod ft-lb/in) Max Temperature (deflection or softening)

ABS (Acrylonitrile Butadiene Styrene)

  • Good impact resistance
  • Good processability and appearance
  • Dimensional stability
5,000-12,000 270,000-380,000 3.0-7.5 140°-200° F

ABS/PC (Acrylonitrile Butadiene Styrene / Polycarbonate)

  • Good impact resistance
  • Good processability and appearance
  • Dimensional stability
6,400-18,000 300,000-390,000 8-12 140°-210° F

ETPU (Engineered Thermoplastic Polyurethane)

  • Reduced stress cracking
  • Impact resistance
10,000 319,000 10 280° F

HDPE (High Density Polyethylene)

  • Durable
  • Good stiffness
  • Impact resistant
2,900-4,500 100,000-470,000 80 ft-lb/in² 130-250° F

LCP (Liquid Crystal Polymer)

  • High temperature
  • Thin walls acceptable
  • High strength
12,000-32,000 1,300,000-4,600,000 10 525° F

LDPE (Low Density Polyethylene)

  • Good impact strength
  • Crack resistant
  • Excellent flexibility
1,200-4,000 34,000-48,000 130 ft-lb/in² 130-190° F

LLDPE (Linear Low Density Polyethylene)

  • Excellent low temperature flexibility
1400 34,000 190 190° F

PA (Nylon)

  • Temperature resistance
  • Unfilled and glass filled available
6,000-29,000 170,000-1,680,000 2-8 180°-350° F

PBT (Polybutylene Terephthalate)

  • Good chemical resistance
  • Good dimensional stability
  • Low moisture absorption
6,000-17,500 300,000-1,300,000 1-3 200-420° F

PC (Polycarbonate)

  • Impact resistance
  • Dimensional stability
9,000-23,000 335,000-1,600,000 2-18 150-300° F

PC/PBT (Polycarbonate / Polybutylene Terephthalate)

  • Good impact resistance at low temperatures
6300 250,000 17 210° F

PEEK (Polyetheretherketone)

  • Good sterilizability
  • Good chemical resistance
  • High strength and stiffness
  • Creep resistant
13,000-30,000 500,000-1,900,000 3.5-4.5 300°-625° F

PEI (Ultem)(Polyether Imide)

  • High heat resistance
  • High strength and impact resistance
14,000-28,000 480,000-1,800,000 1-2 350-420° F

PET (Thermoplastic Polyester Resin)

  • Good balance of strength, stiffness and toughness
  • Excellent electrical properties and chemical resistance
7,000-23,000 350,000-3,000,000 .5-8 250-470° F

PETG (Copolyester)

  • Good toughness
  • Radiation and E-beam sterilizable
  • High clarity
7250 305,000 3 185° F

PMMA (Acrylic)

  • Optical clarity
  • Rigid
2,800-13,000 221,000-550,000 .25-1 180°-215° F

POM (Acetal or Delrin)

  • Chemical Resistant
  • High tensile strength
6,000-22,000 120,000-170,000 .75-2 180°-300° F

PP (Polypropylene)

  • Best for living hinge
  • Chemical resistant
  • Solvent resistant
3,900-18,500 150,000-1,500,000 0.5-5.5 120°-300° F

PPE/PS (Polyphenylene Ether / High Impact Polystyrene)

  • Low water absorption
  • Hydrolytic stability
  • Suitable for fluid engineering applications
  • Good dimensional stability
8500 384,000 2.5-8 250-280° F

PPS (Polyphenylene Sulfide)

  • Good chemical resistance
  • Good mechanical properties at high temperatures
  • High heat resistance
14,000-28,000 550-2,900,000 .5-6 400-500° F

PS (High Impact Polystyrene)

  • High gloss
  • High impact and stiffness
4,200-11,000 160,000-950,000 .25-7 185-190° F

PSU (Polysulfone)

  • Tough, rigid and high strength
  • Hydrolysis and oxidation resistant
  • Withstands repeated sterilization
  • Highly resistant to mineral acid, alkali and salt solutions
9,500-18,000 390,000-1,500,000 .5-7 300-350° F

SB (Styrene Butadiene)

  • Good stiffness and toughness
  • High clarity
  • Warp resistant
  • Can be used in living hinge
4850 261,000 .5-1 150-160° F

TPE/TPV (Thermoplastic Elastomer)/(Thermoplastic Vulcanizate)

  • Flexible
1,000-7,000 5,000-800,000 200-300° F

TPU (Thermoplastic Polyurethane Elastomer)

  • Abrasion resistant
  • Impact strength
  • Flexible
6,900-12,000 260,000-340,000 .75-10 150-250° F

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