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HDT @1.8 Mpa (264 psi)

HDT stands for Heat Deflection Temperature or Heat Distorsion Temperature. Following the ASTM D 648 (which is equivalent to the ISO 75) the HDT is the temperature at which a given polymer test bar will be bended of 0.25 mm under a given load.

In the case of the HDT @ 1.8 MPa the load value is exactly 1820 kPa, which is commonly referenced as 1.8MPa (264 psi). Practically, the test bar is immerged in an oil bath that is heated in such a way that the increase of the bath temperature is continuous (usually 2°C per minute).

The deflection temperature is also sometimes called the 'deflection temperature under load' (DTUL). This temperature gives an estimate of the service temperature a given polymer can withstand. However this is only an estimate, and cannot predict how the final part will perform. Other settings like speed of the temperature increase or even part design will significantly influence the final thermal performance of a given part.

As compared to HDT @ 0.46Mpa, the HDT @ 1.8Mpa is often useful when predicting maximum service temperature of parts submitted to high mechanical loads.

Find commercial grades matching your target using "Property Search - Heat Deflection Temperature" filter in Omnexus Plastics Database:


Omnexus Plastics Database - Property Search


HDT @1.8 Mpa (264 psi) Values of Several Plastics


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Polymer Name Min Value (°C) Max Value (°C)
ABS - Acrylonitrile Butadiene Styrene 88.0 100.0
ABS Flame Retardant 80.0 110.0
ABS High Heat 85.0 120.0
ABS High Impact 80.0 100.0
ABS/PC Blend - Acrylonitrile Butadiene Styrene/Polycarbonate Blend 100.0 110.0
ABS/PC Blend 20% Glass Fiber 115.0 115.0
ABS/PC Flame Retardant 80.0 110.0
Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (High Flow) 240.0 240.0
Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (Standard Flow) 238.0 238.0
Amorphous TPI, High Heat, High Flow, Lead-Free Solderable, 30% GF 254.0 254.0
Amorphous TPI, High Heat, High Flow, Transparent, Lead-Free Solderable (High Flow) 235.0 235.0
Amorphous TPI, High Heat, High Flow, Transparent, Lead-Free Solderable (Standard Flow) 235.0 235.0
Amorphous TPI, Highest Heat, Chemical Resistant, 260°C UL RTI 254.0 254.0
Amorphous TPI, Moderate Heat, Transparent 230.0 230.0
Amorphous TPI, Moderate Heat, Transparent (Food Contact Approved) 217.0 217.0
Amorphous TPI, Moderate Heat, Transparent (Mold Release grade) 230.0 230.0
Amorphous TPI, Moderate Heat, Transparent (Powder form) 230.0 230.0
ASA - Acrylonitrile Styrene Acrylate 75.0 80.0
ASA/PC Blend - Acrylonitrile Styrene Acrylate/Polycarbonate Blend 105.0 110.0
ASA/PC Flame Retardant 115.0 115.0
ASA/PVC Blend - Acrylonitrile Styrene Acrylate/Polyvinyl Chloride Blend 75.0 77.0
CA - Cellulose Acetate 44.0 90.0
CAB - Cellulose Acetate Butyrate 45.0 94.0
CP - Cellulose Proprionate 44.0 110.0
COC - Cyclic Olefin Copolymer 116.0 151.0
CPVC - Chlorinated Polyvinyl Chloride 85.0 110.0
ECTFE - Ethylene Chlorotrifluoroethylene 63.0 67.0
ETFE - Ethylene Tetrafluoroethylene 70.0 100.0
EVA - Ethylene Vinyl Acetate 23.0 23.0
FEP - Fluorinated Ethylene Propylene 48.0 60.0
HDPE - High Density Polyethylene 45.0 60.0
HIPS - High Impact Polystyrene 75.0 80.0
HIPS Flame Retardant V0 80.0 85.0
Ionomer (Ethylene-Methyl Acrylate Copolymer) 40.0 40.0
LCP - Liquid Crystal Polymer 190.0 190.0
LCP Carbon Fiber-reinforced 220.0 220.0
LCP Glass Fiber-reinforced 210.0 240.0
LCP Mineral-filled 180.0 220.0
LDPE - Low Density Polyethylene 30.0 40.0
MABS - Transparent Acrylonitrile Butadiene Styrene 93.0 94.0
PA 11 - (Polyamide 11) 30% Glass fiber reinforced 170.0 170.0
PA 11, Conductive 46.0 46.0
PA 11, Flexible 40.0 50.0
PA 11, Rigid 46.0 53.0
PA 12 (Polyamide 12), Conductive 50.0 50.0
PA 12, Fiber-reinforced 151.0 170.0
PA 12, Flexible 46.0 50.0
PA 12, Glass Filled 60.0 68.0
PA 12, Rigid 45.0 55.0
PA 46 (Polyamide 46) 150.0 155.0
PA 46, 30% Glass Fiber 282.0 285.0
PA 6 - Polyamide 6 60.0 80.0
PA 6-10 - Polyamide 6-10 80.0 85.0
PA 66 - Polyamide 6-6 65.0 105.0
PA 66, 30% Glass Fiber 230.0 255.0
PA 66, 30% Mineral filled 178.0 182.0
PA 66, Impact Modified, 15-30% Glass Fiber 60.0 100.0
PA 66, Impact Modified 60.0 100.0
Polyamide semi-aromatic 88.0 135.0
PAI - Polyamide-Imide 275.0 280.0
PAI - 30% Glass fiber-reinforced 280.0 280.0
PAI -Low Friction 279.0 280.0
PAN - Polyacrylonitrile 66.0 72.0
PAR - Polyarylate 110.0 174.0
PARA - Polyarylamide 30-60% Glass Fiber-reinforced 230.0 230.0
PBT - Polybutylene Terephthalate 50.0 85.0 
PBT, 30% Glass Fiber 195.0 225.0
PC (Polycarbonate) 20-40% Glass Fiber 140.0 150.0
PC (Polycarbonate) 20-40% Glass Fiber Flame Retardant 140.0 150.0
PC - Polycarbonate, high heat 140.0 180.0
PC/PBT Blend - Polycarbonate/Polybutylene Terephthalate Blend 60.0 121.0
PC/PBT blend, Glass Filled 121.0 193.0
PE - Polyethylene 30% Glass Fiber 121.0 121.0
PEEK - Polyetheretherketone 150.0 160.0
PEEK - 30% Carbon Fiber-reinforced 230.0 315.0
PEEK - 30% Glass Fiber-reinforced 230.0 315.0
PEI - Polyetherimide 190.0 200.0
PEI, 30% Glass Fiber-reinforced 200.0 210.0
PEI, Mineral Filled 200.0 210.0
PEKK - Polyetherketoneketone, Low cristallinity grade 139.0 143.0
PESU - Polyethersulfone 195.0 203.0
PESU 10-30% glass fiber 210.0 216.0
PET - Polyethylene Terephthalate 65.0 80.0
PET, 30% Glass Fiber-reinforced 220.0 240.0
PET, 30/35% Glass Fiber-reinforced, Impact Modified 220.0 220.0
PETG - Polyethylene Terephthalate Glycol 63.0 63.0
PFA - Perfluoroalkoxy 90.0 90.0
PHB - Polyhydroxybutyrate 77.0 79.0
PI - Polyimide 240.0 360.0
PMMA - Polymethylmethacrylate/Acrylic 70.0 100.0
PMMA (Acrylic) High Heat 85.0 160.0
PMMA (Acrylic) Impact Modified 70.0 95.0
PMP - Polymethylpentene 49.0 55.0
PMP 30% Glass Fiber-reinforced 149.0 166.0
POM - Polyoxymethylene (Acetal) 110.0 136.0
POM (Acetal) Impact Modified 64.0 90.0
POM (Acetal) Low Friction 118.0 136.0
POM (Acetal) Mineral Filled 100.0 140.0
PP - Polypropylene 10-20% Glass Fiber 90.0 127.0
PP, 10-40% Mineral Filled 50.0 68.0
PP, 10-40% Talc Filled 56.0 75.0
PP, 30-40% Glass Fiber-reinforced 125.0 140.0
PP (Polypropylene) Copolymer 50.0 60.0
PP (Polypropylene) Homopolymer 50.0 60.0
PP, Impact Modified 46.0 57.0
PPA, - Polyphthalamide 120.0 138.0
PPA, 30% Mineral-filled 278.0 280.0
PPA, 33% Glass Fiber-reinforced 296.0 298.0
PPA, 45% Glass Fiber-reinforced 900.0 902.0
PPE - Polyphenylene Ether 90.0 130.0
PPE, 30% Glass Fiber-reinforced 134.0 144.0
PPE, Flame Retardant 90.0 150.0
PPE, Impact Modified 90.0 120.0
PPE, Mineral Filled 90.0 110.0
PPS - Polyphenylene Sulfide 100.0 135.0
PPS, 20-30% Glass Fiber-reinforced 250.0 260.0
PPS, 40% Glass Fiber-reinforced 260.0 270.0
PPS, Conductive 225.0 230.0
PPS, Glass fiber & Mineral-filled 170.0 260.0
PS (Polystyrene) 30% glass fiber 77.0 122.0
PS (Polystyrene) Crystal 70.0 90.0
PS, High Heat 85.0 100.0
PSU - Polysulfone 160.0 174.0
PSU, 30% Glass fiber-reinforced 175.0 185.0
PSU Mineral Filled 175.0 180.0
PTFE - Polytetrafluoroethylene 45.0 50.0
PTFE - 25% Glass Fiber-reinforced 200.0 200.0
PVC (Polyvinyl Chloride), 20% Glass Fiber-reinforced 75.0 78.0
PVC, Plasticized 30.0 53.0
PVC, Plasticized Filled 30.0 53.0
PVC Rigid 54.0 75.0
PVDC - Polyvinylidene Chloride 54.0 65.0
PVDF - Polyvinylidene Fluoride 50.0 125.0
SAN - Styrene Acrylonitrile 90.0 100.0
SAN, 20% Glass Fiber-reinforced 95.0 100.0
SMA - Styrene Maleic Anhydride 35.0 45.0 1.650
SMA, 20% Glass Fiber-reinforced 105.0 120.0 1.650
SMA, Flame Retardant V0 110.0 110.0 1.650
SMMA - Styrene Methyl Methacrylate 80.0 95.0
TPI-PEEK Blend, Ultra-high heat, Chemical Resistant, High Flow, 240°C UL RTI 235.0 235.0
SRP - Polyphenylene (Self reinforced) 154.0 159.0
UHMWPE - Ultra High Molecular Weight Polyethylene 40.0 50.0
XLPE - Crosslinked Polyethylene 40.0 63.0

Find commercial grades matching your target using "Property Search - Heat Deflection Temperature" filter in Omnexus Plastics Database:



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