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Plastics & Elastomers
The material selection platform
Plastics & Elastomers

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.



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

Disclaimer: all data and information obtained via the Polymer Selector including but not limited to material suitability, material properties, performances, characteristics and cost are given for information purpose only. Although the data and information contained in the Polymer Selector are believed to be accurate and correspond to the best of our knowledge, they are provided without implied warranty of any kind. Data and information contained in the Polymer Selector are intended for guidance in a polymer selection process and should not be considered as binding specifications. The determination of the suitability of this information for any particular use is solely the responsibility of the user. Before working with any material, users should contact material suppliers in order to receive specific, complete and detailed information about the material they are considering. Part of the data and information contained in the Polymer Selector are genericised based on commercial literature provided by polymer suppliers and other parts are coming from assessments of our experts.

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