Filament heat resistance: HDT and Vicat values from manufacturer data sheets

Published October 15, 202676 sources

Short answer

Heat deflection temperature (HDT) is the temperature at which a loaded test bar bends by a set amount; data sheets report it under 0.45 MPa, 1.8 MPa or both, usually to ISO 75 ^{[1, 2]}. Compare values only at the same load. At 0.45 MPa the database spans 50–61 °C for PLA, 64–73 °C for PETG, 73–101 °C for ABS, 88–103 °C for ASA and 101–114 °C for PC, with carbon-fiber nylons reaching the highest values.

By material

The span of values each manufacturer group publishes, computed from the product table below. "Products" counts entries in the database; "reporting" counts those whose maker publishes this value.

Material	Reporting / products	HDT at 0.45 MPa, °C	HDT at 1.8 MPa, °C
PLA	26 / 26	50–61	52–59
PETG	9 / 9	64–73	62–68
ABS	7 / 7	73–101	84–99
PA-CF	7 / 7	84.5–215	82.5–173
ASA	6 / 6	88–103	86–100
PC	5 / 5	101–114	93–117
PA (nylon)	4 / 4	58.7–119	49.9–73.5
PETG-CF	4 / 4	68.6–96	65.7–80
PLA-CF	2 / 2	53–55	54
ABS-CF	1 / 1	99	94
ABS-GF	1 / 1	not published	not published
ASA-GF	1 / 1	98	94
Other	1 / 1	63	58
PC-CF	1 / 1	114	106
PET-CF	1 / 1	86.7	76.6
PET-GF	1 / 1	78	74
TPU	1 / 1	not published	78.6

Every product that publishes this value

78 products from 8 brands. Sorting puts "not published" last.

					Source
Bambu Lab	PLA Basic	PLA	57 °C @ 0.45 MPa 54 °C @ 1.8 MPa	57	^{[1, 6]}
Bambu Lab	PLA Matte	PLA	58 °C @ 0.45 MPa 52 °C @ 1.8 MPa	63	^{[6, 7]}
Bambu Lab	PLA Silk+	PLA	60 °C @ 0.45 MPa 56 °C @ 1.8 MPa	66	^[8]
Bambu Lab	PLA Tough+	PLA	61 °C @ 0.45 MPa 58 °C @ 1.8 MPa	62	^[9]
Bambu Lab	PLA-CF	PLA-CF	55 °C @ 0.45 MPa 54 °C @ 1.8 MPa	69	^[10]
Bambu Lab	PETG Basic	PETG	71 °C @ 0.45 MPa 68 °C @ 1.8 MPa	69	^[11]
Bambu Lab	PETG HF	PETG	69 °C @ 0.45 MPa 62 °C @ 1.8 MPa	70	^{[6, 12]}
Bambu Lab	PETG-CF	PETG-CF	74 °C @ 0.45 MPa 68 °C @ 1.8 MPa	85	^[13]
Bambu Lab	ABS	ABS	87 °C @ 0.45 MPa 84 °C @ 1.8 MPa	94	^[14]
Bambu Lab	ASA	ASA	100 °C @ 0.45 MPa 92 °C @ 1.8 MPa	106	^[15]
Bambu Lab	PAHT-CF	PA-CF	194 °C @ 0.45 MPa 170 °C @ 1.8 MPa	220	^[16]
Bambu Lab	PC	PC	112 °C @ 0.45 MPa 117 °C @ 1.8 MPa	119	^[17]
Elegoo	PLA	PLA	57 °C @ 0.45 MPa	62	^[18]
Elegoo	PLA Plus	PLA	56 °C @ 0.45 MPa	63	^[19]
Elegoo	Rapid PLA Plus	PLA	57 °C @ 0.45 MPa	62	^[20]
Elegoo	PLA Matte	PLA	55 °C @ 0.45 MPa	63	^[21]
Elegoo	PLA Silk	PLA	54 °C @ 0.45 MPa	58	^[22]
Elegoo	PETG Pro	PETG	73 °C @ 0.45 MPa	71	^[23]
Elegoo	Rapid PETG	PETG	72 °C @ 0.45 MPa	70	^[24]
Elegoo	ABS	ABS	85 °C @ 0.45 MPa	86	^[25]
Elegoo	ASA	ASA	99 °C @ 0.45 MPa	102	^[26]
Elegoo	PC	PC	109 °C @ 0.45 MPa	119	^[27]
Elegoo	PAHT-CF	PA-CF	194 °C @ 0.45 MPa	225	^[28]
eSUN	PLA+	PLA	53 °C @ 0.45 MPa	not published	^[29]
eSUN	PLA-Matte	PLA	51 °C @ 0.45 MPa	not published	^[29]
eSUN	PLA-Silk	PLA	50 °C @ 0.45 MPa	not published	^[29]
eSUN	PLA+HS	PLA	54 °C @ 0.45 MPa	not published	^[29]
eSUN	PLA-CF	PLA-CF	53 °C @ 0.45 MPa	not published	^[29]
eSUN	PETG	PETG	64 °C @ 0.45 MPa	not published	^[29]
eSUN	PETG-Basic	PETG	73 °C @ 0.45 MPa	not published	^[29]
eSUN	ABS+	ABS	73 °C @ 0.45 MPa	not published	^[29]
eSUN	ASA+	ASA	88 °C @ 0.45 MPa	not published	^[29]
eSUN	PA-CF	PA-CF	155 °C @ 0.45 MPa	not published	^[29]
Overture	ABS	ABS	98 °C	103.4	^{[30, 31]}
Polymaker	PolyLite PLA	PLA	60 °C @ 0.45 MPa 58 °C @ 1.8 MPa	63	^{[2, 32]}
Polymaker	PLA Pro	PLA	58.1 °C @ 0.45 MPa 55.6 °C @ 1.8 MPa	63.5	^{[32, 33]}
Polymaker	PolySonic PLA	PLA	53 °C @ 0.45 MPa 52 °C @ 1.8 MPa	61	^{[32, 34]}
Polymaker	PETG	PETG	69 °C @ 0.45 MPa 65 °C @ 1.8 MPa	75	^[35]
Polymaker	PolyLite ABS	ABS	100 °C @ 0.45 MPa 98 °C @ 1.8 MPa	104	^[36]
Polymaker	ASA	ASA	103 °C @ 0.45 MPa 100 °C @ 1.8 MPa	105	^[37]
Polymaker	PolyMide CoPA	PA (nylon)	111 °C @ 0.45 MPa 70 °C @ 1.8 MPa	180	^[5]
Polymaker	PolyMax PC	PC	114 °C @ 0.45 MPa 99 °C @ 1.8 MPa	117	^[38]
Polymaker	Fiberon PA6-CF20	PA-CF	215 °C @ 0.45 MPa 173 °C @ 1.8 MPa	219.2	^[39]
Polymaker	Fiberon PETG-rCF08	PETG-CF	68.6 °C @ 0.45 MPa 65.7 °C @ 1.8 MPa	81.6	^[40]
Prusament	PLA	PLA	55 °C @ 0.45 MPa 55 °C @ 1.8 MPa	not published	^{[3, 41]}
Prusament	PLA Blend	PLA	55 °C @ 0.45 MPa 52.5 °C @ 1.8 MPa	not published	^[42]
Prusament	PLA High Speed	PLA	57 °C @ 0.45 MPa 55 °C @ 1.8 MPa	not published	^[43]
Prusament	rPLA Natural Pigments	PLA	61 °C @ 0.45 MPa 59 °C @ 1.8 MPa	not published	^{[41, 44]}
Prusament	PETG	PETG	68 °C @ 0.45 MPa 68 °C @ 1.8 MPa	not published	^{[41, 45]}
Prusament	PETG Carbon Fiber	PETG-CF	96 °C @ 0.45 MPa 80 °C @ 1.8 MPa	not published	^{[41, 46]}
Prusament	ASA	ASA	93 °C @ 0.45 MPa 86 °C @ 1.8 MPa	not published	^{[41, 47]}
Prusament	PC Blend	PC	113 °C @ 0.45 MPa 93 °C @ 1.8 MPa	not published	^{[41, 48]}
Prusament	PC Blend Carbon Fiber	PC-CF	114 °C @ 0.45 MPa 106 °C @ 1.8 MPa	not published	^{[41, 49]}
Prusament	PA11 Carbon Fiber	PA-CF	192 °C @ 0.45 MPa 152 °C @ 1.8 MPa	not published	^{[41, 50]}
Prusament	PA11	PA (nylon)	58.7 °C @ 0.45 MPa 49.9 °C @ 1.8 MPa	not published	^[51]
Prusament	PVB	Other	63 °C @ 0.45 MPa 58 °C @ 1.8 MPa	not published	^{[41, 52]}
Prusament	TPU 95A	TPU	78.6 °C @ 1.8 MPa	101.6	^{[41, 53]}
Siraya Tech	Fibreheart PET-CF	PET-CF	86.7 °C @ 0.45 MPa 76.6 °C @ 1.8 MPa	220	^[54]
Siraya Tech	Fibreheart PETG-CF Pro	PETG-CF	75 °C @ 0.45 MPa 69 °C @ 1.8 MPa	85	^{[55, 56]}
Siraya Tech	Fibreheart PET-GF	PET-GF	78 °C @ 0.45 MPa 74 °C @ 1.8 MPa	150	^[57]
Siraya Tech	Fibreheart PPA	PA (nylon)	81 °C @ 0.45 MPa 73.5 °C @ 1.8 MPa	230	^[58]
Siraya Tech	Fibreheart PPA-CF	PA-CF	84.5 °C @ 0.45 MPa 82.5 °C @ 1.8 MPa	230	^[59]
Siraya Tech	Fibreheart PPA-CF Core	PA-CF	97 °C @ 0.45 MPa 84 °C @ 1.8 MPa	238	^[60]
Siraya Tech	Fibreheart ABS-CF	ABS-CF	99 °C @ 0.45 MPa 94 °C @ 1.8 MPa	99	^[61]
Siraya Tech	Fibreheart ABS-GF	ABS-GF	93 °C 97 °C	106	^[62]
Siraya Tech	Fibreheart ASA-GF	ASA-GF	98 °C @ 0.45 MPa 94 °C @ 1.8 MPa	105	^[63]
Siraya Tech	Fibreheart ABS HT HF	ABS	101 °C @ 0.45 MPa 99 °C @ 1.8 MPa	103	^[64]
Sunlu	PLA	PLA	55 °C @ 0.45 MPa	54	^{[65, 66]}
Sunlu	PLA+	PLA	56 °C @ 0.45 MPa	54	^{[66, 67]}
Sunlu	PLA+ 2.0	PLA	56 °C @ 0.45 MPa	54	^{[66, 68]}
Sunlu	High Speed PLA	PLA	57 °C @ 0.45 MPa	54	^{[66, 69]}
Sunlu	PLA Matte	PLA	55 °C @ 0.45 MPa	54	^{[66, 70]}
Sunlu	Silk PLA+	PLA	57 °C @ 0.45 MPa	54	^{[66, 71]}
Sunlu	PETG	PETG	70 °C @ 0.45 MPa	not published	^{[66, 72]}
Sunlu	ABS	ABS	95 °C @ 0.45 MPa	86	^{[66, 73]}
Sunlu	ASA	ASA	101 °C @ 0.45 MPa	105	^{[66, 74]}
Sunlu	PC	PC	101 °C @ 0.45 MPa	not published	^{[66, 75]}
Sunlu	Easy PA	PA (nylon)	119 °C @ 0.45 MPa	135	^{[66, 76]}

What HDT and Vicat measure

Heat deflection temperature (HDT) comes from a bending test: a standard bar carries a fixed load while it is heated, and the reported temperature is where it has bent by a set amount. The data sheets in this database almost always name ISO 75 as the method and state the load: 0.45 MPa, 1.8 MPa, or both ^{[1, 2, 3]}.

Vicat softening temperature comes from a different test, in which a loaded needle presses into the specimen. Bambu Lab and Polymaker report it to ISO 306 ^{[1, 2]}. In this database, Vicat values usually land within a few degrees of the 0.45 MPa HDT for the same product, sometimes above and sometimes below.

Neither number is a maximum service temperature. Both are comparisons under fixed laboratory conditions.

Compare at the same load

A heavier load bends the bar sooner, so a 1.8 MPa HDT is never meant to be compared with a 0.45 MPa HDT. Bambu Lab’s PLA Basic, for example, reaches 57 °C at 0.45 MPa and 54 °C at 1.8 MPa ^[1]. The table on this page shows the load next to every value, and the summary splits the two loads into separate columns. Where a maker publishes HDT without stating a load, the value appears without one and is left out of the summary columns.

Some data sheets look odd at first glance. Prusament PLA gives the same 55 °C at both loads ^[3]. Bambu Lab’s PC data sheet lists a higher HDT at 1.8 MPa than at 0.45 MPa; the value is shown as printed, with a note on the brand page, because the two rows may be transposed.

Printed parts are not test bars

Three cautions apply before using any of these values for a real part:

Specimen preparation. Bambu Lab’s PLA Basic sheet states that its test specimens were annealed and dried at 55 °C for 8 hours before testing ^[1], and Polymaker’s PolyMide CoPA specimens were annealed at 80 °C for 6 hours ^[5]. A part straight off the printer has not had that treatment.
Geometry and load. Thin walls, sparse infill and a steady load all lower the temperature at which a part creeps or sags. HDT says nothing about a bracket holding weight for weeks in a hot car.
The makers’ own caveats. Polymaker says its typical values are for reference and comparison, not for design specifications or quality control ^[2], and Prusa Polymers says its results depend significantly on print settings and conditions ^[3].

Annealing can raise heat resistance

Several makers publish annealing guidance for printed parts. Bambu Lab suggests annealing PLA Basic parts at 50–60 °C for 6–12 hours, warns that parts may deform or warp, and specifies a forced-air oven rather than a kitchen or microwave oven ^[1]. Polymaker recommends annealing PolyMide CoPA parts at 80 °C for 6 hours ^[5]. The data sheets do not all publish an HDT after annealing, so this database records only the HDT values as printed.

The ladder, roughly

From the values in the database, at 0.45 MPa:

PLA: 50–61 °C. Matte, silk and “tough” variants move a few degrees either way.
PETG: 64–73 °C. See PLA vs PETG.
ABS and ASA: 73–101 °C for ABS and 88–103 °C for ASA, depending on brand. See ABS vs ASA.
PC: 101–114 °C. See polycarbonate.
Nylons and fiber-filled engineering grades: the widest spread, because fillers and copolymers vary a lot; the carbon-fiber nylons reach the top of the table. Check the specific product, and see nylon and carbon-fiber filaments.

The summary at the top of the page keeps filled grades (such as PA-CF or PETG-CF) separate from the unfilled material, so a fiber-filled product does not stretch the range of its base plastic.

Print temperature does not predict heat resistance: a filament printed hotter does not automatically hold its shape at a higher temperature. For printing temperatures, use the temperature chart.

Questions

Can a PLA part survive 60 °C if its HDT is 60 °C?

Do not count on it. HDT is measured on a standard bar under a defined load, and makers say their values are for reference and comparison, not design specifications ^{[2, 3]}. Prusa's PLA guide says PLA gets soft and deforms above about 60 °C ^[4].

Why is the 1.8 MPa value lower?

The heavier load bends the bar sooner, so the same plastic reaches the deflection limit at a lower temperature. Bambu Lab's PLA Basic sheet, for example, gives 57 °C at 0.45 MPa and 54 °C at 1.8 MPa ^[1].

Sources

Bambu PLA Basic Technical Data Sheet (V3.0). Bambu Lab. Technical data sheet. HDT ISO 75 at 0.45 and 1.8 MPa; Vicat ISO 306; specimens annealed and dried at 55 °C for 8 h; annealing guidance. Accessed October 12, 2026.
PolyLite PLA Technical Data Sheet (V5.4). Polymaker. Technical data sheet. HDT ISO 75; Vicat ISO 306; specimen printing conditions; values typical, not for design. Accessed October 12, 2026.
Prusament PLA Technical Datasheet (v1.1, 27-07-2022). Prusa Polymers. Technical data sheet. HDT 55 °C at both loads (ISO 75); disclaimer on print-setting dependence. Accessed October 12, 2026.
PLA. Prusa Knowledge Base. Manufacturer documentation. PLA softens and deforms above about 60 °C. Accessed October 12, 2026.
PolyMide CoPA Technical Data Sheet (V5.4). Polymaker. Technical data sheet. Specimens annealed at 80 °C for 6 h; recommended annealing of printed parts. Accessed October 12, 2026.
Bambu High Flow Hotend (H2/P2S/X2D) product page. Bambu Lab. Product page. Max volumetric speed table for PLA Basic, PLA Matte and PETG HF with standard-flow and high-flow 0.4/0.6/0.8 mm hotends. Accessed October 12, 2026.
Bambu PLA Matte Technical Data Sheet (V3.0). Bambu Lab. Technical data sheet. Recommended printing settings, drying, physical, thermal and mechanical properties. Accessed October 12, 2026.
Bambu PLA Silk+ Technical Data Sheet (V1.0). Bambu Lab. Technical data sheet. Recommended printing settings, drying, physical, thermal and mechanical properties. Accessed October 12, 2026.
Bambu PLA Tough+ Technical Data Sheet (V3.0). Bambu Lab. Technical data sheet. Recommended printing settings, drying, physical, thermal and mechanical properties. Accessed October 12, 2026.
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Fibreheart PET-GF TDS. Siraya Tech. Technical data sheet. Print settings, drying, unannealed and annealed property data, annealing procedure. Accessed October 12, 2026.
Siraya Tech Fibreheart PPA TDS. Siraya Tech. Technical data sheet. Print settings, drying, dry and wet HDT, property data. Accessed October 12, 2026.
Siraya Tech Fibreheart PPA-CF TDS. Siraya Tech. Technical data sheet. Print settings, drying, unannealed and annealed property data, max extrusion volumetric speed. Accessed October 12, 2026.
Siraya Tech Fibreheart PPA-CF Core TDS. Siraya Tech. Technical data sheet. Print settings, drying, unannealed and annealed property data. Accessed October 12, 2026.
Siraya Tech Fibreheart ABS-CF TDS. Siraya Tech. Technical data sheet. Print settings, chamber temperature, drying, property data. Accessed October 12, 2026.
Fibreheart ABS-GF Filament TDS. Siraya Tech. Technical data sheet. Print settings, drying, property data. Accessed October 12, 2026.
Siraya Tech Fibreheart ASA-GF TDS. Siraya Tech. Technical data sheet. Print settings, chamber temperature, drying, property data. Accessed October 12, 2026.
Fibreheart ABS HT HF Filament TDS. Siraya Tech. Technical data sheet. Print settings, chamber temperature, drying, property data. Accessed October 12, 2026.
SUNLU PLA Technical Data Sheet (SL-TE-WI-077, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
Material Performance Comparison. SUNLU Wiki. Manufacturer documentation. Detailed specification table for the SUNLU line, including drying temperature and drying time per product. Accessed October 12, 2026.
SUNLU PLA+ Technical Data Sheet (SL-TE-WI-080, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU PLA+2.0 Technical Data Sheet (SL-TE-WI-081, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU High Speed PLA Technical Data Sheet (SL-TE-WI-064, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU PLA Matte Technical Data Sheet (SL-TE-WI-084, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU Silk PLA+ Technical Data Sheet (SL-TE-WI-067, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU PETG Technical Data Sheet (SL-TE-WI-074, version A/1, Chinese/English). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU ABS Technical Data Sheet (SL-TE-WI-068, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU ASA Technical Data Sheet (SL-TE-WI-059, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU PC Technical Data Sheet (SL-TE-WI-126, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.
SUNLU Easy PA Technical Data Sheet (SL-TE-WI-060, version A/1). SUNLU. Technical data sheet. Recommended printing parameters with drying temperature; ISO 75 HDT at 0.45 MPa, ISO 306 Vicat, ISO 1183 density and ISO 527-2 X-Y tensile results from printed specimens. Accessed October 12, 2026.