NTC Ceramic PWR
Grade
PWR = mn-Ni-Cu-Fe low-resistivity power grade
Pick large-diameter discs for inrush-current limiting: low resistivity and high heat capacity let the element survive repeated energisation and self-heating up to 200 °C.
Values for the PWR condition
Other NTC Ceramic tempers and conditions
NTC Ceramic is listed in 4 conditions; see the grade overview at NTC Ceramic.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWRThis page Mn-Ni-Cu-Fe low-resistivity power grade | Pick large-diameter discs for inrush-current limiting: low resistivity and high heat capacity let the element survive repeated energisation and self-heating up to 200 °C. | — | 50 | 0 | 640 HV | 4 W/m·K |
MNCDefault Mn-Ni-Co spinel, standard sensing grade | Default for temperature measurement and compensation chips or discs: medium room-temperature resistivity, B25/85 of 3400–4000 K and tight unit-to-unit consistency up to 150 °C. | — | 60 | 0 | 700 HV | 4 W/m·K |
Fine-grain bead body for glass-encapsulated precision thermistors | Choose the fine-grain, high-density bead body for glass-encapsulated probes needing ±0.1 °C-class accuracy and the best long-term stability, such as medical sensors, to 300 °C. | — | 70 | 0 | 760 HV | 5 W/m·K |
High-temperature NTC | Use for exhaust-gas and heater measuring points: the spinel-plus-perovskite (Y-Cr-Mn oxide) body has high resistivity and ageing resistance and runs continuously at 500–1000 °C. | — | — | — | 800 HV | 4 W/m·K |
What is NTC Ceramic PWR?
NTC Ceramic PWR is NTC Ceramic in the PWR grade — pick large-diameter discs for inrush-current limiting: low resistivity and high heat capacity let the element survive repeated energisation and self-heating up to 200 °C. NTC Ceramic PWR has a tensile strength of 50 MPa (7.25 ksi), weaker than 67% of ceramic grades. Elongation at break is 0% and the elastic modulus is 120 GPa (17.4 Msi). NTC Ceramic PWR has a density of 5 g/cm³ (0.181 lb/in³), heavier than 51% of ceramic grades. It melts at 1,500°C (2,732 °F). MNC is the default condition FabDigit quotes; PWR is available on request or by drawing note.
Limitations
- Limited service temperature — 200°C (392 °F), worse than 84% of ceramic grades
- Hard to polish — 60/100, worse than 79% of ceramic grades
NTC Ceramic PWR properties
Typical room-temperature values for NTC Ceramic PWR; 17 are specific to this condition. Other listed values are NTC Ceramic reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical3
NTC Ceramic PWR has a density of 5 g/cm³ (0.181 lb/in³), heavier than 51% of ceramic grades. It melts at 1,500°C (2,732 °F).
Mechanical12
NTC Ceramic PWR has a tensile strength of 50 MPa (7.25 ksi), weaker than 67% of ceramic grades. Elongation at break is 0% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal5
NTC Ceramic PWR is rated for continuous service to 200°C (392 °F). It conducts heat at 3.5 W/m·K (2.02 BTU/hr·ft·°F), worse than 74% of ceramic grades. Thermal expansion is 8.5 µm/m·K (4.72 µin/in·°F).
Electrical2
NTC Ceramic PWR has an electrical resistivity of 3 Ω·m.
Chemical & Environmental2
Corrosion resistance is good (65/100), worse than 67% of ceramic grades.
Sustainability4
Producing a kilogram of NTC Ceramic PWR takes about 90 MJ of energy and emits 7.5 kg of CO₂ — less than 62% of ceramic grades. Typical recycled content is 0%.
Manufacturability3
NTC Ceramic PWR's machinability is not recommended (5/100, worse than 59% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with NTC Ceramic PWR
Is NTC Ceramic easy to machine?
After sintering, only diamond grinding, ultrasonic machining or laser scribing are possible. Forming in the green state by dry pressing, tape casting and punching is the most economical route.
Can NTC Ceramic be welded?
The ceramic body cannot be welded. Electrodes are fired-on Ag or Ag-Pd paste or sputtered Ni-Cu, with leads attached by soldering or welding, or by a glass-sealed joint.
Can NTC Ceramic be formed, bent or molded?
Oxide powders are blended, ball milled, calcined, granulated and then dry pressed or tape cast, followed by air sintering at 1150-1350 C. The cooling rate governs cation distribution and therefore the B value.
What surface finishes work on NTC Ceramic?
Grind the end faces to hold thickness tolerance, screen print Ag electrodes and fire them at 700-850 C, then epoxy coat or glass encapsulate and burn in to stabilise resistance.
NTC Ceramic chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Mnadded as Mn3O4/MnCO3; main spinel B-site constituent | 25 – 45 | 36 |
| Nias NiO; adjusts B value and resistivity | 5 – 20 | 12 |
| Coas Co3O4; lowers resistivity, improves stability | 3 – 20 | 11 |
| Cuadded in power-type/low-resistance formulas | 0 – 8 | 0 |
| Fepower-type formulas and improved aging behavior | 0 – 8 | 0 |
| Alstabilizes the spinel phase in high-temperature types | 0 – 3 | 0 |
| Ooxygen site of the spinel (AB2O4) lattice | balance | — |
NTC Ceramic PWR — frequently asked
What is NTC Ceramic PWR used for?
NTC Ceramic PWR is typically used for temperature sensors, inrush current limiters and battery pack thermal monitoring. In short: steep negative temperature coefficient; sensing and inrush limiting; green-formed net shapes.
What is the tensile strength of NTC Ceramic PWR?
NTC Ceramic PWR has a typical tensile strength of 50 MPa (7.25 ksi) — weaker than 67% of ceramic grades. Strength varies by condition: see the 4 listed tempers.
Is NTC Ceramic PWR easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 59% of ceramic grades). After sintering, only diamond grinding, ultrasonic machining or laser scribing are possible. Forming in the green state by dry pressing, tape casting and punching is the most economical route.
Can NTC Ceramic PWR be welded?
The ceramic body cannot be welded. Electrodes are fired-on Ag or Ag-Pd paste or sputtered Ni-Cu, with leads attached by soldering or welding, or by a glass-sealed joint.
What surface finishes work on NTC Ceramic PWR?
Grind the end faces to hold thickness tolerance, screen print Ag electrodes and fire them at 700-850 C, then epoxy coat or glass encapsulate and burn in to stabilise resistance.
Can NTC Ceramic PWR be formed, bent or molded?
Oxide powders are blended, ball milled, calcined, granulated and then dry pressed or tape cast, followed by air sintering at 1150-1350 C. The cooling rate governs cation distribution and therefore the B value.
What is the maximum service temperature of NTC Ceramic PWR?
NTC Ceramic PWR is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- IEC 60539-1 Directly heated negative temperature coefficient thermistors — IEC (2016)
- ASM Engineered Materials Handbook Vol.4: Ceramics and Glasses — ASM International (1991)
- NTC Thermistors — General Technical Information — TDK/EPCOS (2023)
- NTC Thermistor Application Notes — Vishay / Murata (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.