NTC Ceramic BEAD
Finish state
BEAD = 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.
Values for the BEAD 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 |
|---|---|---|---|---|---|---|
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 |
BEADThis page 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 BEAD?
NTC Ceramic BEAD is NTC Ceramic supplied in the BEAD condition — 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. NTC Ceramic BEAD has a tensile strength of 70 MPa (10.2 ksi), weaker than 60% of ceramic grades. Elongation at break is 0% and the elastic modulus is 145 GPa (21 Msi). NTC Ceramic BEAD has a density of 5.2 g/cm³ (0.188 lb/in³), heavier than 54% of ceramic grades. It melts at 1,500°C (2,732 °F). MNC is the default condition FabDigit quotes; BEAD is available on request or by drawing note.
Limitations
- Limited service temperature — 300°C (572 °F), worse than 82% of ceramic grades
- Hard to polish — 60/100, worse than 79% of ceramic grades
NTC Ceramic BEAD properties
Typical room-temperature values for NTC Ceramic BEAD; 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 BEAD has a density of 5.2 g/cm³ (0.188 lb/in³), heavier than 54% of ceramic grades. It melts at 1,500°C (2,732 °F).
Mechanical12
NTC Ceramic BEAD has a tensile strength of 70 MPa (10.2 ksi), weaker than 60% of ceramic grades. Elongation at break is 0% and the elastic modulus is 145 GPa (21 Msi).
Thermal5
NTC Ceramic BEAD is rated for continuous service to 300°C (572 °F). It conducts heat at 4.5 W/m·K (2.6 BTU/hr·ft·°F), worse than 64% of ceramic grades. Thermal expansion is 8.5 µm/m·K (4.72 µin/in·°F).
Electrical2
NTC Ceramic BEAD has an electrical resistivity of 500 Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (75/100), better than 50% of ceramic grades.
Sustainability4
Producing a kilogram of NTC Ceramic BEAD 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 BEAD's machinability is not recommended (4/100, worse than 85% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with NTC Ceramic BEAD
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 BEAD — frequently asked
What is NTC Ceramic BEAD used for?
NTC Ceramic BEAD 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 BEAD?
NTC Ceramic BEAD has a typical tensile strength of 70 MPa (10.2 ksi) — weaker than 60% of ceramic grades. Strength varies by condition: see the 4 listed tempers.
Is NTC Ceramic BEAD easy to machine?
Not especially — machinability is rated not recommended (4/100, worse than 85% 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 BEAD 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 BEAD?
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 BEAD 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 BEAD?
NTC Ceramic BEAD is rated for continuous use to about 300°C (572 °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.