Material 43 44HR
Grade
also 43
44HR = high-resistivity / higher-Curie 43-class NiZn
Choose when the bead sits on bare conductors or in hot enclosures: same ~800 permeability but ~1000× higher DC resistivity and Curie point near 150 °C.
Values for the 44HR condition
Other Material 43 tempers and conditions
Material 43 is listed in 2 conditions; see the grade overview at Material 43.
- SINT
- 44HR
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SINTDefault Sintered | Default route for toroids, beads, snap-on clamp halves and shield beads; highest density and flexural strength of the 43 family. | — | 30 | — | 600 HV | 5 W/m·K |
44HRThis page High-resistivity / higher-Curie 43-class NiZn | Choose when the bead sits on bare conductors or in hot enclosures: same ~800 permeability but ~1000× higher DC resistivity and Curie point near 150 °C. | — | 32 | 0.03 | 620 HV | 5 W/m·K |
What is Material 43 44HR?
Material 43 44HR is Material 43 in the 44HR grade — choose when the bead sits on bare conductors or in hot enclosures: same ~800 permeability but ~1000× higher DC resistivity and Curie point near 150 °C. Material 43 44HR has a tensile strength of 32 MPa (4.64 ksi), weaker than 72% of ceramic grades. The elastic modulus is 135 GPa (19.6 Msi). Material 43 44HR has a density of 4.85 g/cm³ (0.175 lb/in³), heavier than 50% of ceramic grades. It melts at 1,550°C (2,822 °F). SINT is the default condition FabDigit quotes; 44HR is available on request or by drawing note.
Advantages
- Low embodied carbon — 4.5 kg CO₂/kg, better than 78% of ceramic grades
Limitations
- Limited service temperature — 145°C (293 °F), worse than 92% of ceramic grades
- Hard to polish — 60/100, worse than 79% of ceramic grades
- Needs corrosion protection — 55/100, worse than 77% of ceramic grades
Material 43 44HR properties
Typical room-temperature values for Material 43 44HR; 15 are specific to this condition. Other listed values are Material 43 reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical3
Material 43 44HR has a density of 4.85 g/cm³ (0.175 lb/in³), heavier than 50% of ceramic grades. It melts at 1,550°C (2,822 °F).
Mechanical11
Material 43 44HR has a tensile strength of 32 MPa (4.64 ksi), weaker than 72% of ceramic grades. The elastic modulus is 135 GPa (19.6 Msi).
Thermal5
Material 43 44HR is rated for continuous service to 145°C (293 °F). It conducts heat at 4.7 W/m·K (2.72 BTU/hr·ft·°F), worse than 62% of ceramic grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical3
Material 43 44HR has an electrical resistivity of 1,000,000 Ω·m.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 77% of ceramic grades.
Sustainability4
Producing a kilogram of Material 43 44HR takes about 40 MJ of energy and emits 4.5 kg of CO₂ — less than 88% of ceramic grades. Typical recycled content is 10%.
Manufacturability3
Material 43 44HR's machinability is not recommended (8/100, better than 69% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Material 43 44HR
Is Material 43 easy to machine?
Sintered ferrite is hard and brittle — only diamond wheel grinding, slicing or lapping; never drill or turn with carbide.
Can Material 43 be welded?
Not weldable; join by adhesive bonding (epoxy/cyanoacrylate) or by clamping in plastic snap housings.
Can Material 43 be formed, bent or molded?
Net-shape by dry uniaxial pressing or extrusion of granulated oxide powder, then air sintering near 1200–1300 °C with ~15–20 % linear shrinkage.
What surface finishes work on Material 43?
Deburr/tumble as-fired surfaces, then parylene, epoxy or nylon coating for insulation and chip resistance; edges should be chamfered to avoid wire insulation cuts.
Material 43 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 |
|---|---|---|
| ZnOsets permeability/Curie balance | 12 – 22 | 18 |
| NiOgives high resistivity and MHz loss | 8 – 16 | 12 |
| CuOsintering aid in some 43-class formulations | 0 – 4 | 1.5 |
| CoO + SiO2 + CaO (dopants)grain-boundary and loss-tuning additives | 0 – 1 | 0.3 |
| Fe2O3≈48–50 mol% Fe2O3 spinel base | ≥ 62 (balance) | — |
Material 43 44HR — frequently asked
What is Material 43 44HR used for?
Material 43 44HR is typically used for EMI suppression clamps/beads, cable ferrites and broadband chokes. In short: high-volume suppression ferrite; 25-300 MHz range; lower temperature rating than 61.
What is the tensile strength of Material 43 44HR?
Material 43 44HR has a typical tensile strength of 32 MPa (4.64 ksi) — weaker than 72% of ceramic grades. Strength varies by condition: see the 2 listed tempers.
Is Material 43 44HR easy to machine?
Not especially — machinability is rated not recommended (8/100, better than 69% of ceramic grades). Sintered ferrite is hard and brittle — only diamond wheel grinding, slicing or lapping; never drill or turn with carbide.
Can Material 43 44HR be welded?
Not weldable; join by adhesive bonding (epoxy/cyanoacrylate) or by clamping in plastic snap housings.
What surface finishes work on Material 43 44HR?
Deburr/tumble as-fired surfaces, then parylene, epoxy or nylon coating for insulation and chip resistance; edges should be chamfered to avoid wire insulation cuts.
Can Material 43 44HR be formed, bent or molded?
Net-shape by dry uniaxial pressing or extrusion of granulated oxide powder, then air sintering near 1200–1300 °C with ~15–20 % linear shrinkage.
What is the maximum service temperature of Material 43 44HR?
Material 43 44HR is rated for continuous use to about 145°C (293 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- 43 Material Data Sheet (NiZn EMI suppression ferrite) — Fair-Rite Products Corp. (2023)
- Soft Ferrite Materials and Core Catalog (NiZn series) — DMEGC / (2023)
- ASM Engineered Materials Handbook Vol.4 — Ceramics and Glasses — ASM International (1991)
- Soft Ferrites: Properties and Applications — Butterworth-Heinemann (Snelling) (1988)
- IEC 60401 / GB/T 9633 soft ferrite terminology and measurement (2018)
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.