Material 43
also 43
Material 43 is a general-purpose Ni-Zn ferrite grade effective from roughly 25 to 300 MHz and is one of the most widely used EMI-suppression bead and clamp materials in the industry.
Reference datasheet — Material 43 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SINT condition
Material 43 tempers and conditions
Material 43 is supplied in 2 conditions, soft to hard. SINT is the default FabDigit quotes; the values on this page are for it.
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 | ||
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 |
Supply forms, finishes and certifications
Ways Material 43 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
EXT | Extruded tube/sleeve stock, sintered | Supply form |
What is Material 43?
Material 43 is a general-purpose Ni-Zn ferrite grade effective from roughly 25 to 300 MHz and is one of the most widely used EMI-suppression bead and clamp materials in the industry. It is supplied sintered, extruded or in 44HR condition as beads, sleeves, split clamp halves and toroids, with a density of 4.75 g/cm3. Maximum service temperature is 125 C, lower than Material 61, and the fired ceramic is brittle with a machinability score of 8. Choose Material 61 when suppression is needed below about 25 MHz or when a 200 C rating is required. Material 43 has a density of 4.75 g/cm³ (0.172 lb/in³), lighter than 54% of ceramic grades. It melts at 1,550°C (2,822 °F). Material 43 has a tensile strength of 30 MPa (4.35 ksi), weaker than 77% of ceramic grades. The elastic modulus is 130 GPa (18.9 Msi).
What is Material 43 used for?
- EMI suppression clamps/beads
- cable ferrites
- broadband chokes
Advantages
- Low embodied carbon — 4.5 kg CO₂/kg, better than 78% of ceramic grades
Limitations
- Limited service temperature — 125°C (257 °F), worse than 94% 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 properties
Typical room-temperature values for Material 43-SINT; bars are the position among ceramic grades.
Physical3
Material 43 has a density of 4.75 g/cm³ (0.172 lb/in³), lighter than 54% of ceramic grades. It melts at 1,550°C (2,822 °F).
Mechanical11
Material 43 has a tensile strength of 30 MPa (4.35 ksi), weaker than 77% of ceramic grades. The elastic modulus is 130 GPa (18.9 Msi).
Thermal5
Material 43 is rated for continuous service to 125°C (257 °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 9 µm/m·K (5 µin/in·°F).
Electrical3
Material 43 has an electrical resistivity of 1,000 Ω·m.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 77% of ceramic grades.
Sustainability4
Producing a kilogram of Material 43 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's machinability is not recommended (8/100, better than 69% of ceramic grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the ceramic family
Yield strength against density for every ceramic grade FabDigit runs. Material 43 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Material 43
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.
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) |
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.
Equivalent designations
Standards and trade names that resolve to Material 43 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- 43
How much does Material 43 cost?
Material 43 is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Material 43 — frequently asked
What is Material 43 used for?
Material 43 is typically used for EMI suppression clamps/beads, cable ferrites and broadband chokes. In short: high-volume suppression ferrite; 25-300 MHz range; lower temperature rating than 61.
What is the tensile strength of Material 43?
Material 43 has a typical tensile strength of 30 MPa (4.35 ksi) — weaker than 77% of ceramic grades. Strength varies by condition: see the 2 listed tempers.
Is Material 43 easy to machine?
Not especially — machinability is rated not recommended (8/100, better than 69% of ceramic grades). Sintered ferrite is hard and brittle — only diamond wheel grinding, slicing or lapping; never drill or turn with carbide.
Can Material 43 be welded?
Not weldable; join by adhesive bonding (epoxy/cyanoacrylate) or by clamping in plastic snap housings.
What surface finishes work on Material 43?
Deburr/tumble as-fired surfaces, then parylene, epoxy or nylon coating for insulation and chip resistance; edges should be chamfered to avoid wire insulation cuts.
Can Material 43 be formed, bent or molded?
Net-shape by dry uniaxial pressing or extrusion of granulated oxide powder, then air sintering near 1200–1300 °C with ~15–20 % linear shrinkage.
What is the maximum service temperature of Material 43?
Material 43 is rated for continuous use to about 125°C (257 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Material 43 cost?
Material 43 is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.