N87 SINT-STD
Finish state · default condition
Default choice for power transformers: highest effective permeability, lowest loss, mating faces lapped for minimum residual gap.
Values for the SINT-STD condition
Other N87 tempers and conditions
N87 is listed in 2 conditions; see the grade overview at N87.
- GAP
- SINT-STD
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Centre-leg ground air gap | Pick when DC bias must be handled (flyback / PFC choke): ground gap sets a stable, low-tolerance A_L value. | — | 28 | 0 | 600 HV | 4 W/m·K |
SINT-STDDefaultThis page as-sintered core with ground/lapped mating faces (ungapped) | Default choice for power transformers: highest effective permeability, lowest loss, mating faces lapped for minimum residual gap. | — | 30 | 0 | 600 HV | 4 W/m·K |
What is N87 SINT-STD?
N87 SINT-STD is N87 supplied in the SINT-STD condition — default choice for power transformers: highest effective permeability, lowest loss, mating faces lapped for minimum residual gap. N87 SINT-STD has a tensile strength of 30 MPa (4.35 ksi), weaker than 77% of ceramic grades. Elongation at break is 0% and the elastic modulus is 150 GPa (21.8 Msi). N87 SINT-STD has a density of 4.85 g/cm³ (0.175 lb/in³), heavier than 50% of ceramic grades.
Advantages
- Low embodied carbon — 3.5 kg CO₂/kg, better than 81% of ceramic grades
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
N87 SINT-STD properties
Typical room-temperature values for N87 SINT-STD; 13 are specific to this condition. Other listed values are N87 reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical2
N87 SINT-STD has a density of 4.85 g/cm³ (0.175 lb/in³), heavier than 50% of ceramic grades.
Mechanical11
N87 SINT-STD has a tensile strength of 30 MPa (4.35 ksi), weaker than 77% of ceramic grades. Elongation at break is 0% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal5
N87 SINT-STD is rated for continuous service to 200°C (392 °F). It conducts heat at 4 W/m·K (2.31 BTU/hr·ft·°F), worse than 68% of ceramic grades. Thermal expansion is 10 µm/m·K (5.56 µin/in·°F).
Electrical2
N87 SINT-STD has an electrical resistivity of 10 Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (70/100), worse than 59% of ceramic grades.
Sustainability4
Producing a kilogram of N87 SINT-STD takes about 45 MJ of energy and emits 3.5 kg of CO₂ — less than 84% of ceramic grades. Typical recycled content is 10%.
Manufacturability3
N87 SINT-STD's machinability is not recommended (8/100, better than 69% of ceramic grades).
Common Calculations4
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N87 SINT-STD
Is N87 easy to machine?
Sintered ferrite is only diamond-ground or lapped (wet, low feed); it chips at edges and dust is abrasive — all shaping is done in the green/pressed state.
Can N87 be welded?
Not weldable; core halves are joined by clamps, spring clips or epoxy bonding of the lapped mating faces.
Can N87 be formed, bent or molded?
Made by dry pressing (or extrusion for toroids/rods) of spray-dried MnZn powder then sintering at ~1300–1400 °C under controlled oxygen partial pressure; allow ~15–20 % firing shrinkage.
What surface finishes work on N87?
Mating faces lapped to minimise residual gap; toroids get parylene or epoxy coating for edge protection and winding insulation — no plating or painting is used.
N87 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 |
|---|---|---|
| Fe2O3≈52 mol% Fe2O3 typical for power MnZn | 68 – 74 | 71 |
| MnOas Mn3O4 in the raw mix | 18 – 24 | 21 |
| ZnOsets Curie point / permeability | 6 – 10 | 7.5 |
| CaO + SiO2 + Co3O4 (dopants)grain-boundary resistivity and loss-minimum tuning | 0.05 – 1 | 0.5 |
N87 SINT-STD — frequently asked
What is N87 SINT-STD used for?
N87 SINT-STD is typically used for power transformer cores, choke cores and SMPS designs. In short: multi-supplier power ferrite; 200 °C rated service; low loss for SMPS cores.
What is the tensile strength of N87 SINT-STD?
N87 SINT-STD 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 N87 SINT-STD easy to machine?
Not especially — machinability is rated not recommended (8/100, better than 69% of ceramic grades). Sintered ferrite is only diamond-ground or lapped (wet, low feed); it chips at edges and dust is abrasive — all shaping is done in the green/pressed state.
Can N87 SINT-STD be welded?
Not weldable; core halves are joined by clamps, spring clips or epoxy bonding of the lapped mating faces.
What surface finishes work on N87 SINT-STD?
Mating faces lapped to minimise residual gap; toroids get parylene or epoxy coating for edge protection and winding insulation — no plating or painting is used.
Can N87 SINT-STD be formed, bent or molded?
Made by dry pressing (or extrusion for toroids/rods) of spray-dried MnZn powder then sintering at ~1300–1400 °C under controlled oxygen partial pressure; allow ~15–20 % firing shrinkage.
What is the maximum service temperature of N87 SINT-STD?
N87 SINT-STD 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
- Ferrites and Accessories — Material N87 data sheet — TDK Electronics (EPCOS) (2023)
- Soft Ferrites and Accessories — Data Handbook — Ferroxcube (2013)
- Power ferrite materials DMR95/DMR96 datasheet — DMEGC (2023)
- ASM Engineered Materials Handbook Vol.4 — Ceramics and Glasses (ferrite section) — ASM International (1991)
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.