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Typical Magnetic Performance Guide

C-Cores & Uncased Toroids
Material Description Material Type Letter Thickness (Inches) typical Space Factor min Watts/lb max VA/lb max Test B (kG) Test Freq (Hz) Gap VA per inch2
@ .001” max
3% Silicon Steel
Silectron®1
A .001” .83 12.0 20.3 12.5 400 16.3
A&B .002” .89 10.0 15.0 15.0 400 29.2
A .004” .90 10.0 13.1 15.0 400 29.9
B&C .004” .90 15.0 39.5 17.6 400 41.1
B .007” .92 15.0 39.5 17.6 400 43.0
A .009” .95 0.89 1.7 15.0 60 5.0
B .009” .95 0.89 1.5 17.6 60 6.9
T .011” .95 0.89 1.7 15.0 60 5.0
B .011” .95 0.89 1.5 17.6 60 6.9
A .012” .95 0.89 1.7 15.0 60 5.0
80% Nickel-Iron
Supermalloy®2
D .0005” .65 12.0 18.0 5.0 10,000 57.7
D .001” .83 14.0 21.0 5.0 10,000 70.6
D .002” .89 20.0 30.0 5.0 10,000 81.2
D .004” .90 15.0 22.0 5.0 5000 41.5
50% Nickel-Iron
Deltamax®3
G .0005” .65 30.0 40.0 10.0 5000 115.3
G .001” .83 37.0 47.0 10.0 5000 141.2
G .002” .89 55.0 70.0 10.0 5000 162.4
G .004” .90 3.5 6.0 10.0 400 13.0
50% Cobalt-Iron
Supermendur®4
J .002” .89 20.0 72.0 20.0 400 52.0
J .004” .90 19.0 66.0 21.0 400 58.6
Metglas®5 2605SA1 L .001” .82 16.5 N/A 2.0 20,000  
Nanocrystalline Prime M .0007” & .0005" .78 5.5 N/A 2.0 20,000
Nanocrystalline FT3-W MB .0007” .78 5.5 N/A 2.0 20,000
B (kG) is flux density in kilogauss. Watts/lb & VA/lb are power loss and excitation VA when measured at the indicated flux (B) and frequency (Hz) under sine wave excitation. Gap VA for a 0.001” total air gap was calculated using the following formula: Gap VA = 4.1 × 10-4 × B² × frequency (Hz) × SF² × Ag.

Cores under 25lbs use 0.001” air gap and those in excess of 25lbs use 0.002” air gap. Total core watts = material watts/lb × core wgt in lbs. Total core
excitation VA = material VA/lb × core wgt in lbs + gap VA. Note: Odd or small core geometry may impact performance.
E-Cores
3% Silicon Steel
Silectron®1
A .004” .90 12.0 22.7 15.0 400 51.8
B&C .004” .90 18.0 68.4 17.6 400 71.0
B .007” .92 18.0 68.4 17.6 400 74.0
B .009” .95 1.1 4.0 17.6 60 11.9
A .012” .95 1.1 2.9 15.0 60 8.7
T .011” .95 1.1 2.9 15.0 60 8.7
B .011” .95 1.1 4.0 17.6 60 11.9
50% Cobalt-Iron Supermendur®4 J .004” .90 22.0 120.0 21.0 400 101.0
Total 3-phase core excitation VA = material VA/lb × core wgt in lbs + gap VA. VA for a total air gap of 0.0015” was calculated with the following formula: Gap VA = 6.15 × 10-4 × B² x frequency (Hz) × SF² × Ag. E-cores under 25 lbs use 0.0015” total air gap, E-cores over 25lbs use total air gap of 0.003”.
Note: Odd or small core geometry may impact performance.
1. Silectron® is a registered trademark of Allegheny Ludlum Steel Corp.
2. Supermalloy® is the discontinued product name of Western Electric Co.
3. Deltamax® is the discontinued product name of Alleghney Ludlum Steel Corp.
4. Supermendur® is the discontinued product name of Carpenter Technology.
5. Metglas® is a registered trademark of Metglas, Inc.
6. Finemet® is a registered trademark of Hitachi Metals Corp.
7. Vitroperm® is a registered trademark of Vacuumschmelze GmbH.
  • MK Magnetics will gladly test cores to your specific needs
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