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TOYO TANSO Graphite Grades — Selection Guide

Expo Advanced Materials is an authorised machining partner of TOYO TANSO CO., LTD., Japan. We machine all major TOYO TANSO isostatic graphite grades — with full material traceability on every order.

Authorised TOYO TANSO Machining Partner

TOYO TANSO CO., LTD. (Japan) is the world's leading manufacturer of isostatic graphite. Expo Advanced Materials machines TOYO TANSO grades to customer drawings with full raw-material certificate and MTC on every shipment. We supply to vacuum furnace OEMs, semiconductor fabs, and solar manufacturers in 16+ countries.

Grade Properties

Data from TOYO TANSO published datasheets. Typical values — not guaranteed minimums unless specified on order.

Grade Density (g/cm³) Flexural Str. (MPa) Grain Size (µm) Resistivity (µΩ·m) Ash (ppm) Primary Application
TTK-8 1.80 49 20 13 <100 Vacuum furnace heating elements, furnace fixtures
TTK-87 1.82 55 10 12 <50 High-purity heating elements, semiconductor
IG-110 1.77 38 20 11 <10 Nuclear-grade; CZ crystal growth, high-purity sintering
IG-430U 1.82 55 10 11 <5 Semiconductor — ultra-high purity CVD/CVI and CZ
IG-15 1.80 42 20 13 <100 General purpose machined components, EDM
ISO-88 1.82 55 <20 12 <100 EDM electrodes, semiconductor, solar ingot growth
ISO-63 1.86 70 <10 11 <100 Sintering dies, high-load furnace structural parts
ETP-10 1.75 35 500 11 <100 Extruded grade — rods, tubes, electrode applications

Grade Details

TTK-8 Standard Isostatic Graphite

The workhorse grade for vacuum furnace components. TTK-8 offers a well-balanced combination of density, flexural strength and electrical resistivity, making it suitable for heating elements, fixtures, trays and structural hot zone parts.

Typical applications
  • Vacuum furnace heating elements
  • Sintering fixtures and trays
  • Graphite fasteners and threaded parts
  • Continuous casting dies
  • Sealing rings and bushings
TTK-87 High-Purity Isostatic Graphite

Higher purity variant of TTK-8. Ash content below 50 ppm makes TTK-87 suitable for applications where metallic contamination from the heating element must be minimised — precision sintering, compound semiconductor processing and high-purity brazing.

Typical applications
  • High-purity vacuum furnace heating elements
  • Compound semiconductor sintering
  • Precision brazing fixtures
  • PVD coating chamber components
IG-110 Nuclear-Grade Ultra-High Purity

IG-110 is TOYO TANSO's nuclear-qualified isostatic graphite grade, produced under strict purity controls. Ash content below 10 ppm and excellent radiation resistance. Widely used in high-temperature gas-cooled reactor cores and high-purity crystal growth systems.

Typical applications
  • Czochralski silicon crystal growth
  • High-purity float zone processing
  • Research and nuclear applications
  • Any process requiring <10 ppm ash
IG-430U Semiconductor Ultra-High Purity

Ultra-fine grain, ultra-high purity graphite for the most demanding semiconductor applications. Ash content below 5 ppm. Used in advanced CVD reactors, III-V compound semiconductor growth and precision CZ systems.

Typical applications
  • Advanced semiconductor CVD/CVI reactors
  • III-V compound crystal growth
  • Precision CZ and FZ pulling systems
  • Any process requiring <5 ppm ash
ISO-88 / ISO-63 Premium Isostatic Graphite (machined blocks)

ISO-88 (fine grain, density ≥1.82) and ISO-63 (high density ≥1.86, fine grain <10µm) are premium grades suitable for EDM electrodes, sintering tooling and high-load furnace fixtures. ISO-63 is preferred where maximum mechanical strength is required.

Typical applications
  • EDM graphite electrodes (ISO-88)
  • Sintering dies and hot press tooling (ISO-63)
  • Structural vacuum furnace components
  • High-load graphite fixtures

How to specify your grade

Not sure which grade to specify? Send us your application details and we will recommend the right TOYO TANSO grade. Key parameters to share:

Operating temperature (°C)
Atmosphere (vacuum, inert gas, H₂)
Purity requirement (ppm ash)
Component dimensions and geometry
Mechanical load or stress requirements
Quantity and delivery schedule
Request grade recommendation → Vacuum furnace components

Need a specific TOYO TANSO grade machined?

Send your drawing and grade requirement — quote within 24 hours with full material traceability.

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