Huahao Sealing · Carbon Graphite Components
Isostatic graphite is a high-purity graphite formed by cold isostatic pressing (CIP), featuring high isotropy and uniform structure. Huahao Sealing supplies isostatic graphite blanks and precision-machined parts with purity above 99.99%, density 1.75-1.85 g/cm³ and isotropy below 5%, for semiconductor, photovoltaic, nuclear and high-precision sealing applications.
| Density | 1.75 – 1.85 g/cm³ |
| Purity | > 99.99% carbon |
| Isotropy | < 5% (CTE variation) |
| Temperature | -200°C ~ 500°C (inert atmosphere 2800°C) |
| Compressive Strength | 120 – 200 MPa |
| Shore Hardness | 55 – 75 HS |
| Grain Size | 10 – 20 μm (fine-grain) |
| Ash Content | < 100 ppm |
High purity — carbon content above 99.99%, ash below 100 ppm, meeting semiconductor and photovoltaic purity requirements
Isotropy — isostatic forming ensures uniform properties in all directions, anisotropy below 5%, no deformation during precision machining
Uniform structure — fine-grain structure (10-20 μm), consistent cross-sectional properties for high-precision seals
High machinability — moderate hardness (55-75 HS) allows complex geometries and micron-level tolerances
Ultra-high temperature — up to 2800°C in inert atmosphere, 2000°C in vacuum
Semiconductor manufacturing — crystal growth furnace heaters, crucibles, heat shields
Photovoltaic industry — monocrystalline silicon pulling furnace graphite components
High-temperature vacuum furnaces — heating elements, radiation shields, furnace beds
Nuclear industry — reactor graphite reflectors and moderators
High-precision sealing — EDM-machined seals, precision molds
| Grade Code | Temperature | Notes |
|---|---|---|
| IG-11 | 2800°C | General isostatic graphite, semiconductor grade |
| IG-430 | 2800°C | High-density isostatic graphite, wear-resistant |
Isostatic graphite is formed by CIP (cold isostatic pressing) with uniform pressure from all directions, achieving isotropy below 5% with uniform structure and high purity. Standard molded graphite is unidirectionally pressed, with high anisotropy and significant directional property variation, unsuitable for high-precision and high-purity applications.
Yes. Isostatic graphite has purity above 99.99% and ash below 100 ppm, meeting the semiconductor industry's strict material purity requirements. It is widely used for crystal growth furnace heaters, crucibles and heat shields.
Submit your duty parameters (temperature, pressure, media, speed) — engineers reply with grade selection and quotation within 24 hours.
