Solar / PV
Graphite components for polysilicon production, ingot casting and wafer slicing.
<50 ppm
Ash content (solar grade)
1600°C
DS furnace temp
TTK-8
Preferred grade
Graphite solutions for Solar / PV
Polysilicon production, Czochralski ingot pulling, and directional solidification (DS) casting all rely on graphite as the primary structural and thermal management material inside the hot zone. Graphite's ability to withstand silicon's 1414°C melting point while remaining chemically inert makes it irreplaceable in photovoltaic manufacturing.
Expo supplies DS blocks, crucible holders, insulation packages, susceptors, and coating fixture components to solar cell manufacturers across India, Southeast Asia, and Europe — from premium TOYO TANSO grades with full purity certification.
Why Expo for Solar / PV
TOYO TANSO authorised partner — premium solar-grade graphite
Purity certificates with every lot — ash <50 ppm standard
Experienced with DS and CZ furnace configurations
Custom DS block machining to drawing with ±0.05 mm tolerance
Where we supply
Key applications in Solar / PV
DS / mc-Si Ingot Casting
Directional solidification blocks, crucible holders, and insulation packages for multi-crystalline silicon casting furnaces.
CZ Mono-Si Pulling
Crucibles, susceptors, heaters, and puller assemblies for Czochralski mono-crystalline ingot production.
Siemens Reactor
High-purity graphite components and seed rod holders for the Siemens chemical vapour deposition polysilicon process.
Silicon Nitride Coating
Precision graphite jigs and fixtures used in silicon nitride anti-reflection coating processes.
Wire Sawing
Graphite beam and guide components for multi-wire saw ingot slicing operations.
Crucible Recycling
Graphite crucible refurbishment and re-machining service to extend component service life.
Technical reference
Typical specifications
| Application | DS / mc-Si ingot casting; CZ mono-Si pulling |
| Grade (standard solar) | TTK-8 / ISO-88 — ash <50 ppm |
| Grade (high purity) | IG-110 — ash <10 ppm |
| Max service temperature | 1600°C (DS furnace); up to 2000°C (CZ) |
| Density | 1.75–1.85 g/cm³ |
| Customisation | DS block profiles to customer drawing |
| Lead time | 2–5 weeks; stock items available |
| HS Code | 6903.10 (crucibles) / 6815.10 (other components) |
Material grades
Recommended graphite grades
Grades we supply for this application
TTK-8
Standard solar-grade isostatic — ash <50 ppm, thermal shock resistant
ISO-88
Cost-effective isostatic for DS furnace structural components
IG-110
High-purity for CZ silicon and sensitive deposition processes
Need grade guidance?
Our technical team will recommend the right grade for your operating conditions — at no charge.
Ready to source graphite for Solar / PV?
Get a quote in 24 hours — ISO 9001:2015 certified, export worldwide.