RFQ Checklist
- Dimensions (OD, ID, Height, Thickness)
- Required foil/coating on surfaces
- Maximum operating temperature
Rigid graphite felt insulation for high-temperature vacuum furnaces and inert-atmosphere hot zones. Designed for low thermal conductivity, shape stability, and controlled outgassing.
| Metric | Typical Range | Why It Matters |
|---|---|---|
| Thermal Conductivity | 0.1 - 0.2 W/m·K at 1000°C | Determines energy efficiency and max temp. |
| Thickness and Density | Specified by hot-zone heat-loss target | Under-specified insulation increases power draw and reduces temperature stability. |
| Surface Treatment | Bare felt, foil-faced, or coated surface | Surface treatment reduces dusting and protects fragile insulation edges. |
| Fit Geometry | Cylinder, ring, plate, or segmented assembly | Gaps between insulation pieces become repeatable heat-loss paths. |
| Decision Factor | Selection Logic | Buyer Check |
|---|---|---|
| Heat-loss target | Select felt thickness and geometry from energy efficiency and thermal-uniformity goals. | Provide hot-zone diameter, height, target temperature, and power limitation. |
| Particle control | Use surface foil or coating when dusting can contaminate the furnace or adjacent graphite parts. | Define clean handling, exposed edges, and expected maintenance access. |
| Segmentation | Large insulation rings often need segments for installation, shipping, and serviceability. | Send chamber access constraints and preferred installation sequence. |
| Stage | Production / QC Checkpoint | Buyer Evidence |
|---|---|---|
| 1. Heat-loss review | Confirm hot-zone dimensions, maximum temperature, target insulation thickness, and gaps. | Chamber layout, insulation drawing, and energy or uniformity target. |
| 2. Felt configuration | Select rigid felt geometry, density, segmentation, and surface treatment. | Configuration drawing with bare, foil-faced, or coated surfaces noted. |
| 3. Machining and edge control | Cut cylinders, rings, or panels while protecting fragile edges and fibers. | Dimensional and visual inspection record. |
| 4. Dusting review | Check exposed edges, surface shedding, and interface with nearby graphite parts. | Surface-treatment confirmation or maintenance note. |
| 5. Low-compression packing | Pack insulation to avoid crushing, moisture exposure, and edge breakage. | Packing method and carton or crate photos. |
Yes, we supply custom-machined rigid cylinders, plates, and complex shapes.
Thickness should follow hot-zone diameter, target temperature, heat-loss target, and installation constraints rather than a generic insulation rule.
Use foil-faced or coated surfaces where process cleanliness matters, and define exposed edges and maintenance handling before production.
Yes. Segmentation is often used for large furnaces, limited chamber access, and safer export packing.
Inquiry Email
Include process, product type, drawing status, purity/coating target, dimensions, quantity forecast, operating conditions, and delivery date.
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