Laboratory Graphite Boat and Combustion Boat for Tube Furnace
Product Overview
Our laboratory graphite boats and combustion boats are precision-machined crucibles used to hold samples during high-temperature experiments in tube furnaces, muffle furnaces, and induction furnaces. Made from high-purity graphite, these boats withstand temperatures up to 3000°C in vacuum or inert gas and do not contaminate sensitive samples. Their smooth interior surfaces allow easy sample removal and cleaning between experiments. We supply a range of standard sizes and can custom-machine boats to fit any tube furnace diameter.
Graphite boats are essential consumables for materials research, powder synthesis, catalyst testing, carbonization studies, and ash fusion analysis. At Jincheng Graphite, we manufacture boats from fine-grain high-purity graphite with minimal ash content, ensuring that experimental results are not affected by leachable impurities. Each boat is precision-machined with consistent wall thickness and a smooth finish for reliable, repeatable laboratory use.
Key Features
- High purity - low ash content prevents sample contamination
- Extreme temperature resistance - usable up to 3000°C in vacuum or inert gas
- Precision machined interior - smooth walls for easy sample retrieval and cleaning
- Standard and custom sizes - fit any tube furnace diameter from 10 mm to 100 mm
- Good thermal conductivity - ensures even sample heating
- Resistant to thermal shock - handles rapid temperature changes without cracking
- Lightweight - easy to handle and position in tube furnaces
- Reusable - can be cleaned and reused for many experiments
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-purity fine-grain graphite |
| Bulk Density | 1.75 - 1.85 g/cm³ |
| Ash Content | < 200 ppm (ultra-pure available) |
| Max Temperature | 3000°C (vacuum/inert) |
| Standard Boat Sizes | 20×10×10 mm to 100×40×20 mm |
| Wall Thickness | 2 - 5 mm |
| Bottom Thickness | 2 - 5 mm |
| Surface Finish | Ra 1.6 - 3.2 µm |
| Dimensional Tolerance | ±0.2 mm |
| Special Shapes | Rectangular, cylindrical, groove, notch |
| Custom Length | Up to 300 mm |
| Coating Option | SiC-coated for corrosive samples |
Applications
- Materials research - sample holders for high-temperature tube furnace experiments
- Powder synthesis - ceramic powder, catalyst, and nanoparticle synthesis
- Carbonization studies - carbon and polymer pyrolysis experiments
- Ash fusion analysis - combustion boats for ash melting point testing
- Catalyst testing - catalyst reduction and reaction studies in controlled atmospheres
- Heat treatment research - small-batch sample annealing and sintering studies
Why Choose Jincheng Graphite?
- Laboratory-grade purity - low-ash graphite for contamination-free experiments
- Wide standard range - common boat sizes in stock for immediate shipping
- Custom machining - boats tailored to your specific tube furnace and sample size
- Ultra-pure option - ash below 50 ppm for sensitive semiconductor research
- SiC coating option - for reactive or corrosive sample materials
- Small quantity orders - we accept single-piece and small-batch orders
- Fast delivery - standard boats ship within 3-5 business days
- Global shipping - supplying universities and research labs worldwide
FAQ
Q: Can you make a graphite boat to fit my specific tube furnace?
A: Yes. Tell us your tube inner diameter and required boat length/width/height, and we will machine a boat that slides easily into your tube while maximizing sample capacity. We can also add notches or grooves for thermocouple placement.
Q: Can graphite boats be used in air?
A: Graphite oxidizes in air above about 500°C. For experiments in air, use alumina or quartz boats instead. Graphite boats are designed for vacuum, inert gas (argon, nitrogen), or reducing atmosphere environments.
Q: How do I clean and reuse graphite boats?
A: Allow the boat to cool completely, then gently remove residual sample with a soft brush. For stubborn residues, sand the interior lightly with fine abrasive paper or machine-light. Avoid aggressive acids that can attack the graphite.
Q: What is the minimum order quantity?
A: We accept single-piece orders for standard lab boats. Custom-shaped boats may have a small minimum order to cover setup, but we are flexible for research and laboratory customers.
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