Opaque Fused Quartz Crucibles for Material Melting & Testing -TOQUARTZ®
Properties of Opaque Fused Quartz Crucibles
TOQUARTZ® opaque fused quartz crucibles combine exceptional physical properties with precise manufacturing to deliver reliable performance in demanding laboratory and industrial applications..
Thermal Conductivity
High thermal conductivity (120-160 W/m·K) ensures uniform heat distribution, reducing thermal gradients and preventing localized overheating during material processing.
Chemical Corrosion Resistance
Resists most acids, alkalis, and salt solutions except hydrofluoric acid and phosphoric acid. Maintains structural integrity during aggressive chemical reactions, extending crucible lifespan.
High Temperature Resistance
Withstands temperatures above 1100°C with minimal thermal expansion (CTE: 5.5×10⁻⁷/°C), providing excellent thermal shock resistance for laboratory and industrial heating applications.
- Excellent Thermal Conductivity
- High Temperature Resistance
- Superior Chemical Resistance
Dimensions of Opaque Fused Quartz Crucibles
Size of of Opaque Arc Shaped Fused Quartz Crucibles
| Model | Capacity (ml) | Bottom Diameter (mm) | Height (mm) | SiO₂ Content (%) |
| AT-SY-RG001 | 5 | 25 | 33 | 99.9-99.98 |
| AT-SY-RG002 | 10 | 30 | 40 | 99.9-99.98 |
| AT-SY-RG003 | 15 | 34 | 48 | 99.9-99.98 |
| AT-SY-RG004 | 20 | 38 | 52 | 99.9-99.98 |
| AT-SY-RG005 | 25 | 42 | 58 | 99.9-99.98 |
| AT-SY-RG006 | 30 | 45 | 60 | 99.9-99.98 |
| AT-SY-RG007 | 50 | 55 | 70 | 99.9-99.98 |
| AT-SY-RG008 | 100 | 70 | 95 | 99.9-99.98 |
| AT-SY-RG009 | 150 | 80 | 105 | 99.9-99.98 |
| AT-SY-RG010 | 200 | 90 | 115 | 99.9-99.98 |
| AT-SY-RG011 | 250 | 95 | 130 | 99.9-99.98 |
| AT-SY-RG012 | 500 | 115 | 165 | 99.9-99.98 |
| AT-SY-RG013 | 1000 | 140 | 200 | 99.9-99.98 |
| AT-SY-RG014 | 2000 | 170 | 245 | 99.9-99.98 |
Size of of Opaque Square Quartz Glass Crucibles
| Model | Length (mm) | Width (mm) | Height (mm) | SiO₂ Content (%) |
| AT-SY-RG015 | 60 | 40 | 17 | 99.9-99.98 |
| AT-SY-RG016 | 80 | 25 | 25 | 99.9-99.98 |
| AT-SY-RG017 | 85 | 85 | 30 | 99.9-99.98 |
| AT-SY-RG018 | 137 | 73 | 35 | 99.9-99.98 |
| AT-SY-RG019 | 140 | 80 | 40 | 99.9-99.98 |
| AT-SY-RG020 | 155 | 94 | 33 | 99.9-99.98 |
| AT-SY-RG021 | 200 | 200 | 50 | 99.9-99.98 |
| AT-SY-RG022 | 225 | 56 | 22 | 99.9-99.98 |
| AT-SY-RG023 | 230 | 94 | 90 | 99.9-99.98 |
| AT-SY-RG024 | 264 | 175 | 75 | 99.9-99.98 |
| AT-SY-RG025 | 275 | 125 | 60 | 99.9-99.98 |
Size of of Opaque Cylindrical Quartz Crucible
| Model | Diameter (mm) | Height (mm) | SiO₂ Content (%) |
| AT-SY-RG026 | 20 | 30 | 99.9-99.98 |
| AT-SY-RG027 | 25 | 38 | 99.9-99.98 |
| AT-SY-RG028 | 50 | 15 | 99.9-99.98 |
| AT-SY-RG029 | 50 | 30 | 99.9-99.98 |
| AT-SY-RG030 | 128 | 138 | 99.9-99.98 |
| AT-SY-RG031 | 148 | 120 | 99.9-99.98 |
| AT-SY-RG032 | 165 | 125 | 99.9-99.98 |
| AT-SY-RG033 | 182 | 152 | 99.9-99.98 |
| AT-SY-RG034 | 205 | 165 | 99.9-99.98 |
TOQUARTZ® Solving Challenges with Opaque Fused Quartz Crucibles
Opaque Quartz Crucibles for High Temperature Materials Research
Key Advantages
- Withstands rapid heating from 25°C to 1000°C in under 10 minutes without microcracking.
- Maintains amorphous silica structure after 100+ thermal cycles between 200°C and 1100°C.
- Micro-bubble matrix reduces internal stress propagation during abrupt temperature shifts.
- Surface remains vitreous and non-crystalline even after prolonged high-temperature exposure.
TOQUARTZ® solution
In high-temperature synthesis experiments, researchers observed crucible failure after 20 thermal cycles due to devitrification and microfractures.
TOQUARTZ® opaque quartz crucibles maintained structural integrity after 100+ cycles at 1100°C, enabling uninterrupted compound development and consistent thermal analysis results.
Opaque Quartz Crucibles in Industrial Furnace Applications
Key Advantages
- No deformation or wall thinning after 72-hour furnace operation at 1150°C.
- Milky-white surface ensures even radiant heat absorption and distribution across crucible walls.
- Minimizes stress-induced cracking during furnace ramp-up and cooldown phases.
- Supports 2kg ceramic payloads at 1100°C without dimensional distortion.
TOQUARTZ® solution
During ceramic sintering, previous crucibles deformed after 48 hours at 1100°C, causing uneven heating and product defects.
TOQUARTZ® opaque quartz crucibles retained shape and thermal uniformity over 72-hour cycles, improving yield consistency and reducing furnace downtime by 30%.
Opaque Quartz Crucibles for Laboratory Analysis & Testing
Key Advantages
- No detectable SiO₂ leaching (<0.01 ppm) during 3-hour ignition at 1000°C.
- ±0.1mm height variation after 50 cycles between 200°C and 1000°C.
- No reaction with HNO₃, HCl, NaOH, or oxidizing agents under standard lab conditions.
- <0.05% weight loss after 10 repeated ignition cycles at 950°C.
TOQUARTZ® solution
A materials lab reported inconsistent LOI results due to silica contamination from previous crucibles.
After switching to TOQUARTZ® opaque quartz crucibles, contamination dropped below 0.01 ppm, enabling accurate ash content analysis and compliance with ASTM D482 standards.
Customization Services for TOQUARTZ® Opaque Fused Quartz Crucibles
Custom Dimensions
We manufacture custom-sized crucibles according to your technical drawings or specifications. Our manufacturing process achieves dimensional tolerances of ±0.2mm for critical applications requiring precise fit and function.
Special Shapes
Beyond standard round, square, and cylindrical designs, we create specialized geometries including conical, oval, and multi-chamber crucibles. Our engineering team can help optimize designs for specific thermal processing applications.
Technical Consultation
TOQUARTZ® engineering team provides technical consultation to optimize crucible designs for your specific application. We analyze thermal profiles, chemical compatibility, and mechanical requirements to recommend the ideal crucible configuration.
TOQUARTZ® Customization Manufacturing Process
Requirements Analysis
We analyze your technical requirements, application environment, and performance expectations.
Design & Engineering
Our engineers develop a crucible design optimized for your specific application needs.
Prototype & Testing
We manufacture prototype crucibles for your evaluation and testing in actual use conditions.
Production & Delivery
Approved designs move to production with strict quality control and efficient delivery scheduling.
Usage Guidelines for Opaque Fused Quartz Crucibles
Handling & Storage
- Handle with clean, dry tools. Use ceramic or quartz tongs rather than metal tools to prevent surface scratches.
- Store in a clean, dry environment free from dust and contaminants. Keep separate from metal containers or tools.
- Inspect before each use for microscopic cracks or damage. Retire damaged crucibles to prevent catastrophic failure.
Chemical Compatibility
- Avoid direct contact with hydrofluoric acid (HF) and phosphoric acid, which attack silica-based materials.
- Limit extended exposure to strong alkali solutions at high temperatures, which can gradually erode silica.
- Clean thoroughly after use. Residual compounds may react with the crucible surface during subsequent heating cycles.
Temperature Management
- Avoid rapid temperature changes. Heat and cool gradually at rates of 100-150°C per hour to prevent thermal shock.
- For maximum service life, maintain operating temperatures below 1100°C for extended periods.
- Pre-heat crucibles at 200°C for 30 minutes before high-temperature operations to remove moisture.
Cleaning Procedures
- Clean with ultrapure water and mild detergent. For stubborn residues, soak in dilute nitric acid (10%) for 2-4 hours.
- Rinse thoroughly with deionized water after cleaning. Air dry or heat at 110°C for 30 minutes.
- For analytical applications, perform a thermal cleaning cycle at 800°C for 1 hour to remove organic contaminants.
Need Custom Opaque Quartz Crucibles for Your Application?
Send us your technical drawings or specifications for a prompt quotation and manufacturing assessment.
Why Partner with TOQUARTZ
Direct Factory Advantage
As a direct manufacturer, we can cut out the numerous intermediate links.
Engineering Expertise
Technical team guides clients from material selection to design optimization, translating specs into deliverables.
Flexible Manufacturing
Handling standard & custom orders via small-batch expertise and prototyping rigor to meet urgent deadlines.
Quality
Assurance
Pre-shipment 3-step validation:
1. dimensional accuracy,
2. material purity ,
3. performance thresholds
Global Supply Chain
Reliable global logistics to industrial hubs (DE/US/JP/KR priority) with trackable milestones.
Releted Products
As a specialized manufacturer with direct factory capabilities, TOQUARTZ provides both standard and custom quartz solutions with engineering support throughout the specification and implementation process.
FAQ
Q: What is the difference between opaque and transparent quartz crucibles?
A: Opaque quartz crucibles contain numerous micro-bubbles that scatter light, creating a milky white appearance. These bubbles provide better thermal insulation and more uniform heat distribution compared to transparent crucibles. Opaque crucibles also typically offer better resistance to devitrification and thermal shock.
Q: Are your opaque quartz crucibles suitable for metal melting applications?
A: TOQUARTZ® opaque quartz crucibles are suitable for melting certain metals with melting points below 1100°C. However, for reactive metals or alloys that may interact with silica at high temperatures, we recommend consulting our technical team to ensure compatibility and to discuss possible alternatives or protective coatings.
Q: Can you manufacture crucibles with lids or covers?
A: Yes, we manufacture matching lids and covers for our opaque quartz crucibles. These can be designed with various features including vents, lifting handles, or recessed edges for secure placement. Custom lid designs are also available to accommodate specific process requirements.
Q: How does the thermal conductivity of opaque quartz crucibles compare to other materials?
A: With thermal conductivity values of 120-160 W/m·K, opaque quartz crucibles offer significantly better heat transfer than ceramic alternatives (typically 2-30 W/m·K) while providing better chemical inertness than metal crucibles. This balance makes them ideal for applications requiring uniform heating with minimal sample contamination.
Q: Can your crucibles be used in vacuum environments?
A: Yes, our opaque quartz crucibles are suitable for vacuum applications up to 10⁻⁶ Torr. The material doesn’t outgas significantly at elevated temperatures, making it compatible with vacuum furnace operations. For ultra-high vacuum applications, special processing may be required to minimize potential gas release.
Contact our engineering team for technical consultation and pricing. We’ll help you select the optimal specifications for your application requirements.