Geuda Heat Treatment Furnaces
Sri Lanka’s No. 1 Gem Heat Treatment Furnace
Lanka Refractories Limited proudly manufactures Sri Lanka’s leading Geuda Heat Treatment Furnace, trusted by the country’s foremost gemstone processors for precision, durability, and performance.
Recognized for engineering excellence, our furnace technology was honored with a Presidential Award in 1995, marking a significant milestone in Sri Lanka’s industrial manufacturing sector.
For decades, our furnaces have powered the transformation of Geuda stones into high-value sapphires and other precious gemstones, supporting the growth of Sri Lanka’s world-renowned gem industry.
Presidential Award · 1995
Industry Leadership & Recognition
Presidential Award Recipient – 1995
Proven track record serving leading gem processors nationwide
Engineered and manufactured locally with international-grade standards
Corundum heat treatment
Purpose-Built for Gemstone Enhancement
Geuda Heat Treatment Furnaces are specifically engineered for the thermal enhancement of corundum materials. Controlled high-temperature processing alters crystal structure and color characteristics, converting Geuda stones into:
- Blue Sapphires
- White Sapphires
- Yellow Sapphires
- Rubies
Precise control of temperature and furnace atmosphere ensures consistent color development and maximum gemstone value.
Up to 1950°C
Technical Specifications & Features
High Temperature Capability
- Maximum operating temperature up to 1950°C
- Suitable for advanced corundum heat treatment cycles
Heavy-Duty Firing Chamber
- Cylical chamber constructed using high-alumina refractory materials
- Designed for extreme thermal resistance and long service life
- Fully insulated for maximum heat retention and energy efficiency
- Stainless steel outer body for structural durability
Dual Gas Burner System
- Equipped with two high-performance gas burners
- Uniform heat distribution throughout the chamber
- Optimized for long-duration firing cycles
Atmosphere & Flow Control
- Integrated gas flow meters for precise oxygen and LPG regulation
- Capability to operate under oxidizing or reducing conditions
- Optional additional gas ports (Nitrogen / Hydrogen) for specialized treatments
Temperature Monitoring
- Provision for single or dual thermocouples
- Digital or analog temperature indicators
- Stable and accurate thermal control during critical soak periods
Cooling & Safety System
- Built-in water flow cooling system
- Protects burner assembly and structural components
- Enhances operational safety and equipment longevity
Lanka Refractories Limited
Why Choose Lanka Refractories?
- Market leader in Sri Lanka
- Presidential Award-winning manufacturing excellence
- Decades of industry experience
- Robust, industrial-grade construction
- Reliable technical support and after-sales service
- Designed specifically for Sri Lankan gem processing conditions