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.
Industry Leadership & Recognition
1
No. 1 Geuda Furnace Manufacturer in Sri Lanka
2
Presidential Award Recipient – 1995
3
Proven track record serving leading gem processors nationwide
4
Engineered and manufactured locally with international-grade standards
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.
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
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