Designed for Glass Mold Manufacturing and Repair

Glass molds experience repeated thermal cycling, mechanical contact, oxidation and localized wear during production. The alloy deposited on the mold must therefore provide more than simply high hardness.

GREENSTONE glass industry alloy powders are formulated to achieve a practical balance of wear resistance, thermal stability, oxidation resistance, machinability and resistance to cracking under cyclic thermal loading.

They can be used for both new mold manufacturing and worn mold remanufacturing, helping restore dimensions and reinforce critical working surfaces.

Ni-B-Si Self-Fluxing Alloy Powder

Low- and medium-hardness Ni-B-Si self-fluxing powders provide good melting and wetting behavior together with relatively low coating brittleness.

Typical hardness is approximately HRC 22–30, depending on composition and deposition parameters.

These powders are suitable for applications where machinability, thermal cycling performance and controlled hardness are more important than maximum abrasion resistance.

Ni-Cr-B-Si Alloy Powder

The addition of chromium improves oxidation, corrosion and wear resistance while maintaining the favorable processing characteristics of a nickel-based self-fluxing system.

GREENSTONE Ni-Cr-B-Si powders are suitable for glass mold edges, neck-ring areas, guide surfaces, contact surfaces and other localized wear zones.

Typical hardness ranges from approximately HRC 25–32 for the compositions represented in this product family.

Laser Cladding Powder for Glass Molds

Laser cladding provides controlled heat input and a relatively small heat-affected zone, making it particularly useful for precision restoration of high-value glass mold components.

GREENSTONE laser cladding powders are available with controlled particle-size distributions suitable for automated powder feeding. The process can produce a metallurgically bonded functional layer while minimizing unnecessary thermal influence on the mold substrate.

Typical applications include localized dimensional restoration, edge rebuilding, worn-surface repair and preventive surface reinforcement.

PTA Powder for Glass Mold Hardfacing

PTA welding provides efficient metallurgical deposition and is suitable for larger repair areas or applications requiring relatively high deposition efficiency.

Selected Ni-Cr-B-Si compositions are available for PTA hardfacing of glass mold components, offering good wetting behavior and stable processing characteristics.

Oxy-Fuel Powder Welding

Fine nickel-based self-fluxing powders can also be supplied for oxy-acetylene / oxy-fuel powder welding, a well-established process for localized glass mold repair.

These compositions are designed to provide good fusion and wetting characteristics while maintaining the moderate hardness and machinability required for subsequent finishing.

Suitable for Cast-Iron Glass Molds

Many container-glass molds use cast-iron-based substrates. The relatively moderate hardness and controlled melting characteristics of these nickel-based powders make them suitable for appropriately prepared cast-iron glass mold components.

Final alloy selection should consider the substrate grade, mold geometry, repair depth, preheating conditions, deposition method and required post-machining.

Key Advantages

• Specially suited to glass mold repair and remanufacturing
• Typical hardness range of approximately HRC 22–32
• Good resistance to thermal cycling and oxidation
• Good wetting and self-fluxing characteristics
• Controlled hardness helps reduce excessive brittleness
• Good machinability for post-cladding finishing
• Suitable for laser cladding, PTA and oxy-fuel powder welding
• Strong metallurgical bonding on compatible substrates
• Suitable for both localized repair and preventive surface reinforcement
• Multiple particle-size distributions available for different deposition technologies
• Chemistry and particle size can be customized according to glass mold application