Glass Products & ACT

Johnson Matthey Noble Metals is a long-established supplier of platinum group metals (PGM). These alloys are inert in contact with molten glass and provide unequalled resistance to erosion.

Johnson Matthey is the only global fabricator offering a complete range of complementing PGM technologies for glass manufacturers.

ACT (Advanced Coating Technology)

ACT (Advanced Coating Technology) is our proven technology for ceramic protection, with coating thickness from 200 to 500 microns in platinum and 10% rhodium/platinum. This technology applies to all types of glass, including soda lime, crystal, borosilicate and opal glass.

Sintered ceramics such as zircon mullite and sillimanite are coated using a mix of flame and plasma deposition. They could be supplied as single items, or sets of forehearth and feeder consumables. In critical furnace areas, such as throats, ACT coatings are provided on fused cast ceramic blocks.

Fabrications & Linings, ZGS Platinum/Rhodium Alloys and Iridium

Fabrications are self-supporting parts or linings that are made of welded sheets of platinum/rhodium alloys. Johnson Matthey supplies sheet, tubes and more complex fabrications such as stirrers, feeder chambers, refiners or spout bowls.

For the most demanding applications, the use of platinum/rhodium alloys with dispersed zirconia particles (ZGS) can give increased mechanical strength and durability. Iridium fabrications or linings can be used at temperatures up to 2000°C in air. It has higher mechanical strength than ZGS platinum/rhodium alloys but may require some oxidation protection.

Johnson Matthey is market leader in the supply of iridium crucibles and other associated components used in the production of metal oxide single crystals (sapphire, YAG…).

Thermocouple Wire and Assemblies

Johnson Matthey is the market leader for precious metal thermocouple wire and assemblies. Thermocouple assemblies can be protected with precious metal, using a drawn tube with one end closed, or an ACT coating on an alumina sheath.

Precious Metal Recovery

Johnson Matthey offers full PGM recovery with typical metal returns of greater than 95%* for ACT coatings and greater than 98%* for all fabrications and linings.

ACT is a trademark of the Johnson Matthey Group of companies.

* Based on estimated returned weight

ACT Platinum Coating

In 1993, Johnson Matthey launched ACT - Advanced Coatings Technology. It consists of a thin layer of platinum applied to the surface of the ceramic, giving complete corrosion resistance against attack of molten glass. It provides 100% shape retention for the lifetime of the coating.

ACT relies strongly on the integrity of the ceramic substrate. It is ideal for long runs and limited thermal cycling. This technology applies to all types of glass, including soda lime, crystal, borosilicate and opal glass.

Sintered ceramics such as recrystallised alumina, zircon mullite and sillimanite are coated using a mix of flame and plasma deposition. They could be supplied as single items, or sets of forehearth and feeder consumables. In critical furnace areas, such as throats, ACT coatings are provided on fused cast ceramic blocks.

Johnson Matthey offers full precious metal recovery with typical metal returns of greater than 95%* for ACT coatings.

ACT is a trademark of the Johnson Matthey Group of companies.

* Based on estimated returned weight

Fabrications and Claddings/Linings

Platinum/rhodium alloys are inert in contact with molten glass and provide unequalled resistance to erosion. Fabrications (self-supporting parts) or linings are made of welded sheets of platinum/rhodium alloys. They withstand thermal cycling, ceramic cracking and exchange of contacting parts.

Johnson Matthey Noble Metals is a long-established supplier of platinum group metals (PGM). Johnson Matthey is the only global fabricator offering a complete range of complementing PGM technologies for glass manufacturers.

  • ZGS (Zirconia Grain Stabilised) gives increased strength and service life to platinum/rhodium fabrications & linings.
  • Iridium, one of the platinum group metals is used in fabrications or linings for the most innovative and demanding applications.

Johnson Matthey supplies sheet, tubes and more complex fabrications such as stirrers, feeder chambers, refiners or spout bowls.

Johnson Matthey also manufactures iridium crucibles and other associated components used in the production of metal oxide single crystals (sapphire, YAG…).

Johnson Matthey offers full precious metal recovery with typical metal returns greater than 98%* for all fabrications and linings.

* Based on estimated returned weight

Thermocouple Wire and Assemblies

Johnson Matthey supplies type R and S thermocouple wire (class 1) and type B thermocouple wire (class 2). Thermocouple assemblies can be protected from glass erosion or chemical attack using precious metal. This can be in the form of a drawn tube with one end closed, or an ACT® coating on an alumina sheath. Both types of thermocouple are proven to last the full furnace campaign and withstand high temperature applications such as the crown.

Johnson Matthey offers full precious metal recovery for thermocouple wires and thermocouple assemblies.