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GLASSMATE®-HT Graphite

An intergral oxidation inhibitor makes this the optimal material for high-heat applications (above 450°C) where graphite typically oxidizes, raising the oxidation temperature to 600°C.

  • Average particle size of less than 5 microns provides high material strength and resistance to damage
  • Elevates oxidation threshold to 600°C for high-temperature applications
  • Low thermal conductivity reduces checking in the neck and shoulders of larger bottles, increasing yield
  • Improved wear-resistance characteristics extend product life, minimizing costly replacements and downtime

Our graphite grades are available as semi-finished rods, blocks, plates, and fully machined parts. 

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Applications

  • High temperature production runs
  • Mold top inserts
  • Creations of larger glass containers

Specifications

Particle size
 5 µm (197 µin)
Apparent density 1.74 g/cm3 (0.063 lb/in3)
Compressive strength 136 MPa (19,700 psi)
Flexural strength1 81 MPa (11,800 psi)
Shore hardness 74
Coefficient of thermal expansion 
 8.1 µm/m°C (4.5 µin/in°F)
Thermal conductivity2 85 W/m-K (50 Btu-ft/hr/ft2°F)
Purity <3000 ppm ash
Oxidation threshold3 1,125°F (607°C)

1Measured using three-point bend method. 2Approximate values taken at room temperature; as temperature increases, thermal conductivity decreases. 3Oxidation threshold defined as temperature at which oxidation weight loss after 24 hours is approximately 1%. (Size 0.5" x 0.5" x 1").

Documentation

Grade Chart

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GLASSMATE® Graphite Grades Table
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