CRA

Range
Expendables
Subtitle

Mullite material

Description

CRA is well adapted to increase lifetime of Danner mandrels and reduce glass defects. CRA has better surface quality compared to other materials.

Chemical and physical properties

Typical chemical composition

 
 

Typical crystallographic analysis

Main phase: 

  • mullite

Secondary phase: 

  • corundum
  • silicate

Physical characteristics

Description International standards British standards
Typical bulk density 2.30g/cm3 143pcf
Open porosity 25% 25%
Refractoriness under load 2 105 Pa, 0.5% at 1,600°C 2,912°F
Coefficient of thermal expansion 5.5 10-6K-1 3 10-6°F-1
Thermal conductivity at 1,000°C 1.4 W.m-1.K-1 9.7 BTU in hr-1 ft-2°f-1
Thermal shock resistance poor poor

 

Typical application

  • danner mandrels (lighting and pharmaceutical tubes).

Due to its low thermal shock resistance, CRA needs an adapted heating-up.

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