MACOR® Machinable Glass Ceramic

MACOR® Machinable Glass Ceramic

The MACOR® :

When the constraints linked to the application are less demanding (temperature and wear for example), the MACOR® machinable glass ceramic offers an easy and relatively efficient alternative to FRIALIT-DEGUSSIT technical ceramics. This white, dense and very smooth material can be machined on conventional machining centres, which results in a gain in flexibility and time compared to sintered ceramics, which require grinding with diamond wheels and tools. MACOR® machinable glass ceramics can be used to achieve very tight tolerances and polished surfaces.

The advantages of MACOR® :

MACOR® Machinable Glass Ceramic

  • Short lead times, no need to anneal after machining.
  • Maximum operating temperature of 800 °C continuous and 1000 °C peak.
  • Offers tight tolerances, down to 0.01 mm. Possibilities are limited only by the tooling available and the experience of the machinist.
  • Versatile, tough material with insulating properties that exceed those of high performance plastics.
  • Clean, no outgassing and zero porosity.
  • Will not deform, unlike ductile materials.
  • Low thermal conductivity, excellent electrical insulator.
  • Radiation resistant.
  • Can be brazed to other materials.

Fast production process :


  • Ordinary machining tools
  • Design of complex geometries
  • No annealing required after machining
  • Efficiency and cost effectiveness
  • Shortened delivery time

Click here to download the MACOR® machining details as a PDF.

Blanks in stock:

In Paris, we have raw maxi-slabs of MACOR® (useful dimensions: 317 x 317 x 54 mm) as well as raw bars of MACOR® (useful dimensions: Diam. 76 x 311 mm) in stock. These raw blanks are offered in the form of semi-finished products: plates, bars, strips, etc. or as parts according to customer drawings.

Properties of MACOR® machinable glass ceramic:

 Click here to download the properties of MACOR® as a PDF.

I. Thermals

Dialation coefficient

   CTE-100°C → 25°C

   CTE 25°C → 300°C

   CTE 25°C → 600°C

   CTE 25°C → 800°C


8,1 × 10-6 /°C

9 × 10-6 /°C

11,2 × 10-6 /°C

12,3 × 10-6 /°C

Specific heat, 25°C 0.79 kJ/kg°C
Thermal conductivity, 25°C 1,46 W/m°C
Thermal diffusivity, 25°C 7,3× 107 m2/s
Recommended operating temperature 800°C
Maximum temperature (peak) 1000°C


II. Mechanics
Density 2,52 g/cm3
Porosity 0%

Young's Module, 25 °C

(Modulus of elasticity)

66,9 GPa
Poisson's ratio 0,29
Shear modulus, 25 °C 25,5 GPa
Knoop hardness, 100g 250 kg/mm2

Modulus of rupture, 25 °C

(Flexural strength)

94 MPa

(Minimum specified average value)

Compressive strength

(After polishing)

345 MPa
upto 900 MPa


III. Electrics

Dielectric constant, 25°C

             1 kHz

             8.5 GHz




Loss angle tangent, 25°C

             1 kHz

           8.5 GHz




Average dielectric strength (AC)

(at 25 °C under 0.03 mm thickness)


Average dielectric strength (DC)

(at 25 °C and 0.03 mm thickness)

129 kV/mm
DC volume resistivity, 25 °C 1017



IV. Chemicals

 Weight loss (mg/cm2)






5% HCl

(Hydrochloric acid)


24 h



0,002 N HNO3

(Nitric acid)

2,8 24 h 95°C           ~0,6

0,1 N NaHCO

(Sodium bicarbonate)

8,4 24 h 95°C           ~0,3

0,02 N Na2CO3

(Sodium Carbonate)

10,9 6 h 95°C            ~0,1

5% NaOH

(Sodium Hydroxide)

13,2 6 h 95°C ~10

Chemical durability



DIN 12111 / NF ISO 719 Water HGB2
DIN 12116 Acid 4
DIN 52322 / ISO 695 Alkaline A3

Technical data of MACOR® machinable glass ceramics:

 Click here to download the technical data of MACOR® as a PDF.






The general characteristics indicated are based on periodic tests carried out in Corning laboratories on samples.

Properties may vary slightly from batch to batch.

MACOR® Machinable Glass Ceramic is a registered trademark of Corning Incorporated, Corning, NY

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