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Ruby

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Description

Ruby exhibits identical properties to those of Sapphire. Small amounts of impurities give Ruby a red colour.

Ashby charts

See where Ruby falls on the material property chart for Density against Elastic modulus in your materials selection and design process. Our Ashby charts are interactive with more technical data upon clicking. Sign up to get access to this premium feature for free.

Properties

General

Density

ρ

3.98 g/cm³ at 20 °C

Porosity

Vvoid

0 %

apparent porosity

Water absorption, equilibrium

cwater,equib

0 % at 20 °C

Mechanical

Compressive strength

Rmc

2100 MPa at 20 °C

Show Aluminium Oxide materials with Compressive strength of 2100 MPa at 20 °C

Elastic modulus

E

350 - 390 GPa at 20 °C

Show Aluminium Oxide materials with Elastic modulus of 350 - 390 GPa at 20 °C

Hardness, Knoop, HK2

HK2

2000 [-] at 20 °C

Show Aluminium Oxide materials with Hardness, Knoop, HK2 of 2000 [-] at 20 °C

Hardness, Vickers

HV

2500 - 3000 [-] at 20 °C

Show Aluminium Oxide materials with Hardness, Vickers of 2500 - 3000 [-] at 20 °C

Thermal

Coefficient of thermal expansion

α

5.8E-6 1/K at 100 °C

Max service temperature, continuous

Tmax,cont

1800 - 1950 °C

Melting point

Tm

2050 °C

Specific heat capacity

cp

750 J/(kg·K) at 25 °C

Thermal conductivity

λ

35 - 40 W/(m·K) at 20 °C

Electrical

Dielectric constant

εr

7.5 - 11.5 [-] at 20 °C

Dielectric strength

EDS

15 - 50 kV/mm at 20 °C

Electrical resistivity

ρel

1.00E+12 Ω·m at 25 °C

Technological properties

Color

Red

Corrosion properties

Good chemical resistance to: Acids (concentrated and diluted), alkalis, halogens, metals

Other

Useful optical transmission range: 150-5500nm

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This material data has been provided by Goodfellow.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.