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Grade 8 (L53565) Lead-Base Babbitt Metal

Grade 8 Babbitt Metal is a lead alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. L53565 is the UNS number for this material. Additionally, the ASTM designation is Babbitt Grade 8.

It has a moderately low heat capacity among the alloys in the same category in the database.

The graph bars on the material properties cards below compare grade 8 Babbitt Metal to: lead alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness


Compressive (Crushing) Strength

110 MPa 16 x 103 psi

Elastic (Young's, Tensile) Modulus

24 GPa 3.5 x 106 psi

Poisson's Ratio


Shear Modulus

8.5 GPa 1.2 x 106 psi

Tensile Strength: Yield (Proof)

23 MPa 3.4 x 103 psi

Thermal Properties

Latent Heat of Fusion

46 J/g

Melting Completion (Liquidus)

270 °C 520 °F

Melting Onset (Solidus)

240 °C 460 °F

Specific Heat Capacity

150 J/kg-K 0.035 BTU/lb-°F

Thermal Conductivity

24 W/m-K 14 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

19 % relative


10 g/cm3 650 lb/ft3

Embodied Carbon

3.9 kg CO2/kg material

Embodied Energy

53 MJ/kg 23 x 103 BTU/lb

Embodied Water

840 L/kg 100 gal/lb

Common Calculations

Resilience: Unit (Modulus of Resilience)

11 kJ/m3

Stiffness to Weight: Axial

1.3 points

Stiffness to Weight: Bending

9.2 points

Thermal Diffusivity

16 mm2/s

Alloy Composition

Lead (Pb)Pb 77.1 to 81.2
Antimony (Sb)Sb 14 to 16
Tin (Sn)Sn 4.5 to 5.5
Arsenic (As)As 0.3 to 0.6
Copper (Cu)Cu 0 to 0.5
Iron (Fe)Fe 0 to 0.1
Bismuth (Bi)Bi 0 to 0.1
Cadmium (Cd)Cd 0 to 0.050
Aluminum (Al)Al 0 to 0.0050
Zinc (Zn)Zn 0 to 0.0050

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Engineering Properties and Applications of Lead Alloys, Sivaraman Guruswamy, 1999

ASTM B23: Standard Specification for White Metal Bearing Alloys (Known Commercially as Babbitt Metal)