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Grade 15 (L53620) Lead-Base Babbitt Metal

Grade 15 Babbitt Metal is a lead alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. L53620 is the UNS number for this material. Additionally, the ASTM designation is Babbitt Grade 15.

It has the lowest base cost among alloys in the same category. In addition, it has the lowest embodied energy and a fairly low heat capacity.

The graph bars on the material properties cards below compare grade 15 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


Elastic (Young's, Tensile) Modulus

23 GPa 3.3 x 106 psi

Poisson's Ratio


Shear Modulus

8.2 GPa 1.2 x 106 psi

Thermal Properties

Latent Heat of Fusion

46 J/g

Melting Completion (Liquidus)

280 °C 540 °F

Melting Onset (Solidus)

250 °C 480 °F

Specific Heat Capacity

140 J/kg-K 0.035 BTU/lb-°F

Thermal Expansion

26 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

17 % relative


10 g/cm3 650 lb/ft3

Embodied Carbon

3.6 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

840 L/kg 100 gal/lb

Common Calculations

Stiffness to Weight: Axial

1.2 points

Stiffness to Weight: Bending

9.0 points

Alloy Composition

Lead (Pb)Pb 79 to 83.9
Antimony (Sb)Sb 14.5 to 17.5
Arsenic (As)As 0.8 to 1.4
Tin (Sn)Sn 0.8 to 1.2
Copper (Cu)Cu 0 to 0.6
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)