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NEMA Grade X (PBM) Paper-Phenolic Laminate

NEMA grade X is a grade of NEMA laminate. The graph bars on the material properties cards below compare NEMA grade X to other thermoset plastics (top) 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

Compressive (Crushing) Strength

190 MPa 27 x 103 psi

Flexural Modulus

11 GPa 1.6 x 106 psi

Flexural Strength

160 MPa 23 x 103 psi

Impact Strength: Notched Izod

28 J/m 0.53 ft-lb/in

Rockwell M Hardness


Shear Strength

83 MPa 12 x 103 psi

Tensile Strength: Ultimate (UTS)

120 MPa 18 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

130 °C 270 °F

Thermal Expansion

20 µm/m-K

Other Material Properties


1.4 g/cm3 85 lb/ft3

Dielectric Strength (Breakdown Potential)

19 kV/mm 0.75 V/mil

Water Absorption After 24 Hours

3.5 %

Common Calculations

Strength to Weight: Axial

25 points

Strength to Weight: Bending

41 points

Followup Questions

Further Reading

NEMA LI 1: Industrial Laminated Thermosetting Products

Thermosets: Structure, Properties and Applications, Qipeng Guo (editor), 2012