X Sheet

NEMA Grade X is the entry-level paper phenolic laminate — a thermoset composite of kraft paper layers impregnated with phenolic resin. It offers 35,000 psi tensile strength, basic electrical insulation, and excellent machinability at the lowest cost in the paper phenolic family. Grade X is governed by NEMA LI-1 and is used for general-purpose electrical panels, terminal blocks, fixture plates, and light-duty insulating components.

Both grades are kraft-paper phenolic laminates with identical tensile strength (35,000 psi) and flexural strength (34,000 psi), but Grade XX offers more consistent dielectric performance and is the standard choice for switchboards and general electrical systems. Grade X is the entry-level option suited for lighter-duty electrical and industrial applications where cost is the primary concern. If reliable dielectric consistency is required, Grade XX is the appropriate choice.

Ready Plastics stocks Grade X paper phenolic in sheet and rod form. Phenolic x sheet is the most common stocked form, available in a range of standard thicknesses and sheet sizes. Cut-to-size is available on every SKU — contact us or see the product page for current size inventory and minimum order requirements.

Yes. Grade X machines readily on conventional mill, lathe, drill press, and router equipment using standard carbide tooling. It cuts cleanly and punches or stamps efficiently in production runs. Use sharp tooling, moderate feed rates, and dust extraction — phenolic dust is abrasive and should not be inhaled. Note that paper phenolic grades are more brittle than cotton phenolic and should not be used in applications requiring high impact resistance.

No. Grade X is the entry-level electrical grade and is not recommended for high-voltage or demanding dielectric applications. For higher dielectric strength, choose Grade XXX paper phenolic. For the highest electrical performance in a phenolic laminate, glass-epoxy laminates (G-10/FR-4) are the appropriate choice. Grade X is best suited for light-duty electrical insulation where economy is the primary design driver.