Paper Reinforced Phenolic is an exceptionally tough board made from wood fibre and phenolic polymers. The “X” designations generally distinguish manufacturing processes which result in different levels of electrical properties (i.e., dielectric strengths). Paper-based phenolics with enhanced mechanical and electrical properties are available in a variety of sheet, rod, and tube sizes. One of the most common applications for paper reinforced phenolic is printed circuit board substrates (PCB). These PCB materials are known as FR-1 and FR-2 – FR-2 is rated to 130 °C, FR-1 is rated to 105 °C.
Grades of Paper Reinforced Phenolic:
Grade X material results in a tough laminate with high impact resistance, excellent tensile, compressive and flexural strengths. Although it has excellent mechanical properties, it is not recommended for applications where electrical properties are important and humidity is high.
High impact strength.
Excellent tensile, compressive and flexular strengths.
Continuous operating temperature of 250F.
Great for Tooling Plates used in the production of printed circuit boards.
Perfect for stable, high-strength tabletops on routers & fabricating equipment.
Meets LP-509 Type PBM
Grade XX is copper in color and most commonly used in general electric insulation. Applications include barriers, breaker arms, switch panel boards, and relay and switch bases. This product meets the requirements of MIL-I-24768/11, Type PBG.
Extremely high mechanical strength
Low water absorption
Superior electrical characteristics
Grade XXX is recommended for most mechanical applications and properties because of its high dielectric strength and good resistance to moisture. Excellent choices for Grade XXX applications are intricate punch parts, insulating washers, spacers, terminal boards, switch bases and other electrical components.
Best electrical properties of paper based phenolics
High dielectric strength
Sheets meet MIL-I-24768/10, type PBE
Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.
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At a Glance
Generic Name Phenolics, Paper Reinforced
Available In Sheet, Rod, Tube
Certifications NEMA X per MIL-I-24768/12 PBM; NEMA XX per MIL-I-24768/11 PBG; NEMA XXX per MIL-I-24768/10 PBE
Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.
Water Absorption, 24 hrs
Tensile Strength – Lengthwise
Tensile Strength – Crosswise
Flexural Strength – Lengthwise
Flexural Strength – Crosswise
Flexural Modulus – Lengthwise
Flexural Modulus – Crosswose
Hardness, Rockwell R
IZOD Impact Strength Notched – Lengthwise
IZOD Impact Strength Notched – Crosshwise
Coefficient of Linear Thermal Expansion – Lengthwise
(x 10⁻⁵ in./in./°F)
Coefficient of Linear Thermal Expansion – Crosswise
Max Operating Temp
H – B
Dielectric Strength, 1/8″ th.
Dielectric Constant @ 1 MHz
Dissipation Factor @ 1 MHz
NOTE: The property values presented above are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.