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Hardboard Specifications

All DPI hardboard is smooth-two-sides (S2S) and is responsibly sourced and sustainably manufactured in the United States using a wet-dry process. DPI hardboard comes in 4x8 wall paneling sheets that can easily be cut and routed to your specification, with a clean edge free of untidy loose fibers.

1/8” Premium Hardboard

PropertyMinimum / MaximumAverage Value
Modulus of Rupture (MOR)≥5500 psi6500 psi
Internal Bond (PTS)≥80 psi120 psi
Humidified Thickness.105-in / .120-in.115-in
24 hr. Thickness Increase (TI)≤35%28%
Density (lbs./ft^3)-65
Moisture Content-3-5%
Formaldehyde Emissions-<.03 ppm

3/16” tempered premium hardboard

PropertyMinimum / MaximumAverage Value
Modulus of Rupture (MOR)≥5500 psi6500 psi
Internal Bond (PTS)≥90 psi120 psi
Humidified Thickness.170-in / .190-in.180-in
24 hr. Thickness Increase (TI)≤30%20%
Density (lbs./ft^3)-62
Moisture Content-3-5%
Formaldehyde Emissions-<.03 ppm

1/4" Premium Hardboard

PropertyMinimum / MaximumAverage Value
Modulus of Rupture (MOR)≥4300 psi4500 psi
Internal Bond (PTS)≥70 psi90 psi
Humidified Thickness.205-in / .235-in.215-in
24 hr. Thickness Increase (TI)≤30%20%
Density (lbs./ft^3)-54
Moisture Content-3-5%
Formaldehyde Emissions-<.03 ppm

Footnotes:  
1: NAUF (No Added Urea Formaldehyde) manufacturing process means DPI products are exempt from/automatically comply with CARB regulations for indoor air quality. 
2: To find DPI hardboard, please contact our team at 1-800-521-4301. You may also complete the form at the bottom of this page, and a member of our team will reach out to you as soon as possible.

Made in USA

Made in USA

100% of DPI products are sourced, manufactured, and finished in the USA and distributed across the globe.

We Are Green

We Are Green

As an eco-conscious ENERGY STAR® Partner, we promote the use of less energy without sacrificing product quality.

DPI Warranty

DPI Warranty

All DPI prefinished wall panels are backed by a limited product warranty to guarantee your satisfaction.