Hardboard Specs

1/8" Tempered Premium Hardboard

Property

Minimum/Maximum Average Value
Modulus of Rupture (MOR) ≥5500 psi 6500 psi
Internal Bond (PTS) ≥80 psi 120 psi
24 hr. Thickness Increase (TI) ≤35% 28%
Density (lbs./ft^3)   65
Moisture Content   3-5%
Formaldehyde Emissions 1   <.03 ppm

 

3/16" Tempered Premium Hardboard

Property Minimum/Maximum Average Value
Modulus of Rupture (MOR) ≥5500 psi 6500 psi
Internal Bond (PTS) ≥90 psi 120 psi
24 hr. Thickness Increase (TI) ≤30% 20%
Density (lbs./ft^3)   62
Moisture Content   3-5%
Formaldehyde Emissions 1   <.03 ppm

 

1/4" Tempered Premium Hardboard

Property Minimum/Maximum Average Value
Modulus of Rupture (MOR) ≥4300 psi 4500 psi
Internal Bond (PTS) ≥70 psi 90 psi
24 hr. Thickness Increase (TI) ≤30% 20%
Density (lbs./ft^3)   54
Moisture Content   3-5%
Formaldehyde Emissions 1   <.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