FRP (Fiber Reinforced Plastic)

FRP Spline Properties


Has much greater flexural strength than timber and pound-for-pound is often stronger than steel and aluminum in the lengthwise (LW) and clockwise direction (CW).

Ultimate flexural strength: (Fu): LW = 30,000 psi (30 ksi) CW = 10,000 psi (10 ksi)

Compression Strength

Compression strength: LW = 30,000 psi (30 ksi) CW = 15,000 psi (10 ksi)


Up to 3.3 times as rigid as timber. Will not permanently deform under working load.

Impact Resistance

Will not permanently deform under impact. Glass mat in pultruded parts distributes impact load to prevent surface damage, even in subzero temperatures.

Rot and Insect Resistance

Resists a broad range of chemicals and is unaffected by humid, moisture or immersion in water. Resists insect damage. Painting is only suggested when exposed to UV rays/direct sunlight.

Corrosion and Maintenance

Offering very long time durability as well as reliable resistance to corrosion, FRP is long-lasting and mitigates the need for any ongoing maintenance. The lack of required maintenance and repairs is eliminated.

For example, steel, or wood stuctures often fall apart 10 to 20 years after initial installation, when installed in humid or aggressive environment, requiring extremely expensive repairs or even a whole new investment to rebuild from scratch. FRP, however, is built to last and won’t experience any corrosion over time like many other construction materials

Thermal Properties

Good insulator with low thermal conductivity. Thermal conductivity = 4 (BTU in. /(hr ft2 °F) and Low thermal coefficient of expansion. = 7 – 8 (in./in./°F).

Electric Conductivity



Can be field-fabricated using simple carpenter’s tools with carbon or diamond tip blades.


Weighs 75% less than steel and 30% less than aluminum. Light weight allows easier transport and installation.