FORTA® ULTRA-NET® is an easy to finish, color blended, fully oriented, 100% virgin homopolymer polypropylene fibrous reinforcement in a unique twisted-bundle, collated fibrillated (network) form.
FORTA® ULTRA-NET® is used to reduce plastic and hardened concrete shrinkage, improve impact strength, increase fatigue resistance and concrete toughness. This extra heavy-duty fiber offers ULTRA-NETWORKING power, maximum long-term durability, and true secondary/temperature control by incorporating a fibrillated pattern and long length option. Non-corrosive, non-magnetic and 100% Alkali Proof!
FORTA Corporation’s technical recommendations regarding synthetic fiber characteristics are based on years of engineering research and scores of concrete projects. FORTA has developed a simple 4 C’s formula to help choose the right fiber for any concrete project application. Synthetic fibrous reinforcement shall be used in the areas denoted in plans, and shall comply with the following fiber characteristics:
Configuration: Fiber shall be in fibrillated network form.
Chemistry: Fiber shall be made of 100% virgin materials in the form of fully-oriented polypropylene, tan in color.
Contents: Fibers shall be used at a minimum dosage rate of 1.6 lbs per cubic yard of concrete (1 kg per cubic meters of concrete).
Correct Length: Fiber length shall be a minimum of 3/4 in (19 mm). Longer length fibers shall be used based on the top size of the mix coarse aggregate (per ASTM C-33) as follows:
Aggregate Top Size
Fiber Length
1/4 in
(6 mm)
3/4 in
(19 mm)
1/2 in
(13 mm)
1-1/2 in
(38 mm)
3/4 in
(19 mm)
2-1/4 in
(54 mm)
1+ in
(25+ mm)
2-1/2 in
(60 mm)
Compliance: Fibers shall comply with ASTM C-1116 “Standard Specification for Fiber Reinforced Concrete and Shotcrete” and applicable national building code. The approved product is FORTA® Ultra-Net® as manufactured by FORTA Corporation, Grove City, PA, U.S.A.
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