SINTA® F19 Synthetic Fibers Data Sheet

Synthetic Micro Fiber for reinforcement of concrete (formerly 0.75” Grace Fiber™)

Product Description

SINTA® F19 synthetic fibers for concrete, are manufactured from 100% virgin polypropylene in collated, fibrillated form. Designed specifically for use in concrete, they are alkali resistant, non-absorptive and completely noncorrosive. Their use protects concrete from stresses which cause cracking while it is most vulnerable during the first 24 hours after placement. SINTA® F19 comply with ASTM Designation C1116, Standard Specification for Fiber-Reinforced Concrete and Shotcrete, Type III Synthetic Fiber-Reinforced Concrete or Shotcrete. They are available in 0.75 in. (19 mm) length.

Compliance and Certification

  • ASTM C1116 / C1116M, Standard Specification for Fiber-Reinforced Concrete, Type III Synthetic Fiber-Reinforced Concrete
  • Meets ICC ES AC32 criteria for Plastic Shrinkage Crack Reduction

Product Advantages

SINTA® F19 uniformly distribute multi-dimensionally throughout the concrete mixture. The small fibrillated fibers mechanically lock in the fresh concrete matrix providing reinforcement for the mixture while its tensile strength is the weakest. This reinforcement reduces the formation of plastic shrinkage cracking that may otherwise permanently weaken the resulting concrete. The concrete permeability is decreased, while the surface characteristics, impact and toughness properties are improved. Together these effects work synergistically to produce a long-term better quality, more durable and serviceable concrete.

  • Protects concrete when tensile strength is at its lowest, reducing the formation of plastic shrinkage cracking.
  • Enhances impact and toughness properties.
  • Easy to mix and fast to disperse.
  • Minimizes fiber-reinforced concrete finishing concerns.
  • Reduces plastic shrinkage cracking and improves durability.
  • Protects concrete from stresses that cause cracking.
  • Provides cost effective control of plastic shrinkage.
  • Provides overall higher quality of concrete.


SINTA® F19, at the approrpiate dosage rate, may be used as an alternative to light-gage welded-wire reinforcement (6x6 W1.4xW1.4), depending of the application.

SINTA® F19 may be used in applications where decreased plastic shrinkage cracking and improved durability are desired. Specifically, such application include but are not limited to, slabs on grade, pavements, overlays, sloped walls, pools, shotcrete, stucco, precast and prestressed products. It is suggested that this product be used in conjunction with properly compacted base materials and jointing in accordance with ACI guidelines and standards.

    Addition Rates

    SINTA® F19 may be added to concrete at any point during the batching or mixing process. SINTA® F19 may be added to the aggregate during weighing or charging, or to the central mixer or truck before, during, or after charging.  The concrete must be mixed at high speed for 5 minutes, or 70 revolutions, after the addition of SINTA® F19 to ensure uniform distribution.  The standard range of addition for SINTA® F19 is 0.75 to 3.0 lb/yd3 (450 to 1800 g/m3) of concrete. Typically, 1.5 lbs/yd3 (900 g/m3) of SINTA® F19 provides excellent results. Higher addition rates may be used to produce concrete when special properties are required.

    Compatibility with Other Admixtures

    SINTA® F19 is compatible with all GCP admixtures. Its action in concrete is purely mechanical and will not affect the hydration process. Each admixture should be added separately.

    SINTA® F19 Physical Properties

    Specific gravity 0.91
    Absorption None
    Modulus of elasticity 725 ksi (5 GPa)
    Tensile Strength 44 ksi (300 MPa)
    Melt point 320°F (160°C)
    Ignition point 1094°F (590°C)
    Alkali, acid and salt resistance High
    Material 100% virgin polypropylene
    Nominal Length 0.75 in. (19 mm)
    Nominal Fiber Count 25 million per lb.


    Fibers shall be 0.75 in. (19 mm) collated, fibrillated polypropylene fibers as supplied by GCP Applied Technologies, Cambridge, MA 02140. Required dosage rate shall be as specified by the design engineer or architect. SINTA® F19 shall be used in strict accordance with the supplier’s recommendations and within time as specified in ASTM C94. The fibers shall comply with ASTM Designation C1116 Type III and with applicable building codes. Certification of compliance shall be made available on request. Standard ACI 302 procedures for placing, finishing and curing shall be followed when using SINTA® F19.


    SINTA® F19 are available in convenient Concrete-Ready™ Bags which are added, unopened, to the truck drum or central mixer. The specially designed cellulose fiber bag disintegrates and disperses its contents of SINTA® F19, throughout the mix.

    Safety and Handling

    Read and understand the product label and Safety Data Sheet (SDS). All users should acquaint themselves with this information prior to working with the products and follow the precautionary statements. SDSs can be obtained by contacting your local GCP representative or office.


    Building Codes

    BOCA National Building Codes, SBCCI Standard Building Code, ICBO Uniform Building Code and all supplements as adopted by the Council of American Building Officials.

    American Concrete Institute (ACI)

    ACI 544.1 R State of the Art Report of Fiber-Reinforced Concrete

    ACI 302 Guide for Concrete Floor and Slab Construction

    American Society of Testing and Materials (ASTM)

    ASTM C1116 Standard Specification for Fiber-Reinforced Concrete and Shotcrete

    ASTM C1579 Standard Test Method for Evaluating Plastic Shrinkage Cracking of Restrained Fiber Reinforced Concrete (Using a Steel Form Insert)

    ASTM C94 Standard Specification for Ready-Mixed Concrete 

    Fire Classifications

    Underwriters Laboratories (UL) on Series D700 and D800 metal deck assemblies

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    We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

    SINTA, Grace Fibers and Strux are trademarks, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

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    GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6
    This document is only current as of the last updated date stated below and is valid only for use in the United States. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

    Last Updated: 2023-06-28