Synthetic fiber for concrete ASTM C1116, ASTM C94 (formerly Grace microfiber)

Product Description

SINTA™ M is a synthetic fiber for concrete, manufactured from 100% virgin polypropylene in a microfilament form. SINTA™ M is produced on a state-of-the-art production line which is specifically designed to yield an ultrathin concrete reinforcing fiber. SINTA™ M contains over 50 million individual fibers for each 1.0 lb/yd3 dosed. Engineered specifically for use in concrete, it is alkali resistant, non-absorptive and completely noncorrosive. SINTA™ M protects concrete from stresses which cause cracking while the concrete is most vulnerable during the first 24 hours after placement. SINTA™ M complies with ASTM Designation C1116, Standard Specification for Fiber-Reinforced Concrete and Shotcrete, Type III Synthetic Fiber-Reinforced Concrete or Shotcrete. SINTA™ M is ¾ in. (19 mm) in length.

Product Advantages

  • 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™ M may be used in any application where decreased plastic shrinkage cracking and improved durability are desired. Specifically, such applications 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.

SINTA™ M may be used as an alternative to welded wire fabric, depending on the application. SINTA™ M may not be used as a replacement for structural or post-crack control steel reinforcement. For temperature or shrinkage post-crack control, please consult a GCP Applied Technologies representative regarding our STRUX® synthetic macro fibers.


SINTA™ M uniformly distributes multi-dimensionally through-out the concrete mixture. The extremely high number of fibers in the fresh concrete matrix protects the concrete when its tensile strength is lowest, reducing the formation of plastic shrinkage cracking. This cracking and other internal stresses would otherwise permanently weaken the resulting concrete. The concrete permeability is decreased, while surface characteristics, impact and toughness properties are improved.

Technically advanced production techniques make SINTA™ M a highly durable fiber that is virtually invisible in fresh concrete. This minimizes fiber-reinforced concrete finishing concerns while providing the highest level of crack protection available.

Packaging & Handling

SINTA™ M is available in convenient Concrete-Ready™ Bags which are added, unopened, to the truck drum or central mixer. The specially designed cellulose fiber bags disintegrate and disperse the fibers throughout the mix. SINTA™ M is available in 0.5 lb and 1.0 lb Concrete-Ready Bags in the U.S. and 600 g Concrete-Ready Bags in Canada.


Fibers shall be ¾ in. (19 mm) microfilament polypropylene fibers as supplied by GCP Applied Technologies, 62 Whittemore Ave., Cambridge, MA 02140. One pound (450 grams) of fibers shall contain no less than 50 million individual fibers, 0.5 lb (225 grams) of fibers shall contain no less than 25 million individual fibers. Required dosage rate shall be as specified by the design engineer or architect. SINTA™ M shall be used in strict accordance with the supplier’s recommendations and within time as specified in ASTM C94. The fiber shall comply with ASTM Designation C1116 Type III 4.1.3. Standard ACI 302 procedures for placing, finishing and curing shall be followed when using SINTA™ M.

Typical Properties

Specific gravity 0.91
Absorption None
Modulus of elasticity 500 ksi
Melt point 320°F (160°C)
Ignition point 1094°F (590°C)
Alkali, acid and salt resistance High

Addition Rates

SINTA™ M may be added to concrete at any point during the batching or mixing process. SINTA™ M 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™ M to ensure uniform distribution. The standard range of addition for SINTA™ M is 0.5 to 1.0 lb/yd3 (300 to 600 g/m3) of concrete.

Compatibility with Other Admixtures

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


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 | North America customer service: 1-877-4AD-MIX (1-877-423-6491)

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.

MicroFiber, SINTA™, 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.

© Copyright 2018 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 62 Whittemore Avenue, Cambridge, MA 02140 USA.

In Canada, 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.

Ce document est à jour seulement à la date de la dernière mise à jour indiquée ci-dessous et n'est valide que pour une utilisation au Canada. Il est important que vous consultiez toujours les informations actuellement disponibles sur l'URL ci-dessous pour fournir les informations les plus récentes sur le produit au moment de l'utilisation. Des documents supplémentaires tels que les manuels de l'entrepreneur, les bulletins techniques, les dessins détaillés et les recommandations détaillées ainsi que d'autres documents pertinents sont également disponibles sur Les informations trouvées sur d'autres sites Web ne doivent pas être utilisées, car elles peuvent ne pas être à jour ou applicables aux conditions de votre site et nous déclinons toute responsabilité quant à leur contenu. S'il y a des conflits ou si vous avez besoin de plus d'informations, veuillez contacter le service client de GCP.

Last Updated: 2020-01-16