Specter™ HP

Specter™ HP

The finest diameter microfiber available, Specter HP is the best option for early age, plastic shrinkage crack prevention.

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Product Description

FABPRO POLYMERS’ SPECTER™ HP Synthetic Micro Fiber is a “Best In Class” new generation of polypropylene microfiber for concrete reinforcement. FABPRO’S unique technology combines ultra thin diameter with high strength, resulting in the highest level of plastic shrinkage crack prevention available. Over a hundred million high tensile and high modulus filaments per yard of SPECTER™ HP create an extremely dense, three-dimensional network in any cementitious application. SPECTER™ HP’s superior ability to reduce early age cracking is accomplished at an engineered dosage rate of only 0.5 lb/yd3. Independent test results have consistently confirmed that 0.5 lb. of SPECTER™ HP consistently produces superior PSCR results as compared with any other monofilament fibers at a typical 1.0 lb/yd3 dosage rate – providing better performance at a significantly reduced in-place cost.

Specter™ HP Fibers are manufactured from 100% virgin homopolymer polypropylene resins, and meet the requirements of ASTM C1116/C1116M “Standard Specification for Fiber-Reinforced Concrete” and the requirements of ICC ES AC32 Sections 3.1.1 for plastic shrinkage reinforcement.

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Product Information SDS Sheet
Features / Properties
Specific Gravity
Melt Point
320°F (160°C)
Ignition Point
1094°F (590°C)
Water Absorption
Acid & Alkali Resistance
Tensile Strength
70 ksi (480 MPa)
0.5” & 0.75”
Modulus of Elasticity
1,230 ksi


SPECTER™ HP Synthetic Micro Fibers are specifically engineered for reducing plastic shrinkage cracking in concrete and mortars. The fibers control cracking caused by plastic shrinkage, plastic settlement, thermal expansion and contraction in concrete. SPECTER™ HP fibers also contribute to reduced water migration, and to increased surface resistance to impacts, abrasion and shattering. The fiber manufacturer must document evidence of compliance with building codes in accordance with ICC-ES AC32, and ASTM C1116/C1116M, Section 4.1.3, Type III. SPECTER™ HP Synthetic Micro Fiber should be specified for use in concrete slabs, precast and shotcrete:

  • To help control bleed water
  • To reduce plastic shrinkage cracking
  • To increase abrasion resistance
  • To improve impact resistance
  • To decrease rebound

FABPRO POLYMERS does not recommend this fiber for use in slabs as a substitute for primary/structural reinforcement.

Guidelines for Use


The recommended dosage for the SPECTER™ HP Synthetic Micro Fiber is 0.5 lb/yd3 (0.3 kg/m3).


SPECTER™ HP Synthetic Micro Fibers are packaged in pre-weighed, ready-to-use, degradable bags which are designed to be introduced at any time before or during mixing of concrete. When using SPECTER™ HP Fibers, please follow standard mixing procedures as specified in ASTM C94/C94M. Standard practices detailed in ACI 302 for placing, finishing and curing concrete should be followed when using SPECTER™ HP Fibers.


SPECTER HP Fibers are available in a variety of packaging options. The typical bag size is 0.5 lbs. Bags are packaged in ultra-durable boxes, palletized and stretch-wrapped with corner boards to prevent damage from shipping and handling.