| HS Code | 536118 |
| Material | 100% virgin polypropylene |
| Fiber Type | Micro monofilament |
| Fiber Length | 1/2 in (12.7 mm) |
| Denier | 6 |
| Specific Gravity | 0.91 |
| Tensile Strength | 40,000 psi (275 MPa) |
| Elastic Modulus | 500,000 psi (3,450 MPa) |
| Melting Point | 320°F (160°C) |
| Alkali Resistance | Excellent |
| Acid And Salt Resistance | Excellent |
| Water Absorption | Nil |
| Fiber Count | 124 million fibers per pound |
| Typical Dosage | 1.0 lb/yd³ (0.6 kg/m³) |
| Compliance | ASTM C1116 Type III |
| Color | Natural |
As an accredited Fibermesh 124 - Micro Monofilament Fiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Fibermesh 124 - Micro Monofilament Fiber is packaged in 20 kg moisture-resistant, tear-resistant paper sacks for convenient handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL loading: Fibermesh 124 Micro Monofilament Fiber, palletized, dry container, evenly distributed, secured, ventilated, with proper labels and documentation. |
| Shipping | Fibermesh 124 – Micro Monofilament Fiber typically ships as non-hazardous, non-regulated general freight. It is packaged in moisture-resistant bags or cartons on shrink-wrapped pallets. Keep dry, avoid punctures, and store away from direct sunlight. No special transport permits, labels, or placards are required. |
| Storage | Store Fibermesh 124 – Micro Monofilament Fiber in a cool, dry, well-ventilated area, away from direct sunlight, moisture, and extreme temperatures. Keep original packaging sealed, pallets off the floor, and protect from contamination by chemicals, oils, or dust. Use first-in, first-out stock rotation. Avoid crushing or tearing bags; handle gently to prevent fiber spillage. Refer to SDS for complete guidance. |
| Shelf Life | Fibermesh 124 Micro Monofilament Fiber: indefinite shelf life if stored dry in original unopened packaging, protected from moisture and sunlight. |
Fibermesh 124 micro monofilament fiber is specified for cast-in-place slab-on-ground concrete where early-age plastic shrinkage and plastic settlement crack control govern finishing performance. The fiber is classified under ASTM C1116/C1116M as a Type III synthetic fiber reinforcement for concrete, and its contribution to plastic-shrinkage crack reduction is evaluated by ASTM C1579/C1579M, which uses a restrained panel geometry under controlled evaporation. When batching for industrial floors placed with a laser screed and vibratory truss screed, the addition ratio is maintained at 0.5 lb/yd³ to 1.5 lb/yd³ (0.3 kg/m³ to 0.9 kg/m³), with a common reference dosage of 1.0 lb/yd³ (0.6 kg/m³) for slabs designed under ACI 302.1R-15. The fiber is introduced into the central-mix plant after coarse aggregate but before final water adjustment, then the batch is mixed at high agitation speed for 70–80 revolutions after fiber discharge. The downstream production process involves placing concrete at a slump of 100–150 mm, striking off with a laser screed, bull-floating, and power-troweling once surface bleed water has evaporated. Terminal products include distribution center floors, freezer or refrigerated warehouse slabs, automotive logistics floors, and light manufacturing slabs where the objective is not structural residual strength but suppression of map cracking and tearing at saw-cut corners. Published field experience indicates that at addition levels above 1.5 kg/m³, hard-trowel finishing can raise micro-filaments to the surface and require additional burnishing; therefore the upper dosage should not be exceeded on burnished floor specifications.
Precast utility vaults produced in steel gang molds under a wet-cast process use Fibermesh 124 micro monofilament fiber primarily to control plastic settlement cracking on vertical outside faces and around knockouts before demolding. The addition rate for this application is normally 0.5 lb/yd³ to 1.0 lb/yd³ (0.3 kg/m³ to 0.6 kg/m³), because higher dosages can interfere with consolidation under external form vibrators and increase surface texture on architectural returns. Compliance in this downstream segment is commonly tied to ASTM C1227 for precast concrete septic tanks, with fiber-reinforced concrete requirements referenced to ASTM C1116/C1116M Type III; when project specifications require a European basis, the fiber supplier should be asked to provide documentation against EN 14889-2:2006. The batching sequence is critical: the bundled fiber is dispersed into a pan or planetary mixer after coarse aggregate and before cement slurry is fully mixed, and the mixing action must continue for 5–7 minutes after fiber addition to avoid clumping in low-slump wet-cast mixes. The wet-cast production process uses a water-cement ratio of 0.40–0.45, external form vibrators or table vibration, and stripping cycles as short as 12–18 hours with accelerated curing. Terminal product types include precast concrete septic tanks, grease interceptors, electrical pull boxes, utility vaults, transformer pads, and pump chambers where early-age microcracking around form-line changes and penetrations is a recurring field defect. Fibermesh 124 does not modify the structural design of these elements; steel reinforcement remains the primary load-resisting mechanism, and the fiber is intended only for plastic-state crack control before concrete develops sufficient strength to resist drying shrinkage induced stress.
Wet-mix shotcrete placed through a 50 mm internal-diameter rubber delivery line demonstrates pressure fluctuations when the green mixture lacks sufficient paste cohesion and fine solids remain unevenly suspended during high-pressure pumping. Fibermesh 124 micro monofilament fiber, dosed at 0.6 kg/m³ to 1.2 kg/m³ (1.0 lb/yd³ to 2.0 lb/yd³), is batched into the wet-mix shotcrete after coarse aggregate and before final water adjustment; the fiber presence reduces free bleed water and improves the homogeneity of fines distribution during piston-pump output. Compliance for shotcrete projects is anchored to ACI 506R-16, ASTM C1436/C1436M, and, in European specifications, EN 14487-1; plastic shrinkage and crack performance are assessed by ASTM C1579/C1579M. The downstream production process involves batching a wet-mix design with a maximum aggregate size of 10 mm, pumping through a piston-type shotcrete pump at pressures normally between 50 bar and 90 bar, and adding set accelerator at the nozzle. The fiber is carried through the delivery line without the need for enlarged nozzles or specialized spraying equipment. Terminal products include tunnel lining, slope stabilization shells, retaining wall facings, rock support douches, and canal lining repairs. Operational boundary: Fibermesh 124 is not a replacement for macro-synthetic or steel fibers when post-crack residual flexural performance is specified under ASTM C1609/C1609M or EN 14487-1 energy absorption classes.
A placement crew running a 65 ft boom pump across a metal-decked mezzanine experiences rapid moisture loss from exposed concrete and differential restraint over the deck flutes. Fibermesh 124 micro monofilament fiber is batched at 0.6 kg/m³ to 0.9 kg/m³ (1.0 lb/yd³ to 1.5 lb/yd³) in the ready-mix truck or central mixer to suppress plastic settlement cracks that appear along the top of the metal deck ribs and at column penetrations. The composite slab mix is usually designed with 3/8 in maximum aggregate size, a slump of 150–180 mm, and a polycarboxylate high-range water reducer; the fiber is added after aggregate to avoid balling inside the truck drum. Compliance references include ASTM C94/C94M for ready-mixed concrete, ASTM C1116/C1116M Type III, and ACI 302.2R for concrete slabs on metal deck. The production sequence is placement by boom pump, grade trimming with a vibratory screed, bull-floating in a direction perpendicular to the deck span, and power-troweling only after bleed water is absent. Terminal products are composite floor decks in mid-rise offices, mezzanine storage platforms, hospital corridors, and parking deck slabs where structural capacity is provided by welded wire fabric or headed studs and the fiber is used solely as a plastic-phase crack control addition. The upper dosage is held at 0.9 kg/m³ because higher levels can alter finishability and result in visible surface fibers on hard-troweled composite slab toppings.
Sulfate exposure conditions combined with plastic shrinkage over cracked substrates create a risk of rapid early-age crack propagation in thin-section overlay repairs. In this segment, Fibermesh 124 micro monofilament fiber is incorporated into the overlay mix at 0.3 kg/m³ to 0.6 kg/m³ (0.5 lb/yd³ to 1.0 lb/yd³), with the lower dosage selected for trowel-applied products and the upper dosage selected for machine-applied bridge deck or pavement overlays. Compliance is based on ASTM C928/C928M for packaged dry-mix repair materials or EN 1504-3 for European structural repair products, and the concrete matrix is designed for sulfate resistance under ASTM C1012/C1012M where relevant. The production process differs from slab construction: bagged or silo-discharged dry-mix repair compounds are mixed in a paddle mixer or continuous mixer with 4–6 L of water per 25 kg bag, depending on the overlay consistency, and the fiber is dispersed during dry blending before water addition. Placement uses a gauge rake, vibrating screed, and steel trowel or broom finish. Terminal product types include sulfate-resistant parking garage ramp overlays, bridge deck wearing courses, wastewater plant containment curbs, and concrete bund repairs where early-age cracking would create preferential sulfate ingress paths. A limitation to record is that the fiber addition does not provide crack bridging or structural reinforcement in overlays under fatigue loading; movement joints and structural repair resins remain outside the scope of this micro-monofilament addition.
Dry-mix silo formulations designed for machine-applied stucco and hand-trowel repair compounds require fiber dispersibility under high-speed plough shear and stable storage without moisture uptake. Fibermesh 124 micro monofilament fiber is incorporated at 0.3 kg/m³ to 0.9 kg/m³ (0.5 lb/yd³ to 1.5 lb/yd³) into cementitious dry-mix products; the dry mixer is charged with aggregates, cement, and pozzolans first, followed by the fiber, and the batch is mixed for 3–5 minutes in a twin-shaft plough mixer to distribute the filaments without opening the fiber bundles prematurely. Compliance in this segment references ASTM C926 for cement plaster application, ASTM C1063 for lathing and furring, and EN 998-1 for rendering and plastering mortar where European conformity is required. The downstream production at the jobsite includes mixing with a high-torque paddle drill or continuous mixer, machine spraying or hand trowel application, and finishing with wood float or acrylic trowel. Terminal products include exterior cement stucco cladding, EIFS base coat formulations, denticular and textured renders, and trowel-grade repair compounds for vertical concrete repair. Because the product is a dry-mix component, storage must be in closed silos or sealed bags at RH < 60% to avoid pre-wetting of the dispersed fiber packages; once wetted, the collated fiber bundles release individual monofilaments under normal mixing shear. The addition rate for trowel-grade repair compounds should not exceed 0.6 kg/m³ when a very smooth steel-trowel finish is specified, as higher dosages can alter the final surface regularity. The polypropylene monofilament is stable in alkaline cement paste but has limited resistance to concentrated oxidizing acids and chlorinated solvents, so these repair compounds are not specified for industrial chemical containment without secondary protection.
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Fibermesh 124 – Micro Monofilament Fiber is a synthetic polypropylene microfiber specified for secondary reinforcement in concrete, mortar, and wet-process shotcrete. The product is supplied as discrete, non-fibrillating monofilament strands with a nominal cut length of 19 mm (0.75 in) and a specific gravity of 0.91. Because the strands are monofilament rather than fibrillated, they do not split into a lattice during mixing; this geometry limits post-crack residual strength contribution compared with macro synthetic fibers and steel fibers. The manufacturer positions the product for control of plastic shrinkage cracking and early-age bleed-water channeling, with typical addition rates from 0.6 kg/m³ to 1.8 kg/m³. In ready-mix operations, the fiber is commonly added to the truck drum after batching at a dosage of 0.9 kg/m³. Published data for this specific configuration is limited, but the manufacturer technical bulletin cites compliance with ASTM C1116/C1116M Type III. The product carries no structural reinforcement function and does not permit reduction of welded-wire mesh, rebar, or macro fiber specified under ACI 318-19 or EN 1992-1-1. The differentiation from other products is therefore based on crack-control timing, prior to final set, rather than on hardened flexural performance.
Plastic shrinkage cracking occurs when the surface evaporation rate exceeds the bleeding rate and capillary tensile stress develops within the first 3–8 h after placement. Micro monofilament fibers with a diameter below 0.1 mm and a population in the tens of millions per kilogram intersect the developing capillary channels and redistribute tensile stress before crack opening stabilizes. The effect is dosage-dependent and mixing-dependent, not a direct function of fiber tensile strength. Under ASTM C1579-21, monofilament polypropylene microfibers added at 0.9–1.8 kg/m³ reduce mean crack width and total crack area relative to plain concrete controls; published data for Fibermesh 124 specifically in this test configuration is limited, but the fiber class shows consistent trends. The presence of the fiber does not alter the thermodynamic boundary condition that plastic shrinkage risk increases once the evaporation-to-bleed ratio approaches unity. Hot-weather placement with air temperature above 32 °C and concrete surface temperature above 35 °C still requires fogging, wind breaks, or evaporation retardants as specified by ACI 305R-20. In tunnel lining and high-surface-area elements, the same cracking mechanism extends to settlement cracking over reinforcing steel; the fibers redistribute plastic settlement but do not eliminate the differential restraint.
Dispersion on a production floor is governed by the addition sequence and mixer energy. In a 9 m³ ready-mix truck drum rotating at 14–18 rpm, a 0.9 kg/m³ dose of 19 mm micro monofilaments is usually distributed within 90–120 s when the fibers are added after the batch water and superplasticizer have been incorporated. Adding the fiber to a dry or low-slump mass below 125 mm creates balling at the drum inlet because the strands cannot pass through the developing paste film. Plant operators therefore dose at the batching plant or at the site after slump adjustment, but before the final revolution count. Central mixers with twin-shaft configurations and batch sizes of 2.0–4.0 m³ require an additional 30–60 s of mixing beyond the time needed for homogeneous plain concrete. At dosages up to 1.2 kg/m³, the fiber does not require a water adjustment; at higher addition rates, batch water may be increased by 2–4 L/m³ only if the target slump is not reached, with an accompanying air-content recheck according to ASTM C231/C231M-17a. The same mixing practice applies when the fiber is used in precast concrete, but a pan mixer with high-shear action will disperse the strands more rapidly than a paddle mixer; this difference is a processing variable, not a product variable.
| Parameter | Fibermesh 124 micro monofilament | Macro synthetic monofilament | Steel fiber |
|---|---|---|---|
| Material | Polypropylene | Polypropylene/polyethylene blend | Low-carbon steel |
| Cut length | 19 mm | 38–54 mm | 35–60 mm |
| Nominal dosage | 0.6–1.8 kg/m³ | 3.0–7.0 kg/m³ | 20–60 kg/m³ |
| Specific gravity | 0.91 | 0.90–0.95 | 7.85 |
| Primary function | Plastic shrinkage crack suppression | Post-crack residual flexural capacity | Structural crack bridging and ductility |
| Reference test | ASTM C1579-21, ASTM C1116/C1116M | ASTM C1609/C1609M-19a, EN 14889-2 | ASTM C1609/C1609M-19a, EN 14889-1 |
At dosages up to 0.9 kg/m³, the slump loss attributable to 19 mm polypropylene monofilaments in a conventional 0.45 water-cement ratio mix is generally 5–15 mm; at 1.8 kg/m³, the loss may reach 25 mm and should be offset by the superplasticizer dose, not by adding excess water beyond target water-cement ratio. Rheology measurements on a coaxial cylinder rheometer indicate that plastic viscosity rises with fiber count, while yield stress remains within ±10% of the plain concrete baseline if the fibers are fully dispersed. Fibrillated polypropylene fibers at the same dosage tend to produce a greater viscosity increase because their branched structure entrains more paste; monofilament geometry therefore offers a narrower processing window for slump and finishability but lower viscosity penalty. In pump placement, microfibers reduce bleeding and block the upward migration of bleed water, which can improve pump line lubrication at pumping pressures below 50 bar. If the boom pump line diameter is below 100 mm or the vertical rise exceeds 40 m, the reduction in bleed water can produce a drier interface at the pipe wall, increasing pumping pressure by 5–10% compared with plain concrete using the same mix design. This observation is a field-scale processing boundary and should be confirmed with a trial pump before full placement. The product does not generate measurable air entrainment; air content must be managed independently with an approved air-entraining admixture and verified by ASTM C231/C231M-17a when exposed to freeze-thaw cycles.
When flatwork is finished with ride-on trowels, 19 mm monofilaments at 0.9 kg/m³ do not generally require a change in trowel blade angle, but fibers can protrude if finishing is delayed until the surface has closed prematurely. Finishers on exposed industrial slabs specify a burnished finish only after the first trowel pass has cut the surface fibers beneath the paste film. In wet-batch shotcrete, the same fibers are introduced with the sand-cement slurry before the nozzle; the fiber length-to-nozzle-diameter ratio remains below 1.0 in a 50 mm nozzle tip, preventing plugging. Rebound at 0.9 kg/m³ is not significantly different from plain shotcrete, but the operator should maintain an air ring pressure of 5–7 bar to preserve stream cohesion. No published laboratory rebound values for Fibermesh 124 are available; field data are limited to comparative trials between plain and fiber-reinforced shotcrete. When used in architectural precast facings, the monofilament may be visible at the stripped surface if the form is overvibrated; acid etching or sandblasting after 24 h can expose the fiber, which is not an inherent performance defect but must be specified if the aesthetic requires no fiber at the surface.
Fibermesh 124 does not generate a minimum post-crack residual strength measured by ASTM C1609/C1609M-19a or EN 14651. It is not a substitute for macro synthetic fiber classes such as EN 14889-2 Class II or for steel fibers meeting EN 14889-1 Class A in suspended slabs or ground-supported slabs requiring finite element justification. In structural applications, flexural toughness indices from ASTM C1018 or equivalent are near the plain concrete baseline because the fibers are too short and too flexible to bridge cracks exceeding 0.2 mm. For this reason, design engineers remove any specified shear studs, rebar, or wire mesh only after reanalysis of the uncracked section under ACI 544.4R design assumptions. The product is limited to early-age crack-width reduction and does not increase long-term drying shrinkage resistance, sulfate resistance, or freeze-thaw durability of hardened concrete. A separate air-entraining admixture remains mandatory for exterior flatwork in freeze-thaw exposure classes F2 or XF2 per ISO 12439 and EN 206. In floor hardeners and toppings, the fiber should not be added to a mix where the maximum aggregate size exceeds 10 mm because the microfilament may segregate around coarse aggregate and reduce surface uniformity; published data for this specific configuration is limited.
| Document or property | Reference designation | Typical position |
|---|---|---|
| Synthetic microfiber specification | ASTM C1116/C1116M Type III | Complies as a Type III synthetic fiber |
| Plastic shrinkage cracking test | ASTM C1579-21 | Suitable for comparative evaluation; product-specific data limited |
| Fiber length and material | Manufacturer data sheet | 19 mm polypropylene monofilament |
| Ready-mixed concrete | ASTM C94/C94M-21 | Fiber addition does not alter batching tolerances when added at plant |
| Shotcrete | ACI 506R | Wet-process use; preconstruction trials advised |
| Structural design | ACI 318-19, EN 1992-1-1 | No structural reinforcement substitution permitted |
| Durability freeze-thaw | ASTM C666/C666M-15, EN 206 exposure classes | Air entrainment still required |
| Industrial hygiene | REACH, local dust-limit regulations | Not classified as hazardous; dust control required |
Storage in opened paper bags under relative humidity above 60% can soften the bag liner and make pneumatic transfer into the silo inaccurate; the fibers themselves are hydrophobic and do not absorb measurable moisture. During high-shear mixing, localized frictional heat above 120 °C should be avoided because polypropylene softens near 160 °C and can form elongated agglomerates on mixer blades. If the concrete is heated with steam in cold weather, the fiber should be introduced after the aggregate and water have equilibrated below 60 °C to prevent heat-induced fiber deformation. Operator exposure to airborne fiber dust should be controlled with a standard particulate filter mask, even though the product is not classified as a hazardous material under REACH. In combination with silica fume, limestone fines, or viscosity-modifying admixtures, published incompatibility data specific to Fibermesh 124 are limited, but trial batching is required above 1.2 kg/m³ because the combined fine-particle demand can reduce slump more steeply than the fiber contribution alone. The product may be used with polycarboxylate ether superplasticizers, but the superplasticizer should not be sprayed directly onto a dry fiber mass because local surfactant concentration can delay dispersion.
