| HS Code | 145088 |
| Material | 100% virgin polypropylene |
| Fiber Type | Monofilament |
| Fiber Length | 12 mm (0.5 in) |
| Fiber Diameter | 0.022 mm (0.0009 in) |
| Specific Gravity | 0.91 |
| Tensile Strength | 310 MPa (45,000 psi) |
| Elastic Modulus | 3,500 MPa (500,000 psi) |
| Melting Point | 160°C (320°F) |
| Ignition Point | 590°C (1,094°F) |
| Alkali Resistance | Excellent |
| Acid Resistance | Excellent |
| Water Absorption | Nil |
| Color | Natural |
| Recommended Dosage | 0.9 kg/m³ (1.5 lb/yd³) |
| Packaging | 0.68 kg (1.5 lb) water-soluble bags |
| Shelf Life | 2 years |
| Standards Compliance | ASTM C1116 Type III; EN 14889-2 Class Ia |
As an accredited MasterFiber M 100 - Monofilament Polypropylene Micro Fiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 0.6 kg water-soluble bags, 20 bags per carton (12 kg total), ready for direct concrete mixing. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): MasterFiber M 100 – Monofilament Polypropylene Micro Fiber, securely palletized and shrink-wrapped for safe ocean transport. |
| Shipping | MasterFiber M 100 is shipped as a non-hazardous, non-regulated solid for road, sea, or air transport. It is packaged in moisture-resistant bags or pails, palletized and shrink-wrapped. No UN number, hazard class, or placards are required. Store dry, away from moisture and ignition sources; handle with normal PPE. |
| Storage | Store MasterFiber M 100 in a cool, dry, well-ventilated area, away from direct sunlight, moisture, and ignition sources. Keep original packaging sealed and pallets off the ground. Protect from extreme temperatures and excessive stacking. Avoid contact with incompatible chemicals. Maintain clean, dust-free conditions. Observe local regulations and manufacturer’s shelf-life guidance; rotate stock first-in, first-out. |
| Shelf Life | Shelf life: 24 months from manufacture if stored in a dry, covered area in original unopened packaging. |
In slab-on-grade placements with exposed surface areas above 1,000 m² and low ambient relative humidity, the addition of polypropylene monofilament micro fiber at 0.6–0.9 kg/m³ is targeted at plastic shrinkage crack suppression during the 0–6 h interval after strike-off. The fiber is batched into the aggregate stream before the cement and water are charged, or introduced into the truck drum at the batch plant after batching. The hydrophobic monofilament surface does not absorb mixing water, so no water adjustment is required when the dosage remains below 1.0 kg/m³. Drum mixers are run for an additional 60–90 s after fiber addition to disperse individual filaments. A typical batch-to-batch control check is the visual absence of fiber balls after the first discharge. Dosage above 1.2 kg/m³ in low-cement-content mixes with a paste volume below 250 L/m³ may increase surface fiber visibility and finishing friction. The hardened concrete is placed with the same saw-cut joint layout as plain concrete unless the project engineer specifies otherwise. The fiber is not a substitute for engineered joint spacing or for structural steel reinforcement. Plastic shrinkage cracking resistance can be evaluated using ASTM C1579-21, but project acceptance is normally based on the absence of visible plastic cracking under the specified evaporation rate. For exterior slabs placed in wind speeds above 20 km/h, the specified dosage is commonly increased within the upper half of the band. The terminal elements include warehouse floor slabs, truck dock aprons, and racking aisles where surface appearance is a warranty item.
The finishing sequence requires no material change at 0.6 kg/m³. At 0.9 kg/m³, power trowel operators may observe a slight increase in paste drag during the final pass, particularly when the surface is timed after bleed water has not fully cleared. Bleed water migration is not obstructed because monofilament polypropylene has a density of approximately 0.91 g/cm³ and remains distributed within the paste rather than forming a continuous barrier. Floating and troweling are performed with conventional magnesium or steel blades. No risk of corrosion exists for embedded fiber ends at the surface. The surface fiber is accepted by floor flatness measurement protocols under ASTM E1155 because the individual filament diameter is below the threshold that interferes with FF/FL readings. The concrete should not be overdosed beyond the tested maximum under ASTM C1116/C1116M Type III specification because plastic viscosity can shift enough to change the timing of finishing.
In a 40 mm bonded cementitious screed formulated for underfloor heating coverage or renovation over concrete substrates, the addition of 0.4–0.8 kg/m³ of monofilament polypropylene micro fiber is specified for microcrack control during forced hydration drying. The dosage is introduced into the dry pre-mix in a horizontal twin-shaft paddle mixer before water is added on site. The fiber disperses in a mixing time of 120–180 s in a forced-action mixer, which is longer than the 90 s used for an equivalent plain screed. The small fiber length relative to the 40 mm layer thickness avoids fiber projection through the finished surface. The governing standards are EN 13813 for screed material performance and EN 14889-2:2006 for the fiber CE mark. The terminal floor layer is routinely specified as CT-C25-F4 according to EN 13813, but the fiber itself contributes no measurable increase in the flexural strength class. The function is limited to plastic shrinkage cracking control during the first 24 h of curing. The wet density of the fresh screed is checked according to EN 1015-6. The fresh mortar spread is measured by the flow table method EN 1015-3. Batch-to-batch variance in flow is controlled by adjusting the water-to-cementitious ratio within the manufacturer’s declared band rather than by changing fiber dosage. This material is not suitable for floating screeds on resilient membranes unless the project’s crack-control requirements are defined separately. The finished component is a leveling layer for ceramic tile, vinyl sheet, or resin coating systems.
The pumpability of the screed at 0.5 kg/m³ fiber addition remains within the operating range of rotor-stator or piston screed pumps with hose diameters from 25–50 mm. Line pressure may increase by 0.2–0.5 bar over an unmodified mix at the same slump, but published data for this specific configuration is limited. Overdosing above 0.8 kg/m³ in a thin bonded screed can produce visible fiber lumps if the dry blending was incomplete. The screed should not be used as a structural wearing surface without a bonded hard aggregate scale. The fiber does not replace a separating or bonded construction detail. Curing with polyethylene sheet or liquid curing compound must begin immediately after finishing because the microfiber does not reduce the water demand of hydration. The operational boundary is relative humidity above 65% during application; below this level, water loss from the 40 mm layer is fast enough that plastic shrinkage cracking can occur even with fiber present.
During demolding of thin precast concrete elements with wall thicknesses between 30 mm and 100 mm, green shrinkage cracks frequently propagate from window openings, conduit penetrations, and reentrant corners where the formwork restrains movement. The precast mix is dosed at 0.5–0.9 kg/m³ of monofilament polypropylene micro fiber in a central batch plant using a planetary counter-current mixer. The addition sequence places the fiber into the aggregate weigh hopper before the cementitious powder is added to avoid fiber clumping. Wet mixing time is extended by 30–45 s after the last raw material addition. The mix design typically carries a water-to-cementitious ratio from 0.35–0.45 and may include polycarboxylate superplasticizer. The fiber does not interfere with the superplasticizer adsorption mechanism. Slump flow retention is not significantly decreased below 0.6 kg/m³ in self-consolidating mixes. The fiber is used to reduce plastic settlement and early drying cracks in non-structural architectural concrete. The terminal components include façade panels, utility vault covers, cable troughs, and ornamental wall caps. Compliance with EN 14889-2:2006 Class II is indicated on the precast production control record. The product is not intended to provide post-cracking residual strength; any measured increase under EN 14651 is below the threshold for structural fiber classification. The demolding window remains governed by the concrete compressive strength specified by the precast engineer, and the fiber does not permit early stripping. Curing is performed by steam at an ambient temperature ramp not exceeding 20 °C/h to avoid thermal cracking.
The surface finish of architectural precast is influenced by the fiber diameter and mixing energy. The monofilament geometry produces minimal visible fiber accumulation at the form face because the fibers are cut to a length that allows finishing with standard troweling or form vibration. External form vibrators operating at frequencies from 50–200 Hz do not separate the fibers from the matrix. In open molds, surface densification with a pencil vibrator should avoid excessive vibration near the form face because the local paste-rich zone may carry visible fiber ends after curing. Sandblasting or acid etching of the hardened surface does not expose appreciable fiber content at dosage below 0.9 kg/m³. The user must confirm color acceptance with a trial panel because the fiber itself is white and may be visible in high-contrast pigments. The operational limit is placed on addition rate rather than on cure temperature. Published data for this specific configuration is limited when the panel thickness is below 30 mm. The process control plan should include a fiber count test on the fresh mix under ASTM C1116/C1116M or an equivalent in-house method.
| Downstream application | Typical addition rate | Relevant standard | Terminal product |
|---|---|---|---|
| Slab-on-grade concrete | 0.6–0.9 kg/m³ | ASTM C1579-21, ASTM C1116/C1116M | Warehouse floor slab |
| Bonded cementitious screed | 0.4–0.8 kg/m³ | EN 13813, EN 14889-2:2006 | Tile and resin floor leveling layer |
| Thin precast elements | 0.5–0.9 kg/m³ | EN 14889-2:2006 | Façade panel, vault cover |
| Wet-mix shotcrete | 0.6–1.0 kg/m³ | ASTM C1436, EN 14487-1 | Soil nail facing, initial tunnel lining |
| Dry-mix repair mortar | 0.2–0.5% by cement weight | EN 1504-3 | Concrete patch, cove detail |
In wet-mix shotcrete for temporary ground support and slope stabilization, the addition of 0.6–1.0 kg/m³ of monofilament polypropylene micro fiber is made at the batching plant before the transit mixer supplies the shotcrete pump. The fiber-loaded mix is conveyed through a piston or rotor pump and sprayed through a nozzle with compressed air. The dosage above 1.0 kg/m³ is not recommended because the accumulated effect on paste viscosity can raise pumping pressure and cause blockages in the 50–65 mm hose when the mix is held beyond 45 min. Rebound at the nozzle is typically assessed visually and by mass difference between the total sprayed material and the in-place layer thickness. The fiber has minimal effect on rebound at 0.7 kg/m³, but an increase in rebound of 2–5 percentage points has been observed in some outdoor placements; published data for this specific configuration is limited. The fresh mix should meet the testing requirements of ASTM C1436 or EN 14487-1 depending on the project specification. The fiber is added for reduction of plastic shrinkage cracking in thick sprayed sections placed without formwork. It is not a replacement for welded wire mesh or steel fibers where flexural toughness is specified. The terminal sprayed elements include soil nail facing, rock slope protection, tunnel initial linings, and temporary excavation support. Set accelerator compatibility must be verified with the accelerator supplier because certain alkali-free accelerators may shift the early spray layer at high fiber dosages. The use of pre-wetting or extra water is not permitted because the fiber is hydrophobic and does not consume water.
The dry components are mixed at the batching plant. The fresh concrete is transported to the nozzle within 30–60 min. At the nozzle, compressed air is introduced at 5–7 bar. The spray operator maintains a nozzle distance of 0.8–1.5 m from the substrate. The in-place density is checked by a nuclear density gauge or by cores. The fiber contributes no known effect to the mechanical performance after cracking; therefore the structural design uses the plain shotcrete compressive strength according to the relevant design code. The fiber is used only for plastic shrinkage control and early-age surface crack reduction. If the project requires early-age crack control under restrained shrinkage, the specifier may require ASTM C1579-21 data. The terminal quality control record should include the fiber batch certificate under EN 14889-2:2006, the shotcrete mix design, and the pump pressure log.
Dry premixed bagged repair mortars are blended with monofilament polypropylene micro fiber at 0.2–0.5% by cement weight to reduce early-age cracking in hand-applied and trowel-applied patches. The fiber is added in a horizontal ribbon blender or a rotating drum mixer after the cement, silica sand, and powdered admixtures have been charged. Blend uniformity is confirmed by taking 3–5 incremental samples from the mixer and counting the fiber content per kilogram of dry mix. The bagged product is then conditioned in moisture-resistant sacks because the polypropylene fiber itself is not hygroscopic, but the cementitious matrix is. Site mixing uses a slow-speed paddle drill at 400–600 rpm with a prescribed water addition of 4–5 L per 25 kg bag. The wet mortar is applied in layers up to 30 mm per pass. The fiber does not alter the need for substrate preparation; a saturated surface dry concrete substrate is required. The terminal products include concrete repair patches, stair nose fills, cove details, and pipe penetration seals. The governing product specification is EN 1504-3 for structural and non-structural repair. The fiber is not a substitute for the polymer modifier or for the contraction joint. The mixed mortar should be placed within 30–45 min of water addition to avoid fiber-matrix separation during stiffening. After application, the patch is cured with a liquid membrane or damp burlap for 7 days.
The modulus of rupture of the repair mortar is dominated by the binder formulation and is not increased by this microfiber class. Batch records should include the fiber addition rate and blend time. The initial fiber addition rate on the low end of the band is used when the repair is subjected to steel trowel finishing, because higher addition rates can produce visible surface fibers in thin feather-edge applications. The upper end of the band is used for deeper patch sections where plastic settlement cracking occurs around embedded reinforcing bars. The operational boundary is the maximum layer thickness and the substrate moisture condition. The fiber is not evaluated for chemical resistance to acids or aggressive sulfates. Compatibility with epoxy-bonded concrete overlays is not affected, but the textile appearance of the surface may require a trial patch. The saturated surface dry condition of the substrate is measured by the absence of surface sheen, not by moisture meter alone. Published data for this specific configuration is limited for patches thinner than 5 mm.
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MasterFiber M 100 is a monofilament polypropylene micro synthetic fiber supplied as discrete cylindrical filaments for concrete and mortar. The M 100 designation identifies a single-filament geometry, not a fibrillated, collated, or twisted bundle. Under ASTM C1116/C1116M-23 the product falls within Type III synthetic fiber classification; under EN 14889-2:2006 it is positioned as a Class Ia polymer micro fiber. Manufacturer-declared nominal geometry consists of 12.7 mm cut length and 0.018 mm equivalent diameter, producing an aspect ratio near 706:1. The solid density is 0.91 g/cm³, the melting point is approximately 160 °C, and water absorption is effectively nil. Tensile strength of the filament is typically 300–400 MPa, with elastic modulus of approximately 3.5 GPa when tested according to ASTM D638-14. At a dosage of 0.9 kg/m³, the arithmetic fiber count is approximately 3.2 × 10⁸ discrete filaments per cubic metre based on nominal geometry. Under a cubic-lattice approximation, that population corresponds to a mean volumetric spacing of roughly 1.5 mm. The fiber is hydrophobic, resistant to alkaline concrete environments, and does not alter free-water-cement ratio through absorption.
Plastic shrinkage cracking initiates when surface evaporation exceeds bleed-water supply, generating capillary tensile stress in the fresh matrix before it has developed adequate tensile strain capacity. MasterFiber M 100 functions as a physical bridging phase during this period. The filaments intersect developing capillary cracks at spatially distributed points, increasing the energy required for crack coalescence and reducing crack width propagation. The controlling variables are fiber count and fiber spacing, not long-term strength or stiffness. In laboratory slab tests conducted under ASTM C1579-21, published evaluations with micro-polypropylene systems at 0.9 kg/m³ commonly report crack area reductions in the 60–80% range relative to plain concrete under forced-air evaporation. The numerical result should not be treated as a fixed material constant; it shifts with paste volume, aggregate absorption, air content, and wind speed. Published independent multi-laboratory data for every exposure configuration is limited, so trial batching under project-specific evaporation rates remains the only reliable predictor of crack-control response.
The mechanism is mechanical rather than chemical. MasterFiber M 100 does not behave as a hydration-control admixture, does not require pre-drying, and does not introduce chloride or sulfate ions. Its low modulus relative to hardened cement paste means the fiber imposes only minor restraint on long-term drying shrinkage. The benefit is concentrated in the 0–24 h period after placement, when the matrix cannot yet carry significant tensile stress. For a fiber count of 3.2 × 10⁸ filaments per cubic metre, the mean spacing falls below 2 mm, which is sufficiently small to intersect many plastic shrinkage cracks that typically open at widths of 0.1–0.5 mm before final set.
MasterFiber M 100 is used primarily in slab-on-ground concrete, composite metal deck slabs, precast panels, tilt-up elements, concrete pipe, and shotcrete linings where early-age surface cracking is a production-critical defect. The starting dosage range is 0.6–0.9 kg/m³ for conventional exposed slabs placed under moderate evaporation conditions. For placements where the evaporation rate exceeds 1.0 kg/m²/h, or where wind, high concrete temperature, and low humidity combine with delayed initial curing, the dosage is often increased to 0.9–1.8 kg/m³. Above 1.8 kg/m³, crack-control benefit usually diminishes while the risk of fiber balling increases, especially in low-paste mixes with less than approximately 260 L/m³ of cement paste. The addition rate must be matched to mixer type, paste content, and aggregate angularity.
Field batching sequence is more important than total mixing energy. In truck-mixer production at drum speeds of 14–18 rpm, the recommended addition point is the aggregate stream or the charged aggregate before water, rather than the discharge hopper or cement weigh hopper. Direct addition into water is discouraged because the hydrophobic surface can produce localized electrostatic clumping. A post-addition wet mixing interval of 5–7 min is commonly specified for ready-mix drum mixers to fully disperse the filaments. In horizontal twin-shaft mixers operating at approximately 25 rpm, fiber can be added after coarse aggregate and mixed for 60–90 s before water addition without measurable clumping at 0.9 kg/m³. Batch-to-batch dispersion should be verified visually rather than assumed from mixer rpm alone.
| Parameter | MasterFiber M 100 | Macro-synthetic PP fiber | Cold-drawn steel fiber |
|---|---|---|---|
| Standard classification | ASTM C1116/C1116M-23 Type III; EN 14889-2:2006 Class Ia | ASTM C1116/C1116M-23 Type III; EN 14889-2:2006 Class II | ASTM A820/A820M-22 |
| Nominal length / diameter | 12.7 mm / 0.018 mm | 40 mm / 0.50 mm | 35 mm / 0.50 mm |
| Specific gravity | 0.91 | 0.90–0.92 | 7.85 |
| Tensile strength | 300–400 MPa | 400–550 MPa | 1,000–1,500 MPa |
| Elastic modulus | 3.5 GPa | 4–10 GPa | 200 GPa |
| Typical dosage | 0.6–0.9 kg/m³ | 3–7 kg/m³ | 20–40 kg/m³ |
| Dominant function | Plastic shrinkage crack reduction | Post-crack flexural toughness | Post-crack structural capacity |
In comparison with macro-synthetic fibers, MasterFiber M 100 is not designed to supply residual flexural strength after the concrete has cracked. The low elastic modulus of polypropylene, approximately 3.5 GPa, is only about 1.75% of structural steel. At dosages below 1.8 kg/m³, residual strength ratios measured under ASTM C1609/C1609M-19 remain negligible at net deflections of L/600 and L/150. Macro-synthetic fibers, by contrast, are longer and stiffer enough to bridge wider cracks and produce measurable post-crack toughness, but they require dosages of 3–7 kg/m³ and can affect workability more substantially. Steel fibers at 20–40 kg/m³ provide structural post-crack capacity and replacement of some conventional reinforcement in ground-supported slabs, but their high density and stiffness change both fresh-state workability and hardened-state shrinkage restraint.
The monofilament geometry also distinguishes MasterFiber M 100 from fibrillated micro-polypropylene products. A monofilament has lower specific surface area per unit mass than an opened fibrillated network, which reduces paste demand and lowers the likelihood of surface fuzz under troweling. Fibrillated fibers may produce finer filament networks after mixing, but they tend to remain visible on hard-troweled surfaces and may require more mixing energy to fully separate. MasterFiber M 100 is therefore selected when surface finish, dispersion consistency, and low dosage are critical while early-age crack reduction is the primary performance target.
MasterFiber M 100 is not a substitute for welded-wire reinforcement, reinforcing bar, or structural macro-synthetic fibers. Its function is limited to control of plastic shrinkage cracking, plastic settlement cracking, and early-age surface distress. For applications requiring post-crack flexural capacity under ASTM C1609/C1609M-19 or EN 14651, the product must be combined with structural reinforcement or a suitable macro-fiber system. Storage should remain dry and below 50 °C, though no pre-drying is required for the fiber itself. Direct flame exposure and sustained temperatures above the 160 °C melt point must be avoided. Published data for this specific configuration under all possible placement conditions is limited; project-specific trial batching is required to confirm dispersion, air content stability, and surface finish at the selected dosage.
