| HS Code | 441209 |
| Product | MasterFiber M 080 |
| Material | Polypropylene |
| Fibertype | Monofilament micro fiber |
| Form | Discrete monofilaments |
| Color | White |
| Length | 6 mm |
| Diameter | 0.020 mm |
| Aspectratio | 300 |
| Specificgravity | 0.91 |
| Tensilestrength | 350 MPa |
| Elasticmodulus | 3500 MPa |
| Meltingpoint | 160 °C |
| Alkaliresistance | Excellent |
| Waterabsorption | Nil |
| Recommendeddosage | 0.6 to 1.8 kg/m³ |
| Packaging | 0.6 kg water-soluble bags |
| Standards | ASTM C1116, EN 14889-2 |
As an accredited MasterFiber M 080 - Monofilament Micro Polypropylene Fiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MasterFiber M 080 comes in 600 g water-soluble bags, usually 20 bags per 12 kg carton. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with palletized MasterFiber M 080 monofilament micro polypropylene fiber, securely stowed and braced for ocean transport. |
| Shipping | Shipping Description: MasterFiber M 080 is a non-hazardous polypropylene fiber supplied in 20 kg moisture-resistant bags on shrink-wrapped pallets. Not regulated for transport; no UN number, hazard class, or placard required. Store dry, keep sealed, avoid moisture, and handle with normal warehouse equipment. |
| Storage | Store MasterFiber M 080 in original, unopened packaging in a cool, dry, well-ventilated area. Keep away from direct sunlight, moisture, excessive heat, open flames, and ignition sources. Place on pallets off the floor; do not stack excessively. Protect bags from tearing. Maintain closed containers, good housekeeping, and first-in, first-out rotation. No special ventilation normally required. |
| Shelf Life | MasterFiber M 080 has a 12-month shelf life from manufacture when stored dry in original unopened packaging, protected from moisture. |
In architectural precast facade elements where the exposed surface-to-volume ratio frequently exceeds 6 m-1 and the concrete is placed at 0.28–0.34 water-to-cementitious ratios with polycarboxylate superplasticizer, MasterFiber M 080 is dry-batched at 0.9 kg/m³ to 1.2 kg/m³ of concrete to control plastic shrinkage cracks before membrane curing becomes effective. The fibre is introduced into the aggregate stream prior to cement addition in a twin-shaft compulsory mixer: a dry-mix interval of 60 s at 18–22 rpm is followed by a wet-mix interval of 120 s, and tempering water is injected only after the monofilaments are distributed across the coarse and fine aggregate surfaces. Compliance is verified under EN 13369 for precast concrete products, EN 14889-2:2006 Class I polymer fibre specifications, and ASTM C1116/C1116M Type III synthetic fibre requirements. Plastic shrinkage crack performance is measured using ASTM C1579 restrained slab testing; acceptance criteria commonly require at least 60% crack area reduction at 0.9 kg/m³ relative to a plain reference mix, though product-specific values must be drawn from the manufacturer’s declaration of performance because cement alkali content and aggregate angularity shift the threshold. MasterFiber M 080 should not be specified as primary structural reinforcement in thin cladding panels; it is incompatible with curing practices that omit ASTM C171 membrane curing because the fibre reduces crack width but does not lower evaporative water loss. The precast units are demoulded after steam curing at 55–65 °C and are placed as architectural cladding panels, sandwich wall skins, and full-depth facade elements in low-rise and mid-rise envelopes.
When MasterFiber M 080 is metered at 1.5 kg/m³ into a wet-mix shotcrete load before accelerator dosing, the monofilament phase reduces plastic settlement and rebound under high-velocity air placement but does not generate post-crack residual flexural strength equivalent to macro polymer or steel fibres. Dry-mix shotcrete production premixes sand, cement, silica fume, and fibre in a pan mixer for 75–90 s; the dry material is then conveyed through a rotary gun at air pressure between 3.5 bar and 5.0 bar, while hydration water is added at the nozzle to maintain an in-place slump of 120–180 mm where a wet-mix piston pump is used. Compliance references include EN 14487-1 for sprayed concrete specification, EN 14889-2:2006 for polymer fibre conformity, ASTM C1436 for shotcrete materials, and ACI 506R for field application practice. Addition ratios remain within 0.9 kg/m³ to 2.0 kg/m³; at 2.0 kg/m³, field records from 50 mm delivery-line shotcrete pumps indicate that pump pressure may rise by 3–7% and accelerator demand may increase by 5–10% to maintain equivalent overhead build thickness, although published data for this specific fibre grade in highly variable underground conditions are limited. The fibre is not a substitute for welded wire mesh or bar reinforcement where ground support requires bending capacity. Terminal outputs include temporary and permanent rock support linings, tunnel shell linings in NATM headings, and slope protection shells placed at 80–200 mm thickness.
The upper dosage boundary for MasterFiber M 080 in exposed industrial slabs is set by trowel finish surface friction rather than plastic shrinkage performance. In ready-mixed concrete placed with a laser screed, the fibre is added at 0.9 kg/m³ to 1.2 kg/m³ through the plant aggregate weigh hopper and mixed in a truck drum at 12 rpm for 5–7 min before discharge; the final drum speed is reduced to 6–8 rpm to limit air slugging. Compliance is governed by ACI 302.1R for floor construction, ACI 360R for slab-on-ground design, ASTM C157 for length change, and ASTM E1155 for floor flatness and levelness measurement. Plastic shrinkage control in slabs exposed to evaporation rates above 0.5 kg/m²/h is evaluated under ASTM C1579; concrete containing 0.9 kg/m³ microfibre typically displays fewer unformed cracks than uncured reference slabs, but joint activation timing must still follow ACI 302.1R because the fibre does not eliminate drying shrinkage. Doses above 1.8 kg/m³ create monofilament fuzzing under high-speed power trowel blades, may depress floor flatness FF values below 40 in ASTM E1155 testing, and increase surface porosity where pan floats are run beyond 90 min after screeding. Terminal products include wide-bay logistics warehouse floors, food and beverage processing slabs, and controlled-temperature manufacturing areas where hard-wheeled forklift traffic governs surface durability.
In calcium aluminate-enhanced self-smoothing underlayment formulations, MasterFiber M 080 is dry-blended at 0.6 kg/m³ to 0.9 kg/m³ of the mixed mortar phase, equivalent to approximately 0.05–0.08% by total dry powder mass for bagged compounds with a fresh density near 2000 kg/m³. The fibre is dispersed through a rotary batch mixer for 180 s at 12 rpm before bag filling; site mixing then uses a forced-action paddle mixer at 400–600 rpm for 2–3 min to maintain monofilament distribution without over-shearing the redispersible polymer powder and defoamer system. Compliance follows EN 13813:2002 for screed material and in-situ wearing surfaces, EN 14889-2:2006 for polymer fibre conformity, and ASTM C1708/C1708M for self-levelling mortars where flow retention is tested. Flow diameter is checked with a 30 mm × 50 mm ring and held at 230–260 mm after 5 min; addition above 1.0 kg/m³ may reduce flow by 10–20 mm and require additional polycarboxylate superplasticizer to restore pumpable consistency. The fibre is chemically inert and does not interfere with calcium aluminate or ordinary Portland cement hydration, but it should not be dispersed with high-speed pin mills above 1500 rpm because mechanical attrition can shear the monofilaments into shorter lengths and reduce crack-bridging efficiency. Terminal products include self-leveling cementitious underlayments over in-floor heating, acoustic levelling compounds, and decorative overlay base coats applied under resilient flooring or polished concrete systems.
Dry-cast manhole production requires moisture contents commonly between 5.5% and 7.0% of total aggregate mass, leaving insufficient free water to carry MasterFiber M 080 unless the fibre is pre-blended with the sand fraction before cement and water contact. The addition ratio is maintained at 0.9 kg/m³ to 1.2 kg/m³; fibre is metered into a planetary counter-current mixer after 10 s of aggregate pre-mixing and before the measured temper water, with total mixing limited to 45–60 s to prevent zero-slump aggregate segregation. Compliance is established under ASTM C478 for precast reinforced concrete manhole sections, ASTM C76 for reinforced concrete culvert and storm drain pipe, EN 1916 for concrete pipes and fittings, and CSA A257 for concrete pipe and maintenance structures where North American municipal specifications apply. The fibre phase improves green-edge integrity during core extraction and demoulding but does not alter the structural steel reinforcement ratios required by the applicable pipe class. Vibration uses external form vibrators operated at 3500–4000 vpm attached to the outer jacket; fibre clumping occurs if aggregate moisture exceeds 2.5% before batching, so cold-weather stockpile management and covered aggregate bays are necessary when plant humidity rises above 60% relative humidity. Terminal outputs include round manhole bases, risers, cone sections, and box culverts used in municipal drainage, stormwater, and sanitary sewer networks.
The spalling mitigation mechanism of MasterFiber M 080 at elevated temperatures depends on the creation of a permeable capillary network after polypropylene melting near 160 °C, which allows water vapour pressure to escape from high-strength matrices with water-to-cementitious ratios below 0.35. In high-strength concrete specified for fire resistance, the fibre is added at 2.0 kg/m³ to 3.0 kg/m³, with the lower limit representing the commonly specified spalling-reduction threshold for C80/95 to C90/105 concretes under EN 1992-1-2 tabulated data where polypropylene fibre addition is recognised as a spalling control measure. Compliance is not product-specific until validated under ISO 834-1, ASTM E119, or the RWS hydrocarbon curve for tunnel linings; published data for this specific fibre grade in hydrocarbon fire configurations are limited, so furnace test panels and permeability measurements after 200–300 °C exposure are required before specification compliance is claimed. During batching, the fibre is added to the aggregate stream in a twin-shaft mixer with a pre-mix of 60 s, and the high dosage may reduce slump by 30–50 mm relative to the same mix without fibre, requiring polycarboxylate superplasticizer adjustment and pumpability verification through EN 12350-5 flow table testing for self-compacting variants. Terminal products include precast tunnel segment linings, fire-resistant high-rise core walls, and precast column covers exposed to hydrocarbon or cellulosic design fires.
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MasterFiber M 080 is a monofilament micro polypropylene fiber supplied as collated, dispersible bundles for concrete, mortar, and screed mixtures. The fiber is manufactured from 100% virgin polypropylene homopolymer with published typical values of 6 mm length, 0.018 mm diameter, 0.91 g/cm³ density, 300 MPa tensile strength, and 3.5 GPa tensile modulus. The melting point is approximately 160 °C. The product is used primarily for control of plastic shrinkage cracking in fresh cementitious matrices at addition rates commonly between 0.6 kg/m³ and 0.9 kg/m³. It is not intended as a replacement for structural reinforcement, macro synthetic fibers, or steel fibers where post-crack residual flexural strength is specified. Because the fiber is hydrophobic, non-corrosive, and chemically inert in the alkaline pore solution of concrete with a pH range of approximately 12.5 to 13.5, it does not increase water absorption in the hardened matrix. The filament count at 0.9 kg/m³ derives from the small diameter and low density; the volumetric fraction occupied by the fiber is approximately 0.099%, corresponding to roughly 6.5 × 108 individual filaments per cubic metre. This high filament count controls early-age microcrack initiation but does not confer significant load-bearing capacity after cracking.
Plastic shrinkage cracking initiates when surface evaporation exceeds the bleeding rate, causing meniscus curvature to increase and capillary pressure to rise in the pore water. The capillary pressure can be expressed through the Young–Laplace relation, where smaller pore radii produce higher tension in the liquid phase. At early hardening stages, the tensile strain capacity of cement paste is often below 0.1%, and micro polypropylene filaments of 0.018 mm diameter increase the local strain capacity of the paste by intercepting microcracking before visible crack coalescence. Under restrained panel testing according to ASTM C1579-21, synthetic micro fibers of equivalent geometry and addition rate have shown crack width reductions of approximately 40% to 60% relative to plain concrete, although product-specific published data for MasterFiber M 080 in this configuration remains limited. The fiber does not reduce evaporation rate and does not substitute for curing, windbreaks, fogging, or evaporation-retarding finishing methods specified in ACI 305R-20.
Addition rates above 1.2 kg/m³ in low-water-content mixes with water–cement ratios below 0.45 may produce measurable slump reduction, typically in the range of 10 mm to 30 mm at 0.9 kg/m³ depending on aggregate grading, cement content, and mixer type. The effect is more pronounced in mixes with low paste volume because the additional surface area of the filaments demands greater paste coverage. Production batching records from ready-mix loads of 9 m³ indicate that adding the fiber after approximately 70% of the batch water is charged reduces visible clumping compared with dry addition onto aggregates, but formal interlaboratory round-robin data for this sequence is limited.
In twin-shaft compulsory mixers rated at 3.0 m³, dry addition to aggregates before water has been observed to produce low-energy collisions that do not reliably open the collated bundles. A mixing interval of 60 s to 90 s after water addition at 18 rpm to 20 rpm is typically sufficient to separate individual filaments when the fiber is fed continuously across the charging conveyor or distributed over the full mixer length. Balling occurs when fiber is discharged as a single mass into a stationary mixer or onto a dry aggregate pile; therefore, the feed should occur in a moving stream and should avoid localized high concentration. In dry-batch truck mixers, fiber may be added at the plant after the aggregates and cement are charged, but before the final portion of mixing water, to allow hydraulic shear to disperse the filaments. High-range water-reducing admixtures complying with ASTM C494/C494M-19 Type F or EN 934-2:2009 may be used to compensate for slump loss, but the admixture and fiber should be introduced in separate addition points to avoid paste viscosity spikes at the point of first contact.MasterFiber M 080 is not a direct substitute for hooked-end steel fiber or structural macro synthetic fiber when the project specification requires flexural toughness, residual strength, or serviceability performance measured under ASTM C1609/C1609M-19a, EN 14651:2005+A1:2007, or AASHTO T 348:2022. At 0.9 kg/m³, the 6 mm filament length is shorter than the critical transfer length required to bridge wide cracks after matrix cracking, so residual load at net deflections of L/600 and L/150 is generally not measurable. Hooked-end steel fibers with lengths of 35 mm to 60 mm, diameters of 0.50 mm to 1.05 mm, and tensile strengths from 1,000 MPa to 1,500 MPa provide post-crack capacity through anchorage and frictional pullout. Macro synthetic fibers with lengths of 40 mm to 60 mm and diameters of 0.50 mm to 1.25 mm similarly contribute post-crack toughness, though their modulus is significantly below steel.
Where MasterFiber M 080 is specified, the design assumption should remain that the fiber influences plastic-state crack control, reduction of settlement cracking, and early-age microcracking, but not structural load-bearing resistance after hardened concrete cracks. In slabs on ground with only shrinkage and temperature movement, this distinction may be acceptable. In structural suspended slabs, tunnel linings, or precast elements requiring crack width control under imposed flexural demand, substitution without re-evaluation of the specified residual strength class is not supported by the available product data.
Differences from fibrillated polypropylene fibers are primarily geometric. Fibrillated fibers are manufactured as expanded film networks that can increase surface area and may require higher mixing energy to separate. Monofilament micro fibers such as MasterFiber M 080 are produced as individual cylindrical filaments with a circular cross-section, which tends to disperse at lower mixing energy and produces a less visible surface texture. Differences from nylon and cellulose micro fibers include lower density, lower water affinity, and higher alkali resistance in polypropylene. The low density of 0.91 g/cm³ affects transport and storage in bulk silo systems, but does not negatively affect finished concrete density or mix design calculations.
| Attribute | Test method or reference | Published typical value |
|---|---|---|
| Fiber length | EN 14889-2:2006, Table 1 | 6 mm |
| Fiber diameter | EN 14889-2:2006, Table 1 | 0.018 mm |
| Density | ISO 1183-1:2019 | 0.91 g/cm³ |
| Tensile strength | ASTM D3822/D3822M-14 | 300 MPa |
| Tensile modulus | ASTM D3822/D3822M-14 | 3.5 GPa |
| Melting point | ISO 3146:2022 | 160 °C |
| CE marking for polymer fibers | EN 14889-2:2006, Annex ZA | Class Ia or Ib subject to manufacturer declaration |
| Parameter | MasterFiber M 080 micro synthetic | Macro synthetic fiber | Hooked-end steel fiber |
|---|---|---|---|
| Length | 6 mm | 40–60 mm | 35–60 mm |
| Diameter | 0.018 mm | 0.50–1.25 mm | 0.50–1.05 mm |
| Density | 0.91 g/cm³ | 0.90–0.95 g/cm³ | 7.85 g/cm³ |
| Tensile strength | 300 MPa | 400–600 MPa | 1,000–1,500 MPa |
| Tensile modulus | 3.5 GPa | 3–10 GPa | 200 GPa |
| Primary function | Plastic shrinkage microcrack suppression | Post-crack toughness and serviceability | Post-crack residual flexural capacity |
The dosage threshold for plastic shrinkage control is matrix-dependent. At water–cement ratios above 0.55, bleeding is generally sufficient to delay capillary pressure development, so a lower addition rate near 0.6 kg/m³ may be adequate. At water–cement ratios below 0.40 and in accelerated-setting mixtures, the required rate may approach 0.9 kg/m³, but the associated workability loss should be measured by a site trial using the exact aggregate source and mixer type. Published data for this product at addition rates above 1.5 kg/m³ is limited, and such rates are generally outside the intended plastic shrinkage control range.
Alkali resistance and surface finishability derive from filament geometry and curing practice. Because the filaments are hydrophobic, they do not absorb mix water and do not produce additional porosity at the interface. The small diameter contributes to low visibility after trowelling, but the fibers can protrude from the surface if finishing is delayed until after initial set. Pan floats or power trowels with blade angles set for standard structural concrete are generally acceptable; however, hard trowelling too early can redistribute surface fibers along the trowel path. Curing compounds complying with ASTM C309-19 or wet curing membranes applied at the specified application rate should remain in place because the fiber does not reduce the evaporation demand of the exposed surface. In freeze–thaw exposure, air-entraining admixtures conforming to ASTM C260/C260M-10a and EN 934-2:2009 remain the primary protection mechanism; MasterFiber M 080 does not replace a correctly entrained air-void system with spacing factor below 0.20 mm as measured by ASTM C457/C457M-16.In precast and shotcrete applications, the fiber may be introduced through weigh batchers or added to the aggregate conveyor before mixing. For dry-mix shotcrete, fiber addition should be completed at the batching plant to avoid segregation in the delivery hose. For wet-mix shotcrete, the fiber can be added at the plant or at the nozzle through a calibrated feeder, but nozzle addition requires verification that local concentration does not exceed the specified rate. The product is supplied in controlled dosage bags or bulk bags that can be opened and discharged into the mixer; moisture exposure during storage should be avoided because condensation can cause the collated bundles to become brittle or difficult to separate, even though the polymer itself does not absorb water.
