| HS Code | 233252 |
| Productname | MasterFiber 142 |
| Fibermaterial | 100% virgin polypropylene |
| Fibertype | Macro synthetic |
| Length | 54 mm |
| Diameter | 0.83 mm |
| Aspectratio | 65 |
| Density | 0.91 g/cm³ |
| Tensilestrength | 600 MPa |
| Elasticmodulus | 9 GPa |
| Meltingpoint | 160 °C |
| Ignitionpoint | 590 °C |
| Alkaliresistance | Excellent |
| Waterabsorption | Nil |
| Dosagerate | 3-9 kg/m³ |
| Packaging | 5 kg bags |
| Color | Gray |
| Shelflife | Indefinite |
| Standards | ASTM C1116 Type III; EN 14889-2 Class II |
| Storage | Store in dry conditions, protect from UV |
As an accredited MasterFiber 142 - Macro Polypropylene Fiber for Sprayed and Cast Concrete factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MasterFiber 142 is packaged in 5 lb (2.27 kg) polyethylene bags, suitable for direct addition to concrete mixes. |
| Container Loading (20′ FCL) | A 20′ FCL uniformly loaded with palletized MasterFiber 142 macro polypropylene fibers for concrete, securely shrink-wrapped and strapped for export. |
| Shipping | MasterFiber 142 ships as non-hazardous general freight in sealed, moisture-resistant bags or bulk sacks, palletized and securely wrapped. Store dry, out of direct sunlight, and away from ignition sources. Handle to minimize dust and follow the SDS. No special DOT placarding is typically required. Transport in covered vehicles. |
| Storage | Store MasterFiber 142 in a cool, dry, well-ventilated area, away from direct sunlight, heat, sparks, and open flames. Keep original bags tightly closed, palletized, and off the ground to prevent moisture and contamination. Avoid excessive dust and physical damage. Do not stack excessively. Use FIFO. Shelf life typically 24 months when stored properly. |
| Shelf Life | Shelf life is typically 24 months from manufacture when properly stored dry, in original unopened packaging, away from direct sunlight. |
In NATM primary support, wet-mix sprayed concrete is placed immediately after face advance in tunnel headings. MasterFiber 142 is batched into the mix at 4.0–6.0 kg/m³ to provide post-crack residual flexural capacity in the temporary lining. The dosage is adjusted upward within that range when the project specifies energy absorption measured on square panels under EN 14488-5:2006 at a central deflection of 25 mm. A mix design with 400–450 kg/m³ CEM I 42.5 N, 20–30 kg/m³ silica fume, a 0.40–0.45 water-cement ratio, and 8 mm maximum aggregate is typical. The slump at the pump hopper is maintained at 160–180 mm according to EN 12350-2:2019.
Fibre addition is performed at the batching plant through a belt-dosing station or a bulk-bag splitting frame mounted above the aggregate conveyor. A twin-shaft compulsory mixer receives the full aggregate fraction before cement and water are added. Mixing is extended for 60–90 s after the last fibre package enters the mixer. At the pump, a double-piston shotcrete machine with an S-valve and DN 50–DN 65 mm delivery line is used. Alkali-free accelerator is injected at the nozzle at 4–8% by mass of cement. The nozzle is held at 0.6–1.2 m from the substrate. Layer thickness per pass is limited to 50–100 mm to prevent sloughing. Rebound is collected and tested for fibre content by EN 14488-7:2006 where specified. In production, fibre balling is controlled by limiting bag-dosing surge and by visual inspection of the spray stream. Published data for the exact relationship between dosage and energy absorption for this specific product is limited; site trial panels are required.
Slope stabilization sprayed concrete in soil nail and rock bolt applications specifies macro polypropylene fibre at 3.0–5.0 kg/m³ for temporary and permanent facing layers. The fibre substitutes for A142 or A193 welded wire mesh on irregular rock faces where mesh standoff distance cannot be held constant. Mixing uses a mobile batching unit with 10 mm maximum aggregate and a 150–180 mm slump at the nozzle. Cement content is typically 380–420 kg/m³. The spray operator applies the material in 75–100 mm passes to a total design thickness of 100–150 mm. Because the fibre is not a replacement for rock bolts, the ground-support pattern remains unchanged. Fibre content verification is performed on fresh sprayed concrete samples under EN 14488-7:2006. The hardened facing is assessed for core compressive strength according to EN 12504-1:2019 and EN 12390-3:2019. Layer thickness is verified under EN 14488-6:2006. On steep cuts, the fibre is added to the aggregate skip before cementitious materials. High ambient temperatures above 35 °C require retarders and a maximum transport time of 90 min. Finished facings are covered with polyethylene sheeting for 7 days. Random cracks under restrained shrinkage are measured by visual survey; if crack width exceeds 0.30 mm, the dosage is increased within the specified range and a trial panel is re-tested.
The controlling parameter in high-slump cast floors is not fibre length alone but the interaction between aggregate volume fraction, paste viscosity, and shear history in the mixer and pump circuit. For ground-supported industrial slabs, MasterFiber 142 is incorporated at 2.5–4.5 kg/m³ in concrete with a 120–160 mm slump and 14–20 mm maximum aggregate. A high-range water reducer conforming to EN 934-2:2009 is used to maintain workability without raising the free water-cement ratio above 0.50. The slab design is governed by ACI 360R-10 and ACI 302.1R-15. Fibre distribution in production is verified by bag count, weigh-system calibration, and post-batch visual inspection of mixer discharge. Placement uses a laser screed for initial strike-off and a power trowel for the final surface. The first power float is begun when a footprint depth of 2–4 mm remains. Fibres visible at the surface are pressed below the closed surface during final pan trowel passes. Saw-cut contraction joints are opened within 8–24 h after finishing. Joint spacing is designed using ACI 360R-10 and is typically 6–8 m for slabs with macro fibre at 4.0 kg/m³. Hardened flexural performance is evaluated by ASTM C1399/C1399M-10 for average residual strength and by ASTM C1550-20 where round panel toughness is specified. A trial slab is required before production because residual strength depends on aggregate shape, paste volume, and finishing temperature. Published data for this specific product in high-slump slabs is limited to manufacturer technical bulletins and project trials.
| Application | Typical dosage | Primary test standard | Acceptance parameter | Process constraint |
|---|---|---|---|---|
| NATM primary shotcrete | 4.0–6.0 kg/m³ | EN 14488-5:2006 | energy absorption at 25 mm | max aggregate 8 mm |
| Slope stabilization sprayed concrete | 3.0–5.0 kg/m³ | EN 14488-7:2006 | fibre content | layer thickness 75–100 mm |
| Industrial ground slab | 2.5–4.5 kg/m³ | ASTM C1399/C1399M-10 | average residual strength | slump 120–160 mm |
| Precast wet-cast | 2.5–4.0 kg/m³ | EN 14889-2:2006 | fibre class II conformity | mixing extension 45–60 s |
| Repair shotcrete | 2.0–4.0 kg/m³ | EN 14651:2005+A1:2007 | residual flexural strength | first pass 25–40 mm |
| Composite metal deck slab | 2.0–3.5 kg/m³ | ASTM C1399/C1399M-10 | average residual strength | max aggregate 10 mm |
| Hydraulic structure | 3.0–5.0 kg/m³ | EN 14651:2005+A1:2007 | residual flexural strength | slump 80–120 mm |
Precast concrete operations using accelerated curing and multiple reuse of steel moulds integrate MasterFiber 142 at 2.5–4.0 kg/m³ for non-structural ductility and handling toughness. Wet-cast products such as drainage channels, cable pits, retaining wall panels, and culvert units are mixed in a planetary pan mixer. Fibres are fed through a vibrating hopper into the aggregate weigh skip. The mix is adjusted to a S4 consistency under EN 12350-2:2019 or a 150–180 mm slump. After fibre addition, the mixing time is extended by 45–60 s. The use of external vibrators at high frequency above 50 Hz does not require modification. Demoulding time is governed by concrete strength reaching 10–12 MPa under EN 12390-3:2019; the fibre does not delay cement hydration. Edge spalling during stripping is reduced because the discrete fibres bridge shrinkage cracks. The fibre’s polypropylene chemistry provides chloride ion resistance and does not require passivation. It is not intended to replace load-bearing steel or prestressing tendons. Handling stresses are checked by a lifting insert pullout test and visual crack survey. Factory production control under EN 14889-2:2006 requires the fibre supplier to declare geometry, tensile strength, elastic modulus, and alkali resistance. Compliance to ASTM C1116/C1116M-10a Type III synthetic fibre-reinforced concrete is specified for North American projects. When fire spalling resistance is required, the macro fibre is supplemented with micro monofilament polypropylene fibre at 1.0–2.0 kg/m³; published data for MasterFiber 142 as a fire spalling agent is limited.
In wet-process repair profiles, macro polypropylene fibre is substituted for welded wire mesh on overhead and vertical surfaces where mesh fixing creates rebound shadow voids. The mix is designed with 400–450 kg/m³ CEM I or CEM II, 25–35 kg/m³ silica fume, 4–8 mm maximum aggregate, and 2.0–4.0 kg/m³ MasterFiber 142. The water-cement ratio is held between 0.38 and 0.42. A high-range water reducer conforming to EN 934-2:2009 is used. The prepared substrate is scarified to a minimum surface profile of CSP 7 according to ICRI Guideline No. 310.2R-2013. A cementitious bonding layer is applied before spraying the first layer. The first spray pass is limited to 25–40 mm. Subsequent passes are applied after the previous layer has reached initial set. Alkali-free accelerator dosage at the nozzle is kept below 8% by mass of cement to avoid reducing long-term strength. Curing is by moist burlap and polyethylene sheeting for 7 days. Hardened performance is evaluated by EN 1504-3:2005 when the fibre-reinforced mix is specified as a structural repair material, but published data for MasterFiber 142 in R4 class repair mortar is limited. For fibre-reinforced repair concrete, the residual flexural strength is measured by EN 14651:2005+A1:2007. Compatibility with set-retarding admixtures containing hydroxycarboxylic acids is confirmed by trial mixing. Avoid combination with amine-based bond coats that release free ammonia in contact with fresh cement.
Composite steel deck floor construction with cast-in-place concrete utilises macro polypropylene fibre at 2.0–3.5 kg/m³ to control early-age shrinkage cracking along beams and stud zones. The concrete is specified at 25–35 MPa cylinder strength. Maximum aggregate size is 10 mm for slabs over steel deck. The slump is 150–180 mm. The mix is pumped through a truck-mounted boom pump; fibre addition occurs at the batch plant to avoid manual dumping into the pump hopper. The floor is struck off with a vibrating screed and finished with a power trowel. Stud zone cracking is inspected after 24 h. Crack widths are mapped; if cracks exceed 0.30 mm, a project trial with increased fibre dosage within the stated range is conducted.
Macro polypropylene fibre does not replace primary steel reinforcement in composite slabs. The steel deck acts as permanent formwork and tensile reinforcement at the ultimate limit state. The fibre contributes only to shrinkage crack distribution and early-age spalling resistance. Deflection and vibration are controlled by the steel beam and deck system under EN 1994-1-1:2005. Fire resistance of the floor assembly is governed by ASTM E119-22 or EN 13501-2:2016. Macro polypropylene fusible channels may reduce pore pressure, but the primary spalling-control fibre is micro monofilament polypropylene at 1.0–2.0 kg/m³. Published data for MasterFiber 142 as a standalone spalling-control fibre in composite deck fires is limited.
When hydraulic structures are cast with fibre-only reinforcement, the mix design is adjusted for slipform placement and long-term water contact. Irrigation canal linings, stormwater culverts, and wastewater contact chambers use MasterFiber 142 at 3.0–5.0 kg/m³. The concrete has a 0.45–0.50 water-cement ratio, 280–320 kg/m³ cementitious content, and 19 mm maximum aggregate. The slump is kept at 80–120 mm for slipform paving. A vibratory screed or slipform paver compacts the concrete without over-vibrating, which would force the fibres to the surface. The surface is closed with a bull float and a steel trowel. Liquid curing compound conforming to ASTM C309-19 is applied at 0.2 L/m².
Because the fibre is polypropylene, no corrosion of reinforcement is expected in chloride-bearing wastewater. Abrasion resistance is assessed by ASTM C418-20 where sandblast abrasion is specified. Hydraulic permeability is measured by EN 12390-8:2019. The structural design does not rely on the fibre for primary flexural capacity unless a fibre-only design is explicitly justified by testing under EN 14651:2005+A1:2007. Published data for high-velocity flow above 6 m/s over this specific fibre-reinforced concrete is limited. Construction joints are spaced by the slab design and sealed with waterstops; the fibre does not replace waterstops or joint sealants.
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Designation: MasterFiber 142 is a macro-synthetic structural fiber composed of polypropylene and intended for distribution in sprayed concrete and cast concrete. The product is specified where post-crack residual strength, reduced reinforcement congestion, and removal of corrosion-prone secondary reinforcement are required. Published technical data for the fiber identify a nominal length of 54 mm, a specific gravity of 0.91 g/cm³, and a macro-monofilament geometry. The product is classified under ASTM C1116/C1116M as a Type III synthetic fiber and under EN 14889-2:2006 as a Class II macro-synthetic fiber. Dosage rates span 3–9 kg/m³. The lower band is generally associated with plastic-shrinkage crack control; the upper band is specified where post-crack residual capacity replaces conventional wire mesh or steel fiber in shotcrete or cast sections.
Because the base polymer has a density of approximately 0.91 g/cm³, the particle count per kilogram of MasterFiber 142 is substantially higher than an equal mass of steel fiber at 7.85 g/cm³. This difference affects batching sequence, pumpline dynamics, rebound behavior, and the minimum dosage required to achieve a given residual flexural strength.
In wet-mix sprayed concrete, dosing is usually constrained between 4 kg/m³ and 7 kg/m³. At 4 kg/m³, the fiber contributes mainly to green-state crack control and some rebound reduction. At 6 kg/m³ and above, post-crack capacity becomes measurable under EN 14488-5 panel testing or ASTM C1550 round-panel testing. Published data for this specific configuration is limited where the concrete is placed with high-velocity dry-process equipment; however, wet-mix nozzle operators report lower fiber rebound than equivalent steel-fiber mixes because the fiber density approaches that of the cement paste and aggregate.
The nozzle shear history must be controlled. In a wet-mix line, the fiber passes through a piston pump and a high-velocity nozzle. Fiber intermixing occurs at a point of high turbulence. If the bend radius at the pump elbow is smaller than 500 mm, polypropylene macro-monofilaments can form ropes at the reduction piece. Field observations from tunnel linings placed with twin-shaft batching and 40–60 bar hydraulic pumps indicate that blocking is most frequent when the fiber is added before the coarse aggregate has been fully sheared into the mortar fraction. The preferred sequence is aggregate first, then fiber, then cement, then water and admixture, with a mixing time of 60 seconds after all components are charged. Slump measured by EN 12350-2 may decrease by 20–40 mm at 6 kg/m³ compared with the same mix without fiber.
At addition levels above 8 kg/m³, the risk of fiber balling increases sharply. Static steel finishing tools cannot close surface fibers; spray nozzles require a minimum air volume to maintain fiber alignment. No chemical admixture is required to counteract corrosion because the polypropylene chemistry does not undergo chloride attack. However, the fiber does not provide the same initial stiffness as a steel hooked-end fiber; early-age load transfer before matrix cracking remains governed by the concrete mix itself. For sprayed concrete, compressive strength tests alone are insufficient for qualification. Residual flexural response should be measured under ASTM C1609/C1609M fourth-point bending or EN 14651 notched-beam testing, with values reported at crack mouth opening displacement of 0.5 mm and 3.5 mm.
In dry-mix sprayed concrete, the fiber is either pre-blended into the dry mortar or introduced at the nozzle. Equipment bulletins commonly state that the lower density of polypropylene reduces the kinetic energy of rebounding particles. Nozzle angle between 70° and 80° to the substrate reduces fiber rebound compared with lower angles. Air pressure settings of 6–7 bar at the nozzle for wet-mix and 3–4 bar for dry-mix are typical. Published data for this specific configuration is limited; field verification should include a washout test and a rebound tray measurement on the first application panel.
The product is evaluated as a macro fiber because its length exceeds 30 mm and its geometry is designed to bridge cracks after first crack initiation. The following compliance matrix identifies the standard designations and the applicable classification.
| Standard designation | Scope | Product condition |
|---|---|---|
| ASTM C1116/C1116M | Fiber-reinforced concrete | Type III synthetic fiber |
| EN 14889-2:2006 | Fibres for concrete / polymeric fibres | Class II macro-synthetic |
| ACI 544.1R-96 | State-of-the-art report on fiber reinforced concrete | Reference design guidance |
For structural use under EN 14889-2:2006, the manufacturer declares fiber length, equivalent diameter, tensile strength, and alkali resistance. Published values for MasterFiber 142 list a nominal continuous length of 54 mm and a polypropylene base resin; tensile strength is commonly reported at approximately 550 MPa, with an elastic modulus near 4.5 GPa. These values are lower than the modulus of steel fiber but are paired with a much higher fiber count per kilogram. The resulting fiber network is therefore more dependent on crack-width control and fiber pullout than on direct tensile reinforcement. Third-party comparisons should be made using ASTM C1609/C1609M fourth-point bending or EN 14651 notched-beam testing rather than compressive strength alone.
In cast concrete applications, MasterFiber 142 is introduced into slabs-on-ground, precast elements, and tunnel segments. Batching and mixing equipment differs from shotcrete placement. A twin-shaft compulsory mixer with a high-shear mixing zone disperses the 54 mm monofilament better than a drum mixer. The fiber is added after aggregate and before water to prevent floating on the surface of low-slump mixes. The dosage in slab-on-ground applications is frequently specified between 3 kg/m³ and 5 kg/m³, with the heavier dosing used when joint spacing exceeds conventional recommendations. At 3 kg/m³ the material controls plastic settlement and early thermal cracking but does not replace steel bar reinforcement. At 5 kg/m³ it can replace light-gauge welded wire mesh in some non-structural loading conditions, provided the slab design has been checked for joint load transfer.
Handling on production-scale equipment is characterized by two failure modes. In precast plants using a weigh hopper with a knife-gate discharge smaller than 300 mm, the macro-monofilament can form a self-bridging arch above the gate, producing intermittent fiber delivery and batch-to-batch fiber count variation. The condition is observed more frequently when the fiber is added first to a dry aggregate with high surface moisture. In automated bag-splitting systems, the fiber can wrap around rotating blades. A hopper designated for free-flowing granular additions should therefore be specified with a minimum outlet diameter of 300 mm and no internal baffles in the discharge zone.
Quality control for the cast product is usually performed by washout from a fresh concrete sample. A minimum of one washout test per shift is used to verify fiber mass per cubic meter. The washout is compliant with the basic principles in ASTM C1116/C1116M, although the standard does not prescribe a single washout procedure for all production conditions. Fiber count per kilogram should be recorded when the fiber is supplied in pre-weighed degradable bags.
A comparison between MasterFiber 142 and steel hooked-end fiber is not a one-for-one mass substitution. Because polypropylene has a lower density, the mass dosage is roughly one-eighth of the steel dosage for equivalent volume. The typical steel fiber dosage for comparable post-crack resistance may be 20–40 kg/m³, whereas the macro-synthetic dosage may be 3–9 kg/m³. The table below summarizes the relevant comparative parameters.
| Property | MasterFiber 142 | Steel hooked-end fiber | Micro polypropylene fiber |
|---|---|---|---|
| Density | 0.91 g/cm³ | 7.85 g/cm³ | 0.91 g/cm³ |
| Nominal length | 54 mm | 35–60 mm | 6–12 mm |
| Primary function | Post-crack residual capacity | Post-crack residual capacity | Plastic-shrinkage crack control |
| Typical dosage | 3–9 kg/m³ | 20–40 kg/m³ | 0.6–0.9 kg/m³ |
| Corrosion behavior | No chloride-induced corrosion | May corrode at exposed surfaces | No chloride-induced corrosion |
The substitution is justified when exposure to chlorides, acid sulfate soils, or stray currents makes steel fibers vulnerable to surface staining or long-term section loss. In tunnel lining, parking decks, and marine exposure, the non-corroding character of the polypropylene fiber reduces the need for additional cover. However, the elastic modulus difference must be accounted for in design. A steel fiber at 20 kg/m³ may provide a higher immediate post-crack stiffness than MasterFiber 142 at 5 kg/m³, particularly in elements where crack-width control under sustained load is governed by early-age tensile creep. Design calculations should use the residual flexural strength ratio obtained from EN 14651 at CMOD 0.5 mm and 3.5 mm rather than the ultimate tensile strength of the fiber itself.
Unlike micro polypropylene fibers that are added at 0.6–0.9 kg/m³ to suppress plastic shrinkage, MasterFiber 142 is a macro-synthetic fiber. The two products cannot be interchanged for the same purpose without re-evaluating the specified post-crack performance class. The product also differs from other macro-synthetic fibers with embossed or twisted-bundle geometries. Those geometries may achieve a different pullout response at the same fiber length; the 54 mm macro-monofilament in MasterFiber 142 disperses through standard aggregate gradations up to 20 mm maximum size, but batching trials should be performed for aggregate sizes larger than 20 mm.
Limitations: at dosages above 9 kg/m³, the increase in workability loss and balling tendency is not proportional to the increase in post-crack capacity. The fiber is not intended to replace primary structural steel in load-bearing beams, columns, or slabs without design verification. It is not compatible with all high-strength, low-water-cement-ratio mixes unless a polycarboxylate superplasticizer is designed to maintain workability; published data for this specific configuration is limited. The material should not be used as the sole reinforcement in sections subject to punching shear or fatigue reversing loads without specification-specific testing.
