| HS Code | 210598 |
| Product Name | MasterFiber MAC S 22 - Macro Synthetic Polypropylene Fiber |
| Material | Polypropylene |
| Fiber Type | Macro synthetic |
| Fiber Length | 54 mm |
| Fiber Diameter | 0.5 mm |
| Aspect Ratio | 108 |
| Tensile Strength | 600 MPa |
| Modulus Of Elasticity | 10 GPa |
| Density | 0.91 g/cm3 |
| Melting Point | 160 C |
| Alkali Resistance | Excellent |
| Water Absorption | Nil |
| Typical Dosage | 3-6 kg/m3 |
| Packaging | 5 kg bags |
| Color | Gray |
| Compliance | ASTM C1116 Type III; EN 14889-2 Class II |
As an accredited MasterFiber MAC S 22 - Macro Synthetic Polypropylene Fiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 1 lb (0.45 kg) water-soluble bags; 40 bags per carton, giving 40 lb (18.1 kg) total. |
| Container Loading (20′ FCL) | 20′ FCL container loading: MasterFiber MAC S 22 macro synthetic polypropylene fiber, palletized, shrink-wrapped, securely stowed for sea transport. |
| Shipping | MasterFiber MAC S 22 ships as a non-hazardous, non-regulated article. It is typically packaged in moisture-resistant bags or cartons on pallets. No UN number, hazard class, or packing group applies. Transport by road, sea, or air as general cargo. Keep dry and avoid punctures or contamination. |
| Storage | Store MasterFiber MAC S 22 in a cool, dry, well-ventilated area using original, sealed packaging. Keep pallets off the floor and away from moisture, direct sunlight, heat, ignition sources, and incompatible materials. Protect bags from punctures, contamination, and dust generation. Follow first-in, first-out stock rotation; shelf life is typically stable when stored correctly. |
| Shelf Life | Shelf life is approximately 24 months when stored in original, unopened packaging under dry, cool, well-ventilated conditions. |
Distribution centres with automated guided vehicles (AGVs) and Very Narrow Aisle (VNA) racking impose back-to-back point loads above 120 kN and require floor flatness controlled to DIN 18202 Table 3 line 4. MasterFiber MAC S 22 is batched into C30/37 industrial floor concrete at 1.8 to 4.0 kg/m³, equivalent to 0.20% to 0.44% by volume at a filament density of 0.91 g/cm³. Fibre conformity is assessed under ASTM C1116/C1116-23 Type III and EN 14889-2:2006; slab design follows ACI 360R-10 and Concrete Society TR34, while post-crack flexural performance is measured by ASTM C1609/C1609M-19a at net deflections of L/600 and L/150. Plastic shrinkage crack reduction is quantified under ASTM C1579/C1579M-21; dosages below 1.8 kg/m³ may not provide consistent crack width reduction in accelerated evaporation testing. In central-mix plants using twin-shaft compulsory mixers with batch capacities between 2.0 m³ and 4.5 m³, the fibre is discharged after aggregate blending but before 60% of mix water, and wet mixing is extended 60 s to 90 s. Plant-level data show that charging the fibre into dry aggregate with fine-fraction moisture above 3% by mass produces filament balling that cannot be reversed by extended mixing. Placement at a slump of 100 mm to 150 mm is carried out with laser-guided screeds and pan floats; finishing is terminated when fibre ends no longer protrude through the bleed-water film, preventing surface fuzz. Saw-cut joint spacing is governed by ACI 360R-10 and is not eliminated by synthetic fibre addition. Terminal products are high-rack logistics slabs, automated storage and retrieval system floors, cross-dock terminals, cold-storage slabs subject to thermal cycling, and mezzanine-level panels where welded wire mesh congestion prevents reliable cover control.
Across sequential excavation method (SEM) tunnel drives in weak rock, wet-mix sprayed concrete with 4.0 to 7.5 kg/m³ MasterFiber MAC S 22 is specified to reach energy absorption classes from E500 to E1000 under EN 14488-5:2006 square-panel tests. The fibre is CE-marked under EN 14889-2:2006, and the sprayed concrete is specified under EN 14487-1:2005. Early-age compressive strength is specified as J2 or J3 under EN 14488-2:2006 for re-entry, and fibre addition does not alter accelerator dosage curves. Alkali-free accelerators dosed at 4% to 8% by mass of binder do not chemically attack the polypropylene filament in the wet-mix line. Field observations from rotor/stator wet-mix pumps with DN 80 delivery lines indicate pressure rises of 0.5 to 1.2 bar relative to plain shotcrete when dosage exceeds 6.0 kg/m³ and reduction elbow radius is smaller than 0.5 m. The fibre is added at the batching plant after sand and cement are premixed for 30 s, never at the nozzle, to prevent balling at final line reductions. Spraying uses nozzle air pressure of 3 to 5 bar and is built in layers of 50 mm to 100 mm; low-density polymer fibre rebound is compensated by an additional 0.5 kg/m³ over laboratory trial dosage. Terminal products are permanent road/rail tunnel linings, temporary crown support in faulted ground, portal walls, and underground station pilot headings.
When precast tunnel segments are manufactured in high-frequency carousel plants for shielded TBM linings, MasterFiber MAC S 22 is metered at 3.0 to 5.0 kg/m³ into self-compacting or soft-plastic concretes with a water-to-cementitious ratio of 0.32 to 0.38. Segment design references residual tensile strength parameters from fib Model Code 2010 rather than the generic provisions of EN 1992-1-1; flexural testing is performed on notched beams under EN 14651:2005+A1:2007, and fibre conformity is checked under EN 14889-2:2006. In forced-action pan mixers with high-speed rotors and batch discharge temperatures between 15°C and 25°C, the fibre is dosed after cement and aggregate premix, and high rotor speed is held for 90 s. If self-compacting concrete is used, slump flow is retained at 650 mm to 750 mm and V-funnel discharge time below 10 s to prevent filament settlement and vertical orientation loss. Mould filling by four-point direct discharge or screw conveyor must avoid flow-induced orientation of filaments along horizontal axes, which creates anisotropic post-crack behaviour. Vibration tables operating at 50 Hz to 70 Hz for 45 s to 90 s are tuned to prevent fibre accumulation near rubber gasket seats. Steam curing is capped at 60°C to 70°C for Portland cement mixes to avoid delayed ettringite formation; polypropylene remains dimensionally stable below the onset of melting, but prolonged exposure above 80°C may alter creep response. Terminal products are TBM segment rings, shaft lining rings, jacking pipes, and cut-and-cover transition beam segments.
Breakwater and revetment construction in chloride-exposed marine zones requires C40/50 concrete containing 4.5 to 6.0 kg/m³ MasterFiber MAC S 22. Exposure classes are assigned as XS2/XS3 under EN 206:2013+A2:2021, and coastal concrete design guidance follows ACI 357.3R-14. The fibre conforms to EN 14889-2:2006; toughness verification uses ASTM C1550-20 or EN 14488-5:2006 depending on casting method. In fixed-mould precast production with immersion pencil vibrators, the fibre is introduced in central batching after aggregate moisture is corrected below 4%, and mixing continues for 90 s at high shear to disperse individual filaments. Synthetic fibre does not replace conventional steel reinforcement in slender hydraulic sections but controls early-age plastic shrinkage and increases toughness against wave-borne debris impact. Cover in marine units is set by structural requirements for steel reinforcement rather than by synthetic fibre protection, because the polymer fibre does not corrode. Terminal products are dolosse, antifer cubes, revetment panels, wave walls, breakwater toe elements, and outfall anchor blocks.
Where container yard pavements are slipformed under rubber-tyred gantry cranes with wheel loads exceeding 100 kN per tyre, C30/37 concrete is dosed with 2.5 to 4.0 kg/m³ MasterFiber MAC S 22. Pavement design uses ACI 330R-08 for heavy industrial paving; flexural residual strength is measured by ASTM C1609/C1609M-19a, and fibre conformity is assessed under EN 14889-2:2006. Slipform paver speed is limited to 0.8 to 1.5 m/min and concrete slump to 25 mm to 50 mm because macro filaments align parallel to the paver’s longitudinal vibration trail above 4.0 kg/m³, reducing transverse post-crack performance. The fibre is dosed through automatic sack splitters and vibratory sieves at the batch plant; clumping in the moulder is avoided by keeping aggregate moisture below 4%. Saw-cut joints are placed at 4 m to 6 m intervals. Transverse joint loading is transferred by aggregate interlock and dowels where specified; the fibre does not replace dowel load transfer. Terminal products are container yard blocks, intermodal rail sidings, bus depot hardstands, waste transfer station slabs, and twistlock impact zones around crane paths.
Sublevel cave drawpoint construction places shotcrete containing 4.0 to 6.0 kg/m³ MasterFiber MAC S 22 in 50 mm to 100 mm layers to stabilise fractured rock while preventing steel fibre contamination of downstream ore crushers. Ground support design uses ASTM C1550-20 round determinate panel energy absorption and ACI 506R-16 shotcrete placement; the fibre is CE-marked under EN 14889-2:2006. Robot-mounted manipulators with concrete pumps rated at 50 to 70 m³/h and accelerator dosing at 5% to 8% of binder are typical; early strength for re-entry cycles is checked under EN 14488-2:2006. The fibre is added during batching after cement and aggregate premix; synthetic fibre rebound is higher than steel fibre in hand-held nozzle applications, requiring an additional 0.5 kg/m³. Terminal products are drawpoint brows, ore pass walls, decline intersections, refuge bays, and fibrecrete barricades for pastefill containment.
In biogas and liquid manure containment construction, structural elements are cast with 2.0 to 3.5 kg/m³ MasterFiber MAC S 22 in XA2/XA3 chemical exposure concrete under EN 206:2013+A2:2021. The fibre conforms to EN 14889-2:2006; fixed steel moulds with external form vibrators at 30 Hz to 50 Hz are used to compact low-slump wall mixes without fibre segregation. Synthetic fibre prevents metal fibre staining on digestate tank walls and controls restrained shrinkage cracking at wall-to-slab tie-ins. Terminal products are slurry channel segments, precast digestate tank walls, manure storage pits, and sump liners.
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MasterFiber MAC S 22 is a macro synthetic polypropylene fiber supplied as an embossed monofilament in collated bundles. Manufacturer-reported physical properties include a specific gravity of 0.91, fiber length of 54 mm, diameter of 0.82 mm, aspect ratio of approximately 66, tensile strength in the range of 600 MPa to 650 MPa, and elastic modulus of 9.5 GPa. Water absorption is reported as 0% under standard conditioning. The product is classified as a Class II macro synthetic fiber for structural use under EN 14889-2:2006 and as a Type III synthetic fiber reinforcement under ASTM C1116/C1116M. The primary mechanism is post-crack residual capacity, not plastic shrinkage crack control in the same manner as microsynthetic monofilaments.
The fiber is batched into slabs-on-grade, composite steel deck toppings, precast elements, industrial pavements, and tunnel lining shotcrete. Typical slab-on-ground dosage ranges from 3.0 kg/m³ to 6.0 kg/m³; shotcrete applications are specified at 5.0 kg/m³ to 8.0 kg/m³ where round panel energy absorption governs acceptance. Published data for configurations above 8.0 kg/m³ is limited, and higher addition rates may require aggregate packing and pumpability trials.
Unlike microsynthetic polypropylene fiber, MasterFiber MAC S 22 is not used for plastic-shrinkage crack control through high fiber count alone. Microsynthetic fibers of 12 mm length and 0.032 mm diameter disperse at a high fiber count per kilogram and act primarily during the first 24 h of curing. The macro fiber has a larger diameter and embossed surface, which reduces fiber count per kilogram but provides residual load transfer after the matrix has cracked. In applications requiring both early-age plastic shrinkage control and post-crack structural capacity, microsynthetic fiber is sometimes added at 0.6 kg/m³ to 1.2 kg/m³ in addition to the macro fiber dosage.
Under EN 14651:2012, flexural tensile residual strength of macro synthetic fiber-reinforced concrete is measured on notched beams at constant crack mouth opening displacement. Class II fibers under EN 14889-2:2006 must satisfy residual strength thresholds at CMOD 0.5 mm and CMOD 3.5 mm. MasterFiber MAC S 22, when dosed within the manufacturer’s specified range, permits concrete to satisfy the Class II category; typical published residual flexural strengths for comparable macro polypropylene fibers at CMOD 3.5 mm range from 1.0 MPa to 3.5 MPa, depending on cement content, water-cement ratio, aggregate type, and beam geometry. Exact values for this specific product are matrix-dependent and reported in project-specific qualification testing under ASTM C1609/C1609M or EN 14651.
Because the polypropylene fiber has a lower elastic modulus than steel fiber, post-crack load capacity is attained through frictional pull-out and mechanical anchorage, not through elastic stress transfer. The embossed surface and high aspect ratio increase pull-out resistance per fiber. The fiber is not intended to provide significant pre-crack stiffness; cracked-section behavior is controlled by dosage, fiber count per unit volume, and matrix strength.
The residual strength dosage response is non-linear. At lower dosages below 3.0 kg/m³, the post-crack strength remains close to the unreinforced matrix because fiber spacing is too large to bridge closely spaced microcracks. At dosages above 5.0 kg/m³, a more continuous fiber network forms, and the residual strength increases proportionally with fiber count per unit area of crack surface. Published data for this specific product across all dosage levels is limited; therefore, qualification testing is required for structural design values.
Batching and mixing of MasterFiber MAC S 22 must account for low bulk density and collated bundle dispersion. The fibers are added either to the aggregate conveyor prior to charging or directly into a twin-shaft compulsory mixer after initial wetting. Addition to a fully dry mix is avoided because static charge and low fiber density can cause stratification. Industrial mixing guidance indicates that dispersion uniformity is achieved after 4 min to 5 min of mixing at mixer tip speeds below 3 m/s. High-shear mixing above 3 m/s can deform the embossed surface and reduce mechanical anchorage. At dosages above 7.5 kg/m³, the water demand may increase by 5 L/m³ to 10 L/m³, requiring a high-range water-reducing admixture conforming to ASTM C494/C494M.
For pumped concrete, collated bundles are compatible with concrete boom pumps and trailer pumps using pipelines down to 100 mm. Reductions to 76 mm require verifiable pumpability trials because fiber accumulation at reducing sections has been observed in field placements. Slump loss from fiber addition is generally 10 mm to 30 mm compared with plain concrete at the same free water content. Air content and air-void spacing factor should be verified under ASTM C457 when freeze-thaw durability is specified; published data on the effect of macro synthetic fibers on air void systems is limited.
Slab finishing with power trowels can expose surface fibers after strike-off when dosages exceed 6.0 kg/m³. Field observations on laser-screeded slabs show that the use of a 1.2 m to 1.8 m power trowel with blade angles maintained below 10° minimizes surface fuzzing. Burnished finishes are not recommended when the fiber dosage exceeds 6.0 kg/m³ unless trial panels demonstrate acceptable surface quality under ASTM C779 wear testing.
In dry-process shotcrete, the fiber is conveyed through the gun after batching; in wet-process shotcrete, it is introduced at the transit mixer or pump hopper. Round panel energy absorption under ASTM C1550 serves as the acceptance criterion for tunnel and rock support. Dosage values of 5.0 kg/m³ to 8.0 kg/m³ are specified to achieve energy absorption values above 400 J at 40 mm central deflection, depending on matrix strength and nozzle compaction. Published data for this specific configuration is limited. Rebound in wet-process shotcrete increases with fiber dosage; field data from tunnel lining placements show rebound rates of 10% to 20% by mass at 7.0 kg/m³. Nozzle distance of 1.0 m to 1.5 m and air pressure of 0.5 MPa to 0.7 MPa are used to maintain compaction while limiting fiber rebound and overspray.
Preconstruction spray panels are required for shotcrete process qualification under ASTM C1140. Early-age compressive strength can be influenced by accelerator interaction with the fiber surface; alkali-free accelerators are commonly used, but the accelerator dosage must be confirmed by trial spray panels because fiber addition changes fresh-state yield stress and may alter set-time response. Published data on accelerator compatibility with this specific macro synthetic polypropylene fiber is limited.
Substitution of steel fiber by MasterFiber MAC S 22 is evaluated where chloride ingress, carbonation-induced corrosion, or stray current corrosion is the controlling durability constraint. Unlike drawn steel fiber, the polypropylene fiber does not undergo anodic dissolution and does not form corrosion staining at crack faces. However, the elastic modulus of 9.5 GPa is significantly lower than the 210 GPa of drawn steel fiber. Equivalent post-crack energy absorption therefore requires a fiber dosage approximately 1.5 times to 2.0 times greater by volume than steel fiber. Structural elements requiring high strain-rate impact resistance or fatigue resistance at stress ranges above 0.6 f_R should not be substituted without full-scale beam testing under ASTM C1609/C1609M or EN 14651.
| Parameter | MasterFiber MAC S 22 | Drawn steel fiber | Microsynthetic PP fiber |
|---|---|---|---|
| Specific gravity | 0.91 | 7.85 | 0.91 |
| Tensile strength | 600 MPa to 650 MPa | 1100 MPa to 1500 MPa | 300 MPa to 400 MPa |
| Elastic modulus | 9.5 GPa | 210 GPa | 3 GPa to 4 GPa |
| Length | 54 mm | 60 mm | 12 mm |
| Primary function | Post-crack residual capacity, impact resistance | Post-crack flexural and shear reinforcement | Plastic shrinkage crack control |
The product is not designed as primary reinforcement in moment-critical structural members. It is not a replacement for conventional reinforcing bars where yielding of steel must control crack width and ultimate capacity. The fiber is hydrophobic and does not absorb mix water; pre-drying is not required. Storage should be below 80 °C to prevent deformation of the embossed surface. The product is inert in the alkaline concrete environment, but ultraviolet exposure before placement should be avoided because polypropylene can degrade under prolonged UV radiation. The manufacturer’s technical datasheet does not claim compliance with FDA 21 CFR 177.1520 for food-contact applications.
| Standard or regulation | Declaration or test criterion |
|---|---|
| EN 14889-2:2006 | Class II macro synthetic fiber for structural concrete |
| ASTM C1116/C1116M | Type III synthetic fiber reinforcement |
| ASTM C1399/C1399M | Residual strength of fiber-reinforced concrete beams |
| ASTM C1550 | Shotcrete round panel toughness |
| EN 14651:2012 | Flexural tensile residual strength at defined CMOD |
| ASTM C1579 | Plastic shrinkage cracking evaluation where hybrid fiber systems are assessed |
| REACH | No substance of very high concern declaration indicated in manufacturer technical guidance |
| RoHS | Compliance for heavy metals and brominated flame retardants declared for polymer component |
For marine pile repair or chloride-exposed wharf decks where steel fiber at the concrete surface is excluded, the macro synthetic polypropylene fiber is used in conjunction with conventional reinforcement and qualified under ASTM C1399/C1399M. Full-scale verification is required because published data for this specific configuration is limited.
