| HS Code | 326636 |
| Product Name | SikaFiber 255 (MasterFiber 255) |
| Product Type | High Performance Polypropylene Macro Fiber |
| Material | Polypropylene |
| Fiber Type | Macro Synthetic |
| Form | Monofilament |
| Length | 54 mm |
| Equivalent Diameter | 0.55 mm |
| Aspect Ratio | 98 |
| Tensile Strength | 600 MPa |
| Elastic Modulus | 10 GPa |
| Melting Point | 165 °C |
| Density | 0.91 g/cm³ |
| Alkali Resistance | High |
| Water Absorption | Nil |
| Magnetic Properties | Non-magnetic |
| Electrical Conductivity | Low |
| Dosage | 3-9 kg/m³ |
| Packaging | 5 kg bags |
| Shelf Life | 24 months |
| Storage | Dry, protected from UV |
As an accredited SikaFiber 255 (MasterFiber 255) - High Performance Polypropylene Macro Fiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SikaFiber 255 comes in 20 kg moisture-resistant bags, typically supplied 30 bags per pallet (600 kg total). |
| Container Loading (20′ FCL) | SikaFiber 255 (MasterFiber 255) high-performance polypropylene macro fibers loaded in 20′ FCL, palletized, dry, secured for ocean shipment. |
| Shipping | SikaFiber 255 (MasterFiber 255) is non-hazardous and not regulated for transport. It is typically supplied in moisture-resistant bags or water-soluble packaging, cartons, and pallets. Ship via standard freight in dry, clean vehicles at ambient temperature, avoiding moisture, direct sunlight, punctures, and sharp objects. No special UN classification or dangerous-goods paperwork is required. |
| Storage | Store in a cool, dry, well-ventilated area, away from direct sunlight, moisture, heat, and ignition sources. Keep in original unopened packaging, sealed, on pallets off the floor. Avoid excessive stacking and UV exposure. Protect from contamination and physical damage. Maintain stable ambient conditions and observe shelf life. Do not store near strong oxidizers. Follow SDS and local regulations. |
| Shelf Life | Shelf life is typically 24 months from production if stored unopened, dry, and protected from direct sunlight in original packaging. |
Feedstock-scale polypropylene macrofiber addition in ready-mix concrete for ground-supported industrial floor slabs is directed to jointed slab construction where crack-width control and surface tolerance govern acceptance criteria. The SikaFiber 255 (MasterFiber 255) high-performance polypropylene macrofiber is specified under EN 14889-2:2006 Class II for fibre for structural use in concrete, and the fibre contribution is evaluated in flexural beam tests per EN 14651:2005+A1:2007 and ASTM C1609/C1609M-19a, with ASTM C1116/C1116M-10a Type III synthetic macrofibre classification. For slab-on-ground applications designed under ACI 360R-10 and constructed under ASTM C94/C94M-21 ready-mix concrete procedures, addition rates are typically between 3.0 kg/m³ and 5.0 kg/m³; the lower bound is assigned to static storage areas with panel dimensions not exceeding 24 m, while the upper bound is applied to high-rack logistics aisles, automated guided vehicle corridors, and docks where joint count reduction and impact resistance are specified. In a 9 m³ ready-mix truck drum, the macrofibre is introduced after aggregate and cement charging and before water and plasticizer, with mixing speed held between 14 rpm and 18 rpm for not less than 4 minutes post-fibre addition to break fibre bundles and prevent balling. Slump at point of discharge is controlled to 150 mm ± 30 mm per EN 12350-2:2019 and adjusted with polycarboxylate-based high-range water reducer when fibre dosing reaches 5.0 kg/m³. Placement is executed with a laser screed such as a Somero S-485 or S-940, and power trowel finishing is applied in two stages: initial float with pan blades and final steel-trowel pass after bleed-water delay, because premature troweling can drag macrofibres and produce surface protrusion. Terminal concrete types include ground-supported warehouse floor slabs, cross-dock terminal slabs, cold-storage freezer floors with 150 mm to 200 mm thickness, agri-food packhouse floors, and dry goods distribution centres requiring flatness tolerances of F_F 50 / F_L 35 or better. The material does not replace structural steel reinforcement; joint spacing and load-transfer design remain governed by slab design, and published data for fibre-only structural slabs under high-moment forklift loads remains limited.
In precast concrete tunnel segmental linings, polypropylene macrofibre is introduced where early-age shrinkage restraint in carousel-mould production and localized cracking at segment edges reduce durable watertightness. Compliance for precast structural elements rests on EN 13369:2018 common rules for precast concrete products and EN 206:2013+A2:2021 concrete specification, with fibre property conformity established under EN 14889-2:2006 Class II. The product is evaluated for flexural residual strength with EN 14651:2005+A1:2007, while compressive strength verification follows EN 12390-3:2019; ASTM C1116/C1116M-10a Type III is referenced where project specifications are based on North American practice. Addition rates in segmental concretes generally fall between 4.0 kg/m³ and 6.0 kg/m³ when reduced steel reinforcement or edge crack-width control is specified; the 6.0 kg/m³ limit is confirmed through pumpability and vibration trials because higher dosage reduces workability of the low-binder precast mix. Production is carried out in planetary countercurrent mixers of 750 L to 1500 L batch capacity, where the macrofibre is fed after aggregate and cement blending to prevent clumping, followed by 5 minutes high-shear mixing. Concrete is placed into steel segment moulds mounted on a carousel line, compacted by high-frequency external vibrators operating at 50 Hz to 80 Hz, and cured under a steam regime of 50 °C to 70 °C for 6 h to 8 h before demoulding; the curing envelope must comply with EN 13670:2009. The rigid polypropylene macrofibre lowers reinforcement cage congestion in radial joint zones but does not replace hoop reinforcement unless project-specific beam tests provide adequate residual strength data for structural load cases. The larger diameter of this macrofibre precludes sole use as a micro-PP fire-spalling admixture; tunnel fire safety specifications require separate verification under project-specific hydrocarbon curve testing. Terminal components include precast concrete tunnel lining rings for metro and road-bore tunnels, shaft rings, and segmental collars for soft-ground excavation.
When a wet-mix sprayed concrete operation is specified for underground excavation support and slope stabilisation, polymer-based macrofibre is added as a replacement for welded wire mesh at the nozzle-level application stage. The relevant specification framework for sprayed concrete is EN 14487-2:2006 and EN 14488-3:2010, supplemented by ACI 506R-16 and EFNARC 1999 for application testing; the fibre itself remains CE marked under EN 14889-2:2006 Class II. The addition ratio in wet-mix shotcrete typically ranges from 4.0 kg/m³ to 5.5 kg/m³, with the upper value used in permanent support applications where early-age crack control and post-peak toughness are acceptance criteria. The concrete is produced in a mobile batch plant or truck mixer, with fibre added at the plant and mixed for 4 minutes at 16 rpm; site-produced concrete is kept at 180 mm to 220 mm slump measured to EN 12350-2:2019 before accelerator dosing, because both fibre stiffness and accelerator reaction reduce pump line workability. Delivery is through a twin-piston wet-mix shotcrete pump rated at 20 m³/h to 25 m³/h and fitted with 50 mm to 65 mm nozzle tips; compressed air supply of 7 bar to 10 bar is applied at the nozzle, and alkali-free accelerator is dosed at 3% to 7% by mass of binder. The macrofibre length-to-diameter aspect ratio imposes a practical dosage ceiling of 6.0 kg/m³; above this value, nozzle blockages and rebound rates increase, as documented in production logs across infrastructure projects. Terminal outputs include primary support linings in road and hydroelectric tunnels, slope stabilization panels, adit portals, and rehabilitation linings in masonry tunnels.
Precast concrete for drainage pipes, box culverts, and manhole risers is produced with zero-slump, dry-cast concrete where immediate demolding and curing-bed turnover determine productivity. The product line fits EN 1916:2002 for precast concrete pipes and fittings and EN 14889-2:2006 Class II fibre requirements, with testing of finished pipes performed under ASTM C497-20 or EN 1916 Annex methods for load-carrying capacity; ASTM C76-22 is referenced where U.S. standard pipe classifications apply. The macrofibre addition ratio in dry-cast production is lower than in pumped concrete applications, typically between 2.5 kg/m³ and 4.0 kg/m³, because higher doses create excessive stiffness in the low water-to-cement ratio matrix and fibre balling in the vertical discharge concrete mixer. The zero-slump concrete contains 300 kg/m³ to 400 kg/m³ cementitious binder, aggregate up to 10 mm to 12 mm nominal maximum size, and a water-to-cement ratio from 0.30 to 0.40; macrofibre is introduced directly into the aggregate weigh hopper or through a proprietary fibre dosing unit after aggregate charging. Compaction is produced by high-frequency vibro-compaction, with 50 Hz to 70 Hz external or table vibrators applied for 60 seconds to 120 seconds, followed by immediate demolding onto a curing line at 50 °C to 60 °C for 6 h to 8 h. The polypropylene macrofibre contributes to edge chipping reduction during handling of demolded units but is not used to replace steel cage reinforcement in deep covers or high-load culverts. Finished product types include reinforced and unreinforced concrete storm drainage pipes, box culvert segments with spans of 2.0 m and larger, circular manhole riser sections, and catch basin bodies.
On composite steel-framed office and residential projects, concrete toppings on trapezoidal metal decking receive polypropylene macrofibre to control plastic shrinkage and restrained early-age cracking while eliminating welded wire mesh. The concrete deck placement specification follows ACI 302.1R-15 for concrete floor and slab construction and ACI 360R-10 or EN 13670:2009 for execution; fibre conformity is verified under EN 14889-2:2006 Class II, and material performance is tested according to EN 14651:2005+A1:2007 or ASTM C1609/C1609M-19a. Addition rates for metal deck toppings are normally 3.0 kg/m³ to 4.25 kg/m³, chosen to maintain a minimum 200 mm slump flow without exceeding the pump pressure limits of 50 m high-rise trailer pumps and without causing metal deck penetration during screeding. Concrete is supplied with 25 mm to 38 mm maximum aggregate size depending on deck depth and reinforcement clearance; the macrofibre is batched at the central plant, and the mixing sequence is aggregate-fibre-50% water-30% superplasticizer additional water, with high-shear mixing for 5 minutes. Placement is carried out by truck-mounted pump into deck pans, struck off with a laser-guided truss screed, and floated with walk-behind trowels; workers must wait for bleed water to rise before finishing because macrofibre exposure becomes visible after burnishing when finishing occurs too early. The macrofibre is not specified to replace negative moment reinforcement over deck supports unless verified by project-specific structural testing; published data for this specific configuration is limited. Terminal product types include elevated composite slab decks in office towers, residential podium decks, hospital tower floor slabs, and slab-to-deck toppings on terrace structures.
Concrete bases beneath steel and concrete storage tanks, containment bunds, and retaining walls are produced with macrofibre for distributed shrinkage crack control under restrained thermal and hygral movement. The structural design of water-retaining concrete follows EN 1992-3:2006 and execution under EN 13670:2009, with concrete specified to EN 206:2013+A2:2021 exposure classes XC3/XF1; fibre quality is assessed under EN 14889-2:2006 Class II and flexural performance under EN 14651:2005+A1:2007. Typical macrofibre dosages range from 3.5 kg/m³ to 5.0 kg/m³; the lower value is used in mass concrete sections where post-cooling crack widths are limited to 0.20 mm, while the upper value is applied in secondary containment slabs where crack-free construction is required for liquid-tightness prior to coating. The mix is produced in a 9 m³ truck mixer with cement content from 350 kg/m³ to 400 kg/m³, 0.45 to 0.50 water-to-cement ratio, and 25 mm maximum aggregate; fibre is added at the plant and mixed at 15 rpm for 5 minutes. Pouring is conducted with a truck-mounted boom pump or direct chute, struck off with a laser screed, and cured under EN 13670 with 7-day wet hessian or curing compound; early loading is prohibited until compressive strength reaches 70% of the specified 28-day design strength. Fibre contribution is limited to crack-width control and does not substitute for design crack reinforcement unless residual strength values from EN 14651 are used in a design model. Terminal products include tank foundation slabs, secondary containment bund floors, wastewater treatment plant basin bases, and concrete retaining wall foundation plinths.
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SikaFiber 255, previously designated MasterFiber 255, is a high-performance polypropylene macro fiber for cementitious matrices. The product is supplied in collated bundles that disperse into discrete fibers during mixing, with a specific gravity of 0.91 g/cm³, a fiber length of 30 mm, a tensile strength of 600 N/mm², and an elastic modulus of approximately 9,000 N/mm². Conformity is declared under ASTM C1116/C1116M Type III for synthetic fiber-reinforced concrete and under EN 14889-2:2006 Class II for macro synthetic fibers intended for structural concrete. The primary engineering function is post-crack residual strength, flexural toughness, and distributed crack-width control in slabs, shotcrete, precast elements, and composite metal deck placements.
At a dosage of 5.0 kg/m³, the fiber volume fraction is approximately 0.55 vol%, calculated from the specific gravity of 0.91 g/cm³. This volume fraction is comparable to that produced by approximately 40 kg/m³ of steel fiber, but the mass addition is far lower. Fiber distribution and mixing energy therefore become the controlling variables rather than material weight. The polymer is chemically inert in cementitious pore solutions with pH above 12.5, and the melting point of approximately 162 °C imposes no restriction under normal concrete curing temperatures.
Post-crack performance is quantified in laboratory flexural testing according to ASTM C1399/C1399M and ASTM C1609/C1609M, where residual load is recorded at specified crack mouth opening displacements. A macro fiber such as SikaFiber 255 bridges crack faces after first cracking and transfers tensile stress through frictional anchorage along the fiber length. The 30 mm length and formulated surface anchorage provide the mechanical interlock necessary for residual flexural tensile strength. In contrast, a polypropylene microfiber typically dosed at 0.6–1.5 kg/m³ suppresses plastic shrinkage cracking by controlling bleed water channels and early crack initiation, but its length and dosage are insufficient to maintain post-crack capacity under structural load. SikaFiber 255 is therefore specified at addition rates from 3.0 kg/m³ to 9.0 kg/m³. At those dosages, the fiber volume fraction is designed to intersect crack planes in multiple orientations, although the exact count depends on aggregate gradation, placement method, and compaction energy.
No single dosage satisfies all element types. For slab-on-grade applications where the fiber is intended to replace light-gauge wire mesh, 3.0–4.5 kg/m³ is commonly evaluated. Composite metal deck slabs often require 4.0–6.0 kg/m³ when verified by ASTM C1399 residual strength specimens. Precast panels, tunnel segments, and wet-mix shotcrete may use 5.0–9.0 kg/m³ when post-crack flexural tensile strength is confirmed by EN 14651. The relationship between dosage and residual strength is not linear: above approximately 9.0 kg/m³, workability loss, mixing torque increases, and fiber balling can outweigh incremental toughness gains unless mix proportioning is adjusted with polycarboxylate-based high-range water reducers and optimized aggregate surface area.
Replacement of welded wire mesh or light-gauge steel mesh with SikaFiber 255 is appropriate only when the slab design accounts for joint spacing, base friction, and post-crack load transfer. In uniformly loaded internal slabs with joint spacing not exceeding 4.5 m, dosage levels of 3.0–4.5 kg/m³ are commonly assessed against ASTM C1399/C1399M residual strength requirements. The material does not corrode in chloride-containing or carbonated concrete environments, and its 0.91 g/cm³ specific gravity eliminates the placement and finishability complications associated with steel fibers that can protrude from the surface. SikaFiber 255 is not a substitute for continuous structural reinforcement in beams, columns, or two-way suspended slabs unless flexural and shear capacity are separately verified under ACI 318-19 or EN 1992-1-1. Published data for this specific configuration is limited for slabs thinner than 100 mm with joint spacing above 6.0 m; field trials should confirm the residual strength class.
| Parameter | SikaFiber 255 | Hooked-end steel fiber | Polypropylene microfiber |
|---|---|---|---|
| Specific gravity | 0.91 g/cm³ | 7.85 g/cm³ | 0.91 g/cm³ |
| Length | 30 mm | 35–60 mm | 6–19 mm |
| Typical dosage | 3.0–9.0 kg/m³ | 20–40 kg/m³ | 0.6–1.5 kg/m³ |
| Primary function | Post-crack residual strength | Structural crack-width control | Plastic shrinkage reduction |
| Corrosion potential | None | Possible at surface | None |
| Reference standard | ASTM C1116/C1116M Type III; EN 14889-2 Class II | ASTM A820/A820M | ASTM C1116/C1116M Type III |
Plant-scale batching of SikaFiber 255 on twin-shaft compulsory mixers with batch sizes from 0.5 m³ to 3.0 m³ typically introduces the fibers with the coarse aggregate stream before cementitious powder or onto a moving aggregate belt. A minimum wet mixing time of 4–5 minutes after water addition is used to disperse the bundles into discrete fibers. Adding the fiber after free water can produce localized clumping in pan mixers and truck mixers when tip speed is below 1.5 m/s. Storage in original sealed bags is recommended above 60% relative humidity; surface moisture on the fiber can reduce free flow into the batch and prolong feed time. No pre-drying is required below that humidity threshold. On continuous shotcrete equipment, screw metering of pre-opened fiber packages into the conveyor feed has shown lower dosage variation than dumping full bags into the hopper.
EN 14889-2:2006 classifies macro synthetic fibers for structural use as Class II products and requires declaration of fiber length, tensile strength, modulus of elasticity, and alkali resistance as part of CE marking under system 1. ASTM C1116/C1116M Type III governs synthetic fiber-reinforced concrete, while ASTM C1399/C1399M specifies average residual strength of a cracked beam specimen. When flexural toughness indices are required, ASTM C1609/C1609M is used. Each batch of SikaFiber 255 is assigned a lot identification that links to conformity records for these designations. Specification writers should require a declared dosage from a field trial, not a generic table value, because residual strength depends on aggregate gradation, mixer energy, and placement method. The product is not classified as hazardous under REACH or CLP; however, the packaging should be inspected for damage that could compromise collated bundle integrity.
For wet-mix shotcrete in tunnel linings and slope stabilization, addition rates of 5.0–9.0 kg/m³ are metered into the mixing truck or nozzle feed. The absence of steel fibers removes the rebound loss of high-density steel fiber at the nozzle and reduces wear on rubber delivery hoses and shotcrete machine rotors. In precast production, SikaFiber 255 is used where distributed crack-width control and impact resistance are specified, but published data for slender sections below 80 mm is limited because fiber orientation at form faces can alter measured residual strength. Trial mixes must sample production batching rather than laboratory mixing: aggregate gradation, mixing energy, and vibration at the form face all influence fiber orientation and the resulting post-crack performance.
Residual strength values reported in design are direction-dependent because macro fibers orient preferentially in planes perpendicular to the direction of concrete flow, vibration, or spraying. A beam specimen cast horizontally will not necessarily predict the residual strength of a vertically placed wall or a shotcrete panel. Designers should apply orientation factors from fib Model Code 2010 or published technical literature, or specify specimens extracted from trial elements. The orientation factor is commonly between 0.4 and 0.8 for conventional casting, while shotcrete may show different in-plane orientation because of high-velocity projection and compaction against the substrate.
At addition rates above 6.0 kg/m³, SikaFiber 255 can reduce measured slump by 20–40 mm depending on coarse aggregate shape, fines content, and superplasticizer chemistry. The fiber surface is inert in alkaline pore solution and does not participate in cement hydration, but the physical interference of numerous discrete macro fibers increases plastic viscosity and temporarily immobilizes free water during initial mixing. Air entrainment remains effective if the air-entraining admixture is added after the fiber bundles have dispersed; fiber motion during mixing can destabilize entrained air voids, so trial batches should verify air content by ASTM C231/C231M or EN 12350-7. Polycarboxylate-based high-range water reducers generally restore slump without excessive retardation, but compatibility testing is required because fiber-induced viscosity changes can influence air bubble stability and admixture adsorption kinetics.
Compared with steel hooked-end fibers, SikaFiber 255 has a much lower elastic modulus of approximately 9,000 N/mm² versus approximately 200,000 N/mm² for steel. Consequently, the post-crack residual strength at equal volume fraction is lower, and structural design must account for the lower tensile contribution. The polypropylene macro fiber offers the absence of corrosion, lower mass addition, and reduced wear on mixing, pumping, and finishing equipment. Compared with micro synthetic fibers, SikaFiber 255 has a length of 30 mm and a dosage range of 3.0–9.0 kg/m³, whereas micro fibers are shorter than 20 mm and dosed at 0.6–1.5 kg/m³; the macro fiber affects post-crack load-bearing, not only plastic shrinkage. Compared with lower-grade polypropylene macro fibers, the material is distinguished by its tensile strength of 600 N/mm² and modulus of 9,000 N/mm², which should be verified on the supplier batch certificate rather than assumed from generic design values.
Storage at temperatures above 50 °C may soften polypropylene and cause bundle deformation, reducing feed consistency. Pallets should not be stacked more than two high in warm climates. The product should not be added to concrete with mixing water above 80 °C because the polymer melting point is approximately 162 °C; prolonged exposure above 130 °C can reduce tensile capacity. For structural placements, the final dosage must be confirmed by trial batches that measure residual flexural tensile strength according to EN 14651 or ASTM C1399/C1399M before placement of production concrete.
