| HS Code | 502813 |
| Product Name | SikaFiber Novomesh - Micro Fibrillated Fiber |
| Material | 100% virgin polypropylene |
| Fiber Type | Micro fibrillated |
| Appearance | White/natural |
| Fiber Length | 19 mm |
| Specific Gravity | 0.91 g/cm³ |
| Tensile Strength | 400-600 MPa |
| Elastic Modulus | 3.5 GPa |
| Melting Point | 160-170 °C |
| Ignition Point | >570 °C |
| Alkali Resistance | Excellent |
| Acid Resistance | Excellent |
| Water Absorption | Nil |
| Dosage | 0.6-1.8 kg/m³ |
| Packaging | 0.6 kg bags |
| Shelf Life | 24 months |
| Storage | Dry, protected from UV |
As an accredited SikaFiber Novomesh - Micro Fibrillated Fiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SikaFiber Novomesh comes in 600 g (1.3 lb) water-soluble bags, 12 bags per carton, for direct concrete mixing. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized SikaFiber Novomesh micro fibrillated fiber bags, secured, shrink-wrapped, and ready for export shipment. |
| Shipping | SikaFiber Novomesh – Micro Fibrillated Fiber is shipped as a non-hazardous, non-flammable solid, typically in factory-sealed, moisture-resistant bags or bulk sacks on pallets. It is generally not regulated as dangerous goods for transport. Store in a dry, covered area and protect packaging from punctures and moisture. |
| Storage | Store SikaFiber Novomesh – Micro Fibrillated Fiber in a cool, dry, well-ventilated area, away from direct sunlight, heat, sparks, and open flames. Keep original packaging sealed and palletized off the floor to prevent moisture and contamination. Avoid excessive stacking or damage. Use oldest stock first and follow local regulations. |
| Shelf Life | SikaFiber Novomesh - Micro Fibrillated Fiber: 24 months shelf life if stored dry, in original unopened packaging, at normal temperatures. |
Ready-mix concrete supplied under EN 206:2013+A2:2021 and ASTM C94/C94M-21 incorporates SikaFiber Novomesh at the batching plant after aggregate moisture correction and before cementitious powder discharge. The typical dosage for slab-on-grade applications is 0.6–1.0 kg/m³, with a mid-range target of 0.9 kg/m³ where plastic shrinkage crack widths are specified not to exceed 0.3 mm at 24 h under ASTM C1579-21 restrained panel conditions. At this dosage, slump reduction measured by ASTM C143/C143M-20 is typically between 10 mm and 25 mm, requiring water-reducing admixtures conforming to ASTM C494/C494M-19 Type A or Type F to restore placement slump to 150 mm ± 20 mm. Full-scale batching with twin-shaft compulsory mixers indicates that the fibre must be dosed through a mechanical hopper over the fine aggregate stream for a minimum of 60 s before water contact; otherwise dry fibre agglomerates can form in the mixer throat and survive transport in truck mixers rotating at 14–18 rpm for 70–100 revolutions. Placement proceeds through boom pumps with 125 mm reduced line diameter where maximum aggregate size is 20 mm, followed by laser screed leveling and power trowel finishing. Power trowel blade pressure must be reduced below 3.5 kPa during early floating to avoid drawing micro fibrils to the surface and creating a fuzzy finish. Terminal products include warehouse floor slabs, logistics hardstands, and external service yards subject to forklift traffic and early thermal movement. Published data for exact abrasion resistance improvement at 0.9 kg/m³ under ASTM C779/C779M-19 remains limited, and qualification trials are recommended where flatness classes FF50 or higher are specified.
Where demoulding turnaround below 10 h is the controlling cost parameter, precast concrete plants operating under EN 13369:2023 and EN 14889-2:2006 incorporate SikaFiber Novomesh at 0.7–1.2 kg/m³ in low water-cement ratio mixes of 0.36–0.42 using polycarboxylate superplasticizers conforming to EN 934-2:2019. The fibre is added to the planetary counter-current mixer discharge after the initial aggregate-cement dry blend has achieved 30–45 s of dry mixing; delayed addition reduces fibre damage from high-speed whisk action. Production of 90 mm thick cable troughs and 120 mm thick manhole riser units demonstrates that uniform fibre distribution is verified by dosing consistency below ±5% against target mass and by visual inspection of broken fresh samples under ISO 1920-4:2020 slump-flow criteria. The downstream process includes low-frequency external form vibrators operated at 50–60 Hz for 15–30 s per station; excessive vibration beyond 45 s can align fibrils along the form face and reduce edge integrity. Oven curing at 60 °C for 6–8 h is used to achieve demoulding compressive strength of not less than 15 MPa; below this threshold, lifting lugs may induce microcracking at the junction between the fibre-reinforced matrix and unreinforced insert zones. Terminal products include manhole risers, cable troughs, box culvert segments, and retaining wall panels where resistance to edge spalling during stripping and storage is the primary performance endpoint. Compliance to EN 14889-2:2006 polymer fibre conformity is documented through batch records, but published post-crack performance data for this specific thin precast section configuration is limited, and design assumptions should not rely on macro-fibre residual strength.
Wet-mix sprayed concrete produced according to EN 14487-1:2005 and ACI 506R-16 uses SikaFiber Novomesh at addition rates of 0.7–1.0 kg/m³ in combination with alkali-free accelerating admixtures dosed at the nozzle at 4–8% by weight of cement. The fibre is added at the batching plant before pumping; in tunnel site conditions, the addition point at the colloidal mixer must be monitored because the shear rate in the wet-mix pump line—typically 8–12 l/min for a 4 m³/h robotic spraying cell—can transform incomplete dispersion into compacted fibre bundles that settle at the bottom of the holding hopper. Field measurements of pump pressure show an increase of 0.5–1.0 bar at 0.9 kg/m³ dosage compared with plain wet-mix shotcrete, requiring a minimum pump capacity of 30 bar and a piston head speed below 0.4 m/s to avoid pressure-driven segregation. Rebound rates on vertical and overhead surfaces typically remain within 10–18% when nozzle distance is held at 1.0–1.5 m and nozzle angle at 90° ± 10°; higher rebound produces an under-fibered in-place layer because micro fibrils are preferentially lost with rebound aggregate. The accelerated material is applied in layers up to 100 mm per pass, with spraying air flow at 7–9 m³/min and accelerator dosage adjusted to achieve final set at 3–5 min. Terminal products include primary tunnel linings in rock classes III–IV, slope stabilization shells, and shaft lining repairs where pumpability, low rebound, and early-age crack control are process-critical. Published data for in-situ fibre content under EN 14488-7:2006 using wash-out methods indicates a coefficient of variation below 8% only when the fresh shotcrete is sampled at the nozzle rather than the hopper.
In cementitious self-smoothing screeds conforming to EN 13813:2002 and applied as bonded or unbonded underlayments, SikaFiber Novomesh is dosed at 0.3–0.8 kg/m³ to reduce plastic settlement cracking without compromising flow diameter. At 0.5 kg/m³ in a typical formulation with 450 kg/m³ CEM I 42.5 R and 0.45 water-cement ratio, flow diameter measured by ASTM C1708/C1708M-19 ring flow cone remains within 240–260 mm, while dosage above 0.8 kg/m³ reduces flow below 220 mm and increases trowel drag during pin-roller release. The production process uses continuous mixing pumps with rotor-stator or high-shear mixing chambers operating at 500–800 rpm; fibres are pre-blended with the dry mix in a planetary mixer for 4–6 min before water addition, and wet mixing continues for 2–3 min after the powder stream has reached the target water ratio. Application at 3–10 mm thickness requires a gauge rake to break surface tension and a spiked roller to remove entrapped air; field reports from large-area floor renovation projects indicate that roller speed below 0.5 m/s allows fibrils to orient horizontally and reduces visible fibre protrusion at the surface. Terminal products include floor underlayments for vinyl, tile, and epoxy topcoats in commercial and residential retrofit work, as well as sound-reduction base layers where ISO 10140-3:2010 impact noise performance must be maintained. Compliance is documented through EN 14889-2:2006 polymer fibre conformity, but published data for this specific self-leveling configuration under ASTM C1708/C1708M-19 is limited.
| Application context | Typical dosage range | Primary compliance anchor | Critical process boundary |
|---|---|---|---|
| Ready-mix slab-on-grade | 0.6–1.0 kg/m³ | ASTM C1579-21, EN 206:2013+A2:2021 | Mechanical hopper dosing before water contact; trowel blade pressure below 3.5 kPa |
| Thin-walled precast sections | 0.7–1.2 kg/m³ | EN 13369:2023, EN 14889-2:2006 | External vibration not exceeding 45 s per station; demoulding strength not below 15 MPa |
| Wet-mix shotcrete | 0.7–1.0 kg/m³ | EN 14487-1:2005, ACI 506R-16 | Nozzle distance 1.0–1.5 m; pump pressure increase limited to 1.0 bar |
| Self-smoothing underlayment | 0.3–0.8 kg/m³ | EN 13813:2002, ASTM C1708/C1708M-19 | Flow diameter maintained above 220 mm; roller speed below 0.5 m/s |
| Bagged repair mortar | 0.5–1.0 kg/m³ | EN 1504-3:2023 | Site mixing after hydration onset is excluded; relative humidity not below 40% |
| Dry-mix render | 0.5–1.0 kg/m³ | EN 998-1:2016, EN 14889-2:2006 | Ribbon blender speed limited to 25–35 rpm; substrate moisture below 5% |
Structural and non-structural repair mortars mixed under EN 1504-3:2023 and placed by trowel or low-pressure spray use SikaFiber Novomesh at 0.5–1.0 kg/m³ to control early shrinkage in small-area patches where curing water loss is accelerated by substrate suction. In a typical polymer-modified cementitious repair mortar with 350–400 kg/m³ binder and 0.40 water-cement ratio, the fibre is dry-blended with the powder component before site water addition in a forced-action paddle mixer at 350–450 rpm for 3 min; adding the fibre into the wet slurry after cement hydration has begun produces irreversible clumping and visible lumps that cannot be re-dispersed by longer mixing. The substrate is maintained in a saturated surface-dry condition for at least 24 h before application, and ambient relative humidity limits are set at 40–80%, because below 40% RH the fibre-reinforced repair layer loses bleed water rapidly and may develop plastic shrinkage cracks at stress risers around embedded anchors. Application thickness ranges from 10 mm to 50 mm per layer, with wood or polyurethane trowels used for surface closing; metal trowel use at blade angles above 20° can drag fibrils and create surface threads. Terminal products include spall repairs on columns and beams, edge reconstruction of loading docks, and patch repair of precast panel returns where subsequent coating adhesion under ISO 4624:2016 pull-off testing must remain above 1.0 MPa. Published data for the specific combination of micro-fibrillated fibre and styrene-butadiene latex in structural repair mortars is limited, and compatibility trials with the proposed bonding agent are required.
High-performance cementitious render and fairing coat formulations manufactured as dry-mix bag goods under EN 998-1:2016 and EN 14889-2:2006 use SikaFiber Novomesh at 0.5–1.0 kg/m³ of wet mortar. In a 1,000 kg dry-mix batch, the fibre is introduced into a horizontal ribbon blender after the cement, graded silica sand, and air-entraining agent have been pre-mixed for 4 min; total dry blending time is 6–8 min, and the blender speed is limited to 25–35 rpm because higher shear can fibrillate the fibre bundles prematurely and reduce the discrete filament count. The bagged product is mixed on site with 5.5–6.0 L water per 25 kg bag in a helical paddle mixer for 2 min, applied by stainless steel trowel in layers of 8–15 mm, and left to mature under polyethylene sheet at 5–30 °C for 48 h. Terminal products include exterior mineral renders, colored fairing coats under silicone-based finishes, and repair renders for salt-laden substrates where capillary water uptake under EN 1015-18:2002 must remain below 0.3 kg/(m²·min0.5). Application over substrates with moisture content above 5% by mass or without a bonding agent is not recommended. Published data for this specific dry-mix render under EN 1015-10:1999/A1:2006 flexural strength testing is limited.
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SikaFiber Novomesh - Micro Fibrillated Fiber is a melt-spun polypropylene micro-fiber supplied as a pre-weighed fibrillated network that separates into individual micro-filaments under concrete mixer shear. The product is classified as a Type III synthetic fiber-reinforced concrete addition under ASTM C1116/C1116M-23 when the concrete batch is proportioned and sampled accordingly. The nominal fiber length is 19 mm, the specific gravity is 0.91, and the fiber is non-absorbent and chemically inert in the alkaline pore solution of concrete. The primary documented function is the reduction of plastic shrinkage cracking in slabs, slabs-on-ground, composite metal deck slabs, and similar flatwork, with secondary post-crack toughness gained at higher addition rates. The product is not a replacement for structural reinforcement or for crack-width control under service loads in hardened concrete. Published data for the drawn polypropylene filament indicate a tensile strength in the range of 400 MPa to 600 MPa when tested in accordance with ASTM D638-14, with a modulus of elasticity in the range of 3.5 GPa to 4.0 GPa. Because fibrillated fibers open into a network, the relevant dosage is expressed in mass per cubic metre rather than fiber count.
In a restrained plastic shrinkage test performed under ASTM C1579-21, fibrillated micro-fibers reduce total crack area by increasing the number of individual crack-bridging filaments per unit volume. The fibrillation process produces a high surface-area network rather than a single round filament; after mixing, the opened fibrils anchor into the cement paste and fine aggregate fraction. This differs from monofilament polypropylene micro-fibers, which rely on discrete filament count and smaller cross-sections. The crack-bridging effect is most measurable before initial set, when capillary pressure in the concrete pore system rises and the weak early matrix cannot resist tensile strain. Under ASTM C1581/C1581M-18a restrained-ring testing, the presence of fibrillated micro-fibers has been associated with delayed cracking age and reduced crack opening in mortar systems, although project-specific validation is required because results depend on cement content, aggregate type, and evaporation rate. A dosage of 0.9 kg/m³ is commonly selected for plastic shrinkage control; higher dosages in the 1.2 kg/m³ to 1.8 kg/m³ range are used when hardened concrete toughness or impact resistance is also specified.
A batch release check for this product does not rely on a single fiber property. The concrete producer typically records fiber type, batch weight, addition time, and total mixer revolutions. For fresh concrete, slump is measured in accordance with ASTM C143/C143M-20, and entrained air is determined by ASTM C231/C231M-17a when air entrainment is specified. The fiber addition itself does not chemically alter set time, but high dosages can reduce slump by 10 mm to 30 mm depending on aggregate grading and water content. Compressive strength is normally tested by ASTM C39/C39M-21, but micro-fibers are not added to increase compressive strength. Flexural toughness and residual load capacity, when relevant, are evaluated under ASTM C1609/C1609M-19a or ASTM C1399/C1399M-10. Those test methods are primarily designed for macro-fibers; for micro-fibrillated products, the measured residual loads are small compared with steel fibers. Published data for this specific configuration is limited for the ASTM C1609 beam method, and the supplier or laboratory qualification plan should confirm expected deflection and load criteria before inclusion in project specifications.
| Property | Fibrillated polypropylene micro-fiber | Monofilament polypropylene micro-fiber | Steel hooked-end fiber | Macro-synthetic fiber |
|---|---|---|---|---|
| Nominal length | 19 mm | 6 mm to 12 mm | 25 mm to 60 mm | 30 mm to 50 mm |
| Specific gravity | 0.91 ASTM D792-20 | 0.90 to 0.92 ASTM D792-20 | 7.85 | 0.90 to 0.95 |
| Tensile strength | 400 MPa to 600 MPa ASTM D638-14 | 300 MPa to 550 MPa ASTM D638-14 | 1000 MPa to 1500 MPa | 400 MPa to 700 MPa |
| Modulus of elasticity | 3.5 GPa to 4.0 GPa | 3.0 GPa to 4.0 GPa | 200 GPa | 5 GPa to 10 GPa |
| Primary concrete test method | ASTM C1579-21, ASTM C1581/C1581M-18a | ASTM C1579-21 | ASTM C1609/C1609M-19a | ASTM C1609/C1609M-19a |
| Post-crack load capacity | Low | Low | High | Moderate |
| Corrosion risk | None | None | High if exposed | None |
| Typical dosage | 0.6 kg/m³ to 1.8 kg/m³ | 0.6 kg/m³ to 1.2 kg/m³ | 20 kg/m³ to 60 kg/m³ | 3 kg/m³ to 10 kg/m³ |
The operational boundary most often encountered on production lines is high mixer shear combined with low water content. At addition rates above 1.8 kg/m³ in concrete with a slump below 80 mm, fibrillated polypropylene fibers can form visible balls if they are discharged too quickly into a stationary or slow mixer. The failure mode is not chemical incompatibility but incomplete mechanical opening of the fibrillated network. To avoid this, the fiber should be added to the mixer after the coarse and fine aggregates and before the final water, or onto the aggregate stream in a central batch plant. A wet mixing time of at least 5 minutes after the last fiber addition is commonly specified for truck mixers operating at 12 rpm to 18 rpm. In twin-shaft compulsory mixers with higher shear, the same dosage may require only 60 seconds to 90 seconds of additional mixing after fiber introduction. If the load is discharged before full dispersion, fiber balls are typically visible on the concrete surface after finishing and cannot be fully corrected by re-tempering.
Steel hooked-end fibers operate through plastic deformation of the anchorage, whereas fibrillated polypropylene micro-fibers transfer stress through surface fibrillation and matrix interlock. The difference has direct implications for specification. Steel fibers are selected when the hardened concrete must carry residual flexural loads after cracking; they are commonly tested under ASTM C1609/C1609M-19a at dosages from 20 kg/m³ to 60 kg/m³. Macro-synthetic fibers are used at intermediate dosages from 3 kg/m³ to 10 kg/m³ for post-crack toughness in tunnels, slabs, and precast elements, and they are often tested under the same beam method. Fibrillated micro-fibers such as SikaFiber Novomesh are not intended to supply the same residual-load capacity. Their primary standardized evaluation is plastic shrinkage cracking under ASTM C1579-21 or restrained-ring testing under ASTM C1581/C1581M-18a. In comparison with monofilament polypropylene micro-fibers, the fibrillated geometry increases the number of fine surface fibrils per unit mass, improving crack-bridging in the plastic stage but complicating dispersion if added after the mixing water. The product is generally added at 0.9 kg/m³ for single-bag dosing in concrete with routine slump ranges.
If an air-entraining admixture is dosed before the fiber has fully opened, the surfactant layer may alter the wetting of the polypropylene surface and influence fiber distribution without necessarily changing the total entrained air. The more significant process variable is sequencing: polypropylene micro-fibers are hydrophobic and can temporarily reduce slump, while air-entraining agents increase paste volume and may mask some of that slump loss. Field checks with ASTM C231/C231M-17a pressure-meter readings are required because the addition of fibrillated fiber can reduce measured air by 0.5 to 1.0 percentage points in some mixes, particularly when the fiber is added before the air-entraining admixture has stabilized. Producers should not compensate by overdosing air-entraining admixtures without verifying air-void distribution under ASTM C457/C457M-16 because an unstable air-void system may reduce frost resistance. In hot-weather placement with evaporation rates above 1.0 kg/m²/h, the use of fibrillated micro-fiber does not remove the need for fogging, windbreaks, wet curing, or evaporation retarders. The fiber controls crack initiation in the plastic state but does not prevent surface crusting or rapid moisture loss. In slab-on-ground construction, finishing operations should not follow the fiber addition with excessive trowelling, particularly at dosages above 0.9 kg/m³, because surface closure may occur before the underlying concrete has fully settled. Published data specific to SikaFiber Novomesh in all placement configurations is limited; verification through field mock-ups and laboratory qualification remains the basis for project acceptance.
