| HS Code | 582073 |
| Product Name | Nycon RSC15-PVA Fiber for Concrete Reinforcement (8 denier) |
| Material | Polyvinyl Alcohol (PVA) |
| Denier | 8 |
| Cut Length | 15 mm |
| Fiber Form | Monofilament |
| Color | White |
| Specific Gravity | 1.30 |
| Tensile Strength | 1,600 MPa |
| Modulus Of Elasticity | 40,000 MPa |
| Elongation At Break | 6-7% |
| Melting Point | 220°C |
| Alkali Resistance | Excellent |
| Acid Resistance | Good |
As an accredited Nycon RSC15-PVA Fiber for Concrete Reinforcement（8 denier） factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Nycon RSC15-PVA Fiber for Concrete Reinforcement (8 denier) is packaged in 1 lb water-soluble bags, 40 bags per case. |
| Container Loading (20′ FCL) | Description: Nycon RSC15-PVA fiber packed on pallets and loaded into a 20′ FCL container, ensuring secure, space-efficient transport. |
| Shipping | Nycon RSC15-PVA Fiber ships in sturdy, moisture-protective packaging to preserve integrity. Transport via standard freight carriers is suitable; keep dry and avoid excessive compression. No hazardous designation typically applies, but use caution with dust. Ensure secure palletization and clear labeling for safe, efficient delivery. |
| Storage | Store Nycon RSC15-PVA Fiber in a cool, dry environment, sealed in its original packaging to prevent moisture absorption and lumping. Keep off bare ground on pallets, protected from rain, high humidity, and direct sunlight. Avoid contact with damp surfaces. Maintain good ventilation and store away from incompatible chemicals. Proper storage ensures optimal performance. |
| Shelf Life | Shelf life is indefinite when stored dry, away from sunlight and moisture, in original sealed packaging. |
In displacement-controlled uniaxial tensile tests of a high-volume fly ash binder containing Nycon RSC15 PVA fiber at 8 denier, the composite transitions from initial microcracking to steady-state crack opening when fiber volume fraction reaches 2.0 vol% (26 kg/m³) and the matrix fracture toughness remains below the composite bridging capacity. The fiber is classified under ASTM C1116/C1116M-23 as a Type III synthetic fiber. The polyvinyl alcohol monofilament has nominal filament diameter near 30 µm, supplier-reported tensile strength of 1.4-1.6 GPa, elastic modulus between 37 GPa and 41 GPa, and elongation at break between 6% and 7%. These values are not adjusted for orientation efficiency factor or fiber-matrix interfacial bond loss in a cementitious system. The production process for seismic coupling beams and link slabs uses a high-shear pan mixer or twin-shaft compulsory mixer with tip speed between 25 m/s and 35 m/s; the fiber is added after the polycarboxylate ether superplasticizer and mixing water have dispersed, and total mixing after fiber addition is limited to 4-6 min because the hydrophilic PVA surface adsorbs free water and raises plastic viscosity. Matrix proportioning falls within water/binder ratio 0.24-0.28, sand/binder ratio 0.36-0.46, and high-range water reducer dosage adjusted to mini-slump flow of 180-220 mm. Batch-to-batch variability is controlled by logging mixer torque after fiber addition; an upward torque drift exceeding 15% from the control batch indicates fiber agglomeration or changes in fly ash carbon content and requires rejection or extended mixing. Cast-in-place production uses immersion vibrators operating at 10,000-12,000 vpm, and each insertion is limited to 5 s to reduce fiber settlement in low-yield-stress matrices. Hardened composite compliance is evaluated under ASTM C1609/C1609M-19a for flexural residual strength and under project-specific tensile strain capacity protocols derived from ACI 374.1-05 or local seismic acceptance criteria. The terminal product class includes seismic coupling beams, beam-column joint retrofits, bridge deck link slabs, and structural wall repair zones where tensile strain capacity above 1% is required but reinforcing bar congestion limits concrete placement. Published data for this specific 8 denier configuration in full-scale seismic frames is limited; laboratory tensile strain capacity values should not be extrapolated to structural acceptance without confirmatory trial batching and large-scale slab testing.
Wet-mix shotcrete for tunnel linings and slope stabilization incorporates Nycon RSC15 at 0.30 vol% to 0.60 vol%, equivalent to 3.9 kg/m³ to 7.8 kg/m³ based on polyvinyl alcohol fiber density of 1.3 g/cm³. The lower dosage band targets plastic shrinkage crack reduction in freshly sprayed layers; the upper band improves green flexural toughness and reduces rebound on overhead and vertical surfaces. The fiber is dispersed at the batching plant in a twin-shaft compulsory mixer, not injected at the nozzle, because post-nozzle addition of 8 denier PVA monofilament has been observed in production-scale trials to form fiber ropes that obstruct 50 mm and 65 mm delivery lines. The concrete mixture is proportioned with maximum aggregate size 8 mm, slump 120-180 mm, and an alkali-free set accelerator dosage adjusted to final setting time of 3-8 min. Placement uses a twin-piston wet-mix shotcrete pump with delivery line diameter of 50 mm or 65 mm, discharge volume between 8 m³/h and 18 m³/h, and air injection at the nozzle of 250-400 L/min at 0.6-0.8 MPa. The downstream process sequence includes screening rebound from invert after each advance, mechanical troweling of the final lining surface, and wet curing for at least 7 days at ambient temperature above 5°C. Compliance is governed by ACI 506R-16 for placement, EN 14487-1:2005 for sprayed concrete specification, and ASTM C1116/C1116M-23 Type III synthetic fiber classification. Terminal finished product types include permanent single-shell tunnel linings, rock slope stabilization facings, underground opening support layers, and repair linings in deteriorated culverts. Operational boundary: the fiber is not a direct replacement for welded wire mesh where the ground class requires post-crack flexural capacity beyond what is achieved at 0.60 vol%, and water demand increases at the upper dosage band must be compensated with polycarboxylate ether superplasticizer rather than added water.
Where precast elements are stripped at early age, the use of Nycon RSC15 at 0.5-1.0 kg/m³ (0.04-0.08 vol%) reduces edge chipping and plastic shrinkage cracking without displacing conventional distributed reinforcement. The downstream production line for architectural wet-cast panels and thin-wall surrounds begins with central mixing in a planetary pan mixer, with the fiber added after aggregates and cement have been blended for 60 s; total mixing time is extended by 90 s relative to the non-fiber control to disperse the 8 denier monofilament. Formworks are filled with external vibration operating at 50-100 Hz, and vibration is stopped when surface air release becomes intermittent, as prolonged vibration can orient the fibers parallel to mold faces and reduce crack bridging in the perpendicular direction. Demolding is permitted only when the concrete reaches stripping strength specified by PCI MNL-116 or the project structural engineer; typical stripping strength for thin architectural panels is not less than 10 MPa compressive strength, but the value is not a fixed material property. Fiber conformity is documented under EN 14889-2:2006 for polymer fibers for concrete, and plastic shrinkage crack control is evaluated under ASTM C1579-21. Terminal finished product types include non-load-bearing architectural cladding panels, recessed window surrounds, and precast coping units. Operational boundary: the addition rate of 0.08 vol% does not provide structural residual flexural strength and does not justify reducing steel reinforcement cover or corner reinforcement; demolding time is controlled by concrete strength gain, not by fiber content.
When a slab-on-ground pour is placed under hot-weather evaporation rates exceeding 0.5 kg/m²/h, the addition of Nycon RSC15 at 0.9-1.8 kg/m³ (0.07-0.15 vol%) reduces plastic shrinkage crack formation in the period between screeding and final set. The fiber type is an 8 denier monofilament polyvinyl alcohol fiber with a hydrophilic surface that disperses in low-slump concrete without the balling observed with some monofilament polyolefin fibers. The placing process uses a laser screed for initial leveling, a bull float to close the surface, and power trowels with blade pitch adjusted from flat to progressively higher angles; PVA microfibers do not protrude significantly through the trowel finish because the filament diameter is approximately 30 µm. The concrete is specified with slump of 100-150 mm, maximum aggregate size of 20 mm, and water/cement ratio not exceeding 0.50 for interior slabs. Acceptance testing for plastic shrinkage crack control is performed under ASTM C1579-21, while floor flatness and levelness are measured under ASTM E1155-20; fiber-reinforced concrete classification is reported under ASTM C1116/C1116M-23 Type III synthetic fiber. The floor design and joint layout follow ACI 360R-10 and ACI 302.1R-15. Terminal finished product types include warehouse distribution center floors, logistics hardstands, freezer slab replacements, and exterior concrete aprons. Operational boundary: the fiber does not replace saw-cut contraction joints, does not change the coefficient of thermal expansion, and does not eliminate the need for wet curing or evaporation retardants when the evaporation rate exceeds 1.0 kg/m²/h.
The application of a polymer-free repair overlay containing Nycon RSC15 at 1.0-2.0 vol% (13-26 kg/m³) addresses shrinkage-induced microcracking in patch materials placed over chloride-contaminated concrete. Substrate preparation follows abrasive blasting to an ICRI concrete surface profile of CSP 5 to CSP 7, removal of unsound concrete behind reinforcing steel, and conditioning to a saturated surface-dry state to prevent rapid water loss from the repair mortar. The dry components are mixed in a forced-action or high-shear mortar mixer with water added to a mortar flow of 140-180 mm per the drop-table method; Nycon RSC15 is preblended with the dry mortar or added after initial wetting, and total mixing is maintained for 4-5 min to separate the 8 denier filaments. Pot life at 20°C is governed by cement hydration and should not exceed 45-60 min; cyclic retempering with water is prohibited. The mortar is applied by hand trowel or low-velocity wet spray, with layer thickness not exceeding 50 mm per pass unless the manufacturer's tested shuttering and pour rate confirm stability. Curing uses a curing compound or continuous wet burlap for 7 days. Compliance is specified under EN 1504-3 class R4 for structural repair mortars and ASTM C928/C928M-20 for packaged dry repair materials; fiber conformity is documented under EN 14889-2:2006. Terminal finished product types include bridge deck overlay patches, parking garage slab repairs, masonry repair mortars, and concrete repair of marine berth tops. Operational boundary: Nycon RSC15 is not a corrosion-inhibiting admixture, does not lower chloride diffusion on its own, and must not replace a specified corrosion mitigation system such as impressed current cathodic protection or galvanic anodes; adhesion of the overlay must be verified by pull-off testing under ASTM C1583-13 prior to opening to traffic.
Coastal water-retaining concrete exposed to cyclic wetting, wind-borne chloride spray, and restrained shrinkage incorporates Nycon RSC15 at 0.5-1.5 kg/m³ (0.04-0.12 vol%) to reduce the width of drying shrinkage microcracks that act as preferential ingress paths. The production process uses a low-permeability matrix with water/cementitious materials ratio not exceeding 0.45, supplementary cementitious materials such as fly ash or slag at 20-50% by mass of cementitious material, and an ASTM C260 air-entraining admixture where freeze-thaw resistance is required. The fiber is mixed in a twin-shaft compulsory mixer for 60-90 s after the initial aggregate-cement blending; extended mixing beyond 180 s after fiber addition is avoided because it increases temperature and may reduce workability. Placement in slipformed parapet walls and water treatment tank walls uses concrete with slump of 100-150 mm, internal vibrators at 8,000-12,000 vpm, and continuous placement lifts to avoid cold joints. Compliance for the concrete structure is governed by ACI 350-20 for environmental structures, EN 206 for exposure classes, and ASTM C1585-20 for water absorption rate where project specifications require a performance benchmark; fiber classification is under ASTM C1116/C1116M-23 Type III synthetic fiber. Terminal finished product types include seawall cap beams, water treatment basin walls, stormwater culvert headwalls, and tidal pool retaining walls. Operational boundary: the fiber reduces crack width but does not make concrete impermeable; the governing permeability is controlled by water/cementitious materials ratio, curing, and compaction, and the fiber does not replace waterstops at construction joints or expansion joints.
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Nycon RSC15-PVA is an 8-denier polyvinyl alcohol monofilament fiber specified for concrete reinforcement. Manufacturer technical literature associates the product with an 8 mm cut length, a nominal specific gravity of 1.30 g/cm³ when measured under ISO 1183-1, a single-filament tensile strength in the range of 1,000 MPa to 1,100 MPa, and a tensile modulus of approximately 33 GPa. Linear density measured under ASTM D1907 or ISO 1973 gives 0.889 g/km; from this value and the specific gravity, the nominal filament diameter is 29.5 μm. The calculated mass per filament at 8 mm cut length is 7.11 × 10⁻⁶ g, so 1 kg contains approximately 1.41 × 10⁸ discrete filaments. This fiber count is the primary engineering variable controlling dispersion, surface area demand, and early-age crack control. Under ASTM C1116/C1116M-23, the material is classified as a Type III synthetic fiber-reinforced concrete component when used as nonstructural secondary reinforcement.
In batching operations, the product is introduced after aggregate and cement but before final water adjustment, with the mixer running at high speed. Because 1 kg of the fiber provides more than 100 m² of filament surface area, the material competes with cement paste for free water. This is a processing conflict rather than a material defect. The lateral surface area per filament is approximately 0.742 mm²; multiplied by the filament count, the total surface area is approximately 105 m²/kg. In low water-to-cementitious ratio mixtures below 0.40, the result is often a measurable slump reduction that must be corrected with high-range water-reducing admixture, not by adding water. Trial batching to ASTM C94/C94M-24 is required to establish the mix adjustment for local cement and aggregate sources.
Dispersion difficulty is governed by fiber count and surface area, not solely by fiber mass. At 1.8 kg/m³ dosage, the product contributes approximately 2.54 × 10⁸ filaments per cubic meter. In a forced-action pan mixer or twin-shaft mixer, this population can be distributed uniformly if the fiber is dosed over 30 s to 60 s during wet mixing. In rotating drum mixers, the same dosage frequently produces rope-like clumps at the discharge gate because shear energy is nonuniform. The difference between these equipment types is not addressed by the fiber specification alone; it emerges only in production-scale behavior. Mixer paddle condition is a practical variable: worn paddles reduce shear and produce batch-to-batch variation in fiber distribution even when the batching sequence and dosage remain constant.
The product should be added after initial aggregate and cement mixing, followed by 60 s to 90 s of continued mixing before slump measurement. Slump should be measured under ASTM C143/C143M. If the mixture falls below the specified slump, water addition beyond the approved mix design is not permitted because it changes the water-cementitious ratio and offsets the plastic shrinkage reduction the fiber is intended to provide. Instead, the mix design should be adjusted with a superplasticizer based on trial batching. Published data for this specific configuration across all aggregate sources is limited; therefore, plant trials remain mandatory for repeatable workability retention.
The 29.5 μm filament diameter places the product in the microsynthetic range, but the chemical behavior differs from polyolefin microfibers. PVA is hydrophilic and takes up mix water more readily than polypropylene. At identical water-cementitious ratio, a PVA-dosed mixture may show greater apparent cohesiveness and lower slump. This is not an indicator of poor fiber quality; it is the expected rheological response of high-surface-area hydrophilic filaments. Mixture proportioning should therefore be based on the water demand of the entire system, including fiber surface area, rather than on the original plain concrete mixture.
In slab-on-ground work, nonstructural cracking-control dosages are commonly specified between 0.6 kg/m³ and 1.8 kg/m³. The material is placed by conventional laser-screed or paving equipment without special finishing requirements. Its tensile modulus is close to that of hardened cement paste, but the fiber is not intended to raise structural flexural stiffness. The design function is early-age crack-width control, reduction of plastic settlement, and restraint of bleed-induced surface cracking. Plastic shrinkage performance should be verified under ASTM C1579/C1579M-21, with acceptance criteria for crack area established by the project specification.
For shotcrete, the fiber is batched in dry or wet process mixes and conveyed through the nozzle. Dosages up to 2.6 kg/m³ are used for temporary ground support and slope protection where crack control and rebound reduction are required. Fiber-reinforced shotcrete performance should be qualified by toughness testing under ASTM C1550 or EN 14488-5 when post-peak energy absorption is specified. The 8-denier filament does not provide equivalent toughness to steel macrofibers at the same mass dosage; therefore, substitution is not permissible without project-specific beam or panel testing.
Substitution of PVA for polypropylene is not a one-to-one mass replacement. Polypropylene monofilament fibers used for plastic shrinkage control generally exhibit tensile strengths between 300 MPa and 600 MPa and elastic moduli between 3 GPa and 8 GPa. The PVA product exhibits tensile strength above 1,000 MPa and modulus near 33 GPa. The critical difference is chemical: PVA contains hydroxyl groups that can form hydrogen bonds with calcium-silicate-hydrate surfaces, whereas polyolefin filaments rely primarily on mechanical anchorage and are hydrophobic. This interfacial bond can produce greater crack-bridging efficiency at small crack openings, but it also increases sensitivity to moisture and mix water demand.
| Property | Nycon RSC15-PVA (8 denier) | Polypropylene microfilament | Steel hooked-end macrofiber |
|---|---|---|---|
| Specific gravity | 1.30 g/cm³ | 0.90–0.96 g/cm³ | 7.85 g/cm³ |
| Tensile strength | 1,000–1,100 MPa | 300–600 MPa | 1,000–2,000 MPa |
| Tensile modulus | 33 GPa | 3–8 GPa | 200 GPa |
| Corrosion behavior | Non-corroding | Non-corroding | Corrosion possible at crack openings |
| Primary function | Plastic shrinkage and microcrack control | Plastic shrinkage control | Post-peak flexural residual strength |
| Typical dosage range | 0.6–2.6 kg/m³ | 0.6–1.8 kg/m³ | 15–60 kg/m³ |
Table entries are compiled from manufacturer technical literature and typical ranges in EN 14889-2:2006 and ASTM C1116/C1116M-23; they do not replace project-specific certification or batch test data. The steel macrofiber range is included because designers sometimes compare PVA with steel fibers at equal mass dosage, which is invalid for structural crack-width control. Steel fibers have higher density and much higher modulus but lower fiber count per kilogram; PVA fibers provide a high number of closely spaced filaments that bridge microcracks but do not produce the same residual flexural strength in cracked concrete.
Because PVA has a specific gravity of 1.30 g/cm³, it remains closer to the density of the fluid cement paste than polypropylene. This reduces buoyancy-driven segregation during vibration and finishing. Polypropylene fibers can migrate to the surface in low-viscosity paste, producing visible fuzz and surface defects under troweled finishes. The PVA product reduces this tendency, but overdosing or insufficient mixing can still produce surface fiber accumulation. Finishing operations should be timed according to the actual bleed rate of the fiber-dosed concrete, not according to the plain concrete baseline.
The 29.5 μm filament diameter and 8 mm length place this product near the upper end of microsynthetic fiber geometry. Compared with finer polypropylene microfibers, it gives lower fiber count at equal mass dosage but higher tensile strength and interfacial bond. Compared with coarser PVA macrofibers, it does not provide the same post-peak crack-bridging capacity. The model designation RSC15-PVA therefore identifies a crack-control fiber rather than a structural macrofiber. Any use in structural residual strength applications requires beam testing under ASTM C1609/C1609M-19a or equivalent project criteria.
Where specification requires formal compliance, the product is evaluated under EN 14889-2:2006 as a polymer microfibre and, in the United States, under ASTM C1116/C1116M-23 Type III. Single-filament tensile strength and elongation are reported using ISO 2062 or ASTM D2256/D2256M. Cut length is verified by ASTM D5103. Batch certificates should record denier, cut length, specific gravity, and tensile strength. For structural applications, the certificate is not sufficient; beam or panel testing on the actual concrete mixture is required because fiber-cement matrix interaction depends on cement chemistry, aggregate angularity, and mixing energy.
The fiber is chemically stable in the alkaline pH range of portland cement concrete, typically pH 12.5–13.5. Prolonged immersion in water can plasticize the filament and change apparent elongation; therefore, mechanical comparisons after mixing should be conducted on hardened concrete rather than on wet-conditioned filaments. Storage should be limited to dry, covered conditions below 60% RH. If bags have been exposed to humid air and clumping is visible, the material should be dried to a moisture content below 0.5% by mass and re-tested for cut length distribution before use.
The product is not intended for autoclave curing above the PVA thermal degradation threshold. Published data for this specific configuration at elevated curing temperatures is limited, and the manufacturer should be consulted for cure regimes above 80°C. In precast elements where cure temperature exceeds normal ambient conditions, trial testing should include flexural and compressive tests on fiber-dosed specimens cured under the actual thermal cycle. This is necessary because PVA may lose strength or undergo dimensional change at extended high-temperature exposure.
The fiber should not be combined with hydrophobic surface coatings or admixtures that may interfere with the hydrogen bonding between PVA and cement hydrates. Compatibility is not covered by routine ASTM concrete testing and requires bench-scale mixing. In production, the most common failure mode is not chemical incompatibility but clumping caused by worn mixer paddles, insufficient wet mixing time, or excessive fiber dosage in low-shear equipment. When fiber clumps appear at discharge from a twin-shaft mixer, the first corrective action is inspection of paddle condition and batching sequence, followed by a reduction in dosage only if the mix design permits.
