| HS Code | 645562 |
| Tenacity | 10–14 cN/dtex |
| Initial Modulus | 250–350 cN/dtex |
| Elongation At Break | 4–8% |
| Density | 1.28–1.30 g/cm³ |
| Fiber Diameter | 10–20 μm |
| Available Cut Length | 3–12 mm |
| Moisture Regain | ≤5% |
| Melting Point | ~230°C |
| Decomposition Temperature | ~260°C |
| Alkali Resistance | Excellent resistance to strong alkali and saturated limewater |
| Acid Resistance | Good resistance to dilute acids; moderate resistance to concentrated acids |
| Uv Resistance | Very good resistance to ultraviolet light |
| Abrasion Resistance | Excellent |
| Thermal Stability | Stable up to 150°C |
| Surface Property | Rough surface with high cement affinity |
| Toxicity | Non-toxic and environmentally safe |
As an accredited Fujian Fuwei-High Strength High Modulus Vinylon PVA Fiber（HSHM PVA Fiber） factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Fujian Fuwei HSHM PVA Fiber is packaged in 25 kg moisture-proof woven bags with inner plastic lining. |
| Container Loading (20′ FCL) | 20′ FCL of Fujian Fuwei HSHM PVA fiber: palletized, secured bales in ventilated container, safe, efficient dry shipment. |
| Shipping | Fujian Fuwei HSHM PVA Fiber is shipped in moisture-proof, reinforced woven bags or cartons, palletized and containerized for safe transport. Ensure dry, ventilated conditions, avoid compression damage, and protect from rain during loading. Standard sea, air, or land freight is suitable with proper handling. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep original packaging sealed to prevent moisture absorption and contamination. Avoid stacking excessively or applying heavy pressure. Protect from rain and humidity; maintain moderate temperature. Ensure good housekeeping and no exposure to oxidizing agents or chemicals. |
| Shelf Life | Shelf life is typically 2 years when stored in a cool, dry, well-ventilated area away from direct sunlight. |
Fujian Fuwei high-strength high-modulus vinylon PVA fibre (HSHM PVA fibre) is specified in downstream production routes where fibre modulus, alkali resistance, and dispersion stability are process-critical. The scenarios below are limited to applications with documented industrial use. Each scenario includes compliance standards, addition ratio, downstream production process, and terminal finished products. Where plant-derived data for the specific HSHM fibre grade are limited, the limitation is disclosed rather than extrapolated.
In Hatschek-process fibre cement manufacture, HSHM PVA fibre is introduced into the aqueous suspension before the vat, with a production dosage of 1.0–2.0 vol% of the green composite, equivalent to 13–26 kg/m³ at a fibre density of 1.30 g/cm³. The fibre is pre-disintegrated at 0.5–1.0% consistency and passed through a screen with 0.8–1.2 mm slot width before the mixing chest. For external flat sheets, product compliance is evaluated under EN 12467:2012+A2:2018, ISO 8336:2017, and ASTM C1186-22; production quality control typically includes wet/dry cycle testing and boiling-water dimension measurements to confirm fibre-cement bond stability.
In the Hatschek line, total slurry solids are held at 25–40 g/L, and felt line speed is set between 90 m/min and 130 m/min. Single films of 0.3–0.6 mm are transferred to the forming roll until the specified sheet thickness is reached; green sheets are then cold-pressed at 10–15 MPa and autoclaved at 170–180 °C under saturated steam at 0.8–1.0 MPa. Fibre opening quality controls batch consistency: bales stored above 65% RH can exhibit moisture regain near 5.0%, producing screw-feeder bridging, so pre-opened fibre is stored in sealed hoppers below 65% RH. Terminal products include exterior architectural cladding panels, ventilated façade boards, soffit panels, and backer board substrates for ceramic or polymer finishes. The lower addition limit is used for sheets below 4.5 mm thickness to preserve interlaminar strength; the upper limit is reserved for impact-exposed cladding.
Production-scale engineered cementitious composites using HSHM PVA fibre are designed around a fibre volume fraction of 2.0 vol%, or 26 kg/m³, to obtain strain-hardening response instead of single-crack strain softening. The transition is governed by fibre volume fraction, matrix fracture toughness, and fibre–matrix interfacial bond; below 1.5 vol% the strain-hardening margin disappears, and above 2.2 vol% mixer torque rises sharply and fibre clumping raises fresh-state air content. Flexural performance is evaluated under ASTM C1609/C1609M-19a, while flexural toughness is additionally checked against JSCE-SF4:1984; direct uniaxial tension testing is required for design qualification because flexural beam results can overstate crack-control capacity.
Mixing is performed in a forced-action pan mixer at 20–30 rpm, with fine aggregate limited to 0.6 mm maximum size. Water and polycarboxylate superplasticizer are combined to maintain a mini-slump of 180–220 mm at a water-binder ratio no higher than 0.25; HSHM PVA fibre is added last over 60–90 s to prevent fibre balling. After mixing, the fresh composite is transported within 45 min at ambient temperature below 30 °C and placed without vibration by low-pressure pumping or trowelling. Curing is maintained with wet burlap and polyethylene sheeting for at least 7 days. Terminal products include seismic coupling beams in shear-wall buildings, bridge deck link slabs, dam spillway repair mortars, and high-deformation connection strips. Published data for this specific HSHM fibre configuration in ECC is limited; the 2.0 vol% dosage is the established PVA-ECC reference value and requires plant-scale tensile qualification. When unwashed silica sand with high methylene-blue adsorption is used, the superplasticizer demand may need an additional 0.1–0.3% by binder mass to maintain the same flow without increasing the water-binder ratio above 0.25.
Resorcinol-formaldehyde-latex treated HSHM PVA chopped fibre is used in rubber mechanical goods as a short-fibre reinforcement, with a typical addition of 3–10 phr depending on the base elastomer and required anisotropy. A fibre length of 6 mm is common for calendered sheet compounds, while 3 mm fibre is preferred for injection-moulded articles to reduce flow-induced orientation defects. Mixing is conducted according to ASTM D3182-21a; vulcanised tensile properties are tested under ISO 37:2017, abrasion resistance under ISO 4649:2022, and finished conveyor belts under ISO 14890:2013.
In production mixing, the chopped fibre is added late in the internal mixer cycle after carbon black and plasticiser incorporation, when batch temperature is between 75 °C and 95 °C, to minimise fibre breakage. The compound is sheeted on a two-roll mill at 50–60 °C with a nip of 5–8 mm; repeated mill passes orient the fibre along the machine direction. Calendering at 0.3–0.8 mm thickness locks in the orientation and creates anisotropic stiffness. Dosages above 10 phr frequently produce reduced tack and edge-cracking on the calender; this is a documented production bottleneck when fibre dispersion is incomplete. Vulcanisation is performed at 150–170 °C and 15–20 MPa. Extended cure cycles above 180 °C are not recommended because fibre dimensional relaxation can reduce reinforcement efficiency.
Terminal products include V-ribbed belts, industrial hose cover compounds, conveyor belt covers, and cut-resistant rubber sheet for high-friction flooring. Published technical data for this specific HSHM fibre in rubber compounds are less extensive than for cementitious systems; the stated dosage range is aligned with general PVA short-fibre rubber practice and should be confirmed through plant-scale mixing trials.
Wet-mix sprayed concrete containing HSHM PVA fibre is batched at 0.30–1.0 vol%, equivalent to 4–13 kg/m³, to provide plastic shrinkage crack control and post-crack energy absorption in temporary and permanent tunnel linings. Compliance is evaluated under EN 14487-1:2005 for specification and execution of sprayed concrete, and EN 14488-3:2006 for flexural performance of fibre-reinforced sprayed concrete. The fibre is added at the batching plant in pre-weighed dissolvable bags or through a calibrated silo screw, and the mixing time is extended by 15–30 s compared with plain shotcrete.
The mix is delivered by positive-displacement pump through a 50–65 mm hose at 4–8 m³/h; compressed air at 7–9 bar is introduced at the nozzle. Because HSHM PVA fibre is low-density, in-situ hardened fibre content after spraying is lower than the batch content due to rebound; plant calibration therefore targets the upper dosage limit when the specification is based on core extraction. Terminal products include permanent single-shell tunnel linings, temporary support layers, slope stabilisation, and fire-damage repair sections. The operational window is bounded by free-water content: above 0.45 water-cement ratio, fibre rebound increases and substrate adhesion falls; below 0.35, pump pressure can become unstable.
At dry-mix plants producing thin-bed cementitious adhesives and repair compounds, HSHM PVA chopped fibre is incorporated into the powder blend at 0.05–0.15 vol% of the fresh mortar volume, corresponding to 0.65–1.95 kg/m³; the lower dosage is typical for large-format tile adhesives, and the upper for structural repair mortars. The dry blending uses a low-shear ribbon or ploughshare mixer at 30–60 rpm for 10–15 min; fibre is added after silica sand and cement but before redispersible polymer powder to prevent agglomeration. Compliance for tile adhesives is assessed under EN 12004:2017; structural repair mortars are tested under EN 1504-3:2006. On site, the dry mortar is mixed with water using a low-speed paddle mixer at 300–500 rpm for 3–5 min and applied as a thin bed. Terminal products include C2-class large-format tile adhesives, R-class concrete spall repair mortars, and pourable self-levelling toppings. Because the fibre is water-resistant, no pre-wetting is required; however, dry blend stored above 70% RH may show a shift in water demand of less than 1.0% due to fibre moisture pickup.
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Fujian Fuwei HSHM PVA Fiber is a high-orientation, acetalized polyvinyl alcohol monofilament produced for reinforcement of cementitious matrices, fiber cement sheets, shotcrete, and high-tenacity technical textiles. The manufacturer’s model nomenclature distinguishes the HSHM grade from conventional textile-grade Vinylon through the high-strength, high-modulus prefix; cut-length variants documented in technical literature include 6 mm, 9 mm, 12 mm, and 18 mm, with additional surface-treatment suffix codes where a dispersing agent is applied. The filament is round in cross-section with a nominal diameter of 14–18 µm and a linear density of 1.2–1.5 dtex. Published manufacturer data place the dry tensile strength between 1100 MPa and 1400 MPa and the initial tensile modulus between 28 GPa and 36 GPa when tested according to ASTM D3822/D3822M or ISO 5079. Elongation at break is 6–9%, and density is 1.28–1.30 g/cm³ per ISO 1183-1. The fibre retains polar hydroxyl groups after acetalization, which produces a stronger interphase with portland cement hydration products than unmodified polyolefin fibres.
The nominal specification profile is summarised below.
| Property | Nominal value | Test method |
|---|---|---|
| Density | 1.28–1.30 g/cm³ | ISO 1183-1 |
| Dry tensile strength | 1100–1400 MPa | ASTM D3822/D3822M, ISO 5079 |
| Initial tensile modulus | 28–36 GPa | ASTM D3822/D3822M, ISO 5079 |
| Elongation at break | 6–9% | ASTM D3822/D3822M |
| Linear density | 1.2–1.5 dtex | ISO 1973 |
| Cut lengths | 6 mm, 9 mm, 12 mm, 18 mm | Manufacturer lot inspection |
In continuous mixing operations for fiber cement board and wet-process shotcrete, HSHM PVA fibre is metered after aggregates but before the main water addition to encourage dry dispersion across the aggregate surface. Direct addition at rates up to 1.5 vol% is generally possible in pan mixers, while forced-action twin-shaft mixers can accommodate up to 2.0 vol% without pre-dispersion. Above 2.0 vol%, fibre balling and non-uniform distribution become process-limiting unless a dry pre-mix step and controlled moisture content below 5.5% are maintained. Production-scale mixing records for PVA-reinforced mortar frequently report a slump-flow reduction in the range 30–70 mm at 1.0 vol% fibre in a 0.42 w/c mortar when measured by EN 12350-8; the exact reduction depends on superplasticizer adsorption and aggregate grading. The plastic viscosity rise is most evident at low shear rates and should be evaluated on the production mixer rather than extrapolated from planetary laboratory mixers.
The HSHM grade is distinguished by a higher degree of molecular orientation and crystallinity achieved through elevated draw ratios during fibre formation. Conventional textile-grade PVA fibre typically exhibits a dry tensile strength of 600–800 MPa and an initial modulus of 10–15 GPa; the HSHM grade increases these values to 1100–1400 MPa and 28–36 GPa, while elongation at break drops from 12–20% to 6–9%. The acetalization step reduces hot-water sensitivity and preserves tensile properties after exposure to saturated calcium hydroxide solution. Published alkali-resistance testing on high-modulus PVA fibre commonly reports retained tensile strength above 90% after 28 days immersion in 1 mol/L NaOH at 20 °C. This retention is materially higher than that of unprotected E-glass and is one basis for specifying HSHM PVA in alkaline cement matrices.
The following comparison places HSHM PVA fibre against synthetic, glass, and steel fibre alternatives commonly used in cement-based products. Values are indicative ranges drawn from published fibre datasheets and standard test methods, not from a single production lot.
| Fibre type | Density | Tensile strength | Elastic modulus | Elongation at break | Alkali behaviour |
|---|---|---|---|---|---|
| HSHM PVA fibre | 1.28–1.30 g/cm³ | 1100–1400 MPa | 28–36 GPa | 6–9% | Retains above 90% strength after 28 d in 1 mol/L NaOH at 20 °C |
| Textile-grade PVA fibre | 1.28–1.30 g/cm³ | 600–800 MPa | 10–15 GPa | 12–20% | Similar chemistry but lower absolute strength and modulus |
| Polypropylene monofilament | 0.90–0.92 g/cm³ | 300–600 MPa | 1.5–10 GPa | 15–25% | Inert but hydrophobic; low cement bond |
| AR glass fibre | 2.60–2.70 g/cm³ | 1700 MPa | 72 GPa | 2.0–2.5% | Zirconia-modified but susceptible to mixing-induced damage |
| Hooked-end steel fibre | 7.85 g/cm³ | 1000–1400 MPa | 200 GPa | 1.5–4.0% | Passive but requires concrete cover against chloride corrosion |
The replacement of polypropylene monofilament with HSHM PVA fibre alters first-crack behaviour because the PVA fibre develops chemical and frictional bond with the cement hydration matrix. Polypropylene has a tensile modulus of 1.5–10 GPa, which is lower than that of HSHM PVA by a factor of roughly 3–20; under the same crack-opening displacement, the polypropylene fibre transfers less stress and permits wider first-crack openings. HSHM PVA fibre bridges microcracks at crack openings below 50 µm and transfers stress into the surrounding matrix through polar adsorption. Compared with AR glass, HSHM PVA fibre has a lower elastic modulus, 28–36 GPa versus 72 GPa, but higher elongation at break, 6–9% versus 2.0–2.5%, and lower density, 1.28–1.30 g/cm³ versus 2.60–2.70 g/cm³. It also resists mixing-induced fracture in forced-action mixers, whereas AR glass fibre is prone to length degradation and reduced reinforcement efficiency. Against hooked-end steel fibre, HSHM PVA provides a higher fibre count per unit volume at equivalent volume fraction due to its 14–18 µm diameter and 1.28–1.30 g/cm³ density; this raises post-crack flexural toughness in thin sections where steel fibre settlement and surface protrusion are production problems.
When specified for wet-process fibre cement board manufacturing, HSHM PVA fibre is typically added at 1.0–2.0 vol% of the wet furnish to improve flexural toughness after autoclave curing. The fibre disperses in the dilute slurry and is retained on the forming sieve; its hydrophilic surface reduces wash-out compared with low-modulus polypropylene fibre. End-product flexural strength values are matrix-level results, not fibre properties. Fibre cement flat sheets tested under ISO 8336:2017 or EN 12467:2012 commonly fall in the range of 8–14 MPa air-cured and 6–10 MPa saturated, depending on furnish composition, board density, and curing regime. The fibre is also used in high-performance repair mortars at 0.5–1.0 vol% to limit plastic settlement cracking and to provide residual tensile capacity after first crack.
Engineered cementitious composite formulations containing HSHM PVA fibre at 2.0 vol% have been characterised by tensile strain-hardening response. Published micromechanical data report ultimate tensile strain in the range 3–5% and average crack width below 60 µm for properly tuned matrices. The measured fibre–matrix chemical debonding energy is typically 1.5–2.5 J/m², and frictional sliding stress is 2–4 MPa in standard ECC mortar; these values vary with fly ash replacement, water-to-binder ratio, and curing age. The critical fibre volume fraction for saturated multiple cracking in such matrices is approximately 1.0–1.5 vol%. Below that volume fraction, strain hardening may not be achieved, and the composite should not be specified for structural tensile ductility without confirmation testing.
Material certification for each production lot includes tensile strength, modulus, elongation, cut-length distribution, and moisture content. The fibre is supplied with declarations covering EN 14889-2:2006 for polymer fibres for structural concrete and ASTM C1116/C1116M-10a Type III synthetic fibre-reinforced concrete. For fibre-cement flat sheets, end-product performance is evaluated under ISO 8336:2017 or EN 12467:2012; the fibre alone is not a substitute for board-level flexural and durability testing. Hazardous substance screening is available under REACH and RoHS Directive 2011/65/EU.
Storage should be maintained at 5–35 °C and ≤ 60% RH in original packaging. Prolonged exposure above 80% RH can raise surface moisture and reduce dry-metering consistency. Continuous service above 200 °C is not recommended because thermo-oxidative degradation of the PVA backbone accelerates. In decorative panels, strong oxidising acid etchants below pH 2 and prolonged contact with concentrated hydrogen peroxide should be avoided unless validated on production boards. Published data for long-term UV exposure of exposed PVA fibre in exterior applications is limited; therefore, the fibre is generally specified in matrix-covered or coated sections rather than as a direct exposed surface.
