| HS Code | 226781 |
| Product | Kuraray KURALON 55O1 PVA Filament Fiber |
| Polymer | Polyvinyl Alcohol (PVA) |
| Fiber Form | Continuous filament yarn |
| Specific Gravity | 1.30 g/cm³ |
| Tenacity Dry | 12.0 g/den |
| Elongation At Break Dry | 6.5% |
| Initial Modulus | 310 g/den |
| Moisture Regain 20 C 65 Rh | 4.0% |
| Melting Point | 220°C (decomposes) |
| Hot Air Shrinkage 180 C | ≤ 3% |
| Boiling Water Shrinkage | ≤ 1% |
| Acid Resistance | Good in dilute acids; limited in concentrated mineral acids |
| Alkali Resistance | Excellent in weak alkalis |
| Solvent Resistance | Resistant to common organic solvents and oils |
| Biological Resistance | Resistant to mildew, bacteria, and insects |
| Uv Resistance | Good |
As an accredited Kuraray KURALON 55O1-PVA Filament Fiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Kuraray KURALON 55O1-PVA filament fiber is supplied in 20 kg bales, shrink-wrapped and palletized for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL loading of Kuraray KURALON 55O1 PVA filament fiber: palletized cartons securely stowed, moisture-protected, stable, and free from cargo shifting during transit. |
| Shipping | Ship as non-hazardous polyvinyl alcohol filament fiber. Pack in dry, sealed cartons or bales on pallets, protected from moisture and contamination. Use clean, ventilated containers; avoid compression, direct sunlight, and heat sources. No dangerous-goods declaration required under normal dry conditions, but comply with all applicable transport regulations. |
| Storage | Store KURALON 55O1-PVA filament fiber in a cool, dry, well-ventilated area, protected from direct sunlight and moisture. Keep in original sealed packaging or on clean, dry pallets to prevent water absorption, contamination, or mechanical damage. Avoid high humidity and condensation; maintain moderate temperature. Handle with care to preserve fiber integrity and performance. |
| Shelf Life | Store in a cool, dry place away from moisture and sunlight. Shelf life is typically 2–3 years. |
Slurry dewatering behaviour on a Hatschek machine shifts when KURALON 55O1-PVA filament fiber is introduced as a partial replacement for refined cellulose pulp in non-asbestos fiber-cement sheet formulations. The filament is typically cut to 6 mm or 12 mm and dosed at 0.8–2.2 vol% of total furnish solids. Bagged filament should be stored below 65% RH before batching; moisture regain above 5 wt% alters the dry solids proportion in the furnish. Inline rotary cutting and forced-air feeding reduce filament entanglement during hydro-pulper dispersion; the PVA filament enters the mixing chest after pulp refining has reached 30–45 °SR Schopper-Riegler freeness. Because the PVA filament does not fibrillate like refined pulp, the furnish drainage rate changes relative to an all-cellulose reference stock. On production-scale Hatschek lines, vacuum box retention must be increased by 10–20% when the PVA dosage reaches 2.0 vol% to maintain a single-layer sheet thickness of 0.9–1.1 mm before stacking. The green sheet is transferred from the felt to a forming roll, cut to panel dimensions, and autoclaved at 170–180 °C under saturated steam for 8–12 h when silica sand and cementitious binders are used. Compliance for the finished board is evaluated against EN 12467:2012+A2:2018 and ISO 8336:2017, with flexural strength, impact resistance, and dimensional stability classified according to the specified NT category. The terminal output comprises ventilated façade panels, soffit boards, and corrugated roofing profiles. Operating boundary data indicate that PVA dosage above 2.5 vol% can reduce green sheet cohesion and increase lamination defects at the forming roll, because unbound water trapped between non-fibrillated filaments impedes interlayer bonding.
In cast engineered cementitious composites, KURALON 55O1-PVA filament fiber is normally added at 2.0 vol% of the total mortar volume, corresponding to approximately 26 kg/m³ for a filament density of 1.30 g/cm³. The mix design typically pairs the fiber with Type I Portland cement, Class F fly ash at a 1.2–1.4 fly ash-to-cement mass ratio, silica sand with maximum aggregate size 0.3 mm, and polycarboxylate ether superplasticizer at 0.4–0.8 wt% of cementitious mass. The primary dosage restriction is interfacial bond saturation: uncoated PVA filament forms strong chemical adhesion to cement hydrates, so crack openings below 250 µm can trigger fiber rupture before pullout, shifting the composite from multiple micro-cracking toward localized fracture. To extend strain capacity, the filament may be specified with a controlled surface oiling agent, or the matrix may be adjusted with additional supplementary cementitious material to reduce interfacial toughness. Batching is performed in a high-shear planetary mixer; dry ingredients are blended for 2 min, water and superplasticizer are added, and the filament is introduced into the wet mortar at slow speed for 2–3 min to avoid clumping. Specimens cured at 20 °C and 95% RH are tested under ASTM C1609/C1609M four-point flexural loading. Fiber-reinforced concrete specification compliance is referenced to ASTM C1116/C1116M Type III synthetic fiber reinforcement. Terminal components include seismic coupling beams, bridge deck link slabs, and patch repair overlays with maximum aggregate size below 1 mm.
| Application track | Standard designation | Verification parameter | Role of KURALON 55O1-PVA filament |
|---|---|---|---|
| Fiber-cement façade sheet | EN 12467:2012+A2:2018 | Bending strength class, impact resistance | Crack control and autoclave dimensional stability |
| Cast ECC | ASTM C1609/C1609M | Flexural toughness parameters at specified net deflections | Multiple micro-cracking and strain hardening |
| Marine ropes | ISO 2307:2019 | Breaking load, elongation at break | Wet strength retention and abrasion resistance |
| Tunnel shotcrete | EN 14487-1:2022 | Energy absorption class, residual strength | Rebound reduction and early crack control |
| Textile scrim | ETAG 004:2013 | Alkali ageing, tensile retention | Load-bearing mesh under alkaline base coat |
| Industrial sewing thread | ISO 2062:2009, ISO 4915 | Breaking force, seam type | Loop strength and alkaline dust resistance |
Wet strength retention of braided KURALON 55O1-PVA filament lines under continuous seawater immersion is the primary selection criterion for aquaculture cage netting and longline rope applications. The filament is processed into three-strand twisted or eight-strand braided ropes with rope diameters from 6 mm to 24 mm, depending on cage collar tension and current loading. Unlike polyethylene or polyamide, the high-tenacity PVA filament does not soften at standard seawater temperatures and retains 80–90% of its dry tensile breaking load when wet; specific retention values depend on rope construction and the filament saponification degree. Heat-setting at 120–140 °C is applied to control filament shrinkage during service. Compliance testing for the finished rope follows ISO 2307:2019 for breaking load and elongation at break, with wet conditioning and cyclic loading protocols developed by rope producers for marine certification bodies. Terminal products include aquaculture cage netting lacing, mussel longline ropes, and short-run mooring hawsers where low elongation and high abrasion resistance are required. The operational boundary is defined by continuous service in seawater above 35 °C under sustained cyclic loading; published data for this specific configuration is limited, and accelerated aging trials should be conducted before deployment in high-current tropical sites.
When KURALON 55O1-PVA filament is dosed at 0.5–1.0 vol% in wet-mix shotcrete for temporary tunnel linings, the main process change is the elimination of steel fibre balling at the nozzle and a measurable reduction in rebound. The filament is cut to 12 mm or 18 mm before entering the agitator truck; the dry premix contains cement, aggregates up to 8 mm, silica fume at 4–8 wt% of cementitious mass, and high-range water reducer. At the nozzle, compressed air at 4–6 bar projects the mix onto the substrate, and the PVA filament tends to orient parallel to the surface, improving early-age crack control. The target slump before transport is 180–220 mm to maintain filament dispersion without segregation. Sprayed concrete specification is verified under EN 14487-1:2022, and the fiber reinforcement contribution is assessed through energy absorption panels and residual strength classes referenced in the relevant European or national sprayed concrete provisions. The terminal application includes transition zones between drill-and-blast headings and cast-in-place concrete liners, plus temporary slope stabilization shells. The operational limit is the maximum dosage of 1.0 vol%; above this level, pump pressure increases measurably and nozzle pulsation creates surface roughness and rebound variation on production-scale tunnel units.
KURALON 55O1-PVA filament can be converted into woven or Raschel-knitted scrim fabrics for external thermal insulation composite systems and render carrier meshes. The scrim is produced with mesh openings of 6 mm × 6 mm to 10 mm × 10 mm and filament counts from 200 dtex to 600 dtex. Because the PVA filament retains tensile strength in the alkaline environment of cementitious base coats at pH 12–13, the scrim does not require the latex or epoxy coating commonly used on glass-fibre meshes for alkali protection. The scrim is embedded into a 3–5 mm cementitious base coat at a coverage rate of 1.2–1.5 kg/m²; pull-out and interface shear resistance are governed by mesh aperture and embedment depth. Mechanical performance is evaluated under ETAG 004:2013 procedures for EIFS base coat reinforcement, including alkali ageing followed by tensile strength retention testing. Terminal finished products include exterior façade reinforcement mesh, plaster carrier fabric, and corner reinforcement strips for window reveals. The processing boundary is the minimum embedment depth: scrim placed only on the surface or embedded below 3 mm exhibits reduced pull-out capacity and should not be used for structural crack bridging.
On high-speed bag-closing lines, KURALON 55O1-PVA filament is configured as a two-ply or three-ply sewing thread for cement sacks, mineral-filled bags, and chemical filter bag closures. The thread is produced from 200 dtex to 1000 dtex filament yarns with ply twist in the range 400–800 tpm, depending on needle size and seam strength requirements. The process sequence comprises precision winding, two-for-one twisting, heat-setting at 110–130 °C, and lubricant application to reduce needle friction. On production-scale bag-closing machines operating at 10–25 m/min, the PVA sewing thread maintains loop strength during high-speed needle insertion, while resisting the alkaline dust environment typical of cement bagging lines. Thread tensile testing follows ISO 2062:2009 for breaking force and elongation from packages; seam classification is defined under ISO 4915 for stitch type and seam configuration. Terminal finished products include cemented sack closures, mineral filler bag seams, and process filter bag assembly. The operational boundary is acid exposure: continuous contact with strong mineral acids at pH < 2 reduces the thread tensile strength, and acid-filled bag closures should be secured with alternative filament types.
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Among continuous synthetic reinforcement fibers, polyvinyl alcohol filaments occupy a narrow technical envelope between high-modulus regenerated cellulose, low-elongation polyester, and dimensionally stable para-aramid. Kuraray KURALON 55O1-PVA Filament Fiber is classified as a high-tenacity, low-elongation continuous polyvinyl alcohol filament produced by wet-spinning a polyvinyl alcohol dope, drawing the coagulated fiber, and applying acetalization and heat treatment to reduce water sensitivity. The product is supplied for technical weaving, braiding, hose reinforcement, belt construction, and load-bearing cementitious composite structures. Published manufacturer data for the 55O1 configuration identify reinforcing yarns in the linear density range of 1,100 dtex to 4,400 dtex, with breaking tenacity measured under ISO 2062 between 8.0 cN/dtex and 12.0 cN/dtex and elongation at break between 6% and 10%. The material is not a water-soluble PVA grade; it is a hot-water-resistant reinforcing filament intended for continuous load transfer in technical textiles.
The fiber is classified as a polyvinyl alcohol homopolymer yarn. The polymer backbone is derived from vinyl acetate polymerization followed by saponification, with the residual hydroxyl content and subsequent acetalization adjusted to control crystallinity, swelling, and adhesive interaction. In 55O1-PVA filament production, wet-spinning is combined with high-ratio drawing and heat treatment. The fiber does not exhibit a sharp melt-processing window, and therefore it is used as a continuous reinforcing textile rather than as a thermoplastic feed resin. Linear density, filament count, and twist are package-specific; industrial packages may include 1,100 dtex, 2,000 dtex, and 4,400 dtex continuous filament constructions. Density is reported near 1.26–1.30 g/cm³, and equilibrium moisture regain at 65% relative humidity and 20 °C is approximately 4.0–5.0%. The surface chemistry retains hydroxyl and acetal groups, which supports wetting and adhesion in phenolic, epoxy, and rubber matrices without automatic corona treatment in many converting operations.
During conversion of continuous PVA yarn into rubber hose reinforcement, braiding decks and spiral winding lines are the primary production equipment. At the hose braiding station, the yarn is tensioned to 0.5–1.5 cN/tex and wound onto carriers with controlled lay length. Processing guidance for high-tenacity PVA filament specifies pre-conditioning at 50–60 °C for 4–6 h when package storage humidity exceeds 60% RH, because surface moisture increases yarn-to-yarn friction and disturbs braiding tension stability. In braided hose jackets, the low elongation of 6–10% limits creep under internal pressure, while the polar PVA surface improves adhesion to resorcinol-formaldehyde-latex dips. The adhesion system must be co-cured with the rubber vulcanization kinetics; sulfur-cure systems at 150–160 °C are commonly used. Production trials on 24-carrier and 36-carrier braiders show that PVA filament may require lower pre-tension than equivalent polyester yarn at equal strain because its higher modulus generates higher load at low extension. Published data for burst-pressure retention after steam aging of PVA-reinforced hose jackets is limited and should be validated on production-diameter hose.
The primary distinction is continuous filament architecture. In staple grades, fiber length is typically 4–12 mm, requiring carding, needlepunching, or hydroentanglement to form a web. In 55O1-PVA, the reinforcing unit is a continuous multifilament yarn, allowing direct load transfer along the fiber axis and eliminating staple drafting and spinning loss. The filament form permits braiding, beaming, and high-speed weaving without the short-fiber orientation penalties encountered in spun yarns. When used in cementitious applications, high-tenacity PVA staple is dispersed into the matrix as individual fibers, whereas 55O1-PVA filament is inserted as aligned tows, scrims, or open-mesh fabrics. The continuous form reduces fiber-matrix pullout length and raises structural reinforcement efficiency in tensile zones, but it is not a direct substitution for short-fiber dosage in premix concrete.
Conditioning of test specimens to 20 °C and 65% RH is performed for 24 h before tensile testing under ISO 139. Wet-state tenacity of PVA filament is typically 70–80% of dry-state tenacity, and wet elongation may increase by 1–3 percentage points. This wet/dry ratio is used in geotextile and cementitious design because saturated service often governs reinforcement performance.
| Parameter | Representative high-tenacity PVA filament value | Test method / condition |
|---|---|---|
| Linear density | 1,100–4,400 dtex | ISO 1889:2009 |
| Tenacity at break | 8.0–12.0 cN/dtex | ISO 2062, 500 mm gauge, 250 mm/min |
| Elongation at break | 6–10% | ISO 2062 |
| Initial modulus | 220–370 cN/dtex | ASTM D2256 tangent modulus |
| Density | 1.26–1.30 g/cm³ | ISO 1183-1 |
| Equilibrium moisture regain | 4.0–5.0% | 65% RH, 20 °C |
Package-to-package variation in breaking force should be monitored with a moving range chart during quality release. Published quality limits for high-tenacity PVA yarn often accept a coefficient of variation for breaking tenacity below 3–5% within a beam, but exact limits for 55O1 must be confirmed with the manufacturer.
Polyester filament of equivalent linear density typically shows tenacity of 7.0–9.0 cN/dtex and elongation at break of 12–18%; 55O1-PVA shifts the balance toward lower elongation and higher modulus, which reduces strain at first crack in cement and rubber composites. Para-aramid filaments can exceed 18 cN/dtex and 60 GPa initial modulus, but their flex fatigue behavior in cyclic hose pressure pulses can require specific construction measures. The PVA filament offers intermediate stiffness with a density of 1.26–1.30 g/cm³, lower than polyester at 1.38 g/cm³ and higher than nylon at 1.14 g/cm³. Moisture regain of 4.0–5.0% is comparable to nylon 6,6 and substantially above polyester; this supports adhesive wetting but imposes drying controls in structural applications. Under exposure to saturated calcium hydroxide at 20–60 °C, high-tenacity PVA retains more strength than polyester and nylon, a property exploited in alkali-resistant cementitious reinforcement. The 55O1 filament does not match aramid dry-air high-temperature performance, and continuous service above 100 °C should be evaluated with creep and oxidative ageing data.
| Property | KURALON 55O1-PVA filament | High-tenacity PET | High-tenacity nylon 6,6 | Para-aramid |
|---|---|---|---|---|
| Tenacity at break | 8.0–12.0 cN/dtex | 7.0–9.0 cN/dtex | 7.5–9.5 cN/dtex | 18.0–25.0 cN/dtex |
| Elongation at break | 6–10% | 12–18% | 15–25% | 2.5–4.0% |
| Initial modulus | 220–370 cN/dtex | 90–120 cN/dtex | 40–70 cN/dtex | 400–600 cN/dtex |
| Density | 1.26–1.30 g/cm³ | 1.38 g/cm³ | 1.14 g/cm³ | 1.44 g/cm³ |
| Moisture regain | 4.0–5.0% | 0.4% | 4.0–4.5% | 3.5% |
Values are representative published selection data, not direct grade specifications for every titer or finish. The 55O1 datasheet may differ by linear density, twist, and surface finish. Para-aramid data are included for stiffness reference, not as a direct replacement schedule.
Production trials on 24-carrier and 36-carrier braiders show that PVA filament requires lower pre-tension than equivalent PET yarn because its higher modulus and lower elongation produce higher load at equal strain. Carrier tension of 0.8–1.2 cN/tex is typical; above 1.5 cN/tex, package unwinding friction can produce filament fuzzing at guide eyes. The yarn should be dip-coated with a resorcinol-formaldehyde-latex formulation adjusted to pH 9.0–10.5 and cured at 150–170 °C. In burst testing per SAE J517 or EN 853 equivalents, hoses reinforced with PVA 55O1 often show lower diametral growth under impulse, although published data for this specific configuration is limited. Mandrel adhesion and cover bonding are influenced by the acetalized surface; a post-braid scouring step at 70–80 °C with non-ionic surfactant is used in some lines to remove size before dipping.
For cementitious applications, 55O1-PVA filament is normally placed as a technical fabric rather than as short dispersed fiber. Open-mesh layouts with 10–50 mm grid spacing permit concrete penetration through the mesh and function as external reinforcement in thin-section panels. Load-bearing data are evaluated under three-point bending per EN 12467 or ASTM C947; comparative panels show post-cracking tensile response is influenced by yarn count and mesh spacing rather than by filament tenacity alone. The fiber’s alkali resistance makes it suitable for ordinary Portland cement matrices with pH 12.5–13.5, but direct ultraviolet exposure of unprotected fabric should be limited. High-tenacity PVA staple grades are often dosed at 0.5–2.0% by volume in short-fiber cementitious mixes; however, 55O1-PVA filament is a continuous reinforcement product and should not be dosed as loose fiber into a concrete mixer.
Package storage below 60% RH at 15–25 °C is recommended. If ambient relative humidity exceeds 60%, the yarn should be conditioned at 50–60 °C for 4–6 h before braiding or weaving to stabilize tension and prevent size blocking. The fiber is incompatible with concentrated oxidizing acids, and prolonged exposure to strongly acidic media below pH 3 at elevated temperature may reduce molecular weight. Prolonged dry heat above 150 °C should also be avoided; oxidative degradation on exposed surfaces can reduce tensile strength, particularly in forced-air ovens without inert gas. For rubber bonding, amine-based adhesion promoters should be avoided because residual alkaline amine species can accelerate PVA thermal degradation during curing above 160 °C. No melt processing is possible; the filament cannot be reprocessed as a thermoplastic and must be converted as a yarn or fabric.
Under regulatory compliance, Kuraray KURALON 55O1-PVA Filament Fiber is represented as an industrial article, not as a chemical preparation. The polyvinyl alcohol polymer substance is registered under REACH where applicable; the finished fiber may be evaluated under EU Regulation 1907/2006, Annex XVII and RoHS Directive 2011/65/EU for hazardous substances when used as a component in electrical or electronic equipment housings. Food-contact use must be confirmed against the manufacturer’s compliance statement for the specific grade and migration test requirements of FDA 21 CFR 177.1670 or applicable national rules. No food-contact suitability claim should be inferred from general industrial data. If the fiber is subjected to cutting, grinding, or high-energy dispersion, dust control should be maintained to occupational exposure limits for nuisance dust. PVA fiber is not classified as a respiratory sensitizer under CLP, but mechanical dust requires standard local exhaust ventilation.
Woven conveyor belts and timing belts subject the filament to cyclic flex fatigue, not simple tensile loading. On multi-ply belt constructions, PVA 55O1 is inserted in the tension plies because its low elongation reduces permanent belt growth; however, published data for this specific configuration is limited. Belt manufacturers typically evaluate dynamic performance under ISO 21181-1 for light conveyor belts or DIN 22102 for textile carcass belts, measuring elongation at break and troughability. PVA filament requires careful let-off tension control during weaving; warp tension above 1.5 cN/tex can increase yarn breaks because the filament has lower transverse toughness than nylon. In contrast to para-aramid, PVA filament may require more frequent guide-eye replacement when weaving high-density fabrics due to surface wear and size debris, but it avoids the brittle low-elongation failure mode that can occur with aramid in tight radius flex zones. This profile places 55O1-PVA between conventional polyester/nylon and aramid in stiffness and fatigue, while its polar surface assists rubber bonding.
