| HS Code | 846926 |
| Product Name | Adfil Sinta 6 mm (SINTA 6 mm) - Monofilament Polypropylene Fiber |
| Material | 100% virgin polypropylene |
| Fiber Type | Monofilament |
| Length | 6 mm |
| Diameter | Approximately 0.018 mm |
| Aspect Ratio | Approximately 333 |
| Specific Gravity | 0.91 g/cm³ |
| Tensile Strength | Approximately 400 MPa |
| Elastic Modulus | Approximately 3500 MPa |
| Melting Point | Approximately 160-170 °C |
| Ignition Point | Approximately 360 °C |
| Alkali Resistance | High |
| Acid Resistance | High |
| Water Absorption | Negligible |
| Thermal Conductivity | Low |
| Electrical Conductivity | Low |
| Dosage | 0.6-1.8 kg/m³ |
As an accredited Adfil Sinta 6 mm (SINTA 6 mm) - Monofilament Polypropylene Fiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Adfil Sinta 6 mm is supplied in 20 kg moisture-resistant paper sacks, with water-soluble inner bags for convenient dosing. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Adfil Sinta 6 mm monofilament polypropylene fiber, securely palletized and stowed for efficient, safe transport. |
| Shipping | Adfil Sinta 6 mm monofilament polypropylene fiber is shipped as a non-hazardous, non-regulated material. It is supplied in sealed bags or cartons, palletized and shrink-wrapped for protection. Transport in clean, dry vehicles or containers. Store indoors, away from moisture, direct sunlight, and sharp objects. No special temperature control required. |
| Storage | Store Adfil Sinta 6 mm (SINTA 6 mm) monofilament polypropylene fiber indoors in a cool, dry, well-ventilated warehouse, away from direct sunlight, moisture, heat, and ignition sources. Keep original packaging sealed on pallets off the floor. Avoid crushing, excessive stacking, and contamination. Maintain stable temperature and low humidity. Protect from UV degradation. Shelf life typically 24 months when stored properly. |
| Shelf Life | Shelf life: Indefinite when stored dry, in original unopened packaging, away from moisture, direct sunlight, and contamination. |
In ready-mixed concrete for interior slabs on grade, Adfil Sinta 6 mm is introduced through the truck-mixer charging hopper or aggregate conveyor at 0.6–0.9 kg/m³ for plastic shrinkage crack control; when evaporation rate exceeds 0.5 kg/m²/h or when the slab is placed in high-airflow curing environments, the dosage is increased to 0.9–1.2 kg/m³ only after trial mix validation according to ASTM C1579 restrained plastic shrinkage testing. Under EN 14889-2:2006 Class I polymer fibres and ASTM C1116/C1116M Type III synthetic fibre-reinforced concrete, the fibre component is specified by cut length, monofilament geometry, and alkali resistance rather than by tensile strength alone. In truck mixers of 6–9 m³ capacity, charging follows 70–80% of mixing water and 5–7 minutes of agitation at 12–18 rpm drum speed; visual acceptance criteria at discharge include fewer than 3 fibre balls per 1 m³ when the load is inspected on a 300 mm slump wedge. Laser screed placement and closure with ride-on power trowels using 900–1200 mm pan blades create the main process conflict: monofilament fibres exposed at the surface during final trowel pass generate fuzz if the blade is tilted above 10° while bleed water has dropped below 0.25 mm surface sheen, so finishers must adjust timing and avoid overworking. Terminal product types include warehouse floors, logistics hubs, cold rooms, maintenance hardstandings, and basement slabs, where the fibre is secondary reinforcement against early-age plastic shrinkage cracking and does not replace steel fabric for structural crack-width control under EN 1992-1-1 or ACI 360R.
Automated vibratory block and paver presses operating at cycle times below 12 seconds and compaction forces of 80–120 kN require zero-slump mixes in which Adfil Sinta 6 mm is metered at 0.6–1.2 kg/m³, the lower bound being directed to face mixes and the upper bound to backing mixes or coarse-textured paving units. The applicable compliance set includes EN 1338:2003 for concrete paving blocks, EN 1339:2003 for concrete paving flags, and ASTM C936 for solid interlocking concrete paving units; absorption and compressive strength are verified through ASTM C140/C140M, and the fibre addition does not alter mix proportioning beyond the tolerances permitted by the product standard. Production takes place in planetary counter-current or pan mixers of 750–1500 L, with a post-fibre mixing interval of not less than 90 seconds at 18–24 rpm to distribute the monofilament into the dry-cast ribbon before feed to the paver machine. The mix is discharged into a paver hopper, vibrated under 50–65 Hz external vibration, pressed by hydraulic compaction, and immediately demoulded onto steel production boards; fibre clumping at the ribbon edges is checked at each shift using a 500 mm width sampling gate. Terminal product types include interlocking concrete pavers, segmental retaining wall units, curbstones, and hollow masonry units, where the 6 mm monofilament reduces edge chipping and demoulding fractures but is not intended to increase post-crack flexural strength.
In wet-mix sprayed concrete for temporary tunnel linings and slope stabilization, Adfil Sinta 6 mm is added at 1.0–2.0 kg/m³; published data for this specific product configuration in high-alkali accelerator environments is limited, so the upper bound should be confirmed by site trials to avoid fibre balling at the nozzle. Sprayed concrete containing the fibre is placed under EN 14487-1:2005 and the EFNARC European Specification for Sprayed Concrete, while the fibre component is specified by EN 14889-2:2006 Class I polymer fibres; North American projects may additionally reference ACI 506R and ASTM C1116/C1116M Type III synthetic fibre-reinforced concrete. Production equipment consists of a wet-mix piston pump with S-valve and 50–65 mm delivery line, or a rotor-stator pump rated to 20–30 bar concrete pressure, with liquid alkali-free accelerator dosed at 4–8% by weight of cement through a separate ring manifold at the nozzle. The fibre length is close to the critical dimension for pumpability; pressure spikes above 60 bar in 65 mm reduced-diameter lines indicate that the fibre is bridging the S-valve or nozzle orifice. Rebound is measured by spraying onto vertical steel panels for 3–5 seconds and weighing the rebound recovered on plastic sheeting; the 6 mm monofilament contributes to cohesion and reduces material rebound, but it does not provide structural toughness equivalent to steel fibre or macrosynthetic fibre at lengths above 30 mm. Terminal product types include temporary tunnel support linings, rock slope protection layers, retaining wall facings, and canal repair linings.
Rotor–stator pump systems with a 6 mm rotor-stator gap and 25 mm internal diameter hoses require tight control when Adfil Sinta 6 mm is incorporated into self-smoothing cementitious underlayments at 0.5–1.0 kg/m³; the maximum practical dosage is determined not by crack-control performance but by passage through the stator, where fibres longer than the slot depth can accumulate and raise pump pressure from a baseline of 8–12 bar to above 25 bar. Compliance is assessed under EN 13813:2002 for screed material and in situ floorings, with EN 14889-2:2006 applying to the fibre component; products intended for fast-track areas may also require ASTM F710 substrate preparation compliance. The production process involves high-shear mixing at 450–700 rpm for 90–120 seconds, then pump application at 2–4 mm thickness for existing concrete and 6–20 mm for renovation screeds; if the mix is applied by gauge rake and spiked roller, the roller diameter must be above 450 mm and rolling speed below 15 m/min to avoid dragging fibres to the surface. Terminal product types include residential renovation screeds, commercial floor leveling layers under LVT and vinyl sheet, and underfloor heating encapsulations, where the 6 mm fibre distributes plastic settlement stress but remains below the surface sealing line.
For hand-applied patch repair, Adfil Sinta 6 mm is incorporated into polymer-modified cementitious repair mortars at 0.6–1.0 kg/m³; spray-applied repair mortar formulations may reach 1.2 kg/m³ only after validation by wedge-splitting or restrained ring tests. Materials conforming to EN 1504-3:2005 Class R3 or R4 for structural repair must also demonstrate compatibility with the substrate under EN 1504-7:2006, while North American packaged repair products are tested to ASTM C928/C928M. In a forced-action mixer of 100–250 L capacity, the fibre is dry-blended for 60 seconds before water addition, then mixed under vacuum at 300–450 rpm to avoid air entrapment above 3%. Application by steel trowel on pre-wetted concrete substrates with roughness class ICRI CSP 3–5 proceeds in lifts of 12–25 mm for vertical patches; water-to-powder ratios between 0.12 and 0.16 require the fibre dispersion to be complete before polymer redispersible powder hydration raises viscosity. Terminal product types include bridge deck repair patches, balcony edge replacements, car park soffit patches, and precast element cosmetic repair, where the 6 mm monofilament limits early-age surface cracking but the system remains dependent on the substrate primer and curing membrane for long-term durability.
Self-compacting concrete for architectural precast panels and facade elements can receive Adfil Sinta 6 mm at 0.6–1.0 kg/m³, provided the fibre is added in the central mixer after the first 60% of water and superplasticizer has been incorporated; higher addition rates in SCC above 1.2 kg/m³ may reduce slump flow below 650 mm and require an increase in high-range water reducer dosage of 0.1–0.3% by cement weight. The precast element design references EN 14992:2007 for precast wall elements and ASTM C173/C173M for fresh concrete air content by volumetric method, while the fibre component is specified by EN 14889-2:2006 Class I polymer fibres. The production sequence uses stationary or truck mixers with external clamp-on vibrators operating at 3000–6000 vpm during casting into steel or polyurethane molds, followed by curing at 40–60°C for 8–16 hours before demoulding; fibre clumping is inspected under 500–1000 lux light on the cosmetic face after form release. Terminal product types include architectural facade panels, interior reception elements, precast window surrounds, and lightweight furniture-grade concrete components, where the 6 mm monofilament functions as plastic-state crack reduction but does not alter the visual smoothness if the form face is vibrated correctly.
When dry-cast pipe machines use vertical vibration or radial press compaction at cycle times of 3–8 minutes per pipe, Adfil Sinta 6 mm is metered at 0.6–1.0 kg/m³ to reduce early-age cracking during demoulding and steam curing. The compliance framework for the finished units includes ASTM C76 for reinforced concrete culvert, storm drain, and sewer pipe, EN 1916:2002 for concrete pipes and fittings, and EN 14889-2:2006 for the fibre. The production process loads the fibre into a planetary mixer of 500–1500 L, after which the zero- to low-slump mix is transferred to a vertical vibratory pipe machine operating at 40–55 Hz or a radial press with 150–250 kN compaction force; the mould is then lifted and the green pipe is moved to a steam-curing chamber at 45–65°C for 12–24 hours. Terminal product types include storm sewers, drainage culverts, jacking pipes, and box culvert sections, where the fibre helps maintain edge integrity at pipe joints during stockyard handling but does not replace steel reinforcement required by the pipe class under ASTM C76 or EN 1916:2002.
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Adfil Sinta 6 mm (SINTA 6 mm) – Monofilament Polypropylene Fiber is a synthetic micro-fiber for cementitious matrices, manufactured from virgin polypropylene monofilament. The product is classified under EN 14889-2:2006 as a class Ia micro-synthetic fiber for use in concrete, mortar, and screed. The nominal fiber length is 6 mm, the nominal diameter is 0.018 mm, and the typical reference dosage for plastic shrinkage crack control is 0.9 kg/m³. The fiber is added directly into batch or continuous mixing equipment; package mass should be recorded on the batch sheet because delivered fiber count depends on bag accuracy. The primary function is reduction of plastic shrinkage cracking before initial set, not post-crack structural load transfer.
The following nominal values are taken from manufacturer technical literature and are used for mix design screening. Lot-specific certificates should be reviewed before acceptance because single-filament tensile testing is sensitive to gauge length and strain rate.
| Parameter | Value | Reference standard or method |
|---|---|---|
| Polymer type | Virgin polypropylene monofilament | — |
| Nominal length | 6 mm | EN 14889-2:2006 |
| Nominal diameter | 0.018 mm (18 µm) | Manufacturer optical microscopy |
| Specific gravity | 0.91 g/cm³ | ISO 1183-1:2019 |
| Tensile strength | 400 MPa | Manufacturer single-filament test |
| Young’s modulus | 3.5 GPa | Manufacturer single-filament test |
| Melt temperature | 160–170 °C | ISO 11357-3:2018 |
| Water absorption | 0 % by mass after 24 h immersion | ASTM D570-22 |
| Alkali resistance | Inert in saturated calcium hydroxide solution at 20 °C | Manufacturer exposure data |
| Typical dosage | 0.6–1.0 kg/m³; standard reference dosage 0.9 kg/m³ | EN 14889-2:2006 declaration of performance |
The specific gravity of 0.91 g/cm³ means the fiber addition is negligible in mass terms. At a reference dosage of 0.9 kg/m³ in a concrete with fresh density of 2,400 kg/m³, the fiber mass fraction is approximately 0.04 % by mass. One kilogram of SINTA 6 mm corresponds to approximately 720 × 106 individual filaments, calculated from the nominal diameter and length under the assumption of a cylindrical monofilament cross-section. This filament count is substantially higher than that of coarser synthetic fibers and explains the product’s influence on microcrack formation in fresh mortar and concrete. The calculated value is nominal; manufacturing diameter variation is controlled under ISO 9001:2015, but lot-specific inspection should verify filament count when the product is used in critical plastic-shrinkage applications.
Plastic shrinkage cracking initiates when surface evaporation exceeds the bleed-water supply, generating capillary tensile stress in the top layer of fresh concrete. The fine, distributed monofilaments of SINTA 6 mm place a bridging phase within this stressed layer. Because the fiber length of 6 mm is larger than typical initial crack openings and the tensile modulus is 3.5 GPa, the filaments resist crack widening during the plastic period. Crack-control performance is evaluated under restrained-shrinkage test methods such as ASTM C1579-21. Project-specific testing remains necessary because cement fineness, aggregate grading, evaporation demand, and finishing time alter the effective crack reduction obtained in different concrete compositions.
Hot-weather placement and high-evaporation finishing require additional measures. When evaporation rate exceeds 1.0 kg/m²/h, ACI 305.1-14 establishes that surface protection must be used. The fiber does not replace curing membranes, fogging, windbreaks, or wet burlap. Under these conditions, the fiber may reduce visible crack width but does not eliminate the moisture-loss mechanism. On production-scale slab placements, finishing operations should be kept as short as possible after fiber introduction to avoid disturbing the near-surface fiber network.
Dispersion of monofilament polypropylene fiber is controlled by mixer shear, charging sequence, and paste viscosity. Field observations from twin-shaft mixers with batch capacities above 2.0 m³ indicate that balling occurs when the fiber is discharged simultaneously with the main water supply before cement is dispersed. The preferred sequence is aggregate charging, dry fiber introduction, cement charging, and then water addition. In pan mixers used for screed, the fiber should be added to the aggregate phase and mixed for 30–45 s before water and cement slurry are introduced. When the water-to-binder ratio falls below 0.40, extended wet mixing of 60–90 s after final water addition is typically required; however, published data for this specific configuration is limited, and mixer trials should be performed. Worn mixing blades increase the risk of undispersed bundles. On production equipment, blade-to-pan clearances above 5 mm and heavily worn paddle tips have been associated with residual fiber clusters in stiff mortar.
Truck-mixer addition is possible when the drum is charged with aggregate and cement first. Bags should be introduced through the loading hopper, not thrown onto wet concrete after discharge has started. If fiber is added at the site, additional mixing of 5 min at high drum rotation is common, but final dispersion should be checked after discharge. Because polypropylene is less dense than water, the fiber may separate in highly fluid paste if mixing is inadequate. Cohesive mix designs with a minimum slump of 100 mm are therefore more tolerant of site addition than very wet or very stiff mixes.
Plastic viscosity and slump are altered by fiber addition. At 0.9 kg/m³, a slump reduction of 10–25 mm is frequently observed in concretes with initial slumps above 120 mm; the magnitude depends on aggregate shape and paste volume. The mix design should not compensate by adding batch water. Water-reducing admixtures conforming to EN 934-2:2009 or ASTM C494/C494M-19 should be adjusted in laboratory trials. For pumped concrete, the 6 mm fiber length is below the typical obstruction limit for standard pump lines; blockages are more commonly caused by fiber balling from poor charging than by fiber length itself. Field reports indicate that adding bags directly into the pump hopper should be avoided because residence time and shear in the hopper are insufficient for uniform distribution.
For machine-applied renders and screeds with maximum aggregate size 4 mm, the 6 mm filament length remains short enough to pass through standard rotor-stator pumps and screw conveyors without generating significant backpressure. In precast façade panels with exposed aggregate finishes, the fiber is typically dosed at 0.9 kg/m³ and does not alter the washed surface texture when retarding agent and washing timing are kept constant. Applications in self-leveling underlayments below 10 mm thickness should be validated because filaments can protrude if trowelling is delayed. The product is not recommended for thin overlays where the nominal fiber length exceeds one-third of the layer thickness without a site trial.
Dosage below 0.6 kg/m³ reduces the number of filaments per unit volume and may not provide the intended plastic shrinkage crack control in mortars with high cementitious paste content. The performance decline is progressive rather than an abrupt step-change; the crack reduction at a given dosage depends on restraint, evaporation demand, and setting time. A standard reference dosage of 0.9 kg/m³ is used in many specifications for slabs and precast elements. Increasing the dosage above 1.2 kg/m³ can produce measurable reductions in slump and increases in plastic viscosity. Such mixes should be adjusted with a water-reducing admixture conforming to EN 934-2:2009 or ASTM C494/C494M-19, not with batch water.
In cement-rich mortars with binder contents above 500 kg/m³, paste volume is generally sufficient to disperse the fiber, but clusters may remain if the mix is very stiff. Mortars with flow-table values below 140 mm according to EN 1015-3:1999 should be checked for visible fiber agglomerates after mixing. If clumping appears, pre-dispersion by adding fiber to the dry aggregate is more effective than extending wet mixing time. The interaction between monofilament polypropylene and air-entraining admixtures also requires trial calibration. The fiber does not create the air-void system specified in ASTM C260/C260M-20 or EN 934-2:2009. In laboratory trials, addition of 0.9 kg/m³ monofilament fiber may reduce measured fresh air content by 0.2–0.8 % because of changes in paste viscosity and bubble coalescence during vibration; however, published data for this specific fiber is limited. Air content should be checked using ASTM C231/C231M-22 or EN 12350-7:2019 when freeze-thaw resistance is specified.
Distinction from other fiber classes is necessary because the 6 mm monofilament polypropylene fiber acts primarily in the fresh state. The following comparative categories are based on generic material properties and should not replace product-specific testing for a given mix.
| Fiber class | Density | Tensile modulus | Corrosion in chloride environments | Primary action |
|---|---|---|---|---|
| SINTA 6 mm monofilament PP | 0.91 g/cm³ | 3.5 GPa | None | Plastic shrinkage crack reduction |
| Steel fiber | 7.85 g/cm³ | 210 GPa | Possible unless stainless | Post-crack flexural toughness |
| Alkali-resistant glass fiber | 2.68 g/cm³ | 72 GPa | None in alkali-resistant grade | Early-age shrinkage and some post-crack control |
| Fibrillated polypropylene fiber | 0.91 g/cm³ | 3.5 GPa | None | Plastic shrinkage crack reduction |
Compared with macro-synthetic fibers of length 38–54 mm, SINTA 6 mm is not intended for structural residual flexural strength testing under EN 14651:2005+A1:2007 or ASTM C1609/C1609M-19a. Its length and filament count are optimized for fresh-state crack control, not for post-crack load-bearing capacity. If post-crack toughness is required, a macro-synthetic or steel fiber should be specified separately. The lower tensile modulus of polypropylene compared with steel means that hardened concrete carrying structural loads will not benefit from this fiber after matrix cracking. The fiber acts before and during early setting while the paste still undergoes capillary stress development.
Fibrillated polypropylene products have the same polymer density but start as film tapes that open into net-like structures. They can have a lower filament count per kilogram and require shear to fibrillate adequately. Monofilament SINTA 6 mm has a defined circular cross-section and a consistent length distribution, which reduces the tendency to form visible fiber balls in pump lines and hoses. Published data comparing SINTA 6 mm directly with all fibrillated grades is limited; selection between monofilament and fibrillated forms should be made by trial mixing and crack-control testing under the intended placement conditions.
In high-strength concrete subject to fire, polypropylene monofilament fibers of similar diameter have been used at dosages of 2.0–3.0 kg/m³ to create microchannels during melting and reduce explosive spalling under ISO 834-1:1999 exposure. At the lower dosage of 0.9 kg/m³ intended for plastic shrinkage control, SINTA 6 mm should not be assigned a passive fire-protection function unless specific fire test data confirms otherwise. The fiber softens near 160 °C and leaves no corrosion residue; the molten polymer is not a cementitious binder and should not be considered a substitute for polypropylene fiber grades designed for fire resistance.
Storage and receiving require mechanical and visual inspection. The product should be stored in dry conditions below 40 °C and away from strong oxidizing agents. Polypropylene in as-supplied form is not classified as hazardous under Regulation (EC) No 1272/2008. The product is not intended for combination with amine-based admixtures that generate exothermic gel reactions, although published data on this specific chemical interaction is limited. Receiving inspection should verify bag weight, fiber length by caliper, and absence of visible wetting or compression lumps. Quality control records should include the batch number, mixer type, charging sequence, and observed slump before and after fiber addition.
