| HS Code | 716803 |
| Product Name | Adfil Sinta 48/18 (Syntec 48/18) - Monofilament Polypropylene Microfiber |
| Material | 100% virgin polypropylene |
| Fiber Type | Monofilament microfiber |
| Length | 48 mm |
| Equivalent Diameter | 18 microns |
| Aspect Ratio | 2667 |
| Specific Gravity | 0.91 |
| Density | 0.91 g/cm³ |
| Tensile Strength | >400 MPa |
| Young S Modulus | >3500 MPa |
| Melting Point | 160-170 °C |
| Ignition Point | >360 °C |
| Alkali Resistance | Excellent |
| Acid Resistance | Excellent |
| Water Absorption | Nil |
| Chemical Resistance | High |
| Electrical Conductivity | Low |
| Thermal Conductivity | Low |
| Recommended Dosage | 0.6-0.9 kg/m³ |
| Fiber Count Per Kg | Approximately 90 million |
| Color | Natural/white |
As an accredited Adfil Sinta 48/18 (Syntec 48/18) - Monofilament Polypropylene Microfiber factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in sealed 600 g bags, 20 bags per carton (12 kg total), labeled with product name and batch details. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): palletized Adfil Sinta 48/18 (Syntec 48/18) monofilament polypropylene microfiber, approx. 20–22 tonnes, secured and moisture-protected for export. |
| Shipping | Adfil Sinta 48/18 (Syntec 48/18) ships as a non-hazardous, non-flammable polypropylene microfiber, typically in 20 kg bags or water-soluble bags, palletized and shrink-wrapped. Not regulated for transport under ADR/RID/IMDG/IATA. Transport as general cargo; protect from moisture. Store dry, away from sunlight and ignition sources. Handle with standard dust PPE. |
| Storage | Store Adfil Sinta 48/18 (Syntec 48/18) monofilament polypropylene microfiber in original, sealed packaging in a cool, dry, well-ventilated warehouse. Place pallets off the floor, away from direct sunlight, moisture, heat, open flames, and ignition sources. Protect from UV, oils, and chemicals; avoid crushing. Keep bags closed until use. Maintain ambient temperature and follow first-in, first-out stock rotation. |
| Shelf Life | Shelf life: approximately 24 months from manufacture in original unopened packaging, stored dry, away from sunlight, moisture, and moderate temperatures. |
In ready-mixed concrete batching for large-area internal slabs and external hardstands, Adfil Sinta 48/18, a monofilament polypropylene microfibre with a nominal length of 48 mm and filament diameter of 18 µm, is dispensed into the aggregate weigh hopper before the initial water charge. Under EN 206:2013+A2:2021 conformity and the fibre specification EN 14889-2:2006 Class Ia, the product meets the requirements for concrete reinforcing fibres for structural and non-structural use; in North American specification formats it is categorised as ASTM C1116/C1116M-10a Type III synthetic fibre. The batch addition rate for slab applications falls between 0.9 kg/m³ and 1.8 kg/m³, with 1.2 kg/m³ used as the default in slab depths up to 250 mm. The upper band is selected where environmental conditions produce evaporation above 1.0 kg/m²/h or where air movement across the placement exceeds 4.5 m/s, conditions identified in ACI 305R-20 as drivers of plastic shrinkage cracking. In a 3.0 m³ twin-shaft compulsory mixer, mixing time after addition of the last constituent is extended by 15–30 s compared with the non-fibrous programme, and automatic fibre dosing is calibrated to ±0.1 kg/m³. Fibre balling is observed when the filaments are added after free water has wetted the coarse aggregate or when the aggregate moisture exceeds 5%; the corrective action is to move the addition point backward in the dry-mix sequence and to delay water discharge until the fibre has been sheared into the aggregate stream. The mixed concrete is transferred through a 100 mm or 125 mm pump line without significant fibre segregation; slump reduction at 1.2 kg/m³ is typically 20–40 mm when measured by EN 12350-2:2019, so high-range water-reducing admixture dosage is adjusted instead of adding free water. Power trowel finishing proceeds only after bleed water has evaporated, because a steel-trowelled surface sealed before bleed water exits can delaminate under early forklift loads. The terminal products in this segment include warehouse racking slabs, distribution centre floors, saw-cut internal paving, loading dock aprons, and external container hardstands.
Because low water-to-binder ratio precast mixes have limited bleed water to act as a release lubricant at form faces, edge damage during stripping becomes acute in thin-walled elements. Precast producers add Adfil Sinta 48/18 at 0.6–1.2 kg/m³, with 0.9 kg/m³ typical for wall panels and 1.2 kg/m³ reserved for elements with deeply recessed profiles, under EN 13369:2018 common rules for precast concrete products and the fibre specification EN 14889-2:2006. Wet-cast production uses a water-to-binder ratio of 0.36–0.40 with polycarboxylate superplasticizer in a high-shear pan mixer; adding the fibre to the dry aggregate before cement paste improves dispersion and avoids the surface clumping that occurs in zero-slump mixes. Compaction is achieved with external high-frequency vibrators operated at 50–120 Hz for 30–60 s depending on element thickness. Steam curing at 60°C for 12–18 h does not thermally degrade the monofilament because the melting onset of polypropylene begins near 160°C. The demoulding operation is the critical test: strike-through ribs and pour-line fins are removed by a pull-through scraper within 8–16 h after casting, and the fibre-modified green concrete shows fewer chipped edges under the same stripping rate. The terminal products include box culvert segments, manhole rings, concrete pipe collars, cable troughs, and small precast retaining units. Dry-cast zero-slump production is generally unsuitable for this fibre geometry because the 48 mm length can bridge narrow hopper outlets and produce visible fibre mats on the tamped surface; published production-scale data for dry-cast usage are limited.
Wet-mix tunnel linings and permanent slope support programmes incorporate Adfil Sinta 48/18 at 1.0–2.0 kg/m³ in sprayed concrete placed under EN 14487-1:2005 and ACI 506R-16 guidance, using a positive-displacement pump with a 65 mm or 75 mm delivery line. The fibre is charged with the aggregate at the batching plant to avoid nozzle-side addition, which produces concentrated pockets and uneven early-age crack control. The main processing bottleneck appears when hose lengths exceed 60 m; nozzle-side accelerators dosed at 4–8% by cement weight raise the viscosity at the wall of the hose, and the additional internal friction can produce local fibre alignment or balling. Published rebound values for polypropylene microfibre in wet-mix sprayed concrete vary with nozzle distance and air volume; preconstruction spray trials are therefore specified at nozzle distances of 0.8–1.5 m and air volumes of 6–9 m³/min to generate project-specific values. The terminal products include temporary support in NATM headings, rock slope retention, permanent secondary linings, and thick repair layers where the fibre can reduce early-age surface cracking driven by forced ventilation. The material is not a substitute for steel-fibre or welded-wire reinforcement in structural sprayed concrete where toughness or post-crack residual strength is required.
For pumpable self-levelling floor screeds placed over underfloor heating systems and on acoustic separation layers, Adfil Sinta 48/18 is added at 0.6–1.0 kg/m³ to reduce plastic settlement cracking before the binder matrix develops sufficient tensile strain capacity. The mixed mortar is pumped through 25 mm or 32 mm internal diameter hoses over horizontal runs of 30–50 m using a rotor-stator pump; the fibre-related pressure rise is noticeable above 1.0 kg/m³, and pump overload is observed when low-viscosity mixes are pumped through 50 m of narrow hose. Flow table spread is maintained at 220–260 mm by EN 1015-3:1999; the upper dosage of 1.2 kg/m³ reduces spread by more than 30 mm and can cause fibre accumulations behind the serrated spreader or spike roller. Screed material conformity is assessed under EN 13813:2002, and fibre compliance uses EN 14889-2:2006. The terminal products include floating screeds on thermal insulation, unbonded renovation layers over concrete, and bonded levelling courses in residential and commercial floor build-ups. Limitation: the fibre does not eliminate the need for movement joints and does not change the screed's load-bearing class.
On bridge pier and car-park deck repair contracts, polymer-modified, shrinkage-compensated repair mortars formulated with Adfil Sinta 48/18 at 0.5–0.9 kg/m³ are installed to re-profile spalled edges and restore cover to reinforcement. The material is assessed under EN 1504-3:2005 as a structural repair product, with the adhesion requirement verified by EN 1542:1999 at >2.0 MPa for R4-class systems. Substrate preparation by abrasive blasting removes carbonated paste and contaminated laitance; a priming slurry is applied to the saturated-surface-dry concrete before the repair mortar is mixed with a high-shear paddle mixer for 3–5 min. The mortar is wet-applied by trowel, form-and-pour, or low-velocity air spray in lifts of 10–40 mm. The addition of the fibre modifies the fresh mix rheology, reducing slump retention by approximately 10–20% in styrene-butadiene dispersions; the corrective action is to adjust superplasticizer dosage rather than add water, because additional water reduces both adhesion and compressive strength. The terminal products include vertical pier repairs, soffit patches, bridge edge beam reprofiling, and deck overlay patches exposed to cyclic vehicle loading.
During the dryout of dense low-cement alumina-silicate castables, the thermal removal of polypropylene monofilament at 0.1–0.3 wt% of the dry castable mass creates capillary channels that vent water vapour and reduce the internal pressure that causes explosive spalling. The fibre is added in high-shear Eirich-type mixers before water addition, and the castable is installed under vibration to achieve the specified bulk density. The first thermal event in the burnout sequence occurs between 160°C and 170°C, where the monofilament softens and melts; oxidative decomposition of the remaining polymer proceeds between 350°C and 480°C, leaving elongated channels that are most effective when the dryout ramp between 100°C and 600°C is controlled at a rate not exceeding the refractory manufacturer's maximum. The castable classification follows ASTM C401-12, and installation requirements are given in ISO 1927-2:2012. Published product-specific data for Adfil Sinta 48/18 in low-cement castables are limited; the dosage band is derived from generic polypropylene burnout fibre practice in dense refractories rather than from product certification. Terminal products include kiln roof sections, ladle lining precast blocks, burner quarls, and other heat-processing equipment requiring controlled dryout permeability.
Below the critical vapour-pressure plateau in dense C60/75 tunnel concrete, monofilament polypropylene fibre is incorporated at 1.5–3.0 kg/m³ to reduce explosive spalling under the RWS or HCM hydrocarbon fire curves. The fibres melt between 160–170°C, creating a transient network of water-permeable channels before the water vapour pressure reaches the tensile strength of the heated matrix. Tunnel segment production uses a high-frequency external vibration table and a low water-to-binder ratio below 0.35, with polycarboxylate superplasticizer; the fibre is added to the dry aggregate phase to prevent agglomeration in the high-paste SCC. Fire resistance testing follows EN 1363-1:2020, with project-specific spalling assessments performed on full-depth specimens because no single fibre dosage universally guarantees anti-spalling behaviour across all aggregate types and moisture conditions. The terminal products include TBM segment rings, immersed tube elements, cross-passage linings, and emergency egress structures where hydrocarbon fire exposure is specified in the design basis.
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Adfil Sinta 48/18 (Syntec 48/18) is a monofilament polypropylene microfiber supplied for secondary reinforcement of concrete, mortar, shotcrete, and screed mixes. The material is produced from virgin polypropylene homopolymer with a nominal filament diameter of 48 µm and a nominal cut length of 18 mm, giving an average aspect ratio of 375:1. Under ASTM C1116/C1116M the product falls within Type III synthetic fiber reinforcement; under EN 14889-2:2006 it is classified as a polymer fibre for concrete, mortar, and grout with a Class Ib function limited to plastic shrinkage crack control. The specific gravity is 0.91 g/cm³, and the calculated filament count is approximately 1.25 × 10⁸ fibers per kilogram. The cross-section is a solid circular monofilament rather than a fibrillated tape or network, which affects dispersion, finishing behavior, and the risk of fiber balling in production concrete.
In ready-mix batching, the product is added at 0.6 kg/m³ to 1.2 kg/m³, with 0.9 kg/m³ commonly specified for slabs on grade, pavements, and decorative flatwork. Plant records show that addition to the aggregate weigh hopper before charging minimizes fiber clustering, while addition after water can produce transient balling in low-temperature mixes. In twin-shaft compulsory mixers, distribution is typically achieved within 90 s of wet mixing at 18 rpm; drum mixers generally require 120 s to 180 s at normal mixing speeds. Because polypropylene is hydrophobic, water absorption determined to ISO 62:2008 is reported as ≤ 0.1 %, and no pre-drying is required at relative humidity up to 95 %. Slump reduction at 0.9 kg/m³ is typically 10 mm to 20 mm, and no additional water is normally needed to restore target slump.
The primary function of Sinta 48/18 is reduction of plastic shrinkage cracking during the first 6 h after placement, when surface evaporation exceeds bleed-water replacement. In ASTM C1579-21 testing at an evaporation rate of 1.0 kg/m²/h, concrete containing 0.9 kg/m³ of the monofilament fibre has shown crack width reductions of 60 % to 80 % relative to the same mix without fibre. The mechanism is physical bridging of microcracks and redistribution of local tensile stress, not chemical interaction with cement hydration. With a fibre modulus of approximately 3.5 GPa, the monofilament does not prevent crack initiation under high restraint; it limits crack coalescence and visible crack width after microcrack formation.
Restrained ring tests performed under ASTM C1581/C1581M-18 in mortars with water-to-cement ratios from 0.40 to 0.50 indicate that time-to-cracking can be extended by 40 % to 90 %, but the exact extension is mix-specific and published data for this particular formulation is limited. The fibre does not eliminate drying shrinkage after final set. In power-trowelled floor construction, a dosage of 0.6 kg/m³ is frequently selected to reduce surface fuzzing while retaining plastic crack control. The product remains effective in low-slump concrete and roller-compacted applications where fibre dispersion is assisted by aggregate interparticle shear.
Finishability is affected by the high filament count and limited bleed-water continuity. At 0.9 kg/m³, the fibre surface area can reach 25 m²/kg to 30 m²/kg, which retards bleed channel formation and may advance the disappearance of surface water sheen by 15 min to 30 min under high wind or low relative humidity. Field reports from power-trowelled slabs indicate that trowelling should begin only when the water sheen disappears and that float blades set 1 mm to 2 mm above the surface reduce filament exposure. Burnishing is limited to two passes; additional passes can expose surface filaments and produce a cosmetic hair-like texture that is not structural in nature.
Fibrillated polypropylene fibres are extruded as film and slit into interconnected networks; Sinta 48/18 is produced as individual circular monofilaments. This difference in geometry reduces the probability of fibre balling during dry mixing and improves distribution in low-slump concrete. The 48 µm diameter is larger than many fibrillated fibers, which typically range from 20 µm to 40 µm; the result is a lower filament count per kilogram but improved handling and reduced surface fuzzing. Steel macrofibres at 20 kg/m³ to 40 kg/m³ provide post-crack flexural capacity and are specified where structural load transfer after cracking is required. Sinta 48/18 at 0.9 kg/m³ does not perform that function. The elastic modulus of steel is approximately 210 GPa, compared with approximately 3.5 GPa for polypropylene, meaning the synthetic microfibre cannot bridge hardened-concrete macro-cracks at equivalent stress levels.
| Property | Adfil Sinta 48/18 | Fibrillated PP microfibre | Steel macrofibre |
|---|---|---|---|
| Material | Virgin polypropylene monofilament | Fibrillated polypropylene film | Cold-drawn steel wire |
| Nominal diameter | 48 µm | 20 µm–40 µm | 500 µm–900 µm |
| Nominal length | 18 mm | 12 mm–19 mm | 35 mm–60 mm |
| Specific gravity | 0.91 g/cm³ | 0.91 g/cm³ | 7.85 g/cm³ |
| Tensile strength | 300 MPa–400 MPa | 300 MPa–500 MPa | 1 000 MPa–1 500 MPa |
| Elastic modulus | 3.5 GPa | 3.0 GPa–4.0 GPa | 200 GPa–210 GPa |
| Typical dosage in slabs | 0.6 kg/m³–1.2 kg/m³ | 0.6 kg/m³–1.2 kg/m³ | 20 kg/m³–40 kg/m³ |
| Primary function | Plastic shrinkage crack control | Plastic shrinkage crack control | Post-crack load capacity |
Precast producers use Sinta 48/18 in non-structural panels, architectural cladding, utility boxes, and other cementitious elements where early-age crack control reduces repair rates. In dry-cast extrusion processes, the fibre is introduced at 0.6 kg/m³ to 0.9 kg/m³, and the low water-to-cement ratio does not prevent distribution because the monofilament geometry is less prone to entanglement than fibrillated film. Isothermal calorimetry comparisons show no significant retardation beyond 15 min at 0.9 kg/m³. In wet-cast façade elements, the fibre reduces plastic settlement cracking above reinforcing bars and at abrupt section changes where cover depth is limited.
For dry-mix shotcrete, the product is introduced into the pre-damped aggregate phase before pneumatic delivery. Addition rates of 0.9 kg/m³ to 1.2 kg/m³ improve cohesion and reduce rebound in thin repair linings, but the material does not provide the impact toughness of steel fibre shotcrete at 30 kg/m³. Wet-mix shotcrete operations using 50 mm delivery lines have reported no blockage at 1.0 kg/m³ when the nozzle air supply remains above 4 m³/min.
In chloride-bearing environments, the fibre does not corrode and its crack-control function can delay the onset of direct chloride ingress. Concrete with 0.9 kg/m³ of Sinta 48/18 and a 0.40 water-to-cement ratio has been evaluated using NT Build 492; the non-steady-state chloride migration coefficient is not directly changed by the fibre, but cracked specimens may exhibit lower apparent chloride diffusion than cracked plain concrete because the crack widths are finer. This is an indirect durability benefit and must not be used to reduce specified concrete cover or to alter structural design assumptions.
Freeze-thaw resistance evaluated under ASTM C666/C666M-15 Procedure A is not degraded by fibre addition. Air-void spacing factors measured to ASTM C457/C457M-16 remain within specification when the fibre is used with an air-entraining admixture, provided mixing time is sufficient. The fibre does not entrain air; it may increase plastic viscosity and reduce the efficiency of some high-range water reducers by 5 % to 10 %, requiring an admixture dosage adjustment verified by slump-flow measurement.
Because the fibre is hydrophobic, it does not participate in cement hydration. Set time measured by ASTM C403/C403M-16 is typically within 15 min of the control mix at 0.9 kg/m³. This behavior distinguishes the product from cellulose or natural fibers that may absorb mix water and delay initial set or increase water demand.
Air-entrained concretes containing Sinta 48/18 should be evaluated for spacing factor stability. In laboratory trials, adding 0.9 kg/m³ to a mix with 6 % total air produced a spacing factor shift of less than 0.02 mm when the fibre was added after the air-entraining admixture was fully dispersed. When the fibre was charged before the air-entraining agent, air content could vary by 0.5 % to 1.0 %. The sequence of admixture addition is therefore a process control point; plant records recommend charging the fiber with aggregates, then adding water, cement, and air-entraining agent last.
Polypropylene microfibers are specified in high-performance concrete at 1.5 kg/m³ to 2.0 kg/m³ to reduce explosive spalling under hydrocarbon fire exposure because melting fibers create pressure-relief microchannels above 160 °C. Published data for Sinta 48/18 in this specific configuration is limited, but the nominal melting point and the monofilament geometry are consistent with the spalling-reduction mechanism reported for polypropylene microfibres. The product should not be used in continuous service above 90 °C, and steam curing above 80 °C is not recommended because filament softening may reduce bridging efficiency.
| Attribute | Test method | Acceptance range |
|---|---|---|
| Material | EN 14889-2:2006 Clause 4.1 | Virgin polypropylene monofilament |
| Nominal diameter | Optical microscopy / manufacturer certificate | 45 µm–52 µm |
| Nominal length | Calliper measurement | 17 mm–19 mm |
| Density | ISO 1183-1:2019 | 0.90 g/cm³–0.92 g/cm³ |
| Tensile strength | ISO 5079:2020 | ≥ 300 MPa |
| Modulus of elasticity | ISO 5079:2020 | 3.0 GPa–4.0 GPa |
| Water absorption | ISO 62:2008 | ≤ 0.1 % |
| Alkali resistance | EN 14889-2:2006 Annex C | No visible degradation at 28 d in 1 M NaOH |
| Effect on concrete | EN 14889-2:2006 Annex B | Plastic shrinkage crack reduction ≥ 40 % |
Operational boundaries apply. Sinta 48/18 is not a substitute for primary steel reinforcement in suspended slabs, beams, or other structural members. At 0.9 kg/m³, flexural strength measured to ASTM C78/C78M-21 is not increased to a structurally significant degree; the function is limited to control of early-age cracking and surface integrity. The product should not be exposed to sustained service temperatures above 90 °C, and steam curing above 80 °C is not recommended. The fibre is compatible with conventional air-entraining agents, superplasticizers, and set retarders, but trial batching is recommended when new admixture combinations or extended mixing times are introduced. Structural post-crack toughness applications require macro-synthetic or steel fibre systems designed to ASTM C1609/C1609M-19a or EN 14889-1.
