| HS Code | 617559 |
| Density | 0.918 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 2.0 g/10 min |
| Melting Point | 122 °C |
| Vicat Softening Point | 100 °C |
| Tensile Strength At Yield | 12 MPa |
| Tensile Strength At Break | 38 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 260 MPa |
| Dart Drop Impact F50 | >600 g |
| Environmental Stress Crack Resistance F50 | >50 h |
| Brittleness Temperature | -75 °C |
| Haze | 12% |
As an accredited Singapore LLDPE FS253S factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packed in 25 kg woven polypropylene bags with PE liner, palletized and shrink-wrapped, 1,000 kg per pallet. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Singapore LLDPE FS253S: palletized bags, evenly distributed, moisture-protected, and securely braced for safe transit. |
| Shipping | LLDPE FS253S, a Singapore-origin linear low-density polyethylene resin, ships as non-hazardous solid pellets. Pack in 25-kg bags, palletized and stretch-wrapped, inside clean, dry containers. Protect from moisture, direct sunlight, and temperatures above 50°C. No special transport required, but maintain good ventilation and avoid contamination. |
| Storage | Store Singapore LLDPE FS253S in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep original containers tightly sealed to prevent moisture contamination, dust, and foreign matter. Avoid prolonged outdoor exposure and stacking excessively high. This material is non-hazardous, but maintain good housekeeping practices. Use FIFO to ensure optimal storage stability. |
| Shelf Life | Shelf life of Singapore LLDPE FS253S is typically 12 months when stored in original packaging under dry, cool conditions. |
Frozen food packaging film converting on three-layer blown-film lines requires a sealant layer that remains ductile at -25°C while maintaining hot-tack performance on vertical form-fill-seal machines. A starting formulation for the sealant web is 65 wt% Singapore LLDPE FS253S, 25 wt% LDPE, and 10 wt% slip/antiblock masterbatch. The FS253S phase raises dart impact and low-temperature puncture resistance relative to straight LDPE, while the LDPE phase stabilizes bubble geometry at 2.0–2.5 blow-up ratio. Direct food contact compliance is assessed under FDA 21 CFR 177.1520(c)(3.1a) for olefin polymers and EU Regulation (EU) No 10/2011, with overall migration below 10 mg/dm² in food simulants. Extrusion is performed on a 70 mm barrier screw with 30:1 L/D, die gap 1.8–2.4 mm, melt adapter temperature 190–220°C, and frost-line height 6–8 times the die diameter. At line speeds above 80 m/min, bubble instability appears if the LDPE fraction drops below 15 wt% or if air-ring velocity exceeds 25 m/s. Because FS253S is not hygroscopic, pre-drying is generally unnecessary; moisture-related bubble defects usually originate from additive masterbatch or recycled content rather than the base resin. Terminal products include gusseted freezer bags, pillow pouches for IQF vegetables, seafood block liners, and poultry bags, sealed at 110–135°C jaw temperature and tested for seal strength by ASTM F88/F88M-15 and dart impact by ASTM D1709-15a.
High-speed cast extrusion of pallet wrap containing LLDPE FS253S exposes two competing constraints: draw resonance at the die lip and pre-stretch puncture at the wrapping station. On a 90 mm extruder with 33:1 L/D and a 2.4 m coat-hanger die, the film typically runs at 450–700 m/min, but LLDPE grades with narrow molecular weight distribution can enter draw resonance above 550 m/min if the air gap exceeds 120 mm or if the chill roll temperature falls below 18°C. A production-scale adjustment is to blend 15–40 wt% metallocene LLDPE or 5–15 wt% high-melt-strength LDPE into the FS253S core layer and to reduce the die gap to 0.5–0.8 mm. The FS253S addition ratio is therefore held at 55–80 wt% in the core, with polyisobutylene tackifier at 0.8–2.0 wt% injected after the gear pump; outer skin layers typically contain 0.3–0.8 wt% erucamide for release and 0.2–0.5 wt% antistat masterbatch. Compliance testing includes ASTM D5458-95 for peel cling and ISO 527-3:2018 for machine-direction elongation. Coefficient of friction is measured by ASTM D1894-14. Terminal products include 15–23 μm hand pallet wrap, machine film for 200–300% pre-stretch, and A-B roll types that require edge profile variance below ±3 μm to avoid telescoping on automatic turntable wrappers. Published data for FS253S in high-line-speed cast configurations is limited; converters should run a short trial at 250 m/min increments to map the resonance boundary before committing to roll-stock production.
Round bale silage wrap made with FS253S is produced as 25 μm film on three-layer blown-film towers, where the critical failure modes are UV-induced embrittlement before 12 months field exposure and oxygen ingress at overlapping film layers. A robust starting formulation is 88–95 wt% FS253S, 3–6 wt% hindered amine light stabilizer masterbatch, 1–2 wt% titanium dioxide or carbon black pigment masterbatch, and 0.02–0.05 wt% fluoropolymer processing aid. Pigment loading must stay within the carrier’s recommended let-down ratio because pigment agglomerates at >2 wt% can elevate gel counts and produce pinholes. The film is blown at 2.8–3.2 blow-up ratio and 140–180 kg/h output on a 75 mm grooved-feed extruder with internal bubble cooling, keeping melt temperature at 185–210°C; higher melt temperatures accelerate thermal deactivation of the HALS package. Oxygen permeability is measured by ASTM D3985-17 or ISO 15105-2:2003 at 23°C and 0% RH. Compliance is assessed under EN 13206:2017 for agricultural films, with weathering durability tested by ISO 4892-2 xenon-arc exposure. Terminal products are 500 mm and 750 mm rolls with 1,500–1,800 m length, used on round balers with 60–70% pre-stretch. The operational boundary is most sensitive at the edge of the roll: film exposed to direct sunlight on machine-stored bales can lose elongation before the centre of the web, so field validation should include tensile retention after 6,000 kJ/m² UV dose rather than relying only on accelerated laboratory weathering.
When FS253S is extrusion-coated onto woven polypropylene sack fabric, adhesion depends less on melt index and more on oxidative polarity generated in the 150–220 mm air gap. The coating line runs a 90 mm single-screw extruder at 290–315°C melt temperature, depositing 12–25 g/m² of molten LLDPE over corona-treated fabric. If the air gap is shortened below 100 mm, peel adhesion drops below acceptable values because insufficient oxidation occurs before the nip, while an air gap above 250 mm causes excessive neck-in and edge waste. A production-validated formulation is 70–90 wt% FS253S with 10–30 wt% LDPE or 5–12 wt% PP-compatible tie resin. The LDPE reduces extruder backpressure and stabilizes the melt curtain, but LDPE above 30 wt% lowers low-temperature dart impact on the finished sack. The laminated fabric is tested by ASTM D1876-08 for peel adhesion and ASTM D1709-15a for dart impact. Sack dimensions and safe working load follow ISO 21898:2004 for non-hazardous flexible intermediate bulk containers or the applicable bale/sack specification. Terminal products include 25–50 kg cement bags, polymer pellet sacks, and mineral feed bags, where the LLDPE coating provides a moisture barrier and reduced stack-slip angle. Published data specifically for FS253S coating on high-denier fabric is limited; converters should run a 200 m trial and measure both immediate and 24-hour peel adhesion because post-crystallization adhesion can change by 10–20%.
Blown tubular liners produced from FS253S are fabricated for steel and fiber drums, with wall thickness selected from 75 μm to 150 μm according to fill mass and the drop height of 1.8 m specified in the UN Model Regulations for dangerous goods packaging. The extrusion process uses a 65 mm extruder with 25:1 L/D, die gap 1.2–1.8 mm, blow-up ratio 1.8–2.2, and melt temperature 180–210°C. The film is slit and welded into cylindrical liners with bottom-seal width 6–10 mm and side-seam width 8–12 mm. A typical formulation is 85–100 wt% FS253S with 0–15 wt% LDPE to adjust flex-crack resistance. Slip agent is often omitted when the liner must remain fixed inside a fiber drum, while antistatic masterbatch at 0.5–1.5 wt% is added for powder filling applications. Liquid chemical compatibility is verified by ASTM D543-20, and the welded liner is leak-tested under 49 CFR 178.604. Terminal products include drum liners for fatty acids, lubricant additives, water-based emulsions, and powder resins. The liner must survive compression at the base crease during filling, which is why the bottom weld is offset 10–15 mm from the fold and why film gauge uniformity is held to ±5 μm. The material is not recommended for strong oxidizing acids or low-boiling aromatic solvents at temperatures above 40°C because LLDPE swells and environmental stress cracking may occur; compatibility testing must precede production use.
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Singapore LLDPE FS253S is a linear low-density polyethylene grade in which butene-1 is the primary alpha-olefin comonomer. The resin is supplied as pellets for blown film extrusion and is specified principally by melt mass-flow rate and density. Published class data for this product indicate a nominal melt index of 2.0–2.5 g/10 min measured under ASTM D1238 at 190°C and 2.16 kg load, and a nominal density of 0.922–0.925 g/cm³ determined by ASTM D1505. These values position FS253S in the conventional butene-copolymer LLDPE processing window, but the exact certificate of analysis must govern because melt index and density are not sufficient to predict film toughness, seal response, or tear balance. The Singapore-origin designation reflects production on Jurong Island facilities, but the grade name alone does not identify the polymerization catalyst or additive package.
FS253S belongs to the butene-copolymer class of linear low-density polyethylene. Butene-1 incorporation creates ethyl short-chain branches that disrupt lamellar crystallization less effectively than the butyl branches generated by hexene-1 or the hexyl branches generated by octene-1. At equivalent density, the butene copolymer generally develops a lower tie-chain concentration between lamellae, which suppresses dart impact resistance and transverse-direction Elmendorf tear. This is not a processing defect; it is a structural consequence of comonomer choice. Differential scanning calorimetry of this material class typically records a primary melting endotherm in the range of 121–126°C, with the exact peak shifting upward when density is raised by lower comonomer feed. Converters should not use melting point alone to identify contamination or lot variation.
The complete molecular architecture of FS253S, including molecular weight distribution and long-chain branching level, is not fully disclosed in public supplier documentation. Production-routed differences—gas-phase fluidised-bed versus solution polymerization—alter branch distribution and oligomer concentration without necessarily changing melt index. Because Singapore LLDPE FS253S can be produced using a non-disclosed catalyst system, direct substitution into established formulations should be validated by film testing on the intended line. Published data for this specific configuration is limited; physical property data generated on the converter’s blown film line are required for specification approval.
FS253S is processed on standard low-pressure LLDPE blown film lines with single-flighted, barrier, or Maddock mixing sections. On a 65 mm extruder with a 24:1 to 30:1 L/D ratio and a die gap of 1.8–2.5 mm, stable bubble operation is typically observed at melt temperatures between 190°C and 230°C. Die temperature should be held within ±5°C of the melt temperature to reduce port-line flow marks and bubble vibration. Blow-up ratios of 2.0:1 to 3.0:1 and frost line heights of 6–10 die diameters are common starting conditions. If the die gap is reduced below 1.6 mm to improve clarity, melt shear stress rises; sustained melt pressure above 350 bar on a 65 mm line may accelerate screw wear and raise melt temperature.
For monolayer heavy-duty sack film, typical screw speed ranges from 45 rpm to 80 rpm depending on target output. At 150 kg/h on a 65 mm line, melt pressure between 280 bar and 330 bar is generally considered stable. Oscillations above 20 bar over a 10-second window often indicate feed bridging or pellet geometry variation, not melt fracture. Reducing hopper throat temperature below 45°C and maintaining a consistent pellet feed level minimizes this disturbance. Independent arm air rings and internal bubble cooling improve frost line control, but FS253S does not require internal bubble cooling for gauge stability at moderate line speeds.
Feed stability on Singapore lines becomes more sensitive when pellets are transferred from air-conditioned silos to warmer, humid extrusion halls. Surface condensation can form even though LLDPE has negligible bulk moisture absorption. If visible surface moisture is present, a desiccant dryer set to 60–70°C for 1–2 hours restores feeding consistency without altering stabilizer performance. Hot-air drying above 80°C should be avoided for extended periods because pellet surface tack can appear. Feed throat sensors should be shielded from false material-level readings caused by static accumulation in dry conveying lines.
For heavy-duty sack film, FS253S is evaluated primarily by tensile strength under ASTM D882, elongation at break, and dart impact under ASTM D1709A. The puncture resistance of butene LLDPE tends to be lower than hexene LLDPE at the same gauge, but sack construction can compensate by using thicker film or by blending with recycled LDPE. In lamination, the resin’s seal strength under ASTM F88 and coefficient of friction under ASTM D1894 are more relevant than tensile yield. Since FS253S is a butene copolymer, slip addition may be required if the film is used in high-speed converting lines. The specific slip and antiblock formulation supplied under the FS253S designation should be verified because additive concentration affects seal strength and haze; over-addition of erucamide can raise seal initiation temperature and reduce hot tack.
Agricultural film applications in tropical conditions expose FS253S to ultraviolet radiation and contact with agrochemicals. A stabilizer masterbatch containing hindered amine light stabilizers should be added at the manufacturer’s recommended letdown. Sulfur-containing agrochemicals may consume some phenolic antioxidants; accelerated weathering according to ASTM D4329 or ASTM G154 is recommended before field use. Published field data for FS253S specifically under Singapore tropical conditions is limited, but the stabilizer package determines outdoor service life more than the base resin’s melt index or density.
| Film property | Test method | Qualification purpose |
|---|---|---|
| Dart impact | ASTM D1709A | Puncture toughness at specified gauge |
| Elmendorf tear, MD/TD | ASTM D1922 | Tear propagation resistance and anisotropy |
| Tensile strength and elongation | ASTM D882 | Yield, break strength, and deformation capacity |
| Haze | ASTM D1003 | Optical clarity for printed or laminated film |
| Gloss at 45° | ASTM D2457 | Surface appearance |
| Coefficient of friction | ASTM D1894 | Slip performance in high-speed converting |
| Seal strength | ASTM F88 | Heat-seal performance |
| Hot tack | ASTM F1921 | Seal strength during solidification on vertical form-fill-seal lines |
Thin-gauge downgauging of FS253S below 20 µm changes the mechanical failure hierarchy. Puncture and tear propagation replace tensile yield as the limiting properties. The deformation volume under the dart tip scales with film thickness, so ASTM D1709A dart impact can fall sharply between 25 µm and 15 µm even when the polymer density and melt index remain constant. On a blown or cast line, machine-direction tear measured by ASTM D1922 may remain acceptable while transverse-direction tear decreases disproportionately. This tear anisotropy is more pronounced in butene copolymers than in hexene- or octene-based grades. Lot acceptance should include tear balance in both directions rather than relying only on machine-direction Elmendorf tear.
For converter operations in thinner film, the frost line height and blow-up ratio should be adjusted to reduce transverse orientation gradients. Reducing blow-up ratio from 3.0:1 to 2.2:1 can lower transverse orientation and improve transverse-direction tear, but haze may increase. Blending FS253S with 10–30 wt% hexene-1 LLDPE is a common approach to recover transverse tear and dart impact; blend efficiency depends on the melt index ratio and should be evaluated with ASTM D1709A and ASTM D1922 on the final blown film. Supplier guidance for this specific blend configuration is limited, so converter-run design-of-experiments is required.
FS253S is considered in polyethylene-rich structures where ethylene-vinyl acetate copolymers are being reduced for cost control or recyclability. The grade gives a lower seal initiation temperature than LDPE homopolymer, but its sealing envelope is narrower than EVA or metallocene VLDPE. In ASTM F88 seal tests, measurable seal strength is generally observed above 110–120°C, with plateau seal strength reached only after dwell time increases above 0.5 second. Hot tack measured by ASTM F1921 should define the minimum seal bar temperature on vertical form-fill-seal machines, especially for film below 25 µm. Published data for FS253S on high-speed form-fill-seal equipment is limited; converter line trials must establish the seal window because hot tack is sensitive to jaw geometry, dwell time, and film gauge.
In flexible packaging, FS253S is not a direct replacement for high-EVA sealant films. If an 85–90°C hot-tack plateau is required, metallocene VLDPE or EVA-rich layers remain necessary. FS253S is better matched to secondary packaging, agricultural film, and heavy-duty sacks where seal initiation is secondary to puncture and tear economics.
FS253S differs from low-density polyethylene in its linear backbone and lower long-chain branching. This provides higher dart impact and tensile strength at equivalent gauge, but lower melt strength and less bubble stability than tubular LDPE. When compared with hexene-1 LLDPE of the same nominal melt index and density, FS253S generally shows lower dart impact, lower transverse-direction Elmendorf tear, and slightly higher haze; however, it may offer a more favorable cost position and sufficient performance for many medium-duty applications. Against metallocene LLDPE, FS253S usually exhibits a broader molecular weight distribution, higher extrusion motor load at equivalent melt index, lower optical clarity, and inferior low-temperature impact. The product is therefore placed as a cost-efficient butene film resin rather than as a competitor to ultra-tough metallocene grades. Comparative properties should be confirmed by side-by-side blown film trials because comonomer type and additive package affect this ranking.
Food-contact use of FS253S must be supported by a supplier statement referencing FDA 21 CFR 177.1520 and European Union Regulation (EU) 10/2011. The base polyethylene copolymer may satisfy the compositional requirements, but the final packaging structure must pass overall migration testing under EN 1186-1:2002 and any specific migration limits applicable to antioxidants, slip agents, and antiblock additives. REACH registration of monomer and additive substances is expected; the safety data sheet should be retained for lot traceability. RoHS 2011/65/EU maximum concentration values for lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers apply to pigments and masterbatches rather than to uncolored base resin.
| Standard or regulation | Scope | Converter responsibility |
|---|---|---|
| FDA 21 CFR 177.1520 | Olefin polymers in food contact | Confirm supplier statement; verify extractives limits for the intended food type and temperature |
| EU Regulation 10/2011 | Plastic food-contact materials | Overall migration ≤ 10 mg/dm²; specific migration limits for additives |
| EN 1186-1:2002 | Overall migration testing | Select simulants according to food category and contact time |
| REACH | Chemical registration and SVHC | SVHC content below 0.1% w/w per article |
| RoHS 2011/65/EU | Hazardous substances in EEE | Pb, Cd, Hg, Cr(VI), PBB, PBDE below maximum concentration values |
| ASTM D1238 | Melt mass-flow rate | Lot release at 190°C/2.16 kg |
| ISO 1133-1:2022 | Melt mass-flow rate alternative | Method A or B with specified temperature and load |
Storage of FS253S should be in sealed bags at temperatures below 50°C and away from direct ultraviolet exposure. Opened bags should be consumed within the same campaign to minimize dust pickup and additive migration. Exposure to strong oxidizing agents, unsaturated hydrocarbons, or prolonged high-shear thermal history above 240°C may alter stabilizer performance and film color. The resin is not intended for medical implant applications or for use with high-purity oxidative chemical contact.
