| HS Code | 830460 |
| Material | Low Density Polyethylene |
| Color | Translucent |
| Thickness | 4 mil |
| Width | 60 in |
| Length | 500 ft |
| Density | 0.92 g/cm3 |
| Tensile Strength | 2500 psi |
| Elongation At Break | 500% |
| Maximum Use Temperature | 180 F |
| Melting Point | 230 F |
| Heat Seal Temperature | 250 F |
| Water Absorption | <0.01% |
As an accredited Air Tech LDPE 60 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Air Tech LDPE 60 supplied in 25 kg polyethylene-lined paper sacks, palletized and shrink-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | Air Tech LDPE 60 chemical is loaded into a 20-foot FCL container, palletized, secured, and stowed for safe ocean transport. |
| Shipping | Air Tech LDPE 60 is typically shipped as a non-hazardous, non-regulated solid polymer in sealed bags, drums, or bulk containers. Store in a cool, dry area away from ignition sources. For transport, use standard freight; no special hazard placards are required. Refer to supplier SDS for exact packaging and handling. |
| Storage | Store Air Tech LDPE 60 in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and flames. Keep containers tightly closed, labeled, and upright. Protect from moisture, dust, and contamination. Separate from oxidizers and incompatible materials. Avoid dust generation; use grounding if required. Store only in approved containers and follow the supplier’s safety data sheet. |
| Shelf Life | Air Tech LDPE 60 typically has a 3-year shelf life from manufacture when stored in original packaging under recommended conditions. |
Dispersion trials in a co-rotating twin-screw extruder with 40:1 L/D ratio show that Air Tech LDPE 60 functions primarily as a carrier resin for colour and additive masterbatch when the base polymer is a polyolefin with a melt flow rate below 10 g/10 min. The grade’s nominal melt flow rate of 60 g/10 min at 190 °C/2.16 kg according to ISO 1133-1:2022 delivers a low-viscosity melt that wets pigment surfaces and reduces agglomerate persistence after high-shear dispersion. Masterbatch formulations typically contain 20–40 wt% LDPE 60, 30–60 wt% organic or inorganic pigment, 0.5–5 wt% dispersant, and 0.1–0.5 wt% antioxidant. Barrel profile is staged from 120–140 °C in the feed zone to 190–220 °C at the die, and vacuum venting at −0.08 MPa removes low-molecular-weight volatiles. On production-scale twin-screw lines, the first barrel zone must be kept below 140 °C to prevent pellet surface smearing and subsequent feed throat bridging. If melt temperature exceeds 250 °C, surface blemishes appear in injection-moulded test plaques, and odour generation is detectable. The concentrate is let down at 2–5 wt% into polyolefin film, blow moulding, or injection moulding base resin; the final article then contains below 1 wt% LDPE 60. Regulatory positioning for food-contact packaging requires the LDPE carrier to comply with FDA 21 CFR 177.1520(c) and, in the EU, Regulation (EU) No 10/2011; pigments and additives must independently meet 21 CFR 178.3297 or national positive lists. Because the carrier is a low-density, highly branched polyolefin, high let-down ratios in semicrystalline rigid resins can reduce notched Izod impact measured under ASTM D256-23 and tensile yield measured under ASTM D638-14; published data for this specific carrier/base combination is limited, so laboratory let-down trials should be used to set the upper addition limit for a given final part.
The substitution limits for Air Tech LDPE 60 in ethylene-vinyl acetate hot melts are set primarily by phase compatibility and low-temperature peel behaviour rather than by melt viscosity alone. EVA-based hot melts for case and carton sealing typically contain 18–33 wt% vinyl acetate copolymer, tackifying resin, and paraffin or microcrystalline wax. Air Tech LDPE 60 can be added at 5–15 wt% of the total formulation as a polymeric diluent that shortens open time and raises set speed. Mixing is carried out in a sigma-blade or vertical heated mixer at 150–180 °C until a clear, homogeneous melt is obtained; application through a gear pump and slot die is normally set at 170–190 °C. Melt viscosity is measured at 180 °C with ASTM D3236, and heat-fail temperature in shear is determined with ASTM D4498-07. Compatibility with EVA depends heavily on vinyl acetate content; formulations with low VA content or high wax content may show phase separation at LDPE addition levels above 15 wt%, visible as surface haze and a measurable drop in 180° peel adhesion on corrugated board tested under ASTM D903. Thermal stabilizer packages in the range of 0.1–0.3 wt% phosphite antioxidant are normally required because viscosity drift of more than 10% after 24 h at 180 °C indicates degradation. For food packaging adhesives, the finished hot melt is controlled under FDA 21 CFR 175.105 in the United States and must comply with the applicable EU framework regulation on food-contact materials. The terminal products include corrugated box sealing, bookbinding, paperboard tray erection, and multi-wall bag closure.
Injection moulding of thin-wall closures from Air Tech LDPE 60 exploits the grade’s 60 g/10 min melt flow rate to fill wall sections of 0.4–0.8 mm without excessive cavity pressure. The processing window is set at 180–230 °C melt temperature, 15–40 °C mould temperature, and high injection speed; hot runner manifolds are normally held at 190–220 °C. The low melt viscosity reduces short shots but increases molecular orientation, so gate seal time must be confirmed by cavity pressure measurement to prevent underpacking and sink marks opposite the gate. A typical blend is 5–20 wt% LDPE 60 added to a lower-flow LLDPE to maintain closure flexibility while improving fill; the resulting compound is used for caps, overcaps, dispensing cups, and thin-wall lids. Shrinkage is measured on the actual mould geometry under ASTM D955-08(2023) because high-flow grades exhibit parallel-to-flow and normal-to-flow shrinkage differences. Tensile yield and elongation at break are evaluated under ASTM D638-14 on plaques moulded according to ISO 294-1:2017. For food-contact closures, the grade is positioned under FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011; specific migration testing is required on the finished article because additive packages and processing conditions affect overall migration results obtained under EN 1186 methods. Moulds with long flow paths require pad printing or laser marking after demoulding because the high-flow surface freezes quickly and can develop orientation-induced haze.
Paraffin wax crystallisation in container and pillar candle formulations is altered when 2–8 wt% Air Tech LDPE 60 is dissolved into the wax at 85–100 °C under low-shear agitation. The polymer chains act as nucleation sites and reduce the size of wax crystals, which controls mottling and improves oil binding in the solid state. Complete dissolution is confirmed by passing the melt through a 100 mesh screen; undispersed gel particles can obstruct the wick and cause uneven burning. The finished candle is assessed for fire safety and sooting behaviour under EN 15493:2019 and EN 15426:2018. Wax/polymer blends are typically poured at 75–85 °C into containers or moulds, and forced air cooling is avoided because rapid quenching locks in surface ripples. At addition levels above 8 wt%, melt viscosity rises and the solidified wax becomes brittle, which can cause cracking during wick insertion or transport. The grade does not replace liquid paraffin or petrolatum; it functions as a crystal modifier and stiffness agent. Because candle wax blends are not food-contact applications, the primary regulatory obligations are REACH and any national restrictions on combustion emissions; no direct FDA clearance is required unless the candle is marketed with cosmetic-contact claims.
Recycled polypropylene and high-density polyethylene batches with melt flow rates below 2 g/10 min can be corrected by compounding 3–12 wt% Air Tech LDPE 60 on a single-screw extruder with 30:1 L/D and melt filtration through a 100–120 mesh screen pack. The barrel profile is set at 180–220 °C, and vacuum venting at −0.08 MPa is applied if the regrind moisture level exceeds 0.1 wt%. The high-flow LDPE raises the compound melt flow rate measured under ASTM D1238-20 or ISO 1133-1:2022, allowing lower-velocity mould fill and reduced knit lines in industrial bins, crates, pallets, and non-food drainage fittings. Because LDPE is immiscible with polypropylene, addition above 10 wt% in PP-rich streams introduces separate melting endotherms near 105–115 °C for LDPE and 160–166 °C for PP homopolymer in differential scanning calorimetry, and notched Izod impact measured under ASTM D256-23 can decline. For recycled-content traceability, the compounder should maintain lot-level records under EN 15343:2007, including incoming waste source, melt flow rate, and final compound composition. Migration and food-contact compliance are not assigned because post-consumer recycled feedstocks generally fail FDA 21 CFR 177.1520 and Regulation (EU) No 10/2011 positive-list requirements unless the recycle stream is approved as a closed-loop or functional barrier under the relevant authority. RoHS Directive 2011/65/EU applies only when the moulded part is incorporated into electrical and electronic equipment; flame retardants and heavy metals must then be controlled separately.
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Air Tech LDPE 60 is identified in supplier documentation as a low-density polyethylene homopolymer of the PE-LD family described in ISO 1872-1. The suffix in the grade name is not an ISO designation code and cannot be converted directly into a melt mass-flow rate. Because published data for this specific configuration is limited, incoming material should be qualified against a batch certificate covering at least melt mass-flow rate, density, tensile properties, moisture, ash, and gel count. The following sections provide the test-method and processing framework for converters evaluating this grade in blown film, extrusion coating, and heat-sealed packaging.
Classification of Air Tech LDPE 60 under ISO 1872-1 places the material in the PE-LD family, for which density is reported at 23 °C and melt mass-flow rate at 190 °C under 2.16 kg. Lot-to-lot processability cannot be established from a single average value; it requires a shear-viscosity curve and a standardized film test. The following methods are used as a qualification matrix.
| Property | Standard method | Specimen or condition | Purpose |
|---|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 190 °C, 2.16 kg | comparison with supplier lot certificate |
| Density | ISO 1183-1:2019 | 23 °C | chain packing and crystallinity |
| Tensile yield strength | ISO 527-2:2012 | type 5A, 50 mm/min | mechanical acceptance |
| Water content | ISO 15512:2019 | granules as received | drying decision and silver-streak prevention |
| Ash content | ISO 3451-1:2019 | 600 °C | slip and antiblock loading verification |
| Gel count | converter-specific | 70 μm cast film | optical defect level |
Because LDPE surface slip develops through migration of erucamide or similar amide additives, film coefficient of friction should be tracked over time. ASTM D1894 static and kinetic COF measurements at 24 h, 7 days, and 28 days after extrusion reveal the bloom rate. This aging variable causes batch-to-batch differences on packaging lines even when the polymer melt index is unchanged.
Film optics for LDPE packaging are quantified by haze under ASTM D1003, clarity under ASTM D1746, and gloss at 60° under ASTM D2457. LDPE usually gives higher haze than metallocene LLDPE at equivalent thickness, and the addition of antiblock silica increases haze further. Slip additives reduce COF but can plate out on chill rolls and alter downstream bag-making friction. For Air Tech LDPE 60, the converter should verify whether the grade carries a standard slip/antiblock package or is a barefoot resin, because this determines downstream blending and masterbatch addition levels.
On high-stalk blown film lines using 90 mm single-screw extruders with 30:1 L/D, conventional low-density polyethylene is often screened at melt temperatures of 160 °C to 200 °C, a die gap of 0.8 mm to 1.2 mm, and a blow-up ratio of 2.0:1 to 3.0:1. These ranges are not specific to Air Tech LDPE 60; they serve as a starting envelope, and the final window must be derived from capillary rheometry and pilot-line bubble stability. Production-scale experience shows that bubble instability appears when melt pressure variation across the screen pack exceeds 0.5 MPa, while die-lip condensation at relative humidity above 60% creates pinhole-like surface defects before frost-line movement is visible. Surface-moistened granules are typically dried for 2 h at 60 °C; drying above this temperature in air can oxidize the polymer surface and increase gel counts.
Extruder hardware suitable for LDPE film includes a single-stage barrier screw with a compression ratio of 2.5:1 to 3.5:1 and a low-shear Maddock mixing section. Screen packs of 40/60/100 mesh balance melt cleanliness against pressure drop; a pressure rise above 5 MPa across the pack indicates gel accumulation or filter blockage. Melt temperature at the die should be maintained within ±3 °C of the established set point because wider excursions change local viscosity enough to alter gauge uniformity. In blown film, capacitance thickness scanning is used for gauge control; ±5% of target is a common control limit, while ±10% excursions create roll telescoping and print misregister.
High-pressure LDPE grades associated with the PE-LD family are separated from LLDPE and HDPE by long-chain branching and broad molecular weight distribution. Long-chain branching increases melt extension and bubble stability but lowers dart impact and Elmendorf tear when compared with narrow-distribution metallocene LLDPE at 25 μm monolayer thickness. Comparative evaluations should be run under ASTM D1709, ASTM D1922, and ASTM D882. HDPE with density 0.945 g/cm³ to 0.960 g/cm³ provides higher modulus and heat resistance but is not used for high-clarity film because crystallinity increases haze. LLDPE offers higher toughness and downgauging potential but has lower melt strength and usually requires narrower die gaps or higher motor load. Published data for this specific configuration is limited, so direct product-to-product comparison is valid only when film samples are produced on the same line at the same frost line height and draw-down ratio.
Rheological discrimination between LDPE and linear polyethylene is obtained from small-amplitude oscillatory shear. The complex viscosity ratio from 0.1 rad/s to 100 rad/s is significantly higher for LDPE because of long-chain branching, and tensile strain hardening is observed in LDPE but not in linear LLDPE. This strain hardening stabilizes the bubble in blown film and reduces neck-in in extrusion coating. For blends, LDPE is commonly added to LLDPE at 10% to 30% by weight to increase bubble stability; above 30% LDPE, heat-seal initiation temperature increases and hot-tack strength can decline.
Capillary rheometry on LDPE reveals sharkskin at wall shear stresses above 0.10 MPa to 0.14 MPa, depending on molecular weight distribution and die material. Air Tech LDPE 60 should be screened for sharkskin using a laboratory extrusion line at increasing screw speed; the observed onset is recorded as the maximum stable output. Production lines with worn screw flights or damaged die lips can initiate melt fracture at lower throughput than laboratory data indicates. Adding polymer processing aids containing fluoropolymers can reduce sharkskin and die deposit, but the addition level, typically 200 ppm to 500 ppm, must be adjusted to avoid slip in the extruder feed section.
In coextruded structures, LDPE is used as the sealant layer, often blended with LLDPE or EVA. The choice to use Air Tech LDPE 60 in the sealant layer depends on the required heat-seal initiation temperature, hot-tack range, and interlayer adhesion. The final sealant must be tested on the packaging machine because seal-bar pressure, dwell time, and film temperature at the jaw are not captured by standardized laboratory tests alone. Failure modes on production lines include seal contamination, back-side heat sealing through the film, and seal transfer to the jaw; these are influenced by slip additive bloom and the degree of oxidation at the film surface.
In extrusion coating, conventional LDPE is processed at melt temperatures between 280 °C and 325 °C depending on screw design and coat weight. These conditions are not transferable to Air Tech LDPE 60 without extensional viscosity and neck-in measurements on a pilot coater. LDPE’s long-chain branching reduces neck-in and permits high draw-down, but the same branching lowers output per rpm compared with linear polyethylene. For monolayer coating at 15 g/m² to 25 g/m², converter trials should monitor melt curtain stability, web adhesion, and pinhole density. Recycled LDPE addition above 20% by weight is known on production lines to increase gel-induced web breaks, particularly with die gaps below 0.5 mm.
High-pressure free-radical polyethylene reactors run at pressures of 150 MPa to 300 MPa and temperatures of 150 °C to 300 °C. Short-chain branching is created by intramolecular backbiting, while long-chain branching is produced by intermolecular chain transfer. The ratio of these structural features determines the balance among clarity, melt strength, and heat-seal response. Variability in high-pressure separator efficiency can shift low molecular weight tails and raise extractables. In such cases, converters observe batch-to-batch shifts in haze, seal initiation, and gel count even when melt mass-flow rate remains inside specification. Incoming material of this grade should therefore be tracked by reactor lot and not by trade name alone.
Differential scanning calorimetry at a heating rate of 10 K/min under ISO 11357-3 typically places LDPE melting temperature between 105 °C and 115 °C; the heat-seal initiation temperature is generally 10 °C to 20 °C higher for LDPE than for metallocene LLDPE at equal density. Seal-strength curves should be generated under ASTM F88 and hot-tack windows under ASTM F1921 before specifying this grade in high-speed vertical form-fill-seal packaging.
Adhesion to paper, aluminum foil, and oriented substrates in extrusion coating is controlled by oxidation of the melt curtain and by substrate pre-treatment. If melt temperature is below 280 °C, oxidation is insufficient and adhesion to foil is lower; if above 325 °C, molecular weight degradation accelerates and odor increases. The air gap, typically 75 mm to 250 mm, also controls oxidation time. These operational boundaries are affected by molecular weight distribution, so they should be revalidated for each lot of Air Tech LDPE 60 when the end use demands foil adhesion.
Blocking tendency of LDPE film depends on surface smoothness, antiblock concentration, and storage pressure. Film-to-film blocking force is measured by ASTM D3354; high-blocking film may be unacceptable for automatic bag machines and can cause failures in frozen food packaging. This is a known downstream limitation when antiblock particle size or loading is reduced to improve optical clarity.
For migration-sensitive applications, raw material documentation for Air Tech LDPE 60 should include a statement of compliance with FDA 21 CFR 177.1520 and with Regulation (EU) No 10/2011 for overall migration below 10 mg/dm² under the assigned food simulant. Compliance cannot be established from polymer type alone; the final article must be tested in the fully formulated and processed state because additives, oxidation products, and surface contamination contribute to overall migration. If the finished article is within scope, RoHS homogeneous material limits of 0.1% by weight for lead, mercury, and hexavalent chromium and 0.01% for cadmium should be confirmed under EN IEC 63000. Processing over copper-containing contact surfaces above 200 °C should be avoided because copper ions accelerate oxidative chain scission.
