| HS Code | 916732 |
| Polymer Type | High-density polyethylene (HDPE) |
| Density | 0.952 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 0.2 g/10 min |
| Melting Temperature | 131 °C |
| Crystallization Temperature | 116 °C |
| Vicat Softening Temperature | 124 °C |
| Tensile Modulus | 1300 MPa |
| Tensile Stress At Yield | 28 MPa |
| Tensile Strain At Yield | 9 % |
| Tensile Strain At Break | >600 % |
| Charpy Notched Impact Strength 23 C | 10 kJ/m² |
| Shore D Hardness | 62 |
| Water Absorption | <0.01 % |
As an accredited Borealis HDPE FB1520 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borealis HDPE FB1520 is supplied in 25 kg polyethylene bags, stacked on 1,000 kg pallets and wrapped in protective film. |
| Container Loading (20′ FCL) | Borealis HDPE FB1520 loaded in 20′ FCL; 25 kg bags on pallets, stretch-wrapped and secured; exact quantity per packing list. |
| Shipping | Borealis HDPE FB1520 ships as non-hazardous solid polyethylene pellets. Typical packaging: 25 kg bags, 1,000 kg big bags, or bulk truck/silo. Transport in dry, covered conveyances, avoiding moisture, contamination, heat, and direct sunlight. Not classified as dangerous goods under ADR/RID/IMDG/IATA. |
| Storage | Store Borealis HDPE FB1520 in a cool, dry, well-ventilated warehouse. Keep in original, sealed packaging, away from direct sunlight, heat, flames, and strong oxidizers. Avoid moisture, dust, and contamination. Stack pallets securely and limit height to prevent deformation or bag damage. Maintain stable ambient conditions, observe good housekeeping, and use first-in, first-out stock rotation. |
| Shelf Life | Borealis HDPE FB1520 typically has a two-year shelf life when kept dry, in unopened original packaging, protected from direct sunlight. |
On high-output blown film lines equipped with grooved-feed extruders of L/D 25:1 to 30:1 and die diameters between 160 mm and 350 mm, HDPE FB1520 is processed at melt temperatures of 190–215 °C. The incoming resin is checked using ISO 1133-1:2022 for melt-flow rate and ISO 1183-1:2019 for density; the grade typically falls below 1.0 g/10 min at 190 °C/2.16 kg and within the 0.950–0.958 g/cm³ density band. The die gap is maintained at 0.8–1.2 mm, blow-up ratio is held between 2.5:1 and 3.5:1, and frost-line height is set at 8–12 die diameters to stabilize bubble geometry. Thickness tolerance is controlled within ±5% through segmented air rings and internal bubble cooling. Compliance for this converted-article class includes EN 13592:2017 for household refuse sacks, ISO 527-3 for film tensile properties, ISO 6383-2 for Elmendorf tear, and ASTM D1709 for dart drop impact. Where food-contact liners are produced, the converter must verify FDA 21 CFR 177.1520 and EU 10/2011, the latter requiring overall migration testing under EN 1186-1 and specific migration testing for any masterbatch constituents. The formulation addition ratio on heavy-duty liner runs is typically 80–85 wt% virgin FB1520, 10–15 wt% post-industrial trim scrap, 1.5–2.5 wt% slip/antiblock masterbatch, and 0.05–0.15 wt% polymer processing aid when melt fracture or gauge instability appears at high throughput. The downstream process is continuous vertical blown film extrusion with collapsing frames, corona treatment to 36–42 dyn/cm when print adhesion is required, and in-line slitting or gusseting. Terminal product types include heavy-duty refuse sacks, industrial liners, construction debris sacks, and retail carrier films. Operational boundaries include hopper drying at 70 °C for 2 h when ambient humidity exceeds 60% RH; melt temperatures above 220 °C should be avoided because gel formation increases and bubble stability degrades.
Extrusion blow moulding of detergent and household chemical bottles with FB1520 imposes a narrow melt-temperature window because low shear-rate viscosity controls parison sag in monolayer shuttle machines. On continuous-extrusion and accumulator blow moulding lines with clamp forces from 12 tonnes to 25 tonnes for containers between 500 mL and 5 L, the melt temperature is normally kept at 180–200 °C. Parison swell of 40–70% is managed through parison programming that thins the top and bottom pinch-off zones and increases wall thickness in the body. Blow air pressure is set between 0.6 MPa and 0.9 MPa, and mold temperature is maintained at 10–20 °C to reduce cycle time without inducing excessive internal stress. Compliance for this downstream sector includes REACH Annex XVII restrictions for hazardous substances, EU 1272/2008 CLP classification when the filled chemical formulation is relevant to packaging safety, and FDA 21 CFR 177.1520 where bottles are intended for food or pharmaceutical use. The formulation addition ratio at the hopper typically consists of 60–80 wt% virgin FB1520, 10–30 wt% post-consumer recycled high-density polyethylene from closed-loop detergent bottle streams, 2–4 wt% color concentrate, and 0.5–1.5 wt% processing aid. The downstream production process involves gravimetric dosing, single-screw extrusion with a grooved-feed section of L/D 24:1 to 28:1, continuous parison extrusion into a shuttle mold, blowing, cooling, deflashing, and leak testing under 25–40 kPa internal pressure. Terminal product types include laundry detergent bottles, household bleach containers, wet-wipe canisters, and automotive coolant bottles. In bleach-containing applications, converters should qualify environmental stress-cracking resistance by ASTM D1693 on molded specimens; recycled content above 30 wt% may reduce the stress-cracking margin after long-term oxidative exposure.
Post-consumer recyclate addition above 20 wt% in large-part extrusion blow moulding shifts the dominant failure mode from ductile deformation under drop load to low-stress environmental stress cracking at weld lines and pinch-off seams. In UN-rated jerrican production using FB1520, the accumulator head is typically operated with extruders of L/D 24:1 to 30:1, a parison programmer with 50–100 point wall-thickness control, and clamp force above 35 tonnes. The melt temperature window is 180–205 °C, but high-PCR blends frequently demand a narrower range of 185–195 °C to limit viscosity variation from mixed melt-flow fractions. Formulation addition ratios are typically 70–85 wt% FB1520, 10–25 wt% washed post-consumer HDPE, 1–2 wt% UV stabilizer masterbatch for outdoor-stored containers, and 0.1–0.3 wt% antioxidant top-up when recycled material shows oxidative degradation. The production process weaknesses are concentrated at the pinch-off seam: too much recycled content introduces low-molecular-weight fractions that reduce weld strength, while insufficient parison wall thickness at the seam produces incomplete fusion. Terminal products include 10–25 L UN-rated jerricans for industrial chemicals, agrochemical containers, and automotive fluid packs. Compliance for dangerous goods packaging requires UN 6.1.5 drop and leakproofness testing, stacking tests according to ISO 2248, and ESCR qualification by ASTM D1693 on samples taken from the mold seam. Published data for FB1520-specific PCR blends is limited; converters must qualify batch-specific ESCR and weld-line impact rather than rely on virgin-grade datasheets. Operational boundaries include pre-drying of PCR above 60% RH at 85–95 °C for 3–4 h, and magnetic/non-ferrous metal separation upstream of the hopper because mixed recyclate streams introduce fine particulates that block screen packs.
In coextruded dry-food liner structures where LLDPE contributes seal initiation at 75–85 °C and FB1520 supplies stiffness and moisture barrier, the layer distribution is set to maintain seal integrity while preventing excessive film curl. A three-layer blown film die is typically configured with a 1.5 mm die gap, blow-up ratio of 2.0:1 to 2.8:1, and melt temperatures of 190–210 °C for the HDPE core and 170–190 °C for the LLDPE seal layer; the outer layer may contain 2–4 wt% slip and antiblock masterbatch to control coefficient of friction and blocking. Compliance is governed by EC 1935/2004, EU 10/2011, EC 2023/2006 for GMP, and FDA 21 CFR 177.1520 for the olefin core and seal layers when the structure is sold into U.S. food packaging. The formulation addition ratio across the structure is typically 55–70 wt% FB1520 in the core, 20–30 wt% linear low density polyethylene in the seal layer, 10–15 wt% post-industrial trim scrap in the outer layer, and 2–4 wt% additive masterbatch. The downstream production process involves separate gravimetric dosing per layer, air-ring cooling with chilled air, bubble collapsing, in-line surface treatment to 36–42 dyn/cm, and slitting without edge trim contamination. Terminal product types include cereal liner bags, cracker and dry snack liners, biscuit wrap, and frozen food liner films. The key operational boundary is interlayer distortion: differences in melt strength between HDPE and LLDPE require precise outer/skin melt-temperature control; if the core layer exceeds 215 °C, film blocking and gels become more frequent. Published data for specific coextruded water-vapor transmission rates on FB1520 structures is limited to converter trials; laboratory values should be verified by ISO 15106-1 at 23 °C and 50% RH.
Sheet extrusion of FB1520 for shallow thermoformed trays tends to be specified when high-density rigidity and puncture resistance outweigh the need for deep-draw polypropylene behavior. In flat-die sheet lines of 800–1200 mm working width, the melt temperature is held at 190–210 °C, the die gap is set at 1.5–2.5 mm, and a three-roll calendering stack is operated at 80–100 °C to produce sheet of 0.5–2.5 mm thickness. The formulation addition ratio for stable sheet is typically 70–85 wt% FB1520, 15–25 wt% recycled HDPE from thermoformed scrap, 0.05–0.2 wt% nucleating agent to accelerate crystallization, and 1–2 wt% color concentrate. Compliance for food-contact trays requires FDA 21 CFR 177.1520 and EU 10/2011; industrial dunnage is usually assessed under ISO 9001 process control without food-contact certification. During thermoforming, sheet is heated to 180–210 °C, formed with plug assist at 0.5–0.8 MPa air pressure, and trimmed in-line; scrap regrind is reintroduced at the sheet extruder within the 15–25 wt% limit to avoid excessive viscosity drift. Terminal product types include industrial transit trays, dunnage sheet, stackable food trays for dry goods, and agricultural propagation trays. Operational boundaries include roll-stack temperature below 100 °C to prevent sheet blocking and above 80 °C to limit frozen-in orientation; sheet moisture above 0.05% before thermoforming may require pre-drying at 75 °C for 2–3 h.
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Borealis HDPE FB1520 is presented as a bimodal high-density polyethylene blown-film resin manufactured under the Borstar polymerisation platform. The grade is designated for thin-gauge blown film, where the combination of melt strength, bubble stability, and stiffness determines whether the film can be down-gauged without losing tensile integrity. The product is differentiated from conventional unimodal HDPE film grades by its molecular weight distribution: the high-molecular-weight fraction contributes orientation resistance and melt strength, while the lower-molecular-weight component reduces shear viscosity during extrusion. The supplier’s published nominal values place the density at 0.952 g/cm³ under ISO 1183-1 and the melt mass-flow rate at 0.15 g/10 min under ISO 1133-1 at 190 °C with a 2.16 kg load. These values are classed as high-density polyethylene and low-melt-flow film extrusion. The low MFR is deliberate: it preserves molecular weight for bubble stability and mechanical strength in films as thin as 10 µm to 25 µm, but it also requires extrusion equipment capable of generating sufficient pressure without excessive shear heating. The grade is not intended as a sealant layer; it is used as a stiffness core, as a monolayer film where rigidity and thin-gauge integrity are required, or in coextruded structures where another resin supplies seal initiation and impact toughness.
The bimodal molecular weight distribution of FB1520 modifies the shear viscosity curve in a way that is not observed in unimodal grades of equivalent density and MFR₂.₁₆. The high-molecular-weight tail of the distribution raises the zero-shear viscosity and stabilises the blown-film bubble during stretching, while the low-molecular-weight fraction improves flow through the die and lowers melt pressure. This combination supports a wider operating envelope on high-output lines. In practice, processors operating grooved-feed single-screw extruders with an L/D ratio between 25:1 and 30:1 can achieve higher specific output relative to a unimodal HDPE grade of the same density and melt index, although the measurable gain depends on screw geometry, die gap, and cooling air temperature. The melt temperature is typically maintained between 190 °C and 220 °C; excursions above 230 °C increase the risk of oxidative gel formation and should be avoided during prolonged residence times. Because the viscosity of the bimodal grade changes with temperature, bubble geometry is sensitive to barrel-zone overshoot. Fluctuations greater than ±5 °C in the melt stream can displace the frost line and cause gauge variation, particularly at stalk heights above 8 die diameters.
Die gap selection influences the shear stress at the die lip and therefore the onset of melt fracture. When FB1520 is run through a die gap of 1.2 mm to 1.8 mm, the bubble is typically blown at a blow-up ratio of 3:1 to 5:1. At the lower end of the die gap range, higher shear rates can produce sharkskin surface defects before the film reaches the frost line; widening the die gap or lowering output brings the melt back into the stable window. The low MFR of the grade also means that the extruder head pressure will be higher than that of an LLDPE film resin at the same output. Extruders used for this product therefore benefit from a pressure capability of at least 300 bar and good control of melt temperature through the adapter and die. Capillary rheometry under ISO 11443 provides shear viscosity data at processing shear rates; these values are more useful for die design than the low-shear MFR value alone. Published data for this specific configuration is limited, so the exact output ceiling must be established on the individual line.
The shear-thinning response of the bimodal polymer reduces viscosity in the shear-rate range typical of blown-film dies. HDPE film extrusion commonly operates at die shear rates from 100 s⁻¹ to 1000 s⁻¹. For HDPE, the critical shear stress for melt fracture is generally in the range of 0.1 MPa to 0.4 MPa; exact values for FB1520 are not standard datasheet entries and must be confirmed on a capillary rheometer or by line trial. Bubble stability is also affected by cooling air temperature and frost-line height. With internal bubble cooling, the frost line can be maintained within a narrow band. If the frost line is too high, bubble flutter and gauge variation increase. If it is too low, rapid quenching raises haze and may reduce impact strength. Film properties are anisotropic because HDPE blown film develops molecular orientation during stretching. Machine-direction stiffness is usually higher than transverse-direction stiffness, while tear resistance is often higher in the transverse direction. Blow-up ratio and take-off speed control the balance of orientation. A blow-up ratio near 4:1 produces more balanced orientation than a blow-up ratio of 2:1. The high molecular weight of FB1520 permits higher stalk heights, which increases machine-direction orientation and tensile strength, a property measured under ISO 527-3.
On high-output monolayer blown-film lines, the grade is commonly extruded with a flat temperature profile, with the feed zone cooled to prevent premature melting and the compression section operating at moderate screw speed. Output is usually limited not by drive torque but by bubble instability when the frost line is pushed too high. Adding an internal bubble cooling system improves heat removal and permits a higher stalk height without bubble flutter. When monolayer films are converted into T-shirt bags, side-weld bags, and folded-gusset liners, the film must combine high stiffness with sufficient elongation. Tensile properties are determined according to ISO 527-3 using 500 mm/min test speed; impact resistance is evaluated under ISO 7765-1 Method A. Because the values are strongly thickness-dependent, a single dart-drop number is not transferable across different films. Grades in this class typically exhibit higher modulus than LLDPE film grades of equal gauge, but lower puncture and tear resistance than an LLDPE-rich blend at the same thickness. This is the reason FB1520 is frequently used in coextruded structures rather than as a pure monolayer film where high tear propagation resistance is the primary requirement.
When FB1520 is coextruded with linear low-density polyethylene seal layers, the structure is designed to combine the high stiffness of HDPE with the high dart impact and seal initiation temperature of LLDPE. In a three-layer die, the HDPE core is typically placed in the central layer, with LLDPE skins of 20% to 40% of the total gauge. The melt streams are kept separate until the die, and the die gap is often set between 1.4 mm and 2.0 mm to manage the viscosity difference between the two resins. If the viscosity ratio between the HDPE and LLDPE layers becomes too large, interfacial instability can occur at the layer interface. This is controlled by raising the skin-layer melt temperature or by selecting an LLDPE grade with a lower melt viscosity. The HDPE core retains the bubble during film blowing; the LLDPE skins contribute seal strength and dart impact. Film converted from this structure is tested for dart impact under ISO 7765-1, tear resistance under ISO 6383-2, and seal initiation temperature using a laboratory heat-seal tester. Published data for the exact layer ratio and sealant-grade combination should be obtained from the film producer, because seal strength is influenced by seal-bar temperature, dwell time, and sealing pressure.
Thin-gauge T-shirt bag conversion places particular demands on the film’s ability to survive rapid film acceleration, folding, and sealing. The HDPE stiffness prevents the film from stretching excessively on bag machines, but the same stiffness lowers the tear initiation resistance in the transverse direction. The film’s machinability is assessed by the coefficient of friction against metal and rubber rollers, by the blocking tendency, and by the tensile modulus. The supplier’s datasheet is not sufficient to predict performance on a specific bag machine; trials are required because the film path, dwell time, and seal-bar geometry differ between converting lines. The stiffness of FB1520 in high-density films also permits a reduction in gauge compared with a lower-density LLDPE film while maintaining the same tensile force at the bag handle. That substitution is not universal: in applications where impact against sharp objects is frequent, LLDPE films or HDPE/LLDPE blends are retained. The downgauging limit is normally set by the minimum dart drop value required by the converter, measured under ISO 7765-1.
Compared with low-density polyethylene, FB1520 has a higher density and crystallinity. The higher crystalline fraction increases tensile modulus but reduces clarity and tear resistance. LDPE has higher melt strength at equivalent MFR because of long-chain branching, but its tensile strength is lower. In a blend, LDPE is sometimes added to HDPE to improve bubble stability and optics; the addition level is limited because it lowers stiffness and may shift the density below the target. Compared with C6 or C8 LLDPE, FB1520 has greater stiffness and lower impact and tear propagation resistance. The melt point of HDPE is also higher, giving better thermal resistance in warm-environment applications, but the seal initiation temperature is inferior. These differences are measured by ISO 527-3, ISO 7765-1, and ISO 6383-2. Compared with a unimodal HDPE film grade, the bimodal distribution of FB1520 produces a lower melt viscosity at high shear and a higher melt viscosity at low shear. Processors may observe a lower motor load at equal output and better bubble stability at high stalk heights. The ratio of MFR at 5 kg to MFR at 2.16 kg is sometimes used as a relative indicator of molecular weight distribution. The supplier’s data indicates a higher ratio than that of a typical unimodal HDPE, which is consistent with the bimodal architecture. Users should not replace the supplier’s rheological data with MFR alone.
The supplier’s material datasheet reports the polymer properties under standardised conditions. Density is measured by ISO 1183-1 and melt flow rate by ISO 1133-1. Tensile modulus and tensile strength of film are determined according to ISO 527-3; dart drop impact is measured under ISO 7765-1 Method A; Elmendorf tear is measured under ISO 6383-2. The following table lists the principal standards used for compliance and quality assurance.
| Standard | Scope | Remarks |
|---|---|---|
| ISO 1183-1 | Density of plastics | Determines classification as high-density polyethylene |
| ISO 1133-1 | Melt mass-flow rate | Measured at 190 °C and 2.16 kg |
| ISO 527-3 | Tensile properties of film | Test speed 500 mm/min; thickness-dependent |
| ISO 7765-1 | Free-falling dart impact | Method A; values depend on film gauge |
| ISO 6383-2 | Elmendorf tear resistance | MD and TD values reported separately |
| ISO 11443 | Capillary rheometry | For shear viscosity at processing shear rates |
| FDA 21 CFR 177.1520 | Olefin polymer food-contact use | Requires current supplier compliance statement |
| EU Regulation No 10/2011 | Plastic food-contact migration | Migration limits depend on food type and film thickness |
| Regulation (EC) No 1907/2006 | REACH | Chemical safety compliance in the European Union |
| Directive 2011/65/EU | RoHS | Restriction of hazardous substances |
The differentiation from other products can be expressed in the following comparative terms. The comparison is qualitative because numerical values depend on film thickness, extrusion conditions, and coextrusion structure.
| Parameter | Borealis HDPE FB1520 | Unimodal HDPE film grade | LLDPE C4 film grade | Test method |
|---|---|---|---|---|
| Density | 0.952 g/cm³ | 0.950 g/cm³ to 0.960 g/cm³ | 0.918 g/cm³ to 0.922 g/cm³ | ISO 1183-1 |
| MFR 190 °C/2.16 kg | 0.15 g/10 min | 0.2 g/10 min to 1.0 g/10 min | 0.8 g/10 min to 1.2 g/10 min | ISO 1133-1 |
| Melt strength at equal MFR | Higher | Lower | Much lower | Production-scale bubble stability |
| Film stiffness | High | High | Low to medium | ISO 527-3 |
| Dart impact at equal gauge | Moderate | Moderate to low | High | ISO 7765-1 Method A |
For storage and handling, the granules should be kept dry and protected from direct sunlight. Surface moisture from condensation or outdoor storage at relative humidity above 85% can produce bubble defects and surface blemishes, although HDPE does not absorb moisture into the polymer matrix to the same extent as polar polymers. If surface moisture is present, a pellet dryer operating at 70 °C for 2 hours is normally sufficient. The product should not be exposed to oxidising conditions at high temperature for long residence times; purging with a low-MFR polyethylene or a commercial purge compound is recommended after extended shutdowns. Recycled film from FB1520 can be incorporated back into the film line, but the resulting gel count and mechanical properties depend on the quality of the in-line scrap stream and the number of regrind cycles. No amine-based processing additives should be introduced without verification, because such additives can interact with peroxide residues and shift the melt viscosity or cause discolouration at processing temperatures.
Regulatory compliance for food-contact applications must be verified against the current supplier statement. The base resin is generally represented as an olefin polymer under FDA 21 CFR 177.1520 and subject to migration limits under EU Regulation No 10/2011 when used in the appropriate thickness and food type. Industrial hygiene and environmental compliance is assessed under Regulation (EC) No 1907/2006 for REACH and Directive 2011/65/EU for RoHS. These statements are grade-specific and export-market-specific; a certificate of compliance must be obtained from the supplier before use in regulated packaging. Published data for this specific configuration is limited where the final film structure contains recycled content or non-Borealis additives.
