| HS Code | 946576 |
| Density | 0.953 g/cm³ |
| Melt Flow Rate | 0.35 g/10 min at 190°C/2.16 kg |
| Tensile Strength At Yield | 26 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1.10 GPa |
| Hardness Shore D | 66 |
| Vicat Softening Point | 127 °C |
| Heat Deflection Temperature At 0 46 Mpa | 75 °C |
| Brittleness Temperature | -70 °C |
| Environmental Stress Crack Resistance | >1000 h |
| Water Absorption | <0.01% |
| Dielectric Constant | 2.3 |
| Volume Resistivity | >1E15 ohm·cm |
| Thermal Conductivity | 0.45 W/m·K |
| Coefficient Of Linear Thermal Expansion | 1.2E-4 cm/cm/°C |
| Mold Shrinkage | 0.015–0.030 cm/cm |
As an accredited Bamberger Polymers HDPE 350F factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Bamberger Polymers HDPE 350F is typically packaged in 25 kg (55 lb) polyethylene bags, 40 bags per 1,000 kg pallet. |
| Container Loading (20′ FCL) | 20′ FCL containing palletized 25 kg bags of Bamberger Polymers HDPE 350F, shrink-wrapped, evenly distributed, secured for ocean transport. |
| Shipping | Bamberger Polymers HDPE 350F is shipped as non-hazardous HDPE resin pellets, typically in 25 kg bags, octabins, or bulk trucks/railcars. It requires no special DG placarding. Store in cool, dry conditions away from direct sunlight, moisture, and contamination. Follow standard material handling and safe palletizing practices. |
| Storage | Store Bamberger Polymers HDPE 350F in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and flames. Keep containers tightly closed to prevent moisture and contamination. Avoid contact with strong oxidizers. Do not overstack; use first-in, first-out inventory. Maintain clean, dust-free conditions, minimize pellet spillage, and keep away from food, feed, and drinking water. Follow local regulations. |
| Shelf Life | Shelf life is indefinite under proper storage: keep in original packaging, cool, dry, away from direct sunlight and contaminants. |
Bamberger Polymers HDPE 350F is a high-molecular-weight high-density polyethylene grade characterized by a nominal density of 0.950 g/cm³ under ASTM D1505-18 and a melt flow rate of 0.35 g/10 min under ASTM D1238-20 at 190 °C/2.16 kg. The low melt flow rate and resulting high melt tension place the grade in conversion routes that require melt strength, environmental stress-crack resistance, and gauge control rather than thin-wall injection molding flow. Downstream processors using this grade select it for high-stalk film extrusion, extrusion blow molding of industrial containers, heavy-gauge sheet, and geomembrane sheet. Finished-article compliance remains the responsibility of the converter because additive masterbatches, regrind sourcing, and processing temperatures affect final regulatory status.
At 0.35 g/10 min melt flow and 0.950 g/cm³ density, HDPE 350F is processed on high-stalk blown film lines for thin-gauge sacks and liners where film gauge is typically 10–50 µm and throughput per die diameter is controlled by bubble stability rather than screw recovery capacity. The relevant material compliance for food-contact applications rests on 21 CFR 177.1520(c), with European food-contact use subject to Regulation (EU) No 10/2011 migration testing under simulant A and D2; non-food retail packaging is specified under ASTM D4976-22. Formulation on production lines commonly uses 100 wt% virgin HDPE 350F for thin-gauge high-speed lines, while integrated bag lines add 15–25 wt% post-industrial edge trim regrind; slip and antiblock concentrates are metered at 1.0–2.5 wt% depending on layflat width and downstream converting friction requirements. The extrusion hardware consists of grooved-feed extruders from 50 to 65 mm diameter with L/D ratios of 24:1–30:1, die gaps of 1.0–1.8 mm, blow-up ratios from 3:1 to 5:1, and stalk heights maintained between 6 and 10 die diameters to align the high-molecular-weight melt before frost-line crystallization. Melt temperatures typically range from 190 to 220 °C; internal bubble cooling is used above 100 kg/h output to remove exothermic heat and reduce blocking. Finished product types from this route include T-shirt grocery sacks, merchandise bags, and industrial refuse liners; the limiting failure mode observed on production lines is dart-drop loss when regrind exceeds 25 wt% or when the frost line is raised above 8 die diameters, which increases crystalline orientation imbalances in high-stalk configurations. The draw-down ratio from a 1.5 mm die gap to 10 µm final film is 150:1, and maintaining a stable high-stalk bubble under this ratio requires the melt to retain sufficient elastic recovery after the freeze line; excessive frost-line height reduces transverse direction tear resistance, while a collapsed stalk below 6 die diameters transfers unrelaxed stress into the film and raises bag splitting during high-speed conversion.
Extrusion blow molding of tight-head containers from HDPE 350F is governed less by resin certification than by the finished packaging performance tests in 49 CFR 178.509 for UN-rated jerrycans, drop and stack tests in ASTM D4919-17, and food-contact status under 21 CFR 177.1520(c) where edible oils or aqueous foods require migration testing under Regulation (EU) No 10/2011. The formulation window is process-dependent: for UN-rated hazardous-material service, 100 wt% virgin HDPE 350F is retained to avoid reductions in environmental stress-crack resistance, while general industrial service permits up to 25 wt% flash regrind after in-line granulation and magnetic separation; color concentrates are added at 1–3 wt%, and outdoor-storage grades incorporate 0.2–0.5 wt% hindered amine light stabilizer masterbatch. On accumulator-head machines, melt temperature is held at 180–210 °C, parison programming uses 20–30 points to compensate for sag, mold temperature is maintained at 10–25 °C, and clamp force for 5–25 L containers typically falls between 100 and 150 t. The high melt strength indicated by 0.35 g/10 min flow reduces parison drawdown at long hang times, but head pressure remains higher than with 0.7–1.0 g/10 min blow molding grades; screw back-pressure settings above 15 bar are avoided to prevent excessive shear heating at the pin and bushing. Terminal parts include 5 L, 10 L, 20 L, and 25 L jerrycans, stackable lubricant containers, and agrochemical tight-head bottles requiring top-load retention after drop testing. The operational boundary for regrind in chemical-contact service is ESCR loss; processors running 25–30 wt% regrind typically observe shorter F50 times under ASTM D1693-15b condition B depending on the residual content of incompatible migrated liquids from the first service cycle, so regrind from returned chemical containers is excluded from certified dangerous goods packaging.
Where sheet gauge variation must remain within ±0.05 mm across layflat widths exceeding 1,200 mm, HDPE 350F is run on flat-die extrusion lines with closed-loop gear pump pressure control rather than direct extruder-to-die transfer. Compliance for food-contact thermoformed trays references 21 CFR 177.1520(c) and Regulation (EU) No 10/2011; industrial dunnage intended for automotive or electronic material handling must also satisfy REACH SVHC screening and, where applicable, Directive 2011/65/EU RoHS recast substance restrictions. Typical sheet formulations use 70–100 wt% HDPE 350F with up to 30 wt% cleaned post-consumer recycled HDPE flake; color masterbatch is added at 2–5 wt%, and antioxidant masterbatch at 0.1–0.3 wt% to preserve melt stability during start-stop thermoforming campaigns. Production equipment includes single-screw extruders of 75–120 mm diameter with 30:1 L/D ratio, barrier screws, gear pump melt delivery, flex-lip sheet dies from 1,200 to 2,400 mm width, and three-roll polishing stacks held at 60–90 °C roll surface temperature. Sheet thickness ranges from 0.5 to 6.0 mm; the high molecular weight of HDPE 350F improves thermoformed wall distribution but reduces melt conveying efficiency, so gear pump inlet pressure is kept between 50 and 80 bar. Finished products include reusable industrial dunnage trays, material handling totes, and cut-sheet panels for downstream bending and welding. The principal processing limitation occurs when recycled flake exceeds 30 wt% and melt pressure fluctuations exceed ±2 bar at the die inlet; this produces thickness banding that thermoforming stations cannot fully compensate for below 0.8 mm sheet.
In geomembrane applications, HDPE 350F is evaluated against the GRI-GM13 specification, which links tensile properties under ASTM D6693-04, notched constant tensile load stress-crack resistance under ASTM D5397-19, and oxidative induction time under ASTM D5885-06. The resin is typically formulated with 96.5–98 wt% HDPE 350F and 2.0–3.5 wt% carbon black masterbatch to achieve the mandated 2–3 wt% dispersed carbon black level; internal edge trim regrind is limited to 10 wt% because higher regrind loading shortens oxidative induction time and increases gel counts. Flat-die sheet extrusion uses melt temperatures of 210–240 °C, die gaps of 2.0–3.5 mm, and polished/stipple embossing rolls that produce sheet thicknesses from 1.0 to 3.0 mm and widths up to 7.5 m. The production bottleneck is carbon black dispersion: agglomerates above 10 µm act as stress concentration sites during ASTM D5397-19 single-point notched constant tensile load testing at 50 °C, so processors add carbon black masterbatch via high-shear feeders and maintain melt temperatures above 220 °C to reduce undispersed agglomerates. Terminal finished product types include landfill liner panels, mining heap leach pad liners, agricultural pond liners, and canal liners; the operational boundary is the oxidative induction time limit under GRI-GM13, which precludes direct use of post-consumer HDPE regrind in certified liner stock. An additional processing constraint is the upper melt temperature: above 240 °C, oxidative degradation reduces the standard oxidative induction time even when stabilizer packages are present, so the effective melt window is between 220 °C and 240 °C.
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Bamberger Polymers HDPE 350F is a fractional-melt high-density polyethylene resin positioned for blown film extrusion. Supplier trade data identify the grade by a nominal melt flow rate of 0.35 g/10 min at 190°C under a 2.16 kg load in accordance with ASTM D1238 and a nominal solid-state density of 0.950 g/cm³ in accordance with ASTM D1505. The alphanumeric designation 350F reflects the nominal 0.35 melt flow value and the F suffix used for film-extrusion product lines. These two coordinates distinguish the grade from higher-flow injection molding grades and higher-density fractional-melt blow molding grades, placing it in a class where melt strength and thin-gauge stiffness must be balanced against extruder backpressure and die-lip deposit sensitivity.
The material is supplied as a general-purpose film resin; therefore, the primary release specifications are melt flow rate and density. Lot-specific certificates of analysis control the actual values within the supplier’s published tolerance band. Mechanical properties, including tensile yield, Elmendorf tear, and dart drop, are not single-point material constants because they shift with film thickness, blow-up ratio, frost line height, and test specimen geometry. Any downstream specification established without production-line mapping is unreliable.
| Parameter | Test method or equipment reference | Nominal value |
|---|---|---|
| Melt flow rate | ASTM D1238, 190°C/2.16 kg | 0.35 g/10 min |
| Solid-state density | ASTM D1505 | 0.950 g/cm³ |
| Melt temperature at die | Infrared or melt thermocouple | 190–220°C |
| Blow-up ratio | Bubble diameter/die diameter | 2:1–4:1 |
| Frost line height | Vertical distance from die lip | 4–8 die diameters |
The table values are starting set points derived from blown film conversion of fractional-melt HDPE and are not intrinsic constants. They must be adjusted for extruder L/D ratio, die diameter, air ring configuration, and ambient plant humidity. Published data for this specific configuration is limited to supplier datasheet coordinates; high-speed monolayer film lines may require narrower or wider ranges depending on bubble cooling and internal bubble pressure control. Before setting release specifications, converters should differentiate between resin-determined properties and line-determined properties. Melt flow rate and density are resin-determined; dart drop, Elmendorf tear, and water vapor transmission rate are line- and thickness-determined.
In high-stalk tubular film conversion, the fractional melt flow of HDPE 350F produces a bubble with sufficient strain-hardening to remain stable at a neck height of 4–8 die diameters. The die gap is normally set between 0.9 mm and 1.5 mm. At melt temperatures below 185°C, the high-molecular-weight fraction remains partially elastic at the die lip and can initiate sharkskin or bubble chatter. Above 220°C, oxidative degradation at the screw tip and die surfaces produces low-molecular-weight fractions that migrate to the die lip and form deposits. The practical high-output window is therefore narrow; die pressure and melt temperature must be monitored together, not independently.
On grooved-feed extruders with 24:1–30:1 L/D and barrier screws, the resin generates backpressure that is highly sensitive to feed-throat temperature. Barrier screws with a low-shear Maddock mixer are preferred because the high-molecular-weight fraction requires dispersive mixing without excessive shear heating. If the feed throat is allowed to exceed 50°C, pellet deformation and bridging can occur at the feed port even though HDPE is not inherently hygroscopic. Condensate on cold pellets transferred from unheated silos or outdoor storage can create steam bubbles at the die; a conservative corrective step is drying at 80°C for 2 hours before processing. Such drying is not required for normal indoor silo conditions below 60% relative humidity.
A dual-lip air ring with adjustable lower lip flow is commonly used for high-stalk HDPE because the extended neck height requires controlled pre-cooling. Setting the lower lip flow to approximately one-third of total air volume can reduce bubble oscillation without over-developing machine-direction orientation. Melt pressure limits should follow the extruder manufacturer’s maximum screw torque and thrust bearing rating; extended operation above 450 bar on a 90 mm grooved-feed extruder accelerates screw and barrel wear even if the pressure transient does not trip the line’s safety interlock. For a 90 mm extruder with 30:1 L/D, barrel zone temperatures are typically set to 180°C, 190°C, 200°C, 205°C, and die zones at 210°C, with actual melt temperature measured at 200–215°C. Screw speed is not the primary control of output; die gap and backpressure set the throughput. If the die gap is reduced below 0.7 mm, melt fracture can appear before the melt temperature exceeds the upper bound. If the die gap is widened above 1.8 mm, the bubble becomes difficult to cool and frost line height increases beyond the stable window.
Under thin-gauge draw conditions of 10–25 μm, the density of 0.950 g/cm³ provides a secant modulus advantage over LLDPE but reduces dart drop performance relative to hexene- or octene-based film grades. Dart drop results obtained under ASTM D1709 Method A on 25 μm film are strongly affected by blow-up ratio, frost line position, and die gap; a datasheet value can only serve as a reference for the exact line conditions under which it was generated. Elmendorf tear strength under ASTM D1922 shifts with orientation: high-stalk operation tends to raise MD tear and reduce TD tear, while low-stalk operation produces the opposite bias. These effects must be mapped with production film samples before release targets are fixed.
Post-industrial trim can be reintroduced at up to 20 wt% in monolayer sack applications without destabilizing the bubble in most high-stalk line configurations. Higher recycled content reduces the melt strength of the blend and increases film thickness variability, particularly when the trim has been stored outside and carries surface moisture or oxidized skin. Regrind particle size should be matched to virgin pellet size to prevent feed segregation in the hopper. When HDPE 350F is coextruded or blended with LLDPE, the density and melt flow difference creates a viscosity mismatch that can produce layer instability if the LLDPE melt index is above 1.0 g/10 min. In such structures, a tie-layer or blend ratio below 30 wt% HDPE is commonly used to avoid interfacial melt fracture. The moisture vapor transmission rate of a 25 μm HDPE film is lower than that of an equal-thickness LLDPE film because of higher crystallinity; however, the absolute value must be measured under ASTM F1249 at the relevant humidity gradient.
In thin-film structures where a converter substitutes HDPE 350F for a 0.30 g/10 min, 0.955 g/cm³ fractional-melt blow molding grade, the 0.005 g/cm³ density reduction lowers tensile yield and flexural modulus but improves resistance to environmental stress cracking under ASTM D1693 notched constant-strain testing. The film-grade stabilization and molecular architecture are selected for thin-film bubble stability and draw, not for parison hang strength; therefore, this grade is not interchangeable with a blow molding grade in large-part bottle or drum applications where low-shear melt strength and parison sag resistance are the controlling requirements.
Compared with injection molding grades with melt flow rates of 8–20 g/10 min, HDPE 350F is unsuitable for high-flow thin-wall injection because its higher viscosity produces short shots and excessive shear heating at standard injection temperatures. That same viscosity is the source of the melt pressure needed for tubular film quenching and high-stalk stability. The difference is not merely a melt flow number: at equal density, a fractional-melt film grade has a broader molecular weight distribution and a different shear response than a higher-flow injection grade.
| Resin class | Nominal melt flow rate | Nominal density | Main conversion process | Directional effect of substitution |
|---|---|---|---|---|
| HDPE 350F | 0.35 g/10 min | 0.950 g/cm³ | Blown film | Reference |
| HDPE blow molding | 0.30 g/10 min | 0.955 g/cm³ | Extrusion blow molding | Higher stiffness and lower ESCR; better parison hang strength |
| HDPE injection molding | 8–20 g/10 min | 0.953–0.965 g/cm³ | Injection molding | Higher flow and lower melt strength; thin-wall fill capability |
| LLDPE film | 0.5–1.0 g/10 min | 0.918–0.925 g/cm³ | Blown film | Lower modulus, higher dart, lower moisture barrier |
The comparisons in the table are nominal and cannot be used as purchase specifications. They identify the directional changes that occur when HDPE 350F is evaluated against resins with different melt flow, density, or comonomer architecture.
Because the grade is not hygroscopic, the most common processing failure is not hydrolysis but pellet bridging caused by surface condensate or high feed-throat temperature. If the film line is located in a plant where ambient relative humidity exceeds 60% and silo surfaces are unheated, the pellets should be transferred to a conditioned hopper rather than fed directly. Drying at 80°C for 2 hours is a corrective measure, not a routine requirement. Resin stored beyond 12 months in hot warehouses may exhibit reduced antioxidant protection; oxidative induction time testing under ASTM D3895 is a prudent release check before film extrusion.
Additive compatibility should be verified by oxidative induction time testing under ASTM D3895 when blending with post-consumer recyclate, unsaturated processing oils, or transition-metal stearates. Amine-based additives are not typically required for HDPE film stabilization and may interact with acidic lubricants; such combinations should be avoided unless an accelerated aging study demonstrates no drop in OIT. A fluoropolymer processing aid at 200–600 ppm is frequently used in fractional-melt HDPE film lines to delay die-lip deposit formation; however, the additive can reduce surface energy and affect printing or corona treatment retention. Corona treatment levels should be revalidated after any change in processing aid concentration.
The grade is not formulated for UV stability. Outdoor exposure requires a carbon black or hindered amine light stabilizer masterbatch validated for the intended exposure duration. Continuous service at temperatures above 85°C is outside the design envelope for general-purpose HDPE film of this density class; in high-temperature stretch or shrink applications, the film softens, loses tensile strength, and exhibits excessive creep.
Direct food-contact status is not automatically conferred by the base resin type. Structures containing HDPE 350F and intended for food packaging must be evaluated under 21 CFR 177.1520. Paragraphs 3.1a and 3.2a specify density and extraction conditions for olefin polymers; the controlling document is a lot-specific letter of compliance from Bamberger Polymers. REACH compliance under EC 1907/2006 requires review of the safety data sheet for substances of very high concern above 0.1% w/w. RoHS Directive 2011/65/EU limits lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE in finished electrical and electronic equipment, not in raw HDPE resin; nonetheless, converters supplying RoHS-controlled assemblies should request supplier disclosure.
Published data for this specific configuration is limited beyond the nominal melt flow and density coordinates. Any application-specific claim, including food-contact status, UV resistance, or mechanical performance, must be verified with the lot-specific certificate of analysis, a supplier letter of compliance, and production-line trials on the target equipment.
