| HS Code | 764353 |
| Density | 0.949 g/cm³ |
| Melt Index | 0.35 g/10 min (190°C/2.16 kg) |
| Tensile Strength At Yield | 26 MPa |
| Tensile Strength At Break | 30 MPa |
| Elongation At Break | >600% |
| Flexural Modulus | 1200 MPa |
| Vicat Softening Temperature | 127 °C |
| Brittleness Temperature | < -70 °C |
| Hardness Shore D | 65 |
| Environmental Stress Crack Resistance | >1000 h |
| Thermal Conductivity | 0.45 W/m·K |
| Coefficient Of Linear Thermal Expansion | 1.2E-4 /°C |
| Dielectric Constant | 2.3 |
| Volume Resistivity | >1E16 ohm·cm |
| Water Absorption | <0.01% |
As an accredited Braskem HDPE GF4950 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Braskem HDPE GF4950 is supplied in standard 25 kg polyethylene-lined woven bags, palletized and stretch-wrapped for secure industrial shipping. |
| Container Loading (20′ FCL) | Braskem HDPE GF4950 is typically loaded in 25 kg bags on pallets; a 20′ FCL holds about 18–20 metric tons. |
| Shipping | Braskem HDPE GF4950 is a nonhazardous polyethylene resin shipped as pellets. Typical packaging includes 25 kg bags, bulk bags, or bulk trucks/railcars. Pallets should be stretch-wrapped and transported in clean, dry containers. Keep dry and away from heat and sunlight. Not classified as dangerous goods. Handle carefully to avoid package damage. |
| Storage | Store Braskem HDPE GF4950 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, ignition sources, and incompatible materials such as strong oxidizers. Keep original bags or containers closed, clean, and dry, preferably on pallets. Avoid moisture, dust, and contamination. Use first-in, first-out stock rotation. Consult the supplier’s SDS for specific handling and storage requirements. |
| Shelf Life | Shelf life is typically 24 months if stored unopened in a cool, dry, ventilated area away from sunlight and heat. |
Braskem HDPE GF4950 is transferred from rail hopper cars into centralised vacuum loading systems without pre-drying when internal moisture remains below 0.03 wt%. The resin has a melt mass-flow rate of 50 g/10 min under ASTM D1238 at 190 °C/2.16 kg and a nominal solid density of 0.956 g/cm³ under ASTM D1505, placing it in the high-flow injection molding band for short-cycle thin-wall dairy packaging. At wall sections of 0.6–0.8 mm, the melt temperature is maintained at 220–250 °C and the mould surface temperature is held at 15–30 °C; injection pressure is set between 90 MPa and 140 MPa, with holding pressure at 60–80 MPa for 0.5–0.8 s after switchover. On a 2,000–3,500 kN high-speed injection moulding machine with a 24- to 48-cavity hot-runner tool, the fill-to-pack switchover is clamped at 95–97 % of total stroke to reduce jetting, sink marks, and warpage in tamper-evident dairy lids. Elevated ambient humidity above 60 % changes the processing boundary: hopper pre-drying at 70–80 °C for 0.5–1.0 h is introduced because surface moisture can generate splay and poor weld-line strength in high-speed filling.
| Requirement | Standard designation | Reference value |
|---|---|---|
| Melt mass-flow rate | ASTM D1238 at 190 °C/2.16 kg | 50 g/10 min |
| Nominal solid density | ASTM D1505 | 0.956 g/cm³ |
| US food-contact resin | 21 CFR 177.1520(c) 3.1a/3.2a | Direct-contact aqueous and acidic foods |
| EU food-contact overall migration | (EC) No 10/2011 | ≤10 mg/dm² |
| China food-contact resin | GB 4806.6-2016 | Polyolefin resin positive list |
The resin fraction in the final formulation is 97.0–99.5 wt%, with antioxidant and acid scavenger masterbatch at 0.05–0.15 wt% and white mineral-oil based colour masterbatch at 0.5–2.0 wt%; slip agents are omitted for dairy because surface lubricant can interfere with foil heat-seal adhesion and organoleptic neutrality. The downstream process uses sequential valve gates, cooling time of 3.5–6.0 s depending on ambient relative humidity, and stripper-plate ejection to avoid pin marks on food-contact surfaces. Terminal products are single-serve yogurt cups, margarine tubs, deli containers, and thin-wall injection-moulded lids with heat-seal flanges.
Closure production with Braskem HDPE GF4950 is dominated by two competing demands: the 50 g/10 min melt flow enables short filling times in multi-cavity tools, but the narrow molecular weight distribution reduces resistance to environmental stress cracking when the closure is exposed to fatty or surfactant-bearing contents. To compensate, converters blend 2–10 wt% of LLDPE or LDPE with the GF4950 base resin; the base fraction is 90–98 wt%, while erucamide slip agent is added at 0.05–0.2 wt% to reduce cap removal torque. Standards invoked for closure validation include ASTM D1693-15 condition A and B for environmental stress crack resistance, ASTM D638-14 for tensile yield, ASTM D256-10 for notched Izod impact, and ISO 1133-1:2022 for melt mass-flow rate. Product-specific child-resistant closure performance is evaluated by ISO 8317 and tamper-evident band breakage by ASTM D3475. In a 32-cavity hot-runner tool, the melt is processed at 210–240 °C, mould temperature 10–15 °C, injection pressure 100–130 MPa, holding pressure 50–70 MPa for 1.0–1.5 s, and total cycle time 5.5–7.5 s. The downstream forming process uses a reciprocating screw with L/D 20–25 and compression ratio of 2.8–3.2; valve-gated hot drops with tip diameters of 0.6–1.0 mm prevent gate strings. Terminal product types include beverage closures, dairy caps, personal care flip-top caps, and tamper-evident overcaps for tea and juice bottles. Published data for closure torque retention at slip loadings above 0.2 wt% is limited; converters must validate torque-angle signatures on each cap design because torque retention is governed by thread geometry, liner type, and storage environment rather than by resin viscosity alone.
Industrial container moulding with Braskem HDPE GF4950 differs from thin-wall packaging because it introduces thicker sections of 2.0–4.5 mm, longer flow lengths up to 450 mm, and recycled-content tolerances. For open-head pails and stacking crates, the base resin is loaded at 70–100 wt% depending on post-consumer recycled incorporation; post-consumer HDPE regrind is blended at 0–30 wt%, UV stabiliser masterbatch added at 0.1–0.4 wt% for outdoor service, and carbon black concentrate at 1.5–2.5 wt% for UV opacity. Processing occurs on accumulator-assisted injection moulding machines of 8,000–12,000 kN clamp force with shot capacities exceeding 5,000 cm³. Melt temperature is held between 200 °C and 230 °C, mould temperature at 20–35 °C, and injection speed is profiled from slow to fast in the first 30–50 % of flow path to avoid air entrapment at gate transitions. Mechanical validation uses ASTM D638-14 tensile yield, ASTM D790-17 flexural modulus, ASTM D256-10 notched Izod impact, and ASTM D1693-15 condition B for environmental stress crack resistance; hazardous-material pails require UN certification under applicable transport regulations for dangerous goods packaging where specified. Terminal product types include 20 L and 25 L pails for paint, adhesive, and chemical concentrates, as well as ventilated side-wall crates and collapsible logistics containers.
Across multi-cavity houseware tools, Braskem HDPE GF4950 permits filling of 0.9–1.2 mm wall sections in storage drawers without increasing clamp tonnage. The formulation for opaque storage articles is 93.0–99.0 wt% GF4950, 1.0–4.0 wt% colour masterbatch, and 0.1–0.5 wt% antistatic additive where dust pickup is a customer specification. Moulding is performed on 3,500–6,000 kN hydraulic toggle machines with direct sprue or cold-runner multi-cavity layouts; melt temperature is 220–260 °C, back pressure 0.5–1.0 MPa, screw speed 60–100 min⁻¹, and cooling time is set to 6–12 s for 1.0 mm nominal wall. The relevant standards are ASTM D638-14 for tensile, ASTM D790-17 for flexural modulus, ASTM D256-10 for impact, and 21 CFR 177.1520(c) when the article is marketed for direct food contact. Terminal products include storage boxes, drawer organisers, laundry baskets, and clothes hangers.
Personal care and cosmetic packaging tools operate under stricter surface-quality requirements than industrial containers because jetting, weld lines, and gate blush are reject causes on high-gloss jar surfaces. Braskem HDPE GF4950 is processed neat at 96.0–99.5 wt% with colour masterbatch at 0.5–3.0 wt% and optionally 0.05–0.3 wt% erucamide slip concentrate; the slip agent is added only when the closure is paired with a glass jar and torque control is required. The melt is injected at 220–250 °C into fully hardened nickel-polytetrafluoroethylene coated moulds held at 25–35 °C, with injection pressure at 80–120 MPa, hold pressure at 55–70 MPa, and hold time 1.5–2.5 s. Polished mirror cavities with draft angles of 1.0–1.5° are used to maintain release without visible ejection marks. Compliance is governed by EU Regulation (EC) No 1223/2009 for safety of the packaged cosmetic product, REACH Annex XVII for restricted substances, and FDA 21 CFR 177.1520(c) for US distribution where product contact occurs. Terminal components are thick-walled cream jars, caps, overcaps, and airless pump collars.
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Braskem HDPE GF4950 is a high-molecular-weight high-density polyethylene copolymer supplied for extrusion blow molding of rigid packaging. The grade is identified by a nominal density of 0.949 g/cm3 when tested to ASTM D792 and a high-load melt flow rate of 5.0 g/10 min under a 190 °C / 21.6 kg condition according to ASTM D1238. The conventional 2.16 kg melt flow rate is below 0.1 g/10 min, which places the product in the high-molecular-weight HDPE class rather than in injection-molding or thin-wall flow categories. The reduced density relative to homopolymer HDPE is achieved through incorporation of an alpha-olefin comonomer, and the short-chain branches interrupt crystallite growth while increasing the number of tie molecules connecting adjacent lamellae.
Under extrusion shear, the molecular architecture of GF4950 produces pronounced shear thinning across the die shear-rate window from 10 s-1 to 1000 s-1. This response raises low-shear viscosity, supports parison hang time, and permits wall-thickness stability in large containers. The same high melt strength requires attention to die-lip shear stress. Die land length and exit radius must be configured to keep wall shear stress below the critical value for sharkskin; on accumulator heads, die gaps are commonly set between 0.8 mm and 1.8 mm for containers with net volume from 5 L to 30 L. Narrower gaps raise shear stress and may produce melt fracture, while wider gaps reduce orientation and can increase sag.
On single-station shuttle blow molders with 80 mm barrier screws and 24:1 L/D ratios, initial process settings for GF4950 are typically established as follows: barrel feed zone 170–180 °C, compression zone 180–190 °C, metering zone 190–200 °C, head and die zones 190–210 °C. Mold temperature is controlled between 10 °C and 20 °C using chilled water to freeze part surfaces and reduce cycle time. Head pressure commonly reaches 15–25 MPa at screw speeds of 40–60 rpm, and adapter pressure drop must be monitored against the barrel safety limit. At a blow pressure of 0.7–0.9 MPa, the mold opening force is 0.07–0.09 kN/cm² of projected area. For flat-sided containers, blow-up ratios from 2.0:1 to 3.0:1 are used; above 3.0:1, edge thinning on large panels becomes difficult to control without increasing parison thickness locally.
Accumulator processing of GF4950 permits longer parison hang times than medium-molecular-weight HDPE blow grades. Parison programming must compensate for the material’s broader swell and delayed sag. When a 5 L to 20 L jerrycan is blown, the upper sections typically require a larger die gap opening than the pinch-off area, and a minimum wall thickness of 0.6 mm should be retained at corners to avoid stress concentration. Mold cooling channels should be sized to maintain a Reynolds number above 10,000 in turbulent flow for consistent heat removal; poor cooling distribution increases warpage on panels with wall thickness variation.
The environmental stress crack resistance of GF4950 is characterized by ASTM D1693 Condition B at 50 °C; supplier technical literature commonly lists a notched F50 value above 600 h. This position makes the grade suitable for agricultural chemical bottles, detergent containers, and intermediate bulk container liners where aliphatic hydrocarbons, alcohols, dilute acids, or formulated cleaning agents are packaged. At 23 °C, the notched Izod impact strength determined to ISO 180/1A is approximately 8.0 kJ/m². Tensile yield stress is approximately 27 MPa per ASTM D638, and flexural modulus at 1 % secant is approximately 1200 MPa per ASTM D790. These values indicate that stiffness is deliberately lower than that of a 0.957 g/cm3 homopolymer HDPE, while crack initiation time under stress is substantially longer. The product is not recommended for strong oxidizing acids, halogenated solvents, or long-term immersion in high-aromatic gasoline above 40 °C. Specific chemical compatibility must be confirmed by immersion testing under actual service stress and temperature.
| Property | Typical value | Test method |
|---|---|---|
| Density | 0.949 g/cm3 | ASTM D792 |
| High-load melt flow rate | 5.0 g/10 min at 190 °C / 21.6 kg | ASTM D1238 |
| Tensile yield stress | 27 MPa | ASTM D638 |
| Elongation at break | > 800 % | ASTM D638 |
| Flexural modulus, 1 % secant | 1200 MPa | ASTM D790 |
| Notched Izod impact, 23 °C | 8.0 kJ/m² | ISO 180/1A |
| ESCR F50, Condition B | > 600 h | ASTM D1693 |
| Vicat softening temperature | 126 °C | ASTM D1525 |
| Brittleness temperature | < -75 °C | ASTM D746 |
Because the density is held below 0.950 g/cm3, top-load strength is lower than that of a 0.956 g/cm3 homopolymer HDPE container of the same wall weight. In column crush testing to ASTM D2659, the difference can reach 10–15 %. The design response is to increase wall thickness by 0.1–0.2 mm or add reinforcing ribs rather than switch to a higher-density resin when chemical compatibility is the primary requirement. This trade-off is a central difference between high-ESCR blow molding copolymers and high-stiffness homopolymer grades.
For converters comparing GF4950 with a medium-molecular-weight HDPE blow molding grade, the first measurable difference is extruder back pressure. Screw torque on 60 mm grooved-feed extruders can exceed 80 % of motor rating if the feed throat is not cooled, and start-up purge times are longer because melting is slower. Once the line reaches steady state, GF4950 permits larger parison diameters and longer hang times, but cycle time may increase because the part must cool to a lower demolding temperature to prevent pinch-off deformation. Compared with high-flow injection HDPE, the 2.16 kg melt flow rate of GF4950 is lower by at least two orders of magnitude. Injection molding is therefore impractical beyond very thick plaques, and injection pressure would exceed the typical 140 MPa machine limit before complete cavity filling. Compared with film-grade HDPE, GF4950 exhibits excessive melt strength and is unsuitable for blown film processing above a blow-up ratio of 3:1 without blending with low-density polyethylene.
| Resin category | Melt flow indicator | Density | Processing consequence |
|---|---|---|---|
| GF4950 HMW blow molding | HLMFR 5.0 g/10 min at 21.6 kg | 0.949 g/cm3 | High ESCR and melt strength; longer hang time |
| Medium-molecular-weight HDPE blow | HLMFR 12–25 g/10 min | 0.952–0.955 g/cm3 | Shorter parison hang time; lower ESCR under ASTM D1693 |
| High-flow injection HDPE | MFR 20–60 g/10 min at 2.16 kg | 0.955–0.965 g/cm3 | High stiffness; unsuitable for blow molding |
When the material is used for food-contact packaging, regulatory status derives from FDA 21 CFR 177.1520 for olefin polymers. Users should confirm the supplier’s lot-specific statement and the migration limits applicable to the intended food type and hot-fill temperature. In the European Union, the base resin falls under Regulation (EU) No 10/2011; finished-container migration testing is required to establish compliance. For industrial applications, REACH registration covers the polymer, and the SDS should be checked for SVHC content above 0.1 % w/w. Storage of pellets in outdoor silos can raise surface moisture through condensation when pellet temperature is more than 5 °C below ambient dew point. Unlike hygroscopic resins, HDPE does not require desiccant drying, but surface water must be removed by heated hopper air at 70–80 °C for 20–30 minutes or by residence in a conditioned feed bin. Purging between materials should use LDPE or a high-viscosity HDPE purge; halogenated purge compounds are not recommended because residual acid can attack screw and die surfaces.
