LyondellBasell Lupolen 3621C: polyethylene workhorse for flexible packaging

Responsible: ad hoc news B2B & Pro Desk. Reviewed prior to publication on June 13, 2026 at 8:42 AM ET. Details in the imprint.

Lupolen 3621C from LyondellBasell is a low-density polyethylene (LDPE) grade widely used in blown film applications for flexible packaging, especially where processors need a balance of optical clarity, toughness, and processability. It is part of the companys long-running Lupolen portfolio, which has been a staple in polyethylene packaging grades for decades across Europe and other regions. As converters in food, consumer goods, and industrial segments look for consistent film quality and stable processing, this grade aims to offer predictable performance on modern high-output extrusion lines.

What Lupolen 3621C is designed to do in packaging lines

Lupolen 3621C is described by LyondellBasell as a general-purpose LDPE film grade suitable for mono- and multilayer films, including applications such as carrier bags, liners, and various flexible packaging films. The material is delivered in pellet form and is processed via blown film extrusion, where stable bubble formation and thickness control are key to minimizing waste and ensuring uniform mechanical properties. For film converters operating at high throughput, that kind of process window can translate to fewer line interruptions and more predictable scrap rates.

According to a LyondellBasell technical data sheet, Lupolen 3621C has a melt flow rate (MFR) of around 0.3 g/10 min at 190 °C/2.16 kg and a density in the range typical for LDPE, which places it in a relatively low MFR range suited for blown film with good melt strength. That melt strength helps to stabilize the bubble during extrusion, which is particularly important for producing thin films with consistent gauge control. The grade is also characterized as having a good balance of impact strength and tear resistance, properties that are relevant for carrier bags and packaging films that must withstand handling and transport.

The resin is typically used for films in thickness ranges commonly found in carrier bags and liners, though specific film thickness recommendations are usually given by converters based on their end-use and line configuration. LyondellBasell notes in its documentation that Lupolen 3621C can be used in blends or multilayer constructions, which allows film producers to combine the resin with other materials, such as linear low-density polyethylene (LLDPE) or metallocene-based grades, to fine-tune film stiffness, sealing performance, and puncture resistance. This flexibility is important for packaging designers who need to balance downgauging efforts with mechanical performance.

The Lupolen family, including 3621C, is used in a wide variety of flexible packaging applications such as shrink films, non-food packaging, and industrial liner films, according to LyondellBasells product literature. For some end uses, such as non-food industrial packaging, converters can focus on mechanical robustness and process efficiency, while in other segments, such as retail carrier bags, optical appearance and printability also play a role. Lupolen 3621C is positioned as a workhorse LDPE that can serve these needs without being overly specialized, which can help converters keep raw material inventories simpler.

From a processing standpoint, LyondellBasell provides guidance for Lupolen 3621C on typical extrusion temperatures and line conditions that align with common LDPE film practice, often spanning barrel temperatures from roughly 160 °C to 200 °C depending on line design and die configuration. While detailed processing windows vary by equipment, such published ranges are meant to give processors a starting point, particularly when switching from another LDPE grade. Having a well-documented processing profile can reduce trial-and-error time during product changeovers.

In the context of broader packaging trends, LDPE grades like Lupolen 3621C continue to play a role where softness, sealability, and toughness are valued, even as the industry gradually explores higher recycled content and alternative structures. Some converters use conventional LDPE grades as part of multilayer films that incorporate recycled materials in core layers, while keeping virgin LDPE on outer layers that demand more stringent optical or surface properties. The use of a stable and predictable virgin LDPE can help offset variability introduced by recycled streams, according to industry best practices discussed by packaging technology providers.

LyondellBasell highlights its polyethylene offerings, including branded series such as Lupolen and Hostalen, as part of a broad polyolefin portfolio that targets packaging, film, injection molding, and other end markets. The company is one of the worlds leading producers of polyolefins, with integrated operations across ethylene crackers and polymerization assets. In this portfolio, Lupolen 3621C represents a classic LDPE film grade aimed at converters who prioritize reliability over niche specialty functionality.

When it comes to regulatory and food-contact aspects, LyondellBasell typically provides statements of compliance and regulatory data sheets for its polyethylene grades, including LDPE materials, to address U.S. and EU food-contact frameworks. Specific use conditions and limitations depend on regional regulations and must be validated by converters and brand owners. For industrial and non-food packaging, the main considerations often shift toward mechanical performance, sealing behavior, and printing compatibility.

For packaging producers serving retailers and industrial customers in North America and Europe, the availability of such documentation can be a practical factor in material selection. Being able to reference existing regulatory clearances and standardized datasheets can speed up qualification, especially when customers require detailed technical files and compliance declarations as part of their vendor approval processes.

From a sustainability perspective, LyondellBasell has been communicating broader goals around circularity, recycling, and lower-carbon solutions, including efforts to develop mechanically recycled and chemically recycled polyolefin products under brands like Circulen. While Lupolen 3621C itself is a conventional fossil-based LDPE grade, it sits within a portfolio that is gradually expanding to include more circular alternatives, and converters may look at these related offerings when designing future packaging structures. For now, workhorse LDPE grades continue to underpin many existing film lines, especially where converters prioritize high run rates and well-understood performance.

LyondellBasell positions its polyolefin grades through regional technical service teams that support customers on processing and application questions. For Lupolen 3621C, that can include guidance on film line setup, troubleshooting of bubble stability or film defects, and recommendations on blending with other resins to achieve specific property profiles. Technical support can be a differentiating factor when converters are considering material switches or aiming to optimize existing lines for higher output.

As part of LyondellBasells long-established polyolefin portfolio, Lupolen 3621C plays a relatively traditional but important role in flexible packaging, particularly in markets where LDPE-based carrier bags, industrial liners, and general-purpose films remain widely used. At the corporate level, polyolefins, including polyethylene and polypropylene, represent a significant share of the companys sales, though LyondellBasell does not usually break out revenue by individual grade. Shares of LyondellBasell (NL0009434992, ticker LYB) last traded around $65 on the New York Stock Exchange in mid-June 2026, according to recent market data.

This article was created with a.i. assistance and editorially reviewed. Product information is provided without warranty; prices and availability may change at any time. Not investment advice, not a buy or sell recommendation. Trading in securities carries risks up to the total loss of capital.