A Practical Guide to Heavy Duty Polyethylene Bags, Pinch Bottom Open Mouth, Tubular FFS Film Bags, and PE Valve Bags
Industrial packaging has to do much more than hold a product. It has to survive filling, absorb handling shock, control dust and moisture, move smoothly through packing equipment, stack with confidence, protect the printed brand, and reach the destination in a condition that is ready for use. For dry powders, granules, fertilizers, polymer resins, minerals, food ingredients, building materials, and chemical products, the package is therefore part of the production system rather than a simple container. This is the design logic behind VIDEPAK’s Heavy Duty Polyethylene Bags.
VIDEPAK builds this polyethylene packaging platform around advanced co-extrusion, purpose-designed Multi-layer film structures, flexible bag geometry, controlled sealing, surface treatment, air-release options, and high-quality printing. The same engineering platform can be configured into open-mouth formats, Pinch Bottom Open Mouth constructions, continuous Tubular FFS Film Bags, and PE Valve Bags. The style changes, but the objective stays the same: make the package work reliably from the filling point to the final pallet. VIDEPAK’s current published polyethylene range lists widths of approximately 35–65 cm, film thicknesses of approximately 0.10–0.25 mm, customizable length, FFS roll diameters of 100–150 cm, printing up to 10 colors, flat or M-gusseted sides, micro-perforation, embossing strips, air-valve options, heat-seal construction, and up to nine-layer polyethylene structures.
Packaging principle: do not specify an industrial bag by thickness alone. A successful package balances film strength, sealability, air release, friction, dimensions, filling behavior, and pallet geometry. A well-engineered Multi-layer structure using controlled co-extrusion can often create more useful performance than simply adding material without changing the design.
The VIDEPAK Heavy-Duty PE Packaging Platform at a Glance
The strength of VIDEPAK’s polyethylene portfolio is not one isolated bag style. It is the ability to begin with a common film-engineering platform and then adjust that platform around the customer’s product, filling equipment, target pack weight, transport route, storage environment, and pallet requirements. This approach is particularly important for Heavy Duty Polyethylene Bags, because two bags with the same width and nominal thickness can perform very differently when their resin architecture, seal layer, vent pattern, surface friction, or gusset geometry changes. VIDEPAK therefore treats co-extrusion, Multi-layer structure, bag construction, and functional options as connected parts of one specification.
VIDEPAK positions this polyethylene range for heavy-duty packs from 5 kg upward and reports large-scale production of polyethylene industrial packaging. More important for a buyer, however, is repeatability. When industrial bags are used in large volumes, small variations in width, film gauge, seal behavior, roll winding, friction, or print position can become production losses. Consistent Heavy Duty Polyethylene Bags are therefore created by controlling the whole production sequence, not by inspecting appearance alone.
Strength Where It Is Needed
Multi-layer film architecture can distribute different performance functions through the bag wall instead of forcing one resin blend to perform every task.
Air Where It Must Escape
Micro-perforations or dedicated air-release features can be calibrated for products that trap air during filling, helping the finished package settle toward its intended shape.
Grip Where the Pallet Needs It
Localized embossing can increase bag-to-bag grip without making every part of the film rough, supporting more controlled pallet behavior.
Heavy Duty Polyethylene Bags: Strength Starts Inside the Film
Heavy Duty Polyethylene Bags are industrial sacks made from substantially heavier and stronger polyethylene film than everyday consumer bags. VIDEPAK’s current product information describes heavy-duty PE packaging made from high-performance polyethylene through advanced Multi-layer co-extrusion blown-film technology. The reason for this construction is practical: the package may need flexibility during impact, stiffness on the filling line, resistance to puncture from hard granules, reliable heat sealing, moisture protection, controlled friction, and a clean printable surface at the same time. A single film property cannot solve all of those demands.
This is where Heavy Duty Polyethylene Bags differ from a specification based only on gauge. Thickness is important, but thickness is only one variable. The outer surface may need to tolerate warehouse rubbing and hold print; the center of the film may need to provide body and mechanical support; the inner surface may need predictable thermal sealing. Additives for slip, anti-blocking, processing, and surface behavior can also be positioned with greater control when co-extrusion is used. The result is not several loose films laminated together after production. The molten layers are formed together into an integrated film structure.
How Multi-layer co-extrusion Creates a Smarter Bag Wall
In simple terms, co-extrusion allows several polymer melt streams to become one film at the extrusion die. A basic design principle can be expressed as: outside for handling and printing, middle for mechanical balance, inside for sealing. More advanced Multi-layer structures can divide those functions further. VIDEPAK states that its polyethylene platform can be configured with up to nine layers, which gives packaging engineers room to adjust stiffness, toughness, sealing behavior, and surface characteristics for specific products and packing lines.
The value of Multi-layer is balance.
Flexible, yet controlled. Tough, yet sealable. Smooth enough to run, yet stable enough to stack. A good co-extrusion recipe does not add layers merely to increase a number on a specification sheet; each layer should solve a defined packaging problem. VIDEPAK’s own technical guidance emphasizes that more layers are useful only when layer functions are matched to the application.
For engineers and procurement teams, measurable performance is more useful than broad words such as “strong” or “durable.” ASTM D882 covers tensile testing of thin plastic film, ASTM D1709 evaluates impact resistance using a free-falling dart method, and ASTM F88/F88M measures flexible-package seal strength. These methods provide a framework for checking film and seal behavior, although laboratory results should still be combined with filling-line trials, drop testing, pallet evaluation, and transport simulation for the intended application.
The practical value becomes clear in real industrial conditions. A sharp or irregular granule may place concentrated stress on a small part of the bag wall. A dense powder may create high impact when a filled bag leaves the packer. A light powder may trap large volumes of air and turn an otherwise strong package into a soft “pillow.” A moisture-sensitive product may need tight seals and a carefully limited perforation strategy. For these reasons, VIDEPAK designs Heavy Duty Polyethylene Bags around product behavior rather than selecting a universal film recipe. Same weight, different product; same dimensions, different risk; same bag family, different engineering.
Surface engineering is part of this same system. VIDEPAK lists embossing strips and micro-perforations among the available features of its Heavy Duty Polyethylene Bags. Embossing is primarily about controlled grip between filled bags. Micro-perforation is primarily about controlled air release. They solve different problems, and their placement matters. Too little venting may leave a powder-filled sack swollen; too much venting can unnecessarily reduce the film’s barrier function or allow fine product to escape. The correct design is therefore a calibrated compromise between filling speed, dust control, package shape, and product protection.
For customers considering sustainability targets, an all-PE structure can also support design-for-recycling strategies when the complete package is compatible with the relevant polyethylene flexible-film collection and recycling system. Current plastic recycling design guidance evaluates not only the base polymer but also printing, additives, labels, coatings, and other components, so recyclability should be treated as a complete-package design question rather than an automatic claim based only on the word “polyethylene.”
Pinch Bottom Open Mouth: Wide Filling Access with a Controlled Bottom
Pinch Bottom Open Mouth describes a bag construction that combines an open filling mouth with a pre-formed, securely closed bottom. In the general Pinch Bottom Open Mouth principle, the bottom is completed by the bag manufacturer before shipment. At the packing plant, product enters through the open top; after the target weight is reached, the customer closes the top using the closing system specified for the package. For polyethylene constructions, the film structure and thermal closure must be matched to the actual sealing equipment and operating window.
The attraction of Pinch Bottom Open Mouth is easy to understand. The filling opening is broad, which gives the line direct access to the bag. The finished bottom is already controlled. After filling, the top can be closed into a neat package with clean front and back panels. For products where presentation, sift control, and compact package geometry matter together, Pinch Bottom Open Mouth offers a useful bridge between the flexibility of open-mouth filling and the discipline of a prepared bottom construction.
When a Pinch Bottom Open Mouth format is produced from a Multi-layer polyethylene film, the bag wall can be designed around the same co-extrusion logic used across VIDEPAK’s Heavy Duty Polyethylene Bags. The outer portion of the film can support handling and print quality, internal layers can carry mechanical functions, and the inside can support the intended heat-sealing behavior. The value is not just a neat fold. The value is the combination of bag geometry and material architecture.
Choosing Pinch Bottom Open Mouth should still begin with the product and filling line. Bulk density affects the required bag volume. Particle size affects puncture and sifting risks. Air entrainment affects the need for venting. Pallet dimensions affect width, gusset, and filled height. Seal equipment determines the practical closing window. The best Pinch Bottom Open Mouth package is therefore not simply a bag with a folded bottom; it is a coordinated combination of bottom design, Multi-layer film, co-extrusion recipe, dimensions, and closing behavior.
Where Pinch Bottom Open Mouth makes sense: consider this construction when open-mouth filling is preferred but the package also needs a prepared bottom, controlled final appearance, strong film-based protection, and a top closure engineered for the customer’s sealing system.
Tubular FFS Film Bags: Packaging Built Around Continuous Automation
Tubular FFS Film Bags bring the same heavy-duty polyethylene engineering into a different operating model. Instead of delivering every sack as a separate pre-made bag, tubular FFS material is supplied as a continuous polyethylene tube on a roll. The FFS machine draws the tube from the reel, creates a bottom seal, fills the product, makes the next seal, and separates the finished package. In other words, the bag is formed, filled, and sealed as part of one continuous packing process. VIDEPAK describes its FFS tubular polyethylene films as products made from HDPE and LDPE Multi-layer co-extrusion structures for high-speed automated filling.
This distinction matters when discussing Tubular FFS Film Bags. Technically, the manufacturer supplies tubular rollstock; the customer’s FFS equipment converts that rollstock into individual filled sacks. That format can reduce the handling of separate empty bags and integrate forming, filling, and sealing into a single production sequence. The exact productivity gain depends on the customer’s machine, product, roll change procedure, seal settings, and factory layout, so FFS performance should always be validated on the intended line.
The film itself must do several jobs with very little drama. It must unwind consistently. It must stay aligned. It must form clean seals at production speed. It must accept the intended printing and registration system. It must withstand filling impact. It must release trapped air when the product demands it. It must then become stable enough for conveyors, palletizers, stretch wrapping, storage, and transport. This is why Tubular FFS Film Bags and Multi-layer co-extrusion are such a natural combination: different functions can be engineered into one continuous film wall before the roll ever reaches the filling plant.
VIDEPAK’s published FFS range lists widths of approximately 35–65 cm, thicknesses of approximately 0.10–0.25 mm, roll diameters of 100–150 cm, customized length according to the FFS process, and printing up to 10 colors. Flat or M-gusseted structures, embossing strips, micro-perforation, and air-release options can be selected according to the project. These figures should be treated as a practical design window rather than a universal specification, because the correct Tubular FFS Film Bags configuration depends on the filler, packed product, net weight, speed, sealing conditions, and pallet requirements.
From Polyethylene Resin to Finished Tubular FFS Film Bags
Match toughness, stiffness, processing, and sealing needs.
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Build an integrated tubular film with defined layer functions.
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Prepare the film for identification, graphics, and line requirements.
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Add mapped micro-perforation and/or anti-slip embossing where required.
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Produce continuous tubular rollstock for the customer’s FFS line.
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The packing line converts the tube into individual Tubular FFS Film Bags.
The airflow question deserves special attention. Powders and some low-density products can carry substantial air into the package during fast filling. If that air cannot escape quickly enough, Tubular FFS Film Bags may leave the sealing area rounded and soft instead of compact. Carefully mapped micro-perforations are one way to release the trapped air. The engineering challenge is to release enough air for the line while avoiding unnecessary product sifting and minimizing the reduction of moisture protection. More holes are not automatically better; neither are fewer holes. Venting is a product-and-process specification.
Friction also has two sides. During conversion and filling, the film must move predictably through the machine. After filling, the resulting Tubular FFS Film Bags should resist unwanted movement on the pallet. VIDEPAK therefore offers localized embossing treatment as a way to add mechanical grip at selected contact areas while maintaining other areas for printing, sealing, and machine interaction. Smooth where movement is needed; grip where stability is needed. That contrast is a small detail with a large operational purpose.
The best use case for Tubular FFS Film Bags: a plant that wants a continuous polyethylene roll engineered around automated forming, filling, and sealing, especially where line integration, controlled sealing, repeatable film dimensions, customized venting, and strong industrial handling are priorities.
PE Valve Bags: Controlled Filling, Air Management, and Pallet-Ready Shape
PE Valve Bags solve the filling problem in a different way. Instead of opening the full top of the sack, the bag receives product through a smaller valve sleeve, normally positioned near a top corner. The valve interfaces with the filling spout; after the target weight is reached, the sleeve can flatten or close according to its design, with additional thermal or other compatible sealing used when the required protection level calls for it. This makes PE Valve Bags particularly relevant to automated and semi-automated filling of powders and granules.
VIDEPAK combines this valve interface with heavy-duty polyethylene construction. Its published PE Valve Bags platform includes approximately 35–65 cm width, approximately 0.10–0.25 mm film thickness, customized length, flat or M-gusseted sides, welded block-bottom construction, optional embossing strips, engineered micro-perforations, heat sealing, up to 10-color printing, and Multi-layer co-extrusion of up to nine layers. Once again, the numbers define an engineering window; the final package should be selected around the actual material, spout, line, fill speed, air load, transport environment, and pallet plan.
The valve itself is only one part of successful PE Valve Bags. Fast powder filling can carry air into the package. Without enough de-aeration, that air can make the filled bag swell, delay settling, and produce a less regular pallet. VIDEPAK therefore treats valve geometry and micro-perforation as connected functions: the valve controls product entry; the perforation pattern controls the exit of entrained air. Meanwhile, the Multi-layer film controls the package wall, and embossing can control local surface grip. Four controls, one bag.
Block-bottom geometry can further support the finished shape of PE Valve Bags. A broader, more defined base helps the filled sack develop a rectangular footprint rather than behaving like a loose pillow, which can be useful when pallet regularity and automatic end-of-line handling are important. Gussets can add expansion volume and influence the cross-section of the filled bag. Neither feature should be chosen alone: bag width, gusset depth, product bulk density, filling level, valve position, and de-aeration must work together. A square bottom cannot correct excessive trapped air, just as excellent venting cannot correct dimensions that do not fit the product volume.
Matching Heavy Duty Polyethylene Bags to the Product, Line, and Route
The selection process should begin with product behavior, not with the bag name. A 25 kg mineral and a 25 kg polymer granule may have equal net weight but completely different bulk volume, puncture risk, air entrainment, and moisture sensitivity. A fine powder may make venting the first design question. A sharp granule may put greater emphasis on toughness and impact performance. A slippery pallet may push embossing higher on the priority list. A high-speed FFS line may make roll quality and sealing behavior critical. The correct Heavy Duty Polyethylene Bags specification is therefore the one that converts these operating facts into film architecture and package geometry.
For PE Valve Bags, buyers should provide the filling-spout dimensions, target filling rate, bulk density, particle form, moisture sensitivity, product temperature, required bag weight, desired pallet configuration, stack height, printing requirements, storage conditions, and known problems with the current package. For Tubular FFS Film Bags, roll dimensions, machine requirements, registration controls, sealing settings, and required surface friction become equally important. For Pinch Bottom Open Mouth, the final top-closing equipment and sealing conditions need particular attention. These details allow the Multi-layer structure and co-extrusion recipe to be designed around the operation rather than around assumptions.
A useful RFQ starts with the packing process.
Product form + net weight + bulk density + fill temperature + filling machine + target speed + bag dimensions + sealing method + air-release requirement + pallet pattern + transport conditions = a much stronger starting point for specifying Heavy Duty Polyethylene Bags, Pinch Bottom Open Mouth, Tubular FFS Film Bags, or PE Valve Bags.
Quality validation should then connect material data with real packaging performance. Film tensile properties can be assessed using methods such as ASTM D882; impact resistance can be evaluated with methods such as ASTM D1709; and seal strength can be measured under ASTM F88/F88M. VIDEPAK’s published quality information also describes testing against internationally recognized standard systems according to product requirements. Yet a laboratory number should not stand alone. The final confirmation is the complete package: film, seal, valve or mouth, venting, filled shape, drop behavior, pallet stability, and compatibility with the customer’s actual filling equipment.
That complete-package view defines the VIDEPAK approach. Heavy Duty Polyethylene Bags provide the broad industrial PE platform. Pinch Bottom Open Mouth combines direct open-mouth filling with a prepared bottom and controlled closing logic. Tubular FFS Film Bags turn continuous polyethylene rollstock into an integral part of automated packaging. PE Valve Bags combine a compact filling interface with engineered air release and stable package geometry. Behind each style, Multi-layer co-extrusion provides the material architecture that allows strength, flexibility, sealing, surface behavior, and processing needs to be balanced within one film.
VIDEPAK product philosophy: not simply thicker, but engineered where strength is needed; not simply more ventilation, but the right airflow; not simply more layers, but purposeful Multi-layer design; not simply a polyethylene bag, but a package matched to filling, sealing, palletizing, storage, and transport. Whether the project calls for Heavy Duty Polyethylene Bags, Pinch Bottom Open Mouth, Tubular FFS Film Bags, or PE Valve Bags, controlled co-extrusion turns polyethylene film into a working part of the customer’s packaging system.
What is the strength of industrial bulk packaging? Moisture protection, and efficiency, heavy-duty PE bags stand out. These high-performance sacks—produced by multi-layer co-extrusion of LDPE/LLDPE/MDPE (and even barrier layers like EVOH or tie-resins)—offer durability, versatility and recyclability that simple poly or paper bags cannot. They come in several formats (open-mouth sacks, valve bags, pinch-bottom bags, etc.) to suit different filling machines and products. Key features include tough multi-layer film (100–300+ μm gauge), optional gussets or embossing for anti-slip stacking, one-way air valves and micro-perforations for venting. In this report, we define heavy-duty PE bag types and specs, compare them to alternatives (paper, woven PP), and introduce VidePak as a leading supplier.
We detail VidePak’s use of top-brand PE resin (from BASF, Sinopec, Yangzi), W&H multi-layer co-extrusion lines, ASTM/ISO-standard testing, in-house film-to-bag production, and ~600 million bag/year capacity. The analysis is supported by tables and diagrams, offering a rigorous, EEAT-compliant overview of heavy-duty PE bags in industry.
- A Practical Guide to Heavy Duty Polyethylene Bags, Pinch Bottom Open Mouth, Tubular FFS Film Bags, and PE Valve Bags
- The VIDEPAK Heavy-Duty PE Packaging Platform at a Glance
- Heavy Duty Polyethylene Bags: Strength Starts Inside the Film
- Pinch Bottom Open Mouth: Wide Filling Access with a Controlled Bottom
- Tubular FFS Film Bags: Packaging Built Around Continuous Automation
- PE Valve Bags: Controlled Filling, Air Management, and Pallet-Ready Shape
- Types of Heavy-Duty PE Bags
Multi-layer Polyethylene Valve Bags
Heavy-duty multi-layer PE valve bags with high strength and sealing for industrial packaging.
Check More →PE Open Mouth Bags
Durable open mouth polyethylene bags designed for heavy-duty industrial and bulk packaging.
Check More →Heavy-Duty PE Bags Roll With Air Valve
Professional heavy-duty PE bag rolls with air valve, ideal for strong and reliable packaging.
Check More →Heavy-Duty HDPE Bags With Venting
High-density heavy-duty polyethylene bags with venting function for durable and safe packaging.
Check More →Types of Heavy-Duty PE Bags
Heavy-duty PE bags are categorized by their filling/closing style. The main types are:
1. Open-Mouth (Flat) PE Sacks
These are flat poly bags (often heat-sealed at the bottom) with a fully open top. They may have gussets (side folds) for extra capacity. Open-mouth sacks are filled manually or on FFS machines, then sealed shut (by sewing, heat/tape). They serve products like fertilizers, salts, feeds, and plastic pellets. The co-extruded film is typically 100–250 μm thick. Their key feature is simplicity: no valve or special opening, just a clean-cut or hemmed top. Typical uses include agricultural chemicals, food grains, or any free-flowing solid where dust control is manageable.
2. PE Valve Bags
These have an integrated filling valve – an internal PE sleeve at the bag corner. The sleeve attaches to a packing spout (air-filler, screw-filler, etc.) and allows rapid, low-dust filling. After filling, the bag’s own weight and pressure help collapse the valve closed; many designs also allow heat- or ultrasonic-sealing the valve for extra tightness. Valve bags usually have a welded block-bottom, which forms a square base (like a box) to support the bag upright. This design carries heavy powders (cement, gypsum, salt) without tipping. The film is heavy gauge (often 160–220 μm, up to 300 μm) and often co-extruded to include layers for stiffness and puncture resistance. Key valve types include tuck-in sleeves, hot-melt adhesive sleeves, or ultrasonic-sealed sleeves. Anti-skid embossing is common on the film. PE valve bags are prized in cement, mineral, and chemical industries for fast filling, dust control, and leak-proof shipping.
3. Pinch-Bottom (PBOM) PE Bags
Also called pinch-bottom open-mouth bags. The bottom is folded and heat-sealed in a pinch (often with pre-applied hot-melt), creating a flat, block-style base. The top remains open for filling. Once filled, the top is closed (usually by sewing or heat-seal). Pinch-bottom bags combine the stability of a flat base with the simplicity of an open mouth. They are used for dry goods like animal feed, flour, and seasonings. These bags can be equipped with liners or coatings for moisture, and retain the same heavy multi-layer PE film. Essentially, a PBOM PE bag behaves like a hybrid of an open-mouth sack and a block-bottom bag. It is ideal when a permanent bottom seal is desired (for display or stability) but top flexibility is needed.
4. Tubular / FFS Film Bags
Some heavy-duty PE bags are formed on-the-fly by a Form-Fill-Seal (FFS) machine from a continuous PE film tube. These can be either open-mouth (cut-off) or have block bottoms welded in-line. FFS bags emphasize efficiency: a roll of co-ex film is unwound, printed, formed into a tube, filled, and sealed automatically. This process produces bags with excellent thickness uniformity and seal integrity. FFS tubular bags can include micro-perfs and embossing as the film is extruded (before sealing).
Reminder: Choosing the right type of PE bag depends on the product’s flow characteristics, dust control needs, and stability requirements. Open-mouth bags are simple and flexible, valve bags are ideal for powders and fast filling, pinch-bottom bags offer stability with simple filling, and FFS bags are best for automated, high-efficiency production.
Table 1: Heavy-Duty PE Bag Types and Characteristics
| Bag Type | Description | Typical Use Cases | Construction Highlights | Closure Type | Film Specs |
| Open-Mouth Sacks | Flat poly sack (bottom sealed) with wide open top | Fertilizer, salts, feeds, plastic pellets | Multilayer PE film (LDPE/LLDPE/MDPE); optional side gussets for volume | Bottom heat- or ultrasonically sealed; top sewn or heat-sealed after filling | ~100–250 μm thick film; widths ~300–800 mm; loads ≈5–25 kg |
| PE Valve Bags | Poly bag with internal filling valve (corner sleeve) and block-bottom base | Cement, minerals, chemicals, powders | Coextruded PE film; welded square bottom for upright stance | Valve auto-closes under load; can be heat- or sonic-sealed | Typical gauge 160–220 μm (custom up to 300 μm); capacity ~20–50 kg |
| Pinch-Bottom (PBOM) | Bottom factory-sealed in a pinch fold, open top for filling | Flour, sugar, feed, retail dry goods | Multilayer PE film; factory hot-melt pinch-fold at bottom | Bottom glued/hot-melt sealed; top heat- or sewn shut | Similar to open-mouth (100–300 μm) film; stable flat base |
| FFS Tubular Bags | Bags formed from continuous PE tube on FFS machine (open or block bottom) | Bulk grains, powders, chemicals on high-speed lines | Produced inline (film extrusion → gusset/emboss → fill → seal) | Automatic continuous sealing on FFS line | Coextruded film, thickness 100–300 μm (as needed) |
For each category, material grades are typically high-performance PE (linear low/high density). Film thickness scales with load (heavier bags use 200+ μm). Bag capacity ranges from ~10 to 50 kg, depending on style. Customization is broad: gussets can be added for volume; high-gloss or reverse printing can be applied; anti-slip embossing increases stack friction; micro-perforation patterns (50–200 μm holes) provide gas venting; and internal liners or barriers (EVOH, PE inner liners) can be included for extra moisture resistance. Closure methods are usually heat-sealing (electric or ultrasonic) – even top flaps are often fused to avoid manual sewing.
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