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Processing Aid Masterbatches

Improving the processability and aesthetic properties of extruded films, sheets and mouldings, both fluoropolymer and PFAS free options available.

Improving melt processability and aesthetics of polymers.

Polymer processing aids are designed to improve the melt processability and handling of high molecular weight polymers. They can also give finished articles improved aesthetic properties by removing flow marks and die lines thereby improving the parts gloss and clarity.

Processing aids find use in a wide variety of applications from blown film to fibre, profile extrusion, pipe/tubing and cabling processes. They can be used with many polymers including LDPE, LLDPE, HDPE, mLLDPE, PP, polystyrene, ABS and others.

How it works.

Wells processing aid masterbatches are based on a variety of technologies depending on the requirements of the end application and regulatory constraints.

Technologies used include both high performance fluoropolymer and innovative PFAS free systems.

Polymer process aids masterbatches are designed to provide a dynamic low friction surface coating on the extruder screw, barrel, and die which enables the polymer melt to pass through with less resistance. This ease of flow helps to reduce pressure and motor torque within the extruder giving the processor scope for energy savings.

In addition to potential cost savings polymer processing aids also improve the aesthetic appearance of the product and can extend up time.

In blown and cast film extrusion, processing aids are predominantly used to reduce melt fracture (sharkskin) and die lines, and to promote reduced gel formation and cleaner running. This enables the processor to run longer between stops for dies cleaning.

In sheet and profile extrusion, and in extrusion blow moulding, the processing aids main functions are for low die build up, removal of die lines, and for faster colour change over times.


Wells processing aid masterbatches are very effective, even when used at very low addition rates.

Applications: Blown Film, Cast Film, Sheet Extrusion, Profile Extrusion, Nonwovens and fibre

Polymer Carriers Available: PE, PP, PS

Talk to us about processing aids.

Want to know how our processing aid technologies can help you in your polymer processing? Speak to us today for more information on how we can help


Antimicrobial Masterbatches and powders for polymer applications


Biodegradable Additive Masterbatches for polymer films


Here you can access our policies, regulatory documents and certificates

Wells Plastics Founded

The business was founded in 1984 by Danny Wells servicing the UK with specialist additive masterbatches for the UK film and fibre marketplace, with a particular expertise in UV masterbatches.

New Management

In 1997 Danny left the business, under new management the product range began to grow.

Bactiglas™ Launches

In 1999 the business entered antimicrobial masterbatch marketplace which would become the Bactiglas™ range of products.

Reverte™ Arrives

In 2003 Wells developed a range of oxo-biodegradable masterbatches which would become the Reverte™ range of products in 2005.


In 2006 the business began its first site expansion taking on more warehousing and office space on the same industrial estate, including an expansion of the lab facility to support the growing business.

Growing Team

In 2009 the

Technical Department expanded further

Management Buy Out

In 2011 KCP supported a management buy-out and provided investment for growth

International Growth

In 2012 Wells increased dramatically its international foot print through an expanded distribution network.

Founding Members

In 2015 Wells are the founding Member of the oxo-biodegradable plastics federation (now known as the Society of Biodegradable Polymers)

Capacity Increases

In 2018 the business underwent a significant capacity uplift with a 40% expansion and extension of the current production facility

ISO 14001

In 2019 the business achieved ISO 14001


Ecovadis Silver

In 2020 Wells achieve a Silver EcoVadis rating

A Busy Year

In 2022 Wells created the Innovation Centre, a raw material warehouse, gained a Gold Ecovadis rating and completed a Management Buy Out

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Our products

A wide range of masterbatches for film and sheet applications

Marketed under the Bactiglas™ trademark masterbatches and powders food packing through to medical devices.

A wide range of masterbatches for film, sheet and injection moulding applications

Wells offer a bespoke additive masterbatch and compounding service

Exothermic and endothermic masterbatches and powders for extrusion and injection moulding processes.

A range of biopolymer and biobased materials for extrusion and injection moulding applications.

Wells additive masterbatch and compound contract manufacturing services

Moisture absorbing masterbatches for all extrusion and injection moulding processes

A wide range of bespoke flame retardant masterbatch and compound solutions.

Masterbatches to enhance point of sale items with fragrances or eliminate unwanted mal-odours from recycled feedstocks

A range of masterbatches sold under the Reverte™ trademark for providing a biodegradable property to polyolefins

Masterbatches to improve the quality and aesthetics of extruded polymer, reducing waste and energy consumption.

A range of compounds to aid in the purging, cleaning and shut down procedures of extrusion equipment.

Masterbatches and compounds which provide an enhanced and controlled slip property to extruded and injection moulded articles.

Masterbatches to enhance stability polymers during processing, in use and during recycling suitable for a wide range of applications and processes

Masterbatches to enhance the UV stability of polymers during suitable for a wide range of applications and processes