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Blowing Agent Masterbatches

Solving challenges in cost and weight reduction for a variety of polymer applications from injection moulding to extrusion.

Delivering controlled, uniform cell structures

In an ever-demanding world where there are increasing pressures on cost reduction, component weight saving and improving production rates. These challenges can in certain applications be met by incorporating a blowing agent.

Blowing agents can allow the polymer processor to achieve weight reduction and use less raw materials by introducing a finely controlled cell structure within the polymer.

With the endothermic blowing agents, as part of their functionality, they will absorb heat energy from their surroundings. This, in injection moulding, lends itself ideally to reducing in mould cooling times and gives the processor the ability to dramatically reduce mould cycle times.

How it works.

Wells blowing agent masterbatches contain specialist active ingredients that are designed to decompose at a specific given temperature, evolving gases such as nitrogen (N2) or carbon dioxide (CO2). The evolved gases will impart a cellular structure to the polymer, making the finished part lighter in weight and also using less polymer to fill the mould volume. Total conversion of the additive to gas within the user’s process is critical for ensuring that the maximum cost reduction benefit is achieved.

Blowing agents are widely used to achieve weight reduction and polymer saving in injection moulding e.g. automotive parts, plastic pallets and crates. Blowing agents may also be used to produce foamed insulation materials and to reduce sink marks in moulding applications.

Wells blowing agents are designed to deliver controlled, uniform cell structures, providing the processor with batch-to-batch reproducibility. Both endothermic and exothermic blowing agent masterbatches are available from Wells Plastics.

Wells blowing agent masterbatches can be custom formulated to suit specific applications or polymer types.

Applications:  Sheet extrusion, Profile Extrusion, Injection moulding, Foam Production

Polymer Carriers Available: PE, Universal

Talk to us about blowing agents.

Need to solve challenges in cost and weight reduction of polymers? Speak to us today about 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