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Antiblocking Masterbatches

When used with a polymer our antiblocking masterbatches will reduce blocking tendency allowing films or sheets to be easily separated. 

Reducing blocking tendency.

Blocking is an undesirable attraction between adjacent layers of film or sheet, often making it difficult to the separate individual layers. Certain polymers including, polyolefins and polyesters have an inherent tendency to block.

Blocking can occur during extrusion, conversion processes or during storage. Blocking can reduce packing efficiencies on automated and manual packing lines as it causes for example bags to be more difficult to open and stacks of thermoformed trays harder to separate.

The introduction of an antiblocking agent into a polymer will reduce the blocking tendency allowing films or sheets to be easily separated. The antiblocking agent will create a microscopic roughening of the film or sheet surface which reduces the available contact area between adjacent layers.

How it works.

Many different materials can be used to give an antiblocking effect. The choice of antiblock depends upon the polymer being used and the quality requirements of the end product. For example, if a product requires high clarity, it is important to choose an antiblocking agent with a refractive index as close as possible to that of the polymer.

Wells has developed a range of antiblocking masterbatches using finely selected raw materials which have been successfully used to:

  • – Improve winding / unwinding quality in reeled materials.
  • – Produce easy opening packaging.
  • – Improve the denesting of thermoformed articles.
  • Antiblocks are non-migratory additives and therefore, in coextruded structures, need to be present in the outer layers.

Wells antiblocking masterbatches can be custom formulated to suit specific applications or polymer types. Combination masterbatches with slip are also available.

Applications:  Blown Film, Cast Film,  BOPP

Polymer Carriers Available: PE, PP,  PET

Talk to us about antiblocking.

Interested in antiblocking masterbatches for your polymer product? Speak to us today for more information. 


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