01793 754 457
Mon - Fri | 08.00 - 17.00
Email GWP coatings
Free advice and quotes

The widest range of protective case options from an independent UK supplier.

Market leading ESD safe packaging for any static sensitive products and components.

Huge range of options and impartial advice on genuinely sustainable packaging for your business.

Waterproof Cardboard


Trade service to sheet plants

Low volumes

Coatings from 200 sq. metres


Sheet Plant Association members

Waterproof cardboard coating
Water resistant flower packaging
Waterproof cardboard boxes
Waterproof cardboard sheets
Liquiguard waterproof coating
Waterproof delivery boxes

Liquiguard Water Resistant Coating

Environmentally friendly alternative to waxed cardboard boxes

Liquiguard waterproof cardboard coating offers resistance to oil, grease and moisture. This makes it perfect for creating moisture resistant cardboard boxes for packaging greasy industrial components as well as wet and oily food such as fish (being FSA approved for food contact).

Waterproof cardboard packaging can also greatly reduce the need for secondary packaging – improving packing times – and being fully recyclable also helps to minimise disposal costs. Read More

Available Colours:

White cardboard material swatch
Brown Kraft cardboard material swatch
  • No obligation (and no pressure) quotes for any coating
  • Free and impartial advice from UK based experts
  • Competitive pricing and confidential trade service


More info on Liquiguard waterproof cardboard

Liquiguard is a water and oil resistant coating that has been developed for use across various industries.

Typical applications are for wet and oily products such as meat, fish, fruit, vegetables, and flowers, but it is also used successfully in moving automotive and industrial components that are greasy.

Using Liquiguard to manufacture waterproof cardboard packaging with resistance to moisture, oil and grease can also help to minimise or completely eliminate to need for secondary packaging such as bags and films. This not only reduces ongoing costs but can also help to shorten packing times and improve productivity.

Using waterproof cardboard provides improved performance over standard corrugated cartons, offering a higher level of protection to the packaged contents (helping to minimise the costs of damage during transit or storage).

Liquiguard coated packaging also boasts enhanced durability and lifespan, allowing it to be re-used multiple times.

Unlike many other forms of water-resistant corrugated packaging – such as plastic-coated cardboard – Liquiguard is also completely biodegradable and recyclable. This means that disposal costs for the end user are also vastly reduced.

And finally, Liquiguard is FSA approved for direct contact with food.

Why use Liquiguard coated board at your sheet plant

Liquiguard coating allows your sheet plant to offer high quality, moisture, and oil resistant corrugated packaging to your customers. Similarly, all of the coatings available at GWP Coatings provide your business with the ability to offer your customers a wider range of products and options.

Not only can this be the difference in winning new business, but it can also allow for upselling to existing customers. Ultimately, it can increase your sales and have a direct, positive impact on your bottom line.

Runs for Liquiguard waterproof cardboard sheets start from as low as 200sq. metres, with lead times between 24 and 48 hours. This allows you to be more responsive to urgent requirements, as well as the flexibility to offer your customers lower volumes too (ultimately boosting sales figures).

Liquiguard waterproof cardboard coating can be safely handled without protective clothing (PPE), and is easily converted on the vast majority of standard equipment (more so than traditional waxed cardboard sheets).

It can be overprinted, glued and due to being completely inert, any waste materials can simply be recycled in the same manner as normal corrugated (unlike film coated alternatives).

You can also choose to either supply the board to be coated or source both material and coating directly from GWP – the latter ensuring compatibility and minimising transit costs.

Finally – and crucially – Liquiguard and all GWP’s coated material can be supplied as part of a confidential, trade agreement.

Conversion Information

Liquiguard waterproof cardboard coating is a blended waterborne acrylic lattice, which creates a totally non-hazardous inert translucent film when coated and dried onto paper or corrugated cardboard, whilst containing only water as the carrier system with no halogenated compounds or hydrocarbon co-solvents.

The materials used to manufacture Liquiguard coating are acrylic emulsions which are fully biodegradable and recyclable on normal paper materials.

Liquiguard is FDA approved for direct contact with food, but care should be taken when it is applied to test liners as the make-up of the test liner cannot be guaranteed.

It is readily accepted at paper mills who prefer it over polylined or wax impregnated cardboard, both of which are not environmentally friendly.

The minimum run is normally 200 sq. metres onto any fluted board grade, with a maximum board size of 1500 x 3000 mm.

Liquiguard waterproof cardboard coating requires special PVA adhesive for cold gluing or a hot melt adhesive which can be advised on.

Liquiguard is excellent for storing frozen foods and will not separate from the liner and can also be used for ‘cook in the box’ products.

Best results are obtained on pure kraft or white top kraft liners. Test liners can be used; however, these are not certificated.

Liquiguard can be applied to either one or both sides of corrugated board and gives a clear finish but tends to darken the underlying paper.

It can normally be overprinted with water based Flexographic inks or, alternatively, can be used over the top of Spectrumcoat coloured or other pre-printed board to give an enhanced visual appearance.

Key benefits of Liquiguard waterproof cardboard at a glance

  • Corrugated packaging products with resistance to moisture, oil, and grease
  • Fully biodegradable, ensuring recyclability and minimising disposal costs for the end user
  • Food Standards Authority (FSA) approved for direct food contact
  • Eliminate the need for secondary packaging, reducing packing times and boosting productivity
  • Increased lifespan over uncoated corrugated, leading to lower lifetime costs
  • Runs from as low as 200 sq. metres, allowing you to offer lower volumes to your customers
  • Safe to handle, eliminating the need for PPE and improving workforce efficiency
  • Easily converted on standard machinery, including over-printing
  • Short lead times (usually within 48 hours) enabling you to respond to urgent requirements


Test and Perfomance Data

For performance details of the Liquiguard waterproof cardboard coating, please continue reading below.

Alternatively, for full technical specifications, benefits, applications, and conversion information, please download the datasheet here.

Cobb Test

The endurance of water and oil resistant board is normally measured by the Cobb and 3M tests.

This determines water absorption. There are three exposure times used: 1 minute, 3 minutes and 30 minutes.

The test involves a known volume of water (100 ml) being poured onto a specific area of the board’s surface (100 cm2). The board is weighed before and after the exposure and the difference between the two can then be expressed as the weight per unit area of water absorbed in that given time, so the lower the Cobb value the better the result.

Typical test results obtained on Liquiguard material are below:

Cobb: 3 minutes = 2.0

Cobb: 30 minutes = 10.0

3M Kit Test

This involves putting five separate drops of various solvents onto the boards surface and inspecting it after 15 seconds to see if any pinholes appear (visible as dark specks).

The solutions range from a thick vegetable oil to thinner substances like white spirit. Each solution is numbered up to a maximum of 12 and the higher the number achieved the more resilient the surface.

Typical test results obtained on Liquiguard material are below:

3M Kit Test: = >12


Frequently Asked Questions on Liquiguard

Please see below for a collection of the most commonly asked questions regarding Liquiguard.

Can cardboard really be waterproof?

Whilst cardboard cannot ever be completely waterproof, Liquiguard coating allows for treated surfaces to become highly water resistant. This not only makes any packaging manufactured from waterproofed cardboard sheets more durable, but also makes it suitable for packaging wet, oily, or greasy products (e.g. fish, greased industrial components etc.).

Why should I use Liquiguard waterproof cardboard sheets?

Liquiguard is arguably the highest quality waterproof cardboard coating available today, manufactured in an ISO accredited environment from 17kg of coating per 1,000sq. m of board, compared with just 7kg from other manufacturers.

Can I get both waterproof cardboard sheets and packaging / boxes?

GWP Coatings typically supplies coated material to trade customers for them to convert into packaging products as per their customer requirements. However, the Packaging division of the GWP business are able to offer custom packaging boxes and products utilising Liquiguard material.

I only need a low volume of waterproof cardboard – can you help?

The efficiency of the coating equipment used at GWP Coatings allows you to specify runs from as low as 200 sq. metres (in turn allowing you to competitively supply smaller orders to your customers). With a stock holding of various board grades and efficient processes, you can also benefit from lead times that are typically within forty-eight hours. GWP are happy to coat any board supplied to us as well.

Free Quotes / Advice

No obligation quotes and genuinely impartial advice

As official members of the Sheet Plant Association (SPA), GWP Coatings has supplied sheet plants across the UK with the highest quality coated board for more than 20 years.

This experience not only means that your business can select from a wide product range – everything from water resistance to Pantone colours and much more – but also you can benefit from genuinely impartial advice (from a knowledgeable and friendly support team) on the best solution for your specific requirement.

And you can be assured that all coated board you purchase from GWP is done so on a completely confidential trade service.

Alternative Coatings

Wide selection of specialist finishes for corrugated cardboard

Waterproof cardboard isn’t the only specialist material that you can source from GWP. Please see below for further options.

Spectrumcoat pantone colour flood coating

Spectrumcoat Pantone Colours

From 200 sq. m
Enquire for details

Cardboard packaging inserts coated with Anti abrasion coating

Nomar Anti Scuff / Abrasion

From 200 sq. m
Enquire for details

Corstat conductive ESD cardboard sheets

Corstat® ESD Cardboard

From 200 sq. m
Enquire for details

Anti corrosion cardboard coating

VCI Corrosion Inhibitor

From 500 sq. m
Enquire for details

Additional Products

Other packaging products you can source through GWP

A gable style Correx box in red material with white printed logo

Correx® Products

Durable Correx® products for various applications


Corrugated Boxes

Everything from transit packs through to ecommerce & POS

Engineered foam inserts

Foam Inserts

Expertise in foam conversion for more than 25 years

Corriplast conductive packaging

Anti Static

Huge selection of prefabricated ESD safe packaging / boxes

protective cases

Protective Cases

Widest range of protective cases from a single UK supplier

Cardboard ecommerce packaging

All Packaging

A huge array of diverse packaging products tailored to you

Quotes, technical info and advice

Get your no obligation, tailored quote or impartial product advice

    Required details

    Additional info

    For full details on how GWP treats your data, please view this Privacy Policy. Your information is not shared with any third party.

    Here to help

    Speak directly with one of our coatings experts

    Fiona Churchward, GWP Conductive product adviser

    Fiona Churchward

    Product Adviser
    01793 754 457

    Elliott Melbourne, GWP Sales Coordinator

    Elliott Melbourne

    Sales Coordinator
    01793 754 457

    Emily Parker, GWP Correx sales office manager

    Emily Parker

    General Manager
    01793 754 444

    Phone GWP Coatings

    01793 754 457

    Mon – Fri 08.30 – 17.00

    Email GWP Coatings

    Email a board coating expert

    Get in touch if you would you like to see how your sheet plant can boost sales by using Liquiguard waterproof cardboard...