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General Product Questions

What are Jesmonite products made from?

Jesmonite products are composite materials, a combination of a reactive mineral base and a pure water based acrylic resin.

How should I store Jesmonite Base and Liquid?

As a basic rule liquid containers should be kept well sealed to prevent water evaporation and skin forming. They should be stored at a constant temperature between 5°C– 25°C and used within six months. Freezing must be avoided. Base should be kept dry and stored at 5°C – 25°C.

How do I mix Jesmonite materials?

Jesmonite products are supplied as a 2 pack kit, containing a reactive mineral base and a pure water based acrylic liquid. To mix the two compounds together you will require a Jesmonite High-shear Mixing Blade. High-shear Mixing Blades are essential for the proper mixing of all Jesmonite composite materials. They are specifically designed for adding Jesmonite Base into Jesmonite Liquids. The mixing action reduces air bubbles and ensures that the mix is smooth and free from lumps. Two sizes are available, 65mm and 105mm for different mix sizes. They are made from stainless steel, and will attach to all conventional drills

Are Jesmonite products safe?

All Jesmonite products are water-based, non-solvent and contain no VOC's.

Are Jesmonite products fire rated?

Jesmonite products have been tested in accordance with EN 13501-1 under the harmonised Euroclass System of reaction to fire performance of building products which has been adopted by countries across Europe.

Is Jesmonite food safe or is there a finish to make Jesmonite food safe?

Jesmonite materials are non-solvent and contain zero VOCs, however, please be aware that we have not tested any Jesmonite products for food safety.

Jesmonite material solutions can be used for decorative tableware; however, we would not recommend you place food or liquids onto the finished Jesmonite products.

What type products do Jesmonite offer?

Jesmonite products can be broken down into two categories; Acrylic Modified Gypsum Composites and Acrylic Modified Cementitious Composites (PGRC)

How long can Jesmonite liquid pigment be stored for?

Jesmonite liquid pigments can be stored for up to 12 months.

Is Jesmonite dishwasher/microwave safe?

It is not advised to use Jesmonite in either of these.

Is there a way of avoiding air pockets?

To remove air pockets on the Jesmonite material surface we would always recommend you brush a 1-2mm first layer of mixture into the mould first, before backing up with further Jesmonite material. The brushing technique will push out and remove air pockets. You can also vibrate the first layer of mixture to help the air escape from the surface.

General Creative Questions

How do I wash the moulds?

To clean the moulds after use, rinse with warm soapy water, and dry thoroughly before using again.

Which type of markets are Jesmonite products used for?

Jesmonite products are used within a wide range of decorative markets including craft, tableware, artwork, sculpture, lighting, furniture, marine vessels, film sets, architectural elements and cladding panels

Which sealer does Jesmonite recommend for home ornaments?

The most appropriate Jesmonite sealer for home ornaments would be Jesmonite Acrylic Sealer. Jesmonite Acrylic Sealer is a pure acrylic coating. It is durable, flexible, and UV resistant.

Are Jesmonite Liquid Pigments for use with all Jesmonite products?

All Jesmonite products can be pigmented to any colour required when used in conjunction with the Jesmonite Paste Pigments. Please be aware that the Jesmonite Liquid Pigments are not fully UV stable and are not designed for external use, we recommend you use them for internal projects only.

The Jesmonite Paste Pigments are intermixable and can be mixed together to create any colour required. Pigments must be added to Jesmonite Liquids by weight before the Base is added and mixing commences. Pigments are added at a maximum of 2% by weight of the total mix, or 20grams/kilo of total mix (Base and Liquids). 20 grams will produce a strong, saturated colour. For lighter colours simply reduce the addition rate until the desired colour is achieved.

What type of moulds can be used in conjunction with Jesmonite products?

High grade silicone moulds are predominantly used in conjunction with Jesmonite products due to the silicone offering high levels of flexibility whilst achieving increased ease of de-mould and fine detail replication. Rigid mould compounds including plaster, Jesmonite, GRP, metal, wood, and glass can be used in conjunction with Jesmonite products, however the mould surface would require a release wax/agent to be applied to assist the de-mould of cured Jesmonite products.

What type of colours and textures can be achieved with Jesmonite products?

Jesmonite products can be pigmented to any colour reference. Jesmonite can also mimic any texture and reproduce the effect of materials such as stone, metal, wood, leather and fabric.

What is a good adhesive to use with Jesmonite?

To bond cured Jesmonite materials you would need to investigate either an epoxy based adhesive or PU based adhesive. Most of our clients find that the 2 pack epoxy adhesives are stronger than the 1 pack adhesives.

Is Jesmonite heat and flame resistant for creating products such as, incense holders and candles.

We have not yet come across burn proof sealers, there may be something viable on the market, but they would need to investigate further and run their own tests.

Can you place Jesmonite products in a kiln?

We wouldn’t recommend placing Jesmonite products within a kiln or above

80 °C.

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