General Questions

Jesmonite Product Questions

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

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.

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

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

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.

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.

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

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

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

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

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

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

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.

Jesmonite ancillary-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.

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.

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.

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.

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.