Jesmonite FAQ

What Is Jesmonite?

Jesmonite is a composite material invented by Peter Hawkin in 1984. It was previously popular in the construction industry, primarily for the creation of high-quality surface materials, but it is now popular among artists, architects, and DIY crafters.

You may wonder why. It is because Jesmonite is considered the chameleon of building materials. It can replicate the look and texture of any surface finish be it wood, stone, or metal in different colors. It is the most popular eco-resin among designers and craftspeople all over the world because it is considered safer and easier to use when compared to other alternative materials.

What Is Jesmonite Made From?

Jesmonite is a composite substance, which means it is composed of more than one element. It is made from a combination of gypsum, a mineral formed from sedimentary rock, and an acrylic resin.

In simpler terms, Jesmonite is a combination of powder and liquid that, when mixed together and allowed to solidify, produces a strong and tough substance.

Is Jesmonite Eco-Friendly?

This is one of the most frequently asked questions about Jesmonite. Jesmonite is environmentally friendly. In fact, it is rated among the most environmentally friendly alternatives. It is made of gypsum, a natural material from sedimentary rock and is manufactured using a low-energy process.

It is also water-based, non-solvent, and contains no VOCs, making it more environmentally friendly than other materials. Though Jesmonite is also composed of plastic, which means it will not decompose, this however, makes it strong and durable, so items made with it will last.

Is Jesmonite AC100 Waterproof?

No, Jesmonite AC100 is not waterproof. Its high resistance to water and humidity does not make it waterproof. To achieve a waterproof surface, it needs to be sealed with a topcoat sealer. Without the sealer, it might eventually break if exposed to water for long. 

Is Jesmonite Food Safe?

Jesmonite has yet to be tested for food safety. Plates, bowls, and other tableware made from Jesmonite are purely decorative and should not be used to serve food. Thus, it is not recommended to put food, liquid, or other edibles on products made from Jesmonite.

Is Jesmonite Sustainable?

Yes, Jesmonite is a long-lasting substance. It is composed of gypsum and an acrylic liquid component. Its production process requires low energy.

Although we recommend using gloves and a mask when working with large amounts of Jesmonite, users do not need to work in a controlled environment because it is not dangerous to the skin or health.

Is Jesmonite Stronger Than Cement?

Jesmonite is stronger, lighter, and waterproof. Aside from that, Jesmonite is extremely smooth and, when done properly, is easier to sand than concrete. It can also produce more brilliant and strong colors than concrete.

Is Jesmonite Safer Than Resin?

Absolutely! Jesmonite is safer than resin. Resin contains VOCs which can be harmful to your health when inhaled either through the lungs or throat. Jesmonite, on the other hand, is VOC and solvent-free, which makes it more eco-friendly and safe for users.

What Can You Make with Jesmonite?

Jesmonite is a versatile material. You can make almost anything with it, from jewellery to planters to decorative tableware. You name it!

How Long Does AC100 Take to Set?

Jesmonite AC100 takes about 24 hours to set fully.

How Much Jesmonite Will I Need?

For every 1,000 mL of mold volume, you’ll need 1,750 g of completely mixed Jesmonite AC100 (1,750 g Jesmonite AC100 is 1,000 mL).

Which Jesmonite Should I Use for Making Jewellery?

Jesmonite AC100 is perfect for jewellery. But if you want a stone effect, AC730 will be the best option.

How Should I Finish My Jesmonite Creation?

The finishing process can begin with coarse sandpaper and progress to finer grades as desired. Both hand and power sanders can be used for the sanding procedure.

Is Jesmonite Microwave or Dishwasher Safe?

No, we do not recommend Jesmonite in either of these.

How Does Jesmonite Compare to Epoxy Resin?

When cast, both Jesmonite and epoxy resin have a translucent finish and can be made in many colors. The only difference is that epoxy resin takes up to 24 hours to set in the mold, unlike Jesmonite AC100 and AC730, which only require 20 to 30 minutes. Jesmonite is also environmentally friendly because it has no VOCs, unlike epoxy resin.

How Do You Mix Jesmonite Materials?

The standard ratio of Jesmonite powder to Jesmonite liquid is:

  • AC100 Liquids – 1 part by weight

  • AC100 Powders – 2.5 parts by weight

What Is a Good Adhesive to Use with Jesmonite?

Polyurethane adhesives or epoxy-based adhesives are good adhesives to use with Jesmonite, but epoxy adhesives are stronger.

What Type of Molds Can I Use with Jesmonite?

High-grade silicone molds are used with Jesmonite products because they are flexible, easy to de-mold, and easy to replicate fine detail. Plaster, Jesmonite, GRP, metal, wood, and glass can also be used with Jesmonite products, but the mold surface must be coated with a release wax/agent to facilitate de-molding.

What pigments Can I Use with Jesmonite?

Any color can be achieved when working with Jesmonite. It can also replicate any texture including wood, metal, fabric, stone, and leather.

How Do You Clean Up after Using Jesmonite?

After each use, wash the molds in warm, soapy water and leave them to dry completely before the next use.

What Is the Difference between AC100 and AC730?

Jesmonite AC100 is a water-based acrylic gypsum composite while AC730 is acrylic modified cementitious composite. AC100 is made of gypsum and can replicate smooth surface detail and contains decorative aggregates and is designed to replicate concrete and stone surfaces. AC730 is waterproof while AC100 is only water resistant and requires a sealer to protect it from elements.

What Is the Difference between AC100 and AC300?

Jesmonite AC100 and AC300 have the same properties. That is, they are both impact and fire-resistant, lightweight, and solvent and VOCs-free. But the difference is that Jesmonite AC300 contains less resin. It is also cheaper than the more common AC100 and it is perfect for making items that do not require much strength. Jesmonite Quadraxial Glass can be used in the casting process and lamination of AC300.

Where Can I Buy Jesmonite?

SSG Brands is one of the biggest distributors of Jesmonite. We have many Jesmonite products in stock including Jesmonite AC100, 200, 300, 630, 730, 830. Do you need Jesmonite for your next project? Shop here. You might also find these Christmas decoration tips using Jesmonite helpful.