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Jesmonite® AC300 Kits

SKU: JES3003.5

Kit Size: 3.5kg (2.5kg Base & 1kg Liquid)
Sale price


Jesmonite AC300 is a water-based, two-component, acrylic polymer/mineral resin system. The system is suitable for a wide range of casting and laminating applications where the end-user wants to reduce the many risks associated with conventional solvent-based systems. A range of ancillary products including decorative and functional fillers, control chemicals, pigments and glass reinforcements are also provided making the material extremely versatile. The material is designed for internal use only and is fire-resistant and has achieved a Class '0' Fire rating. The material is an economical alternative to Jesmonite AC100 where external durability is not essential.

Mix ratio is 2.5:1 Base to Liquid. 

NB. Adjustments can be made to the ratio for the addition of additives such as stone and metal fillers, sands, lightweight fillers etc. Please refer to the specific sections of the instructions below. It is also possible to mix the material at a 3:1 ratio to produce a fast set which will help to fill joints, air bubbles, or join casts.


  • Mix Ratio 2.5:1 parts Based on the Liquid ratio by weight
  • Wet Density 1845 kg/m3
  • Dry Density 1745 kg/m3
  • Initial set 15 – 20 minutes (18°C, No Retarder)
  • Expansion on set 0.15%

Other Properties

  • Compressive Strength 30 – 35 Mpa
  • Tensile Strength (UTS) 20 – 25 Mpa
  • Bending Elastic Limit (LOP) 15 – 20 Mpa
  • Bending Strength (MOR) 50 – 65 Mpa
  • Youngs Modulus 5 – 6 Mpa
  • Impact Strength (Charpy) 30 KJ/m²
  • Moisture Movement <1%
  • Fire resistance B.S.476 Part 6&7 – Class ‘O’
  • Freeze/Thaw resistance Excellent -Test specimens undamaged
  • 12-month shelf life

Application Areas

Jesmonite AC300 is suitable for both cast and laminated decorative mouldings, and with the inclusion of suitable glass, reinforcements can be utilised for lightweight, high-impact panels. It also provides a Class 1 fire resistant surface coating for expanded foams for theme parks, theatre props, sculptures etc. The material provides users with a water-based alternative to standard Glass Reinforced Polyester for rigid moulds and tooling.

Key Attributes

  • Bulk supplied material to reduce costs and maximise transport efficiency
  • General-purpose material with a wide range of applications

Jesmonite Base

Jesmonite Base is the powder part used with AC100 Liquid and AC300 Liquid. Formerly known as Jesmonite AC Powder.

  • Mix ratio: 2.5 Base: 1 Liquid by weight.

It is also possible to mix the material at a 3:1 ratio to produce a fast set which can be used to fill joints, air bubbles, or joins castings.

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