Capture a three-dimensional shape, a soft object or fine detail in a flexible impression mould. Pébéo Gédéo alginate is a seaweed-based powder that sets with water into a gel-like mould. It is also suitable for body impressions, such as a hand impression.
What is included?
- 500 g of alginate powder for making moulds.
- Water, measuring cups, mixing container, stirring tool, moulding container and casting material are needed separately.
Choose alginate for detailed shapes and soft or delicate models. First make an impression mould, then a separate cast. The amount needed depends on the size of the model and the space around it in the moulding container.
Making an impression mould
Prepare everything before mixing. Measure by volume: 1 part alginate to 2 parts water, using the same measure for both.
- Prepare the moulding container and model. Secure a separate object with modelling clay if needed, keeping it clear of the container walls. Shake the powder in a closed pack before use to help limit lumps.
- Add the measured powder to the water and mix for about 1 minute until smooth and uniform.
- Pour around the model immediately. Allow about 5 to 10 minutes to set until the mould is flexible but firm like a gel.
- Gently release the model from the mould. For body impressions, follow the pack instructions; do not use cutting tools against the skin.
Making the cast
Make the cast without delay: an alginate mould dries quickly. Use plaster, reconstituted stone or wax and follow that casting material’s curing instructions. For a two-part mould, fit the empty halves back together in the moulding container for support. Let the casting material set sufficiently before removing the cast. One alginate mould is intended for up to 3 casts, rather than long-term reuse.
Practical points
Warm water speeds up setting and cold water slows it down. Follow the pack instructions for your chosen model. Do not wash alginate residue down the drain.
Materials for moulds and casts
Explore materials for modelling and mould making and other creative materials.
