GRS Crystalcast M248 – Plaster-Bonded Investment for Glass Casting & Pâte de Verre
GRS Crystalcast M248 – Plaster-Bonded Investment for Glass Casting & Pâte de Verre
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In stock
Ordered and paid on a working day: usually ships the same day
Delivery to Netherlands: usually within 1 working day
In stock
Ordered and paid on a working day: usually ships the same day
Delivery to Netherlands: usually within 1 working day
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Plaster-bonded investment for glass casting
GRS Crystalcast M248 is a plaster-bonded powder developed specifically for casting glass. Thanks to its solids content and gas permeability, firing temperatures up to 900 °C are possible, depending on size even for up to 10 days. The investment is made for finely detailed glass work: the mould stays strong during firing and becomes powdery afterwards, so it is easy to remove. You mix 100 parts powder with 32 parts water and have approx. 4 minutes working time.
Key benefits
- For glass casting: developed specifically for glass and pâte de verre.
- Heat resistant: firing temperatures up to 900 °C.
- Strong during firing: the mould holds its shape.
- Easy to remove: the investment turns powdery after firing.
- Fine detail: suitable for detailed glass work.
Typical applications
- ✓ Glass casting using the lost-wax method
- ✓ Pâte de verre
- ✓ Finely detailed glass objects
Application
- Weigh powder and water accurately in a 100 : 32 ratio by weight. A different ratio affects the strength and behaviour of the mould. Work with clean materials and preferably mix under vacuum.
- Mix for approx. 4 minutes, long enough for a homogeneous mixture.
- Pour immediately after mixing; the working time is approx. 4 minutes.
- Let the mould set undisturbed and do not touch it.
- Remove the wax preferably with steam. This can take up to 4 hours; longer may damage the mould.
- Fire the mould: raise the kiln temperature by no more than 50 °C per hour to 850 °C and hold that temperature for approx. 30 hours, depending on size. Then cool at no more than 10 °C per hour. The drying time depends strongly on the thickness and the number of moulds in the kiln.
Points to note
- ✓ The powder can release dust containing crystalline silica. Work with as little dust as possible, with extraction or good ventilation, and wear a dust mask (FFP2 or FFP3).
- ✓ Protect the powder from frost and moisture. Stored dry, the shelf life is 12 months.
Professional support
Not sure which investment or firing cycle suits your model? Email us at info@siliconesandmore.com and we will be happy to help.
| Type | plaster-bonded investment for glass casting |
|---|---|
| Colour | white |
| Mix ratio powder | water: 100 : 32 by weight |
| Mixing time | 4 minutes |
| Working time | 4 minutes |
| Setting time | 3 hours |
| Density of mixture | 1.80 g/cm3 |
| Maximum firing temperature | 900 °C |
| Shelf life | 12 months, dry and frost-free |
| Packaging | 22.5 kg |
Safety Information
This product can release dust containing crystalline silica. According to the GRS safety guidance for silica-based products, it may cause damage to the lungs through prolonged or repeated exposure by inhalation (H373). Signal word: Warning. Do not breathe the dust (P260) and wear respiratory protection if ventilation is inadequate (P284), at least an FFP2 mask. Work with as little dust as possible, use extraction or good ventilation and wear gloves and eye protection. Always consult the supplied safety data sheet (SDS) for full information on hazards, handling, storage and first aid.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
Required protection (ISO 7010)
    |
| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | H373 | May cause damage to organs through prolonged or repeated exposure | P260 P501 |
|
Frequently asked questions
What is the delivery time for my order?
Orders placed and paid on working days are in most cases shipped the same day. Weekend orders are processed on the next working day.
Indicative delivery times: Netherlands usually within 1 working day, Belgium and Germany typically 1–2 working days, other countries depending on destination and carrier. These are guidelines, not guarantees: peak periods, public holidays or carrier delays can have an effect.
What is the return policy?
You have 30 days to return after receipt. Email info@siliconesandmore.com within 30 days of delivery with your name and order number. The full conditions are in our return policy.
How can I track my order?
As soon as your order has shipped, you'll receive a track & trace code by email. It can take up to 24 hours before the code is active.
I have a problem with my order – how do I reach you?
Contact us via our contact page or email info@siliconesandmore.com. We're happy to help you quickly.
Can I order as a business?
Yes. Apply for a business account; we review your application within 3 working days. After that you order while logged in and pay on invoice, with payment terms of 14 days after delivery.
EU businesses outside the Netherlands with a valid VAT number order with VAT reverse-charged (0%, intra-community supply). The VAT number is stored in your business account; it cannot be added to an order after it has been placed.