Silicone Addition Yellow 25 Set – Soft Addition-Cure Mould Rubber for Moulds & Prototypes
Silicone Addition Yellow 25 Set – Soft Addition-Cure Mould Rubber for Moulds & Prototypes
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Variant: 1 Kg Set
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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
In stock
Ordered and paid on a working day: usually ships the same day
Delivery to Netherlands: usually within 1 working day
Backorder: longer delivery time. Ask us for the current lead time.
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Premium Soft Addition-Cure Mould Rubber for Professional Mould-Making and Prototyping Applications
Silicone Addition Yellow 25 is a pourable, addition-cure (platinum) RTV-2 mould rubber that cures at room temperature. Added silicone oil makes this rubber softer and more free-flowing than our Green 30: its hardness is Shore A 22 and its viscosity 6,000 mPa·s. The components are mixed 1:1 by weight. The pot life is 60 minutes; the mould can be demoulded after 6 hours at 20 °C and is fully serviceable after 1 day. The yellow rubber has a tensile strength of 3.9 N/mm² and is suitable for moulds with undercuts and for casting epoxy, polyurethane and polyester.
Key Benefits
- Shore A 22 hardness – supple rubber from which models with undercuts are easily demoulded.
- Viscosity 6,000 mPa·s – flows easily around fine details and releases air well.
- Tensile strength 3.9 N/mm² – sufficient strength for repeated demoulding.
- Mix ratio 1:1 by weight – easy to weigh out and process.
- Pot life 60 minutes – plenty of time to pour and degas carefully.
- Fully serviceable after 1 day – quickly ready for the first casts.
Typical Applications
- Moulds of models with undercuts.
- Moulds for casting resins such as epoxy, polyurethane and polyester.
- Soft, flexible moulds for fine details.
- Prototypes and decorative pieces.
- Moulds for ornaments and jewellery.
Processing Instructions
- First stir component A and component B thoroughly, each separately.
- Weigh out A and B in a 1:1 ratio by weight. Only use components with the same lot number.
- Mix slowly and carefully in a figure-of-eight motion, without stirring in air.
- Preferably degas the mixture in a vacuum chamber immediately after mixing.
- Pour within the 60-minute pot life.
- Leave the mould to cure for at least 6 hours at room temperature. A slight increase in temperature speeds up curing, but air bubbles then have less time to escape.
If you want to apply the rubber with a spatula rather than pour it, add Silicone Thixo A (not Thixo C).
Good to Know: Silicone Oil
This mould rubber contains silicone oil. The oil does not take part in the crosslinking and may slowly bleed out over time, which can leave a greasy film on the mould surface and cause slight shrinkage. Clean castings thoroughly before painting or bonding them.
Important Warning: Inhibition of Addition-Cure Silicones
This is an addition-cure (platinum-cure) silicone. Curing can be disrupted by sulphur, nitrogen, amine compounds and metal salts. These substances are found in latex gloves, some plasticines, paints and adhesives, condensation-cure silicones, one-component silicone sealant, natural rubber and certain 3D printing materials, among others. If in doubt, carry out a small test first or apply a barrier coat of polyvinyl alcohol.
Silicones and More, specialist in high-quality mould rubbers and casting materials for professional makers.
Professional Support
Need a firmer mould with higher tear strength and no oil? Take a look at Silicone Addition Green 30. Unsure which mould rubber best suits your application? Contact us at info@siliconesandmore.com and we will be happy to advise you.
Product Properties
- Hardness22Shore AHardness of the silicone material
- ColorYellowColor of the finished product
- Viscosity6000mPa·sViscosity of the uncured silicone
- Density1.05g/cm³Density of the cured material
- Mix ratio1:1Mixing ratio A : B
- Tensile strength3.9MPaMaximum tensile force before breaking
- Pot life60minutesWorking time after mixing
- Cure time360minutesTime until full cure
Component Properties
- Color AYellowColor of component A
- Color BWhiteColor of component B
Application
- Use caseSoft moulds with undercuts, moulds for casting resins and prototypesIntended use
- Silicone type["Addition curing","RTV-2"]Type of silicone or polymer
- Cure speedNormalHow quickly the material can be demoulded
- Cure conditionRoom temperatureCondition under which the material cures
Safety Information
This mold rubber is not classified as a hazardous mixture under the CLP Regulation and carries no hazard pictograms or H statements. Component B can form hydrogen gas on contact with water, alcohols, acids, bases, amines or metal salts; keep the product dry and away from ignition sources. When heated above approx. 150 °C, a small amount of formaldehyde may be released. Wear nitrile gloves and safety glasses during processing and ensure good ventilation. Respiratory protection is not required under normal use, only where mist or spray forms (FFP1). Consult the safety data sheets for component A and component B for complete information on storage, disposal and emergency measures.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
Required protection (ISO 7010)
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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.