Art & Crafts : Silicone TCS – 30

TCS-30 Tin Cure Silicone Rubber – Mould Making Silicone

Professional Two-Part RTV Silicone | Shore A 30 | Mould Making & Casting

TCS-30 is a high-performance, two-part, room-temperature curing (RTV) silicone rubber manufactured by AMT Composites. This tin/condensation cure silicone is designed for creating flexible, durable and detailed moulds for a wide variety of casting applications.

Suitable for poured block and cavity moulds as well as brush-on mould making, TCS-30 can reproduce intricate surface details and is ideal for creative, craft and industrial mould-making projects.

Key Features & Benefits

• Shore A 30 hardness – Flexible silicone with good tear strength.
• Excellent detail reproduction – Suitable for detailed moulds and intricate designs.
• Room-temperature curing – No special heating equipment required for standard curing.
• Versatile applications – Suitable for poured and brush-on silicone moulds.
• 40-minute working time – Allows time for careful mixing, pouring and bubble removal.
• 24-hour demoulding time – At the recommended room temperature of 23°C.
• Compatible with various casting materials – Including gypsum plaster, cement, resin, wax and soap.
• Optional silicone thinner – Can reduce viscosity for easier pouring and improved flow into detailed areas.

Technical Specifications

Property	Specification
Product	TCS-30 Tin Cure Silicone
Silicone Type	Two-part RTV, tin/condensation cure
Mixing Ratio	100:2 (Part A : Part B)
Measurement Method	By weight
Pot Life / Working Time	Approximately 40 minutes
Demoulding Time	24 hours
Recommended Curing Temperature	23°C
Hardness	Shore A 30 ±2
Viscosity	20,000 CPS
Tear Strength	23 N/mm
Elongation at Break	350%
Linear Shrinkage	0.3%
Specific Gravity	1.21

Mixing Instructions

Important: All mixing ratios are measured by weight, not volume.

1. Stir Part A and Part B separately before measuring to ensure any settled ingredients are properly incorporated.
2. Weigh the required amount of Part A into a clean mixing container.
3. Add Part B at a ratio of 2% of the Part A weight.
4. Mix thoroughly for approximately 3 minutes, scraping the sides and bottom of the container.
5. Transfer the mixture into a second clean container and stir again.
6. Avoid vigorous mixing, as this can introduce unnecessary air bubbles.
7. For best results, vacuum-degas the silicone before pouring.
8. Pour slowly in a thin stream into the lowest point of the mould housing, allowing the silicone to flow naturally around the model.

Pot Life / Working Time – 40 Minutes

TCS-30 has an approximate pot life of 40 minutes, allowing sufficient working time for mixing, vacuum degassing and pouring the silicone into your mould housing.

Important: The 40-minute working time starts once Part A and Part B are mixed together.

Increasing the catalyst percentage above the standard 2% will reduce the available working time.

Demoulding Time: 24 hours at 23°C (room temperature).

Mixing Ratio Examples

Part A – Silicone	Part B – Catalyst
100 g	2 g
250 g	5 g
500 g	10 g
1,000 g	20 g
5,000 g	100 g

Please note: Always measure the correct catalyst quantity. Do not automatically use the entire bottle of Part B supplied with your kit.

The catalyst level may be increased up to 4% for faster demoulding, but this reduces the available working time.

Optional Silicone Thinner

TCS-30 can be used with a compatible silicone thinning fluid, available separately in 500 g and 1 kg quantities. Silicone thinner reduces the viscosity of the silicone, helping it flow more easily into intricate areas and assisting with reducing trapped air bubbles.

Recommended maximum addition: 10% by weight.

Adding thinner will proportionally reduce the Shore A hardness and tear strength of the cured silicone. Customers should test their required dosage before producing a full mould. Silicone thinner is optional and is not required for standard TCS-30 mixing.

Suitable Casting Materials

TCS-30 moulds can be used with a wide range of casting materials, including:

• Gypsum plaster and gypsum-based casting materials
• Cement and concrete
• Epoxy, polyurethane and polyester resins
• Wax and candle-making materials
• Soap
• Low-temperature melting alloys

Important: Concrete and other abrasive casting materials can wear down mould details more quickly than non-abrasive materials such as wax and plaster.

Curing & Demoulding

Allow the silicone to cure for 24 hours at 23°C before demoulding.

AMT recommends that the silicone is not cured below 23°C.

For certain polyurethane resin and rubber casting applications, additional post-curing for 4–6 hours at 80°C can help remove residual moisture and alcohol produced during curing. Allow the mould to cool to room temperature before use.

Cleaning & Storage

• Clean finished moulds with mild soap and water.
• Rinse thoroughly and allow to dry completely.
• Store moulds on a flat surface in a cool, dry environment.
• Assemble multi-part moulds before storing to help retain their shape.
• Keep unused silicone components tightly sealed.
• Store uncured materials away from direct heat, ignition sources and foodstuffs.

Safety & Handling

• Work in a well-ventilated area.
• Wear suitable protective gloves and safety goggles.
• Avoid contact with skin and eyes.
• Avoid breathing vapours or mist.
• Wash hands thoroughly after handling.
• Keep containers sealed when not in use.
• Keep out of reach of children.
• Do not ingest.

First Aid: For eye or skin exposure, rinse with plenty of water for at least 15 minutes and seek medical advice if discomfort occurs. If swallowed, do not induce vomiting and contact a medical professional or poison centre immediately.

Although the supplied MSDS does not classify the finished product as a dangerous substance or mixture under the referenced CLP classification, appropriate protective precautions must still be followed.

Available Sizes

• 1 kg TCS-30 Kit – Part A silicone and Part B catalyst.
• 5 kg TCS-30 Kit – Part A silicone and Part B catalyst.

Optional Add-On Products:

• Silicone Thinner – 500 g
• Silicone Thinner – 1 kg

Silicone thinner is sold separately.

Stock Availability & Pre-Orders

Please note: This product is supplied on a pre-order basis.

We do not always keep TCS-30 silicone or silicone thinner in stock. Products are ordered from our supplier according to demand.

Please allow approximately 2–4 working days for supplier procurement, subject to availability, before your order is ready for dispatch or collection. Courier transit time is additional.

Customers are encouraged to plan their mould-making projects accordingly.

Pre-Order, Stock Availability & Pricing

Please note: This product is supplied on a pre-order basis.

We do not always hold stock of this product. Items are ordered from our supplier according to availability and customer demand.

• Supplier Lead Time: Approximately 2–4 working days, subject to availability, before dispatch or collection.
• Pricing: Prices are subject to change without prior notice due to supplier price adjustments, availability and other related costs.
• Price Confirmation: The price paid at checkout will be honoured for confirmed and fully paid orders. Any price changes will apply to new orders only.
• Availability: Should an item become unavailable after an order has been placed, we will contact you to discuss the available options.

We recommend placing orders in advance to avoid delays with your mould-making projects.

Important Disclaimer

Technical specifications and processing recommendations are based on information supplied by supplier. Actual curing times and mould performance may vary depending on temperature, mixing accuracy, additives and intended application.

Customers are responsible for testing the product to confirm suitability for their specific mould-making and casting requirements. For full handling, safety and technical information, please refer to the manufacturer’s Technical Data Sheet (TDS) and Material Safety Data Sheet (MSDS).