Wacker Elastosil M 1470 – Kneadable Condensation Silicone for Mould Making & Model Making

Premium Kneadable Condensation-Cure Silicone for Professional Mould Making and Model Making Applications

Wacker ELASTOSIL® M 1470 is a kneadable, condensation-cure (tin-cure) 2-component silicone that cures at room temperature to a Shore A hardness of 45, a pink final colour and excellent mechanical strength. With a working time adjustable from 20 to 70 minutes via the dosage of Catalyst Paste T 40 (2 to 5 per cent by weight) and a demoulding time of 1 to 5 hours, this system gives you full control over working speed. The mix ratio is 100:2-5 by weight, with more catalyst resulting in faster curing and higher shrinkage. ELASTOSIL® M 1470 is ideally suited to applications where high hardness, low shrinkage and manual processing are essential. Please note: not suitable for food applications.

Key Benefits

• Shore A hardness 45: – relatively stiff-flexible final hardness, ideal for moulds of flat objects and surfaces with limited undercuts
• Working time adjustable from 20 to 70 minutes: – by dosing T 40 at 2 to 5 wt.% you can match working speed and pot life to your project
• Tensile strength 4.5 N/mm²: – high mechanical strength for durable moulds that survive multiple casts without deformation
• Tear strength > 10 N/mm: – good tear resistance when demoulding objects with fine details
• Elongation at break 230%: – sufficient elasticity to peel moulds with moderate undercuts off a model without damage
• Linear shrinkage 0.2%: – very low shrinkage during curing for dimensionally accurate reproductions
• Density 1.28 g/cm³ cured: – predictable material consumption when calculating mould volumes

Typical Applications

• Impression moulds for taking impressions of flat or slightly textured model surfaces
• Reproduction moulds for jewellery, charms and small detailed objects
• Model making and miniatures — figures, architectural details and prototypes
• Moulds for candles, wax and soap where high hardness and repeated use are required
• Fishing lure moulds for soft baits in PU or comparable casting resins
• Rapid prototyping moulds for plaster, polyurethane and epoxy in small series

Processing instructions:

1. Briefly knead Part A (light grey silicone paste) before use to eliminate any inhomogeneity.
2. Weigh out 2 to 5 parts by weight of Catalyst Paste T 40 per 100 parts by weight of Part A. More catalyst accelerates curing and shortens the pot life: 2% gives approx. 70 minutes working time, 3% approx. 50 minutes and 5% approx. 20 minutes.
3. Knead both components together thoroughly by hand until a homogeneous, streak-free pink colour is achieved. The red colour of T 40 serves as a visual check.
4. Within the pot life, shape or press the mixture onto the model, or press the model into a layer of rolled-out silicone.
5. Allow to cure fully at room temperature (23 °C / 50% relative humidity): approx. 4-5 hours at 2% T 40, 3-4 hours at 3% T 40 and 1-2 hours at 5% T 40.
6. Wait until everything has cured completely before demoulding.

Please note: Pot life and demoulding time depend on dosage, ambient temperature and humidity. Higher humidity or temperature accelerates curing. Never mix more than you can process within the pot life. Store in closed packaging, dry, cool and frost-free for a shelf life of at least 1 year.

Condensation-cure silicone — not food-safe: This product is not suitable for food preparation. For food applications, use our food-safe silicones.

Manufactured by Wacker Chemie AG, world market leader in the development and production of silicones for industrial and technical applications.

Professional Support

Our technical specialists can advise on the right T 40 dosage for your desired working speed, the influence of temperature and humidity on curing time and optimal processing for impression and reproduction moulds. Contact us for technical data sheets, processing guides or product advice.