Zhermack HT 45 Translucent – Translucent Platinum-Cure Addition Silicone for Mould Making & Prototyping

Hard, translucent platinum addition-cure silicone for mould making, jewellery and rapid prototyping

Zhermack HT 45 Translucent is a pourable two-component platinum addition-cure silicone that cures at room temperature into a translucent mould with a hardness of Shore A 45. The mix ratio is 1:1 by weight. Thanks to its high hardness and mechanical resistance, HT 45 is suitable for dimensionally stable moulds of small, highly detailed objects with thin walls.

Key benefits

• Shore A 45: a firm, dimensionally stable mould that hardly deforms during casting.
• Tear strength 15 N/mm: suitable for repeated use.
• Stable mechanical properties: the cured rubber retains its properties over the long term.
• Precise reproduction: suitable for fine details and thin surfaces.
• 1:1 mix ratio: easy weighing, no calculations.
• Translucent: you can see the model through the mould.

Typical applications

• Mould making where mechanical resistance, dimensional stability and precision matter.
• Jewellery and small precision parts.
• Rapid prototyping of small, highly detailed objects with thin walls, such as turbine parts.
• Moulds for plaster, coatings and acrylic resins. For polyurethane casting resin, you are better off choosing a silicone from our silicones for polyurethane casting resin collection.
• Epoxy and polyester resins only with a release agent, see the explanation below.

Processing

1. Shake the base and catalyst separately to break up any sedimentation.
2. Weigh out both components 1:1; use a separate spoon for each component. A deviation of up to 5% does not change the end result.
3. Mix vigorously until the colour is uniform, scraping the bottom and sides of the container.
4. Degas the mixture within the 12-minute pot life and preferably pour from a height of approximately 30 cm.
5. Demould after approximately 2.5 hours at 23 °C. Use compressed air if necessary, and no sharp objects.
6. Additional pours are possible within 24 hours: the new layer bonds to the first.

At 40 °C the pot life and curing time are roughly halved. At 4 °C the pot life doubles and curing takes about three times as long.

Technical data

Colour of base, catalyst and end product: translucent. Density 1.11 g/cm³. Viscosity approximately 8,000 mPa·s. Pot life 12 minutes and curing time 2.5 hours at 23 °C. Hardness Shore A 45 after 24 hours. Tensile strength approximately 5 N/mm², elongation at break approximately 250%, tear strength approximately 15 N/mm. Service temperature −40 to 200 °C. Typical values after 24 hours of vulcanisation at 23 °C, not intended for preparing specifications.

Shelf life 18 months when stored between 5 and 27 °C. Do not mix up the caps of the base and catalyst.

Manufactured by Zhermack S.p.A.

Please note: inhibition with addition-cure silicones

This is a platinum addition-cure silicone. Curing can be inhibited by sulphur, nitrogen and tin compounds, latex gloves, some plasticines, condensation-cure silicones and certain 3D printing materials. The technical data sheet (TDS) also warns that some petrolatum oils can interfere with curing. If in doubt, carry out a small test first. Make sure the surface is clean, grease-free and dry.