Zhermack HT 45 Translucent – Translucent platinum-cure addition silicone for mold making & prototyping

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

Zhermack HT 45 Translucent is a pourable two-component platinum addition silicone that cures at room temperature into a translucent mould with a Shore A 43 hardness. The mixing ratio is 1:1 by weight. Due 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 43: a firm, dimensionally stable mould that does not deform easily during casting.
• Tear strength 15 N/mm: suitable for repeated use.
• Stable mechanical properties: the cured rubber retains its properties in the long term.
• Precision in reproduction: suitable for fine details and thin surfaces.
• Mixing ratio 1:1: easy to weigh, no complex calculations.
• Translucent: you can see the model through the mould.

Typical applications

• Mould making where mechanical resistance, dimensional stability and precision are important.
• Jewellery and small precision parts.
• Rapid prototyping of small, highly detailed objects with thin walls, such as turbine components.
• Moulds for plaster, coatings and acrylic resins. For polyurethane casting resin, choose a silicone from our silicones for polyurethane casting resin collection.

Processing

1. Shake the base and catalyst separately to eliminate sedimentation.
2. Weigh both components 1:1; use a separate spoon for each component. A deviation of up to 5% will not change the final result.
3. Mix vigorously until the colour is homogeneous, scraping the bottom and sides.
4. Degas the mixture within the 12-minute working time and preferably pour from a height of about 30 cm.
5. Demould after about 2.5 hours at 23 °C. Use compressed air if necessary and do not use sharp objects.
6. Additional pouring can be done within 24 hours: the new layer will adhere to the first.

At 40 °C, the working and curing times are approximately halved. At 4 °C, the working time doubles and curing takes about three times as long.

Technical data

Colour of base, catalyst and final product: translucent. Density 1.11 g/cm³. Viscosity approximately 8,000 mPa·s. Working time 12 minutes and curing time 2.5 hours at 23 °C. Hardness Shore A 43 after 24 hours. Tensile strength approximately 5 N/mm², elongation at break approximately 250%, tear strength approximately 15 N/mm. Operating temperature -40 to 200 °C. Typical values after 24 hours of vulcanisation at 23 °C, not intended for setting specifications.

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

Produced by Zhermack S.p.A.

Note: inhibition in addition silicones

This is a platinum addition silicone. Curing can be inhibited by sulphur, nitrogen and tin compounds, latex gloves, some plasticines, condensation silicones and certain 3D printing materials. The TDS also warns that some petroleum jellies can hinder curing. When in doubt, perform a small test first. Ensure the surface is clean, grease-free and dry.