Zhermack HT 33 Translucent – Translucent Platinum Addition-Cure Silicone for Mould Making & Concrete

Translucent platinum addition-cure silicone for mould making, concrete and artificial stone

Zhermack HT 33 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 33. The mix ratio is 1:1 by weight. With a tear strength of 20 N/mm and an elongation at break of 460%, the cured silicone is strong and durable, while the translucent mould lets you see the model inside.

Key benefits

• High tear strength (20 N/mm): withstands repeated demoulding of undercut shapes.
• Shore A 33: firmer than ZA 13 and ZA 22, for moulds that need to hold their shape.
• Elongation at break 460%: ample margin when releasing the cast.
• Stable mechanical properties: the cured rubber retains its properties over the long term.
• 1:1 mix ratio: easy weighing, no calculations.
• Translucent: you can see the model through the mould.

Typical applications

• Mould making where dimensional stability and precise reproduction matter.
• Jewellery and small precision parts.
• Artificial stone and concrete moulds, thanks to good compatibility with concrete formulations.
• 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 20-minute pot life and preferably pour from a height of approximately 30 cm.
5. Demould after approximately 3.5 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 1.09 g/cm³. Viscosity approximately 7,500 mPa·s. Pot life 20 minutes and curing time 3.5 hours at 23 °C. Hardness Shore A 33 after 24 hours. Tensile strength approximately 6 N/mm², elongation at break approximately 460%, tear strength approximately 20 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 TDS also warns that some petroleum jelly oils can interfere with curing. If in doubt, carry out a small test first. Make sure the surface is clean, grease-free and dry.