Translucent platinum-cure silicone for mould making, concrete, and podiatry
ZA 13 Mould WT 45 is a pourable, two-component platinum-cure silicone that cures at room temperature to a translucent finished product with a Shore A 13 hardness. The mixing ratio is 1:1 by weight. With a working time of 45 minutes at 23 °C, there is plenty of time to mix, degas, and pour in a controlled manner; the mould can be demoulded after approximately 8 hours.
Key advantages
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Long working time of 45 minutes: provides room to degas and pour larger moulds in one go.
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1:1 mixing ratio: equal amounts of base and catalyst, easy to weigh.
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Low viscosity (4,500 mPa·s): flows well around fine details.
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Elongation at break 440%: ample margin when demoulding undercuts.
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Tear strength 12 N/mm: suitable for repeated use.
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Translucent: you can see the model through the mould.
Typical applications
- Mould making where dimensional stability and precise reproduction count.
- Concrete moulds and artificial stone, thanks to its good compatibility with concrete formulas.
- Podiatry and orthopedic impressions.
- Moulds for plaster, coatings, polyurethane resins, and acrylic resins.
Processing
- Shake the base and catalyst separately to eliminate sedimentation.
- Weigh both components 1:1; use a separate spoon for each component. A deviation of up to 5% will not alter the final result.
- Mix vigorously until the color is homogeneous, ensuring you scrape the bottom and sides.
- Degas the mixture to prevent air bubbles and pour, preferably from a height of about 30 cm.
- Demould after approximately 8 hours at 23 °C. If necessary, use compressed air; do not use sharp objects.
- Additional pouring can be done within 24 hours: the new layer will adhere to the first.
At 40 °C, the working and curing time are approximately halved. At 4 °C, the working time doubles, and the curing process takes about three times as long.
Technical data
Color of base, catalyst, and finished product: translucent. Density 1.07 g/cm³. Viscosity of the mixture approximately 4,500 mPa·s. Hardness Shore A 13 after 24 hours. Tensile strength approximately 3 N/mm², elongation at break approximately 440%, tear strength approximately 12 N/mm. Operating temperature −40 to 200 °C. Typical values after 24 hours of vulcanization at 23 °C, not intended for establishing specifications.
Shelf life of up to 12 months when stored between 5 and 27 °C. Do not swap the caps of the base and catalyst.
Produced by Zhermack S.p.A.
Attention: inhibition with platinum-cure silicones
This is a platinum-cure silicone. Curing can be inhibited by sulfur, nitrogen, and tin compounds, latex gloves, some plasticines, condensation-cure silicones, and certain 3D printing materials. The TDS also warns that some petroleum jellies may hinder the curing process. In case of doubt, perform a small test first. Ensure the surface is clean, grease-free, and dry.
