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ZA 35 Mould Fast

ZA 35 Mould Fast
Types:
Weights (kg) select:
Curing time (minutes):

Bicomponent (base and catalyst) addition RTV silicone rubber that vulcanizes at room temperature. Indicated for the duplication of models with small recesses. Hardness 35 shore A.

 

Main Fields of Application:
Mould-making and model-making (for its remarkable reproduction accuracy, high dimensional stability and
high mechanical strength)
Art Ceramic (for its high dimensional stability and fluidity. Suggested for the reproduction of mother shape /
form).

  • Chemical and Physical Properties

    Mixing ratio

    1 : 1

    Specific weight

    1.16-1.18 g/cc

    Viscosity of pre-catalyzation mixture

    4100 ± 300 cP

    Mixing time at 23 °C

    1’

    Working time at 23 °C WT

    6'

    Setting time at 23 °C ST

    20'

    Shore A hardness after 24 hours

    35 ± 2 shA

    Breaking load

    3.0 ± 0.2 N/mm2

    Elongation at break

    300±20 %

    Tear strength DIE B

    7±1 N/mm

    Tear strength DIE C

    9±1 N/mm

     

    Instructions for use
    Take the two bi-component products supplied by Zhermack (base and catalyst) and shake before use. Weigh an equal amount of catalyst and base (ex. 100 grams of catalyst and 100 grams of base; within a 5% error range the end result is not altered). When extraditing the product from the container it is necessary to use two different spoons for each component to prevent contamination of the product. Once the product is weighed and it is assured that the base and catalyst are equal, the two components are inserted in a recipient and mixed thoroughly. It is important to check while mixing that no residue remains on the base and sides of the recipient. Mix energetically until the colour of the product is homogeneous. Once the product is mixed it is poured, preferably 30cm above the recipient into the mould. The working time is approximately WT (see table below) from the beginning of the mixing at 23°C. It is advised to vacuum the mixture to prevent air pockets. If the quantity used is less than what is needed to complete the duplication, complete the hardening of the silicone and than proceed with the addition of the remaining silicone needed. The material attaches to the silicone without altering the final result.


    The setting time (time the silicone needs to vulcanize) is about ST at 23°C (see table below). After the ST is complete, from the start of the mixing, we can separate the model from the mould. If necessary use compress air to facilitate this separation. It is important not to force this separation with sharp objects that can deform the final stamp. The silicon rubber is compatible with all gypsums, coatings, polyurethane resins and acrylic resins.


    Note: The working time and thus the setting time are reduced if the temperature exceeds 23°C (ex. If the temperature is
    40°C, the working time is halved and the setting time is approximately halved). If the temperature is less than 23°C both the working time and setting time increase considerably. (ex. If the temperature is 4°C, the working time doubles and the Setting time increases three times the minutes indicated at 23°C ).

  • Hardness
    35±2 shA
    Processing time
    6 perc
    Curing time (minutes)
    20 min