TFC silicone rubber type 5 is an addition-curing 1:1 kneading silicone with a final Shore A hardness of 40, which is easy and safe to dose and process. Due to its high drawing accuracy it offers a precise impression and is extremely dimensionally stable. The material does not stick, is physiologically harmless and has excellent mechanical properties. It is therefore very suitable for duplicating, e.g. in the field of model and mould making or as a moulding and design compound as well as for taking impressions on vertical objects or surfaces.
The two components are mixed in a 1:1 weight ratio. To do this, take an equal amount of each of component A and component B (weigh them!) and then knead both parts intensively and quickly (approx. 45 sec.) until a streak-free, homogeneous mixture is produced, recognizable by an even light red colour. The mixture can then be applied and removed from the mould after approx. 20 - 30 minutes. For removal and mixing, use vinyl gloves if possible and never use latex gloves, as this can prolong the setting time or prevent setting completely. Kneading with bare hands may shorten the setting time.
The two components are mixed in a 1:1 weight ratio. The mixture has a very good flowability and is therefore easy to pour. The mould produced in this way has a high tensile strength and flexibility, a very high level of detail in reproduction and excellent non-stick properties, which make it easier to release the models from the mould.
Technical data:
Colour: white (component A) and red (component B)
Mixing ratio: 1:1 according to weight proportions
Specific gravity: 1.9 g/cm³
Viscosity: kneadable
Mixing time at 20°C: 45 seconds manually
Working time (pot life) at 20°C: 2 - 3 minutes (100 g)
Curing time (demoulding time) at 20°C: 20 - 30 minutes
Shore A hardness after 24 hours: 40
Dimension change after 24 hours: < 0.2 %
Shelf life: at least one year
Attention: When working with addition-curing silicone rubbers, make sure that clean and dry containers are used. The surface of the object to be moulded should also be as dry and free of impurities as possible. Certain substances can prevent or slow down the curing of addition-curing silicone. These include condensation-curing silicones, organic rubbers, plasticizers, amines, heavy metals and sulphur-containing kneading compounds. At the contact surfaces between addition-curing silicone and the substances mentioned, vulcanization problems then occur, which render the mould and often also the model unusable. In case of doubt it is strongly recommended to check the material compatibility in a small preliminary test.
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