RTV-2 silicones are used in a wide range of industries and applications. They serve to produce flexible molds for manufacturing a and an array of technical and mechanical parts for industry. The liquid silicone rubber "Silast D-2" is a viscous, self-spilling paste designed for pouring in order to isolate and seal different parts and details. Before use, mix with the hardener in an amount depending on the desired rate of curing. When the paste has stayed unused for a long time, it tends to become thixotropic or to form layers. After stirring, it goes back to its properties.Before use and before mixing with the hardener, the paste should be mixed well with a mechanical stirrer. To the homogenized paste add hardener in a ratio of 5-6 parts by weight hardener to 100 parts by weight paste. The amount of the hardener is chosen depending on the desired cure speed, weight involved, ambient temperature, air humidity in the room and the skill of working with the material. Agitation of the paste with the hardener must ensure an even distribution of the two components and can be carried out for about 5-10 minutes. Before pouring the paste, it is desirable that it is left to rest for a few minutes in order to be deaerated.