Silicone rubbers for lead/tin/bismuth alloys

in stock

ATOS BESANA s.r.l. produces different types of high quality and high temperature resistance silicone rubbers realised through a very equipped analysis laboratory for a continuous research and development of our products as the market requires and modern technologies.

We can group the different silicone rubbers in four families:

Silicone rubbers for zinc alloys (THT series with very high resistance to the temperature);
Silicone rubbers for lead/tin/bismuth alloys (MEX series);
Silicone rubbers for resins (with low vulcanisation temperature);
Silicone rubbers for lost wax (MCF series).

The standard vulcanisation temperature is normally 175/180°C but all our silicone rubbers can be realised at 120°C or 80/90°C on request.

The advantage of lower vulcanisation temperature is a lower shrinking during the vulcanisation cycle as well as the possibility to use resin, plastic, wood and wax models which normally have deformations and broking for higher vulcanisation temperature and pressure. See the following technical label :

VULCANISATION TEMPERATURE	VULCANISATION TIME	SHRINKING	SUGGESTION
175/180 °C	2 – 2,5 minutes for each mm. of thickness	3,0-4,0%	Standard vulcanisation pressure
120 °C	2,5 – 3 minutes for each mm. of thickness	2,0-2,5%	Low vulcanisation pressure
80/90 °C	3 – 3,5 minutes for each mm. of thickness	0,5-1,0%	Low vulcanisation pressure

Available besides a big range of casting and moulding accessories.

Description

COLOUR	HARDNESS SHORES	APPLICATION	VULCANISATION TEMPERATURE
GREY RC/A	55 ± 2	Very high elongation, it is used for very undercut pieces in tin/lead alloys	180°C (on request 80/90°C or 120°C)
GREEN MEX	56 ± 2	high elongation, it is used for very undercut pieces and costume jewellery, medium resistance to the temperatu	180°C (on request 80/90°C or 120°C)
GREY RC/B	60 ± 2	Good elongation, it is used for undercut pieces in tin/lead alloys	180°C (on request 80/90°C or 120°C)
LIGHT-BLUE MEX	62 ± 2	Medium elongation, it is used for low undercut pieces, medium resistance to the temperature	180°C (on request 80/90°C or 120°C)