Why silicone mould easy to break? Many customers pose the questions like this. When asked about the time of breaking, some people say the silicone mould easy to
break in demoulding time for some small parts, and most people reflect the silicone mould has a short service life. All customers wish that silicone mould has relatively
higher reproducing times, and be able to copy large quantities of products, because the cost to produce a silicone mould is relatively high, especially for large and
complex products. So, it’s time we explore the reasons of silicone mould easy to break.
This problem may largely due to improper hardness of silicone rubber to make silicone mould. There is a limit for silicone rubber, if its hardness is above 50 shore A, the
tensile and tear strength will be reduced, and it will be easily broken after the silicone mould has solidified. We should choose favorable hardness of silicone rubber to
make mould. Normally, the silicone mould will be in a weak and flimsy manner using the silicone rubber with a high hardness to make moulds for small sized products or
intricate and delicate designs.
The explanation for this phenomenon of silicone mould easy to break may be that the mixing ratio of catalyst is incorrect. The amount of curing agent has close
relationship with the operating time. The higher the room temperature, the less the amount added. And the silicone mould goes to harden and brittle for excessive use
of the curing agent(higher than 2% at room temperature 25℃).
Thirdly, why silicone mould easy to break involves the reason of too frequent use. In the process of work, silicone mould often leads to fatigue fracture under the longterm effect of cyclic stress. The properties of fatigue and fracture for silicone mould are dependent on the performance of the silicone rubber, such as its strength,
toughness, hardness, and the content of inclusions in material.
From what has been discussed above, we may draw the conclusion that choosing a high quality silicone rubber with features of proper hardness, wear resistance,
toughness, high temperature resistance, resistance to fatigue and corrosion resistance is very important to ensure that the silicone mould is not easy to break. Of course,
we can’t ignore these small details during the operation and maintenance