Detailed Product Description

Silicon rubber HY-638 application:
Silicon RTV (HY-638 ) is two parts condensation liquid silicon rubber that can
cure at normal temperature. It has excellent fluidity, tensile property and tear
strength, moderate flame-retardancy and linear shrinkage. Mainly used for the
manufacturer of products made of unsaturated resin, epoxy resin, polyurethane,
etc.

Silicon rubber(HY-638) features:
HY-638# silicon rubber is mainly with the advantages of good tensile strength,
high tear strength, high temperature resistance, high duplication times and
repeated use, etc. silicone rubber(HY-638) is the most suitable for small
products or fine and precision products which is difficult to demould. This
silicone rubber is one of the products with the highest use level in the
production of craftwork gifts and the shrinkage less than 0.2%.

Silicon rubber(HY-638) datasheet :
      ModelAppearanceViscosity (cs)Hardness (Ao)Tensile Strength (kgf/c)Tear
      Strength (kgf/)Elongation (%)Mixing ratio(%)Operating Time(H)Curing
Time(H)
      638White14000~1600025~28≥35≥25≥5002~30.52~4

silicone rubber (HY-638 RTV-2) instruction:
1. Adding curing agent 1%, the silicone can still be operated within 2.5 hours
and can be 
    demoulded after 6-8 hours.
2. Adding curing agent 2%, the silicone can still be operated within 50 minutes
to 1 hour and
     can be demoulded after 2-3 hours.
3. Adding curing agent 3%, the silicone can still be operated within 28 - 30
minutes and can
     be demoulded after 1.5-2 hours.
4. Adding curing agent 4%, the silicone can still be operated within 10 - 15
minutes and can
     be demoulded after 1 -1.5 hours.

Frequently asked questions of moulding silicone rubber
Why does the silicone rubber mold have few molding times?
       The silicone rubber mold has few molding times is due to follwoing
reasons: adding too much silicone oil which will destroy the molecular of
silicone rubber; making the mold for small and fine detailed products with
higher hardness silicone rubber which is easy to break; making the mold for
large products with soft silicone rubber which will reduce the tensile and tear
strength of the mold, and the mold will have deformation. Thus, we should take
the proper silicone rubber to make the mold for suitable products.

The infomration just for reference,need more information about RTV silicone
rubber for mold making,PLS feel free to contact with Miss Vivian at the number
of 0086-755-89948019 and the mobile 0086-13691994072. Welcome to visit 
www(dot)szrl(dot)net anytime .