High Tear Tensile Strength Brushable Liquid Silicone Rubber for Automation

Product Description
Specification
Addition Cured Silicone Rubber for Mold Making, which is also named addition
cure silicone rubber and platinum cure silicone rubber, is generally a two-
component liquid silicone rubber vulcanized under room temperature(RTV-2).

Applications
Addition Cured Silicone Rubber has extensive use,such as mold making of foods
(candy,cake, cookie,chocolate, ice cube, fondant etc), jewelries, tires, rapid
prototyping,life casting,realistic mask,epoxy resin products,candle,vacuum
foaming,making of prosthetic breast,artificial skin,human body,adult toys,baby
feeding nipples,phone case and so on.

Techinical Parameters
Model Code GTSIL-RVB00 GTSIL-RVB05 GTSIL-RVB10 GTSIL-RVB15
GTSIL-RVB20 GTSIL-RVB25 GTSIL-RVB30 GTSIL-RVB35 GTSIL-RVB40
Hardness-Shore A 0 5±2 10±2 16±2 20±2 25±2 30±2
35±2 40±2
Viscosity - Cps 2000+1000/-1500 3000-1000/-1500 3500-1000/-1500 3500-1000/-1500
20000±1000 14000-18000 6500-2000/-3000 8000-2000/-3000 8000-2000/-3000
Mixing Ratio - % 1:1/10:1 1:1/10:1 1:1/10:1
1:1/10:1 1:1/10:1 1:1/10:1 1:1/10:1 1:1/10:1
1:1/10:1
Tear Strength - KN/m2 >15 >9 >16 >18 >20 >22 >18
>16 >14
Tensile Strength - Mpa ≥2.5 >2 >3.8 ≥5 >6 >6 >7
>7 >7
Shrinkage -% 0.1% 0.1% 0.1% 0.1% 0.1% 0.1% 0.1% 0.1%
0.1%
Elongation - % ≥800% ≥750% ≥700% ≥650% ≥500% ≥500% ≥500% ≥450%
≥400%


Instructions for mixing process.

Mixing Ratio 1:1 by weight
Pot Life at 80°C, approx 5-7mins
De-molding Time at 80°C, approx 60mins

Polymerisation: Curing condition: 1hr at 80 centi degrees.

Hardness 26 Shore A
Tensile Strength (N/mm2) 60+/- 10
Elongation (%) 600+/-50
Tear Strength (N/mm) 27+/-2


How to use

1.Substrate Preparation
The surface of the original should be clean and free of loose material. If
necessary, and in particular with porous substrates, use a suitable release
agent such as petroleum jelly or soap solution.


2. Mixing
Thoroughly stir Part A (silicone base) before use as filler separation may
occur upon prolonged storage.
Weigh 100 grams Part A (silicone base) and 3 grams Part B (curing agent) in a
clean container. Mix together until the curing agent is completely dispersed in
the base. Hand or mechanical mixing can be used, but do not mix for an extended
period of time or allow the temperature to exceed 35°C (95°F). Mix suitably
small quantities to ensure thorough mixing of the par A (silicone base) and
part B (curing agent).

It is strongly recommended that entrapped air be removed in a vacuum chamber,
allowing the mix to completely expand and then collapse. After a further 1-2
minutes under vacuum, the mix should be inspected and can be used if free of
air bubbles. A volume increase of 3-5 times will occur on vacuum de-airing the
mixture, so a suitably large container should be chosen.

Caution: prolonged vacuum will remove volatile components from the mix and may
result in poor thick section cure and non-typical properties.

Note: If no vacuum de-airing equipment is available, air entrapment can be
minimized by mixing a small quantity of par A (silicone base) and part B
(curing agent), then using a brush, painting the original with a 1-2mm layer.
Leave at room temperature until the surface is bubble free and the layer has
begun to cure. Mix a further quantity of base and curing agent and proceed as
follows to produce a final mold.


3. Pouring the Mixture and Curing
Pour the mixed Par A (silicone base) and Part B (curing agent) as soon as
possible onto the original, avoiding air entrapment. The catalyzed material
will cure to a flexible rubber within 24 hours at room temperature (22°C-
24°C/ 71.6°F - 75.2°F) and the mold can then be separated from the original.
If the working temperature is significantly lower, the cure time will be
longer. If the room temperature or humidity is very high, the working time of
the catalyzed mixture will be reduced. The final mechanical properties of the
mold will be reached within 7 days.

Minimum Order: 200 kilograms

Click to Enlarge