Good Moisture Protection Silicone Encapsulants 184 Clear Silicone
Elastomer For Electronics Parts Encapsulation
Product Description
MCSIL-E184 Silicone Encapsulant, is supplying this product in
2-part separate liquid component kits, consisting of base and
curing agents. When mixed thoroughly, the compound turns into a
flexible elastomer. The mixing process should be done using a
weight or volume ratio of 10:1.
COMPOSITION
Two-part
10 to 1 mix ratio
Polydimethylsiloxane elastomer
It is not confined only to the electronics industry, but it is also
used extensively in the electrical industry such as transformers,
solar cells, ferrite cores, equipment modules, etc. Its intrinsic
property is suitable for outdoor usage because silicone is
resistant to ozone and ultraviolet rays; hence, preventing
pre-mature degradation.
Applications
MCSIL-E184 Silicone Encapsulant is suitable for:
LED Lighting encapsulation
Power supplies
Connectors
Sensors
Industrial controls
Transformers
Amplifiers
High voltage resistor packs
Relays
Adhesive/encapsulant for solar cells
Adhesive handling beam lead integrated circuits during processing
Features
Flowable
Room temperature and heat cure
Good dielectric properties
Rapid, versatile cure processing controlled by temperature
High transparency allows easy inspection of components.
Technical datasheet of Electronic Potting Silicone Encapsulates
| Item No. | RTV184 |
| Before curing |
| Appearance | transparent |
| Viscosity (mPa.s 25°C) | 3500 |
| Density (g/cm3 ) | 1.03 |
| Working life (min 25°C) | 150 mins |
| Curing time (hrs) | 24 |
| Heat-up at 100°C (min) | 10 |
| After curing |
| Hardness (shore A) | 43 |
| Dielectric breakdown voltage kv/mm 25°C | 19 |
| Thermal conductivity | 0.27 |
| Working temperature °C | -45~200 |
Note: Mechanical and electrical performance data tested at 25°C 7
days after curing, relative humidity of 55%; all the tested data is
average value.
APPLICATION METHODS
Automated metered mixing and dispensing
Manual mixing
MIXING AND DE-AIRING
The 10 to 1 mix ratio these products are supplied in gives one
latitude to tune the modulus and hardness for specific application
needs and production lines. In most cases de-airing is not
required.
PREPARING SURFACES
In applications requiring adhesion, priming will be required for
many of the silicone encapsulants. For best results, the primer
should be applied in a very thin, uniform coating and then wiped
off after application. After application, it should be thoroughly
cured prior to application of the silicone elastomer. Additional
instructions for primer usage can be found in the information
sheets specific to the individual primers.
PROCESSING/CURING
Thoroughly mixed silicone encapsulant may be poured/dispensed
directly into the container in which it is to be cured. Care should
be taken to minimize air entrapment. When practical,
pouring/dispensing should be done under vacuum, particularly if the
component being potted or encapsulated has many small voids. If
this technique cannot be used, the unit should be evacuated after
the silicone encapsulant has been poured/dispensed. Silicone
encapsulants may be either room temperature (25°C/77°F) or heat
cured. Room temperature cure encapsulants may also be heat
accelerated for faster cure.
POT LIFE AND CURE RATE
Cure reaction begins with the mixing process. Initially, cure is
evidenced by a gradual increase in viscosity, followed by gelation
and conversion to a solid elastomer. Pot life is defined as the
time required for viscosity to double after base and curing agent
are mixed and is highly temperature and application dependent.
USEFUL TEMPERATURE RANGES
For most uses, silicone elastomers should be operational over a
temperature range of -45 to 200°C (-49 to 392°F) for long periods
of time. However, at both the low and high temperature ends of the
spectrum, behavior of the materials and performance in particular
applications can become more complex and require additional
considerations and should be adequately tested for the particular
end-use environment.
LIMITATIONS
This product is neither tested nor represented as suitable for
medical or pharmaceutical uses.
USABLE LIFE AND STORAGE
Shelf life is 12 months from the production date found on the
product label. Special precautions must be taken to prevent
moisture from contacting these materials. Containers should be kept
tightly closed and head or air space minimized. Partially filled
containers should be purged with dry air or other gases, such as
nitrogen.
