SEMICOSIL® 950 UV B
SEMICOSIL® 950 UV B is used in combination with SEMICOSIL® 949 UV A as a sprayable, addition-curing, 2-part silicone rubber of low viscosity that cures extremely fast after activation by UV light exposure to a soft silicone elastomer.
特性
- UV-active and shadow curing catalyst
- to be used as SEMICOSIL® 949 UV A / SEMICOSIL® 950 UV B in 10 : 1 mixing ratio
- low viscosity
- extremely fast curing at room temperature (after UV-activation)
- shadow curing at room temperature
- low hardness (Shore 00)
- applied mixture offers process control option by UV light (contains UV-tracer)
SEMICOSIL® 950 UV B is designed to be used in combination with SEMICOSIL ® 949 UV A . To ensure homogenity component A must be stirred thoroughly before processing.
Surface preparation All surfaces must be clean and free of contaminants that will inhibit the cure of the 10 : 1 mixture of SEMICOSIL® 949 UV A / SEMICOSIL® 950 UV B. Examples of inhibiting contaminants are sulfur containing materials, plasticizers, urethanes, amine containing materials and organometallic compounds – especially organotin compounds. If a substrate’s ability to inhibit cure is unknown, a small scale test should be run to determine compatibility.
Handling The A-component contains an UV-tracer that is dispersed in the silicone. In order to guarantee homogenous product performance (curing time, UV-tracability) it is recommended to homgenize the A-side prior to application by stirring.
Mixing
SEMICOSIL® 950 UV B contains the platinum catalyst, component A the crosslinker. Even traces of the platinum catalyst may cause gelling of the component containing the crosslinker. Therefore tools (spatula, stirrers, etc.) used for handling the platinum-containing component or the catalyzed compound must not come into contact with this component. SEMICOSIL® 949 UV A should be thoroughly mixed with SEMICOSIL® 950 UV B at a 10 : 1 ratio by weight or volume.
To eliminate any air introduced during dispensing or trapped under components or devices a vacuum encapsulation is recommended.
Curing For the curing an UV lamp (Fe-lamp, D-bulb) with an emission between 250 and 350 nm can be used. It is recommended not to use lamp systems that emit light with a wavelength below 250 nm.
Curing time of SEMICOSIL® 949 UV A / SEMICOSIL® 950 UV B (10 : 1) is highly dependent on UV-activation. Significant differences in curing time are obtained for curing different layer thicknesses and for using different substrate materials. Typical values are given below.
- connector potting
- conformal coating for printed circuit boards
- encapsulation of electronic components
All surfaces must be clean and free of contaminants that will inhibit the cure of the 10:1 mixture of SEMICOSIL® 949 UV A / SEMICOSIL® 950 UV B.
Examples of inhibiting contaminants are sulfur containing materials, plasticizers, urethanes, amine containing materials and organometallic compounds – especially organotin compounds. If a substrate’s ability to inhibit cure is unknown, a small scale test should be run to determine compatibility.
Handling
The SEMICOSIL® 949 UV A component contains an UV-tracer that is dispersed in the silicone. In order to guarantee homogenous product performance (curing time, UV-tracability) it is recommended to homgenize the A-side prior to application by stirring.
Mixing
SEMICOSIL® 950 UV B contains the platinum catalyst, component A the crosslinker. Even traces of the platinum catalyst may cause gelling of the component containing the crosslinker. Therefore tools (spatula, stirrers, etc.) used for handling the platinum-containing component or the catalyzed compound must not come into contact with this component.
SEMICOSIL® 949 UV A should be thoroughly mixed with SEMICOSIL® 950 UV B at a 10 : 1 ratio by weight or volume.
To eliminate any air introduced during dispensing or trapped under components or devices a vacuum encapsulation is recommended
For the curing an UV lamp (Fe-lamp, D-bulb) with an emission between 250 and 350 nm can be used. It is recommended not to use lamp systems that emit light with a wavelength below 250 nm. An high power UV-LED may also be used (365 nm) for applications allowing minimum distance to the light source. As light penetration depth is reduced 365 nm in UV-LED in comparison with discharge lamp pretests are recommendable to check feasibility for specific application.
Curing time of SEMICOSIL® 949 UV A / SEMICOSIL® 950 UV B (10:1) is highly dependent on UV-activation. Significant differences in curing time are obtained for curing different layer thicknesses and for using different substrate materials. Typical values are given below.
Without UV-activation SEMICOSIL® 949 UV A / SEMICOSIL® 950 UV B cures at room temperature within 36 h, at 70°C within 20 min.
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