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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.


Properties

  • 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.

Storage

General recommendations SEMICOSIL® 950 UV B should be stored in the original light-tight container. After exposure to daylight or UV-light the material should be immediately processed and not stored any longer. The 'Best use before end' date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

Sales and support

Wacker Chemie AG
Heilbronner Strasse 74
70191 Stuttgart
Germany
+49  711  61942-0 (Phone)
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Gisela-Stein-Strasse 1
81671 Munich
+49  89  6279-0 (Phone)

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