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SEMICOSIL® 949 UV A/B

SEMICOSIL® 949 UV A/B is a pourable, 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

  • two-part, 10 : 1 mixing ratio
  • low viscosity
  • extremely fast curing at room temperature (after UV-activation)
  • low hardness (Shore 00)
  • offers process control option by UV-light (contains UV-tracer)

免责声明

所提供之所有信息均基于我们当前所掌握的知识。尽管如此,我们不对其作任何担保、也不承担任何责任,并且保留在任何时候进行技术变更的权利。购买方应在预测试中对所提供之信息以及产品在既定应用中的适应性进行检查。任何时候都必须以合同条款与条件为准。此外,本免责申明还适用于与第三方权利有关之事宜,尤其是在德国境外。

  • UV active encapsulant
  • Sealing of connectors (injection-molded thermoplastics + pins)
  • Allows short cycle times by fast solidification of silicone


 

Surface preparation

All surfaces must be clean and free of contaminants that will inhibit the cure of SEMICOSIL® 949 UV A/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. The UV-tracer may be subject to a limited sedimentation. In order to guarantee homogenous product performance (curing time, UV-tracability) it is recommended to homogenize the A-side prior to application by stirring.


Mixing

Component B of SEMICOSIL® 949 UV A/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.

The two components should be thoroughly mixed 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/B 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.

 


UV-activation Time (sec)      Curing time (140 mW/cm²) at 25°C (2mm)

5 sec                                     2 min

10 sec                                   1 min

20 sec                                   40 sec

 

Use of UV-LEDs

A cure with UV-LEDs is basically possible, however only under certain specific conditions:

  • 365 nm emssion
  • High-Power UV-LED
  • Minimization of distance Silicone surface to LED
  • Layer thickness < 5 mm (depth of light penetration smaller compared to cure with discharge lamps)
  • Matching of  area to be irradiated to UV-LED emission array

储存

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.

销售和支持

Wacker Chemicals (China) Co.,Ltd.
Caohejing Hi-Tech Park
200233 Shanghai
中国
+86  21  6130-2000 (电话)
+86 21 6130-2500  (传真)
Contact Sales
网站

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