CHT Q-Sil 216 Optically Clear Silicone Encapsulant 250gm Kit

This is a 2-component, silicone elastomer system specially designed for electronic potting and encapsulation applications. It offers good protection against chemicals, environmental contamination, mechanical shock, vibration and impact damage. It can be employed in areas where low flammability is a prerequisite.

The cured elastomer can be repaired. The component parts have relatively low viscosities and are readily mixed either by hand or machine.

Features

• Non Yellowing under UV light
• Optically clear
• Low Viscosity
• Wide temperature range

Use and Cure Information

IMPORTANT: The 'A' part o fthe product contains the platinum catalyst, great care should be taken when using automatic dispensing equipment. Please ensure that it is not contaminated by residual hydride containing rubber in the dispensing equipment, as curing will result. If in doubt, its advised to thoroughly purge the equipment with a suitable hydrocarbon solvent or silicone fluid.

Mixing: Both the A and B parts should be well stirred to ensure the material is uniform and any settled the fillers have been remixed. Place the required amount of A and B parts by weight at the mix ratio shown opposite, in a clean plastic or metal container of approximately 3 times their volume, and mix until the colour of the mixture is uniform. For best results, we recommend degassing. Degas by intermittent evacuation, the larger volume of the mixing vessel helps prevent overflow during this operation. In the case of automatic dispensing with static mixing head, the two components should be degassed before processing. Recommended vacuum conditions are 30-50 mbar intermittently over 5-10 minutes. Cast the mixture either by gravity or pressure injection.

Inhibition of Cure: Great care must be taken when handling and mixing all addition cured silicone elastomer systems, ensuring that all the mixing tools (vessels and spatulas) are clean and constructed in materials which do not interfere with the curing mechanism. The cure of the rubber can be inhibited by the presence of compounds of nitrogen, sulphur, phosphorus and arsenic; organotin catalysts and PVC stabilizers; epoxy resin catalysts and even contact with materials containing certain of these substances e.g. moulding clays, sulphur vulcanised rubbers, condensation cure silicone rubbers, onion and garlic.

Technical Information:

Uncured Product:

• Appearance Clear Liquid
• Colour A Part Transparent
• Colour B Part Transparent
• Cure Type Addition
• Max Cure Hrs @ 25 °C 20 hrs
• Max Cure Mins @ 100 °C 60 mins
• Mix Ratio 10:1
• Pot Life mins 240 mins
• Rheology Viscous Liquid
• Self Bonding No
• Viscosity A-Part mPas Brookfield 5000 mPas
• Viscosity B-Part mPas Brookfield 1000 mPas
• Viscosity Mixed mPas Brookfield 4500 mPas

Cured Product:

After 1 hour at 100°C

• CTE Linear ppm/°C 275 ppm/°C
• CTE Volumetric ppm/°C 825 ppm/°C
• Colour Transparent
• Duro Shore A ASTM D 2240-95 40
• Blongation % ISO 37 100 %
• Linear Shrinkage % 0.2 %
• Max Working Temp +°C AFS_1540B 204 °C
• Min Working Temp - °C -55 °C
• SG BS ISO 2781 1.02
• Tensile MPa ISO 37 4.8 MPa
• Thermal Conductivity W/mK 0.18 W/mK
• UL 94V-0 No