4808 Silicone Electronic Potting Sealant
Details
4808 Silicone Electronic Potting Sealant
Features:
1.Good flowability as supplied ,good self-debubbling performance
2.good resistance to temperature extremes
3.good electrical insulation performance and good arc ,corona and shock resistance
4.good resistance to water ,ozone and weathering
5.good adhesion to PPO,PET,PVDF and other materials
6.Non-corrosive to copper, aluminium, tin ,silver and many other materials
7.V-1 class fire resistance performance
8.good thermal conductivity
COLOURS
4808 part A is available in white or black fluid, and part B in clear or shallow yellow liquid. It is white or black fluid after mixing.
PACKAGING
4808 is available in kits: Part A in plastic pails (12kg), part B in plastic pails (2kg); or Part A in plastic pails (3kg), part B in plastic cartridges (300ml, 0.5kg).
Typical properties:
These values are not intended for use in preparing specifications.
Test Method | Property | Unit | Result |
As supplied |
/ | Appearance | Part A: white/black fluid Part B: clear liquid |
GB 16776 | Working time at 25℃ | min. | 12 |
GB/T 13477.5 (ASTM D 2377) | Tack free time | min. | 18 |
/ | Curing time | h | 24 |
Cured after 7 days at 23±2℃，RH 50±5% |
GB/T 531.2 (ISO 7619) | Hardness | Shore A | 45 |
GB/T 528 (ISO 37) | Tensile strength | MPa | 1.5 |
GB/T 528 (ISO 37) | Elongation at break | % | 70 |
GB/T 1692 | Volume resistivity | Ω·cm | 1×1015 |
GB/T 1695 (ASTM D 149) | Breakdown strength | kV/mm | 18 |
GB/T 1693 (ASTM D 150) | Dielectric constant（1MHz） |
| 3.2 |
/ | Linear shrinkage | % | 0.5 |
GB/T 10707 | Fire resistance rate |
| V–1 |
GB/T 11205 | Thermal conductivity | W/m·K | 0.4 |
STORAGE AND SHELF LIFE
4808 should be stored in original unopened containers over temperature from 4℃to 27℃ and be kept away from rain or direct sunshine.
4808 has a shelf life of 12 months from the date of manufacture.
4808 is non-hazardous for transportation.
HOW TO USE
Mix part A base to Part B curing agent at a ratio of 6:1 by weight or 4:1 by volume, and then pot the mixture into the parts of substrates where needed, place at room temperature for initial curing for about 2～4 hours before conducting the next procedure. If precipitation occurs in Part A, just stir it well before use, and this does not affect the performance of the sealant.
When using automatic dispensing machine, set at a ratio of 6:1 by weight or 4:1 by volume of part A to Part B for a test first and then put into use.
NOTES
Screw tight the cover of Part B immediately after use to avoid the exposure to atmospheric moisture
Part A base and part B curing agent should be fully mixed to ensure the homogenity of the sealant, or it affects the performance of the sealant.
Part A and Part B should be kept separately and get mixed on site, and be used within a short time after mixing.
For common low-voltage electrical potting, de-bubbling is not needed, but vacuum de-bubbling for 3～5 minutes is required for high voltage electrical potting.
