Application Type Seal 1 Part or 2 Part 2 Part Material Form Gel Industry Circuits, Electronics, Optoelectronics Manufacturer Dow Chemistry Silicone, Solvent-free Cure Method Part A/Part B Cure Temperature (°C) 20 to 25, 150 Cure Time (min) 30 Viscosity (cPs) Low, 800 Color Clear High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -80 Light Refractive Index (RI) High
Technical Data for Dow SE 1885 M Kit
- Sealant - Seal
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
- Dispenser - Automated dispensing equipment
- 2-Part Cure - Part A/Part B
- Clear / Transparent - Clear
Cure Temperature (°C) 20 to 25, 150 Cure Time (min) 30 Viscosity (cPs) Low, 800 Work / Pot Time (min) Good Mix Ratio 1:1 (by volume)
High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -80 Moisture/Humidity Resistance Moisture/humidity resistance
Dissipation Factor 0.00020 Test Method Dielectric Strength (V/mil) 508, Excellent Dielectric Constant 2.75 Test Method Volume Resistivity (O) 9.3E+14 (ohms/cm)
Shore A Hardness Soft to medium, 65 g Flexibility Flexible, Resilient
Light Refractive Index (RI) High Specific Gravity 0.970 Test Method
Shelf Life Details Shelf life from date of manufacture for material in the original, unopened container, stored at less than 35°C, unless otherwise noted.;Storage conditions and shelf life (“Use By” date) are indicated on the product label. Shelf Life Type from date of manufacture Shelf Life (mon) 15
Best Practices for Dow SE 1885 M Kit
Some gels are supplied in bladder packs that avoid direct air contact with the liquid gel components, allowing use of air pressure over the pack in a pressure pot for dispensing. Do not apply air pressure directly to the liquid gel surface (without the bladder pack) as the gel can become supersaturated with air and bubbling can occur when the material is dispensed and cured. Use of bladder packs prevents bubbling, maintains cleanliness and avoids gel contamination. In general, gels are supplied as two-part products that are mixed in a 1:1 ratio (Parts A and B)
one-part gels are available that eliminate the need for mixing. Gels can be dispensed manually or by using one of the available types of meter mix equipment. Typically, the two components are of matched viscosities and are readily mixed with static or dynamic mixers, with automated meter-mix normally used for high volume processes. For low-volume applications, manual weighing and simple hand mixing may be appropriate. Inaccurate proportioning or inadequate mixing may cause localized or widespread problems affecting the gel properties or cure characteristics. If possible, the potential for entrapment and incorporation of gas (typically air) should be considered during design of the part and selection of a process to mix and dispense the gel. This is especially important with higher-viscosity and faster-curing gels. Degassing at >28 inches (10-20 mm) Hg vacuum may be necessary to ensure a void-free, protective layer.
If a substrate or material is questionable with respect to potentially causing inhibition of cure, a small-scale compatibility test should be run to ascertain suitability in a given application. The presence of liquid or uncured product at the interface between the questionable substrate and the cured gel indicates incompatibility and inhibition of cure. In certain situations, toughened gels may appear fully cured but have reduced or no adhesion. This may result from slight inhibition at the interface.
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