Dow Sylgard 528 Firm Gel Parts A & B

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Description for Dow Sylgard 528 Firm Gel Parts A & B

Firm or tough, thermal/mechanical shock and vibration damping, primerless chemical adhesion at room temperature (except 3-4237 Dielectric Firm Gel, which requires heat to develop chemical adhesion), excellent dielectric properties, flexible cure schedule, reversion resistant, thick section cure, compatible with automated dispensing equipment, and physical and electrical stability over a wide temperature range.

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Brand	Sylgard
Application Type	Seal
1 Part or 2 Part	2-Part
Material Form	Gel
Industry	Circuits, Smart Meters, E-Mobility Solutions, Smart Home Devices, Electronics, Optoelectronics
Manufacturer	Dow
Chemistry	Silicone, Solvent-free
Cure Method	Part A/Part B, Heat
Cure Temperature (°C)	20 to 25, 120
Cure Time (min)	80
Viscosity (cPs)	Low, 400
Color	Clear
High Temperature Resistance (°C)	150
Low Temperature Resistance (°C)	-45, -55
Durability	Tough
Light Refractive Index (RI)	High

Best Practices for Dow Sylgard 528 Firm Gel Parts A & B

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Technical Data for Dow Sylgard 528 Firm Gel Parts A & B

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Overview

Application Type
- Sealant - Seal
1 Part or 2 Part
- 2-Part
Material Form
- Gel
Industry
- Smart Meters
- Smart Home Devices
- E-Mobility Solutions
- Electronics - Circuits, Optoelectronics
Chemistry
- Solvent-Free
- Silicone
Application Method
- Dispenser - Automated dispensing equipment
Cure Method
- Heat
- 2-Part Cure - Part A/Part B
Color
- Clear / Transparent - Clear
Brand
- Sylgard

Specifications

Cure Specs

Cure Temperature (°C)	20 to 25, 120
Cure Time (min)	80
Viscosity (cPs)	Low, 400
Work / Pot Time (min)	360, Long	Test Method
Mix Ratio	1:1 (by volume)

Material Resistance

High Temperature Resistance (°C)	150
Low Temperature Resistance (°C)	-45, -55
Moisture/Humidity Resistance	Moisture/humidity resistance

Conductivity

Dielectric Strength (V/mil)	Excellent

Hardness

Durability	Tough
Flexibility	Firm, Resilient, Flexible

Other Properties

Light Refractive Index (RI)	High
Specific Gravity	0.970	Test Method

Business Information

Shelf Life Details	Storage conditions and shelf life (“Use By” date) are indicated on the product label.
Shelf Life Temperature (°F)	77
Shelf Life (mon)	9

Best Practices for Dow Sylgard 528 Firm Gel Parts A & B

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1. Mixing
  
  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.
2. Testing
  
  If a substrate or material is questionable with respect to potentially causing inhibition of cure, it is recommended that a small scale compatibility test 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.
Comparable Materials for Dow Sylgard 528 Firm Gel Parts A & B

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Spec Engine^® Results
- Sylgard 527 Silicone Dielectric Gel(Dow)
  Two-part, 1 to 1 mix ratio dielectric gel, Room temperature or heat accelerated cure, Available in clear or red, Low viscosity allows good flow under components, UL flammability rating
- Fluorogel Q3-6679 Dielectric Gel(Dow)
  A two-part, clear, solvent resistant gel, room temperature or heat cure, long working time, resistant to fuels.
- Dowsil EG-3000 Thixotropic Gel(Dow)
  • Two part • Translucent • 1:1 mix ratio • thixotropic gel • Heat cure gel
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