What is Tough-Seal ?
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Easy to Mix Potting Compounds
Tough-Seal is a sealant for potting electrical and electronic components when premium thermal cycling performance is required. It delivers low embedment stress upon cure and during thermal cycle exposures. The inherent resilience of Tough-Seal is more gentle on sensitive circuitry than hard epoxy potting compounds while at the same time providing an exceptional encapsulating shield to protect the electronic components from the environment better than the weaker urethanes.
Electrical Component Sealants
Tough-Seal is a family of easy to mix, two component, hybrid epoxy elastomer potting compounds that do not contain isocyanates. It has a milder health and safety profile than urethane encapsulants. Tough-Seal is a lower cost option to silicones.
Durable and firm Encapsulating Polymer
 Tough-Seal is provided in a convenient mix ratio that is easy to mix. It sets at room temperature to form a durable and firm encapsulating polymer with exceptional flexibility from minus (-)75°F with elevated temperature resistance up to 300°F. As an epoxy, Tough-Seal picks up where urethane encapsulants drop off, while its tough, rubbery nature delivers thermal cycling performance not typically found in epoxy potting compound materials in order to protect and encapsulate the electrical and electronic components from the environment.
Which Tough-Seal Potting Compounds are Right for Me?
Tough-Seal is an entire family of potting compounds with excellent thermal cycling characteristics. There are four variations to suit your individual application requirements.
While all Tough-Seal is elastomeric, they largely differ on the basis of cured hardness, working life and flow.
We Can Help You to Pick a Potting Compound
Contact Tough-Seal Tech Service
1 888 KEY POLY
tough-seal@keypolymer.com
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Click on a colored boxes to check out the Physical Properties of each Tough-Seal.
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| The Selections: Spelled Out |
Tough-Seal 21 flows very well around electrical components but it has a higher viscosity to help prevent it from flowing out of small gaps in the part. When fully cured Tough-Seal 21 has an ambient Shore A hardness in the mid-sixties and it has high elongation. Tough-Seal 21 has a faster 15 to 20 minute gel time for improved productivity if you need the encapsulant gelled before down stream assembly. Because of the faster reactivity, the shelf life of Tough-Seal 21 Part A is shortened to preserve the fast set.
Tough-Seal 22 flows very well around electrical components but like Tough-Seal 21, it has a higher viscosity to help prevent it from flowing out of small gaps in the part. When fully cured Tough-Seal 22 has a Shore A hardness in the upper-sixties at room temperature coupled with high elongation. Tough-Seal 22 has a longer one hour gel time and as such a longer working life before it sets up. Mild heating can be used to hasten the set time and cure as an option. The shelf life of both the A and B parts of Tough-Seal 22 is 12 months at ambient for more convenient inventory management in a global supply chain.
Tough-Seal 31 has lower mixed viscosity than Tough-Seal 21 to increase flow around intricate electrical components. When fully cured, Tough-Seal 31 has a Shore A hardness in the upper-thirties at room temperature and the highest elongation percentage. Tough-Seal 31 sets up quick in 15 to 20 minutes. Because of the faster reactivity, the shelf life of Tough-Seal 31 Part A is shortened to preserve the fast set.
Tough-Seal 32 has a lower mixed viscosity than Tough-Seal 22 when more flow is needed around more intricate electrical components. Tough-Seal 32 has a Shore A hardness in the low forties at room temperature when fully cured. Like Tough-Seal 31, Tough-Seal 32 has the highest elongation. Tough-Seal 32 has a longer one hour gel time and as such a longer working life before it sets. If useful, mild heating can be used to hasten the set time and cure. The shelf life of Tough-Seal 32 A-side and B-side is 12 months at ambient storage conditions for simplified inventory management across a global supply chain.
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