Product Specifications: PC2042AB


Tough-Seal 42, Key’s newest addition to the Tough-Seal Product Line, is a UL 94 V-0 LISTED, tough and durable fast gelling Potting Compound and Sealant with excellent Thermal Cycling Stability.  This UL APPROVED , medium viscosity material is self-leveling and flows like chocolate syrup around electrical components to ensure complete coverage of your entire PCB or electronic assembly. (UL File#:  QMFZ2.E135297)


Tough-Seal 42 has a longer 60 minute working time and a Shore Hardness of 87A, which is similar to the hardness of the heel of a men’s dress shoe.  Tough-Seal 42 reaches 94% of its full hardness after an overnight cure or with a heat cure of 1 hour at 80°C  (176°F). Tough-Seal does not exotherm or shrink during curing, therefore there is no embedment stress induced on the electronic components that could cause damage and failure of the PCB or electronic assemblies. Sensitive electronics can be potted safely with low embedment stress Tough-Seal.


With a high elongation of 200%  when fully cured, Tough-Seal 42 maintains exceptional flexibility and thermal cycling stability from –40°C to 150°C (-40°F to 302°F) without pulling back, wilting, or cracking.  This ensures a tough seal that will stop moisture or other contaminants from damaging sensitive PCB’s and electronics.


Tough-Seal has very aggressive adhesion to aluminum, making it a perfect choice for potting aluminum housings in LED lighting applications.  Tough-seal bonds extremely well with most polymers.  For housing and wire insulation materials that are exceptionally difficult to bond to, we offer our KEY PR1200 PRIMER, an aggressive adhesive promoter that is simple to use.

Technical Data Sheet (TDS) and Safety Data Sheet (SDS) Downloads

TDS (PC2042AB)

SDS (PC2042A)
SDS (PC2042B)

TDS (Key PR1200 Primer)
SDS (Key PR1200 Primer)

(Typical Properties)