Product Specifications: PC2031AB



Tough-Seal 31 is a tough and durable fast gelling Potting Compound and Sealant with excellent Thermal Cycling Stability. This low viscosity material is self-leveling and flows like maple syrup around intricate electrical components to ensure complete coverage of your entire PCB or electronic assembly.


Tough-Seal 31 has a faster 10-20 minute working time and a Shore Hardness of 37A, which is similar to the hardness of a pencil eraser. Tough-Seal 31 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 400% when fully cured, Tough-Seal 31 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 (MSDS) Downloads

TDS (PC2031AB)

SDS (PC2031A)
SDS (PC2031B)

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

(Typical Properties)
Physical Properties
Color, Part A Off White
Viscosityat 25°C, cP, Part A, (RVT #5, 20 RPM) 3,500
Specific Gravityat 25°C, Part A 1.15
Densityat 25°C, lbs/gal, Part A 9.6
Color, Part B Black
Viscosityat 25°C, cP, Part B,
(RVT #5, 20 RPM)
Specific Gravity
at 25°C, Part B
Densityat 25°C, lbs/gal, Part B 8.5
Color, Mix Grey / Black
Viscosityat 25°C, cP, Mix, (RVT #5, 20 RPM) 5,000
Specific Gravityat 25°C, Mix 1.07
Densityat 25°C, lbs/gal, Mix 8.9
Mix Ratio by Volume 1A to 2B
Mix Ratio by Weight 57A to 100B
Gel Timeat 25°C, Minutes, 100 grams 10
Shelf Life, Ambient, Part A Bulk (15°C to 35°C) 3 Months
Shelf Life, Ambient, Part B Bulk (15°C to 35°C) 12 Months
Shelf Life, Cold, Part A Bulk (-18°C to 3°C) 12 Months
Shelf Life,Cold, Part B Bulk (-18°C to 3°C) 12 Months
Electrical & Thermal Properties
Dielectric Strength, 25°C, Volts/mil 325
Volume Resistivity,25°C, Ohm-cm x (10)12 2.10
Dielectric Constant,25°C – 1 MHz 4.75
Dielectric Constant,25°C – 1 kHz 5.20
Dielectric Constant,25°C – 60 Hz 5.35
Dissipation Factor, 25°C – 1 MHz 0.024
Dissipation Factor, 25°C – 1 kHz 0.021
Dissipation Factor, 25°C – 60 Hz 0.044
Heat CapacityCp, 25°C, J/g°K 1.75
Thermal Conductivity,25°C, W/m°K 0.18
Coefficient of Thermal Expansion, ppm/ °C
(-) 65°C to 75°C 168
75°C to 100°C 168
100°C to 150°C 168
Coefficient of Thermal Expansion, ppm/°F
(-) 85°F to 167°F 93
167°F to 212°F 93
212°F to 302°F 93
Hardness vs Temperature
seechart (-75°C / -103°F) 87 A
(-25°C / -13°F) 50 A
5°C / 41°F 44 A
25°C / 77°F 37 A
50°C / 122°F 37 A
66°C / 150°F 37 A
80°C / 176°F 37 A
100°C / 212°F 37 A
120°C / 248°F 35 A
150°C / 302°F 33 A
Hardness vs Ambient Cure Time
seechart 1 hour 4 A
2 hours 6 A
4 hours 11 A
8 hours 14 A
12 hours 14 A
1 day 16 A
2 day 19 A
3 days 22 A
4 days 23 A
1 week 30 A
1 month 41 A
Mechanical Properties
Tensile Strengthper ASTM D638, 25°C, PSI 800
Elongationper ASTM D638, Type I, 0.125 in, 25°C 400%
Co=Cohesive Ad=Adhesive
Tensile Lap Shear Strengthper ASTM D1002, 25°C, psi **
metallica Aluminum Bare 470 Co
Steel Bare 260 Ad
Steel Ground 280 Ad
Primed Steel 150 Ad
Galvanized Steel 260 Ad
Tin Plated Steel 250 Co
Chrome Plated Steel 250 Co
Tensile Lap Shear Strengthper ASTM D3163, 25°C, psi **
frp_text FRP – Polyester Fiberglass 180 Ad
Garolite G-9 Melamine/Glass 130 Ad
Garolite G-10 Epoxy/Glass 130 Ad
Garolite XX Phenolic/Paper 190 Ad
Tensile Lap Shear Strengthper ASTM D3163, 25°C, psi **
Thermoplastics_text Acrylic 110 Ad
Acrylic/PVC 120 Ad
PVC – Polyvinyl Chloride 150 Ad
CPVC – Chlorinated PVC 170 Ad
ABS – Acylonitrile Butadiene Styrene 120 Ad
PETG – Polyethylene Terephthalate 100 Ad
Lexan – Polycarbonate 90 Ad
Nylon 6/6 – Polyamide 160 Ad
Polypropylene 40 Ad
Polyethylene LDPE 10 Ad
Polyethylene HDPE 40 Ad
Teflon PTFE – Polytetrafluoroethylene 20 Ad
Noryl – Polyphenylene Oxide/Polystyrene 170 Ad
Ultem – Polyetherimide 100 Ad
**20 mil Bondline, 1 in x 4 in Adherands, 1 in Overlap