H.B. Fuller EV Protect 300

H.B. Fuller EV Protect 300 is a two-component, low viscosity polyurethane encapsulating system that is designed for potting and encapsulating of battery cells in battery modules. This product offers battery designers the ability to enhance safety and protection from thermal propagation.

Product Type2K (2 component) Adhesive, Encapsulant

Application AreaBatteries, Battery Cells, Electric Vehicle (EV)

Chemical FamilyPolyurethanes (PU)

FeaturesExcellent Flow Properties, Fast Curing, Flame Retardant, Highly Flexible, Low Viscosity, Room Temperature Curing, Soft

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Typical Features & Benefits
  • Flame retardancy meets requirements of UL94 Flammability of Plastic Materials Vertical
  • Burn Test Rating V-0

Applications & Uses

Cure Profile

Full room temperature cure is achieved within 2-4 days and may be expeditated with an oven cure.

Mixing Information
  • Use suitable 2-part metering and mixing equipment. The A-component settles over time and requires mixing before use.
  • Blend ratio is 4:1


Physical Form
Component A
ValueUnitsTest Method / Conditions
Viscosity ( at 25°C)2500cPsBrookfield RV
Density11.2lb-mass/galASTM 0792
Physical Properties
ValueUnitsTest Method / Conditions
Hardness60.0Shore AASTM D-2240
Glass Transition Temperature22.0°CTMA
Thermal Conductivity0.512W/m-K
Coefficient of Thermal Expansion (Alpha 1)73μ/m/°CTMA
Coefficient of Thermal Expansion (Alpha 2)235μ/m/°CTMA
Component B
ValueUnitsTest Method / Conditions
Viscosity (at 25°C)1000cPsBrookfield RV
Density10.1lb-mass/galASTM 0792
Typical Properties
ValueUnitsTest Method / Conditions
ComponentsPolyol and isocyanate
CuringRoom temperature
ConsistencyLow viscosity liquid
Cured Properties
ValueUnitsTest Method / Conditions
Young's Modulus2.2MpaASTM D638
Tensile Strength (at Break)9.1MpaASTM D638
Elongation at Break147.6%ASTM D638
Uncured Properties
ValueUnitsTest Method / Conditions
Viscosity (Blend, at 25°C)2000cPsBrookfield
Blend Ratio (by volume)100:27.8
Blend Ratio (by weight)100:25
Density (Blend)11.0lb-mass/galASTM 0792
Gel Time (at 25°C)9minutes

Packaging & Availability

Regional Availability
  • Africa
  • Asia Pacific (Excluding Russia)
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America

Storage & Handling

Shelf Life
180 Days (Component B), 365 Days (Component A)
Storage and Shelf Life

Components should be stored in a cool, dry area. The B-component should be kept in a tightly sealed container flushed with nitrogen.