Thermal Management Compounds
Matwerkz Thermorphous Type R
A thermally conductive potting compound developed to dissipate heat from batteries in normal use — then transform into an excellent thermal insulator above 120 °C to protect adjacent cells during a thermal runaway.
What it is
Thermorphous Type R is a thermally conductive potting compound developed to dissipate heat from batteries within their working temperature range (20-70 °C). Should the battery overheat above 120 °C, Type R transforms into an excellent thermal insulation to prevent high temperature from affecting adjacent cells in the module, and can withstand up to 1000 °C should the incident escalate into a thermal runaway. Low viscosity lets it flow into crevices and tight cavities to fully embed electronic circuits and battery assemblies; it is also available in sheet form that can be die-cut or molded — including as thermal-runaway barriers and fire-resistant seals in door panels.
Key features
Dual-mode
Thermally conductive (> 1 W/m·K) below 80 °C; transforms into thermal insulation from 120 °C.
Withstands 1000 °C
Non-flammable; protects adjacent cells in a thermal runaway.
Volume-expandable grades
Expand by up to 100 vol% to seal gaps and insulate heat in a fire.
Waterproofing & impact
Provides waterproofing plus impact resistance and shock dampening.
Electrically insulative
Pottable directly onto electronic circuits and battery cells.
Tunable hardness
Hardness and compressibility variable between 40 and 80 Shore A.
Available grades
Potting grade
Flows and fills gaps
Cures at room temperature; high electrical resistivity to encapsulate circuits and cells; water and dust protection.
Sheet grade
Flexible, compressible sheet
Can be laminated with other materials for better mechanical performance; optional double-sided tape; excellent fire-penetration resistance.
Key specifications (potting grade)
- Type: Silicone-based thermally conductive potting compound
- Specific gravity: 2.2-2.5 g/cm³
- Thermal conductivity (20-80 °C): 1.0-2.0 W/m·K
- Phase transformation: 120-150 °C (conductive → insulative)
- Conductivity after change (>120 °C): 0.10-0.30 W/m·K
- Electrical resistivity: > 10⁶ @ 1000 V
- Viscosity (before cure): 1,000-5,000 mPa·s
- Expansion after transformation: ~10-20 % (up to 100 vol% for expandable grades)
- Hardness: 40-80 Shore A
- Flame retardancy: UL94 V0
- Curing: Room-temperature and high-temperature curing grades
- Application: Potting / dipping / coating
Applications
Battery holders & lining
Initially conductive — ideal for battery holder and lining applications.
PCB & circuit potting
Fire protection, waterproofing and shock dampening for intricate circuit boards and battery modules.
Thermal-runaway barriers
Die-cut or molded sheets as barriers in battery modules.
Fire-resistant seals
Sheet form as fire-resistant seals in door panels; acoustic dampening.
Request the Type R datasheet
Tell us your cell format, thermal targets and whether you need potting or sheet form. We will recommend a grade and send the TDS.