Tsoft3ST-120 Thermally Conductive Material Gap Filler
Brady Tsoft3ST-120 is a thermally conductive material gap filler with green color, silicone binder, aluminum oxide filler, thickness of 120 mil (3.0 mm), and halogen-free compliance.
Standardized laboratory test data measured in accordance with ASTM D 1000, ASTM D 2979, and ASTM D 2671.
Physical Property
Test Method
Standard Test Units (US)
Metric Units (SI)
Total Thickness
ASTM D 1000
120 mils (0.00120 in)
3.048 mm
Thermal Transfer Ribbon Compatibility
Official Brady recommended ribbons engineered for maximum contrast, smear resistance, and UL certification compliance.
Recommended Thermal Transfer
Non-printable hardware, tag, or pre-printed material.
* Note: Testing print permanence with official Brady ribbons is required to maintain UL/CSA agency certification on printed labels.
Chemical & Solvent Resistance Matrix
Standardized dip and rub immersion test observations across industrial fuels, oils, solvents, and cleaners.
No standardized ASTM chemical dip/rub test data is published on the official Brady TDS for BT-8817.
Environmental & Aging Durability Testing
Environmental Exposure Condition
Observation & Legibility Result
120 Thermally Conductive Material Gap Filler - Material Spec (Brady BT-8817)
Material family
BT-8817
120 is a thermally conductive material gap filler with green color, silicone binder, aluminum oxide filler, thickness of 120 mil (3.0 mm), and halogen-free compliance.
## Verified specifications
- Construction
Sheet Form, Both Side Tacky
Service temperature
-40 to 150 °C
Verified Target Applications & Use Cases
Industrial rating plates, asset identification, and electrical component labeling.