Engineering solutions in the field of
lubricants and sealants


One-part silicone rubber.


  • Applications
  • Features



DOWSIL 3-6891 One-Part Silicone Rubber Abradable Sealant Compound is a black, one-part abradable material that cures with heat to become a flexible rubber. Compared to other silicone products, it has the following unique combination of features:

• Low density
• High temperature stability
• High abradability/machinability

These features are particularly suited for the product’s use as an abradable seal and rubstrip for the compressor blades of jet engines, as well as for high-temperature thermal insulation.
The product meets United Technologies Pratt & Whitney specification PWA 36447.


DOWSIL 3-6891 One-Part Silicone Rubber Abradable Sealant Compound can be cast, troweled or injected into place using standard one-component processing equipment. A typical schedule for jet engine use cures the material for two hours at 300°F. Lower temperatures may require additional
time to reach full cure.
Стандарт Показатель Ед. изм. Значение
Внешний вид (консистенция)Паста
Предел прочности на разрывМПа4,13
Прочность на срез при соединении внахлёст (слой герметика 12,7 х 25,4 х 1 мм) на алюминии 2024МПа2,41
Относительное удлинение при разрыве%70
Твердость по Шору А75
Удельный весг/мл0,95
Модуль упругостиМПа5,9