The document describes the features and characteristics of FIT®-621 products, including operating temperature range, shrinkage ratio, color description, physical properties, chemical properties, electrical properties, and applications.
FIT-621 is a heavy‑wall, adhesive‑lined heat‑shrink tubing made from irradiated polyolefin. It offers a 6:1 shrink ratio at 121 °C, low water absorption, and resistance to oils, chemicals and abrasion. The product is supplied in pre‑cut 6‑inch lengths and is RoHS compliant.
The tubing operates from –55 °C to 90 °C and features a tensile strength of 1200 psi, ultimate elongation of 200 %, and a specific gravity of 1.4. Electrical properties include a dielectric strength of 200 V/mil (79 kV/cm) and a volume resistivity of 1073 Ω·cm. It is suitable for underground utility splice protection, corrosion protection of metal parts, and other severe‑environment applications.
| Shrink Ratio | Approximately 6 to 1 at 121 °C |
|---|---|
| Operating Temperature | -55 °C to 90 °C |
| Color | Black |
| Tensile Strength | 1200 psi |
| Ultimate Elongation | 200 % |
| Longitudinal Shrinkage | -10 % |
| Specific Gravity | 1.4 |
| Water Absorption | 0.5 % |
| Dielectric Strength | 200 V/mil (79 kV/cm) |
| Volume Resistivity | 1073 Ω·cm |
| RoHS Compliance | Yes |
The FIT-621 tubing shrinks approximately 6 to 1 when heated to 121 °C.
FIT-621 can be used from –55 °C up to 90 °C.
Yes, the FIT-621 product is RoHS compliant.
The tensile strength of FIT-621 is 1200 psi.