| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester film excellent in heat resistance, pressure resistance and tolerance to R32 and used for an application containing R32.SOLUTION: There is provided a polyester film used for an application contacting R32 satisfying following (1) to (3). (1) Strength retention rate when retaining under 140°C 0% RH for 2000 hours is 30% or more. (2) Elongation retention rate when conducting pressure resistant test (repeating test with release pressure-application pressure of 10 MPa) is 50% or more. (3) Weight change rate when impregnated into a refrigerator oil under R32 atmosphere at 80°C for 200 hours is -0.3 to 1 mass%.SELECTED DRAWING: None |
