| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the occurrence of a fracture in a bending part and preclude deterioration due to weathering phenomenon found in an ultrafine glass fiber by increasing durability and preventing deterioration of a separator for a sealed lead-acid battery. SOLUTION: The separator for a sealed lead-acid battery contains, as a main body, glass composition including, by mass%, SiO2 of 63.0-66.0, Al2O3 of 4.0-5.1, B2O3 of 5.5-7.5, Na2O+K2O of 14.6-18.2, MgO of 2.7-3.7, CaO of 3.7-5.3, BaO of 0-0.3, and 0-0.2 others, which constitutes an ultrafine glass fiber. |
