| 摘要 |
PROBLEM TO BE SOLVED: To provide a phenol resin pulley which has an excellent mechanical strength and abrasion resistance. SOLUTION: A resin pulley is made of a phenol resin molding compound composed of a resol type phenol resin of 25-45 wt.%, a glass fiber of 45-65 wt.% in an inorganic fiber, a silica powder of 5-15 wt.% in an inorganic powder, for the whole of the molding material.
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