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    配方类型: MISCELLANEOUS
    配方说明: Eraser (Pencil)
    配方组成: Titanium Dioxide/10
    Lithopone/100
    Fina Process Oil 2059/30
    White Factice 822/100
    Zinc Oxide/10
    Vulcanizate Properties: Cure: 30 min at 150 C in stea
    Density (mg/m^3)/1.67
    Hardness, IRHD/40
    Stearic Acid/2
    Barytes/80
    Mill mixing is often preferred because of the greater control it allows.
    High factice levels can also cause occasional crumbling in internal
    Sulfur/8
    mixers unless care is taken. Mill rolls should be kept cool since high
    MBTS/1
    temperature may result in sticking. The following mix schedule has been
    found satisfactory:
    DPG/2
    Disperse the zinc oxide in the rubber. Add stearic acid, accelerators,
    sulfur, pigment, filler, and oil. Add the factice.
    Pigment/as required
    Erasers are generally either cured from calendered or milled sheet in
    simple clamped molds in a steam pan or are extruded and then steam
    cured. Press molding is also used. Molded erasers may be either
    individually molded

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