Die -formed graphite rings are made of low-sulphur expanded graphite without any fillers or binders.Die -formed graphite rings are compressed in precise moulding tools to the required density.
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Expanded graphite braided packing ring is made from expanded pure graphite yarn,braided into packing through all kinds of technology of braiding.
Combination packing rings consist of low-sulphur expanded graphite packing rings and die -formed graphite rings. They usually use the high carbon packing rings or nickel graphite rings as end rings and the pure graphite rings or graphite packing rings as middle rings. They can overcome weakness of a single packing ring’s sealing effect.