ゴムコンパウンドには実際に何が含まれているのか

Most buyers receive a formula as a list of abbreviations with numbers after them and no explanation. That makes it impossible to judge whether a quote is comparable to another one, or to spot a substitution that will change how the part behaves in service.

The six families

• •Polymer — the base elastomer: NR, SBR, BR, EPDM, NBR, CR. It sets the ceiling for most properties.
• •Fillers — carbon black or silica. They raise strength, tear resistance and abrasion resistance, and they are usually the largest cost lever in the whole compound.
• •Cure system — sulphur (or peroxide), accelerators, activators such as zinc oxide and stearic acid. This decides how fast and how densely the rubber crosslinks.
• •Antidegradants — antiozonants and antioxidants such as 6PPD and TMQ. They slow down cracking, hardening and flex fatigue.
• •Processing aids — oils, resins, dispersing agents, release agents. They control viscosity, tack and how the compound flows in the mould.
• •Special ingredients — coupling agents, adhesion promoters, blowing agents, colourants, flame retardants.

Why the buyer should care

Two compounds can both be described as "NBR 70 Shore A" and behave completely differently in oil, heat or compression set. When you request a quote, ask for the polymer grade, the filler type and loading, the cure system and the antidegradant package — those four items explain most of the price difference you will see between suppliers. ## Need the documents or today's price? Send us the grade, quantity and destination port — we return a quotation with COA and MSDS attached. Email manager@fipolymer.com or use the inquiry form on this site.