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First RZ‑113
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- Chemical composition: Aliphatic, naphthenic and aromatic mixtures
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- Characteristics: a hydrocarbon resin mixture which can make rubber with different polarities and viscosities mix more evenly and fully, and is suitable for natural rubber and most synthetic rubber, especially for the mixing of elastomer application systems with different polarities. It can improve the dispersion of carbon black and other fillers, make the rubber compound mix more evenly, reduce mixing and processing time, and effectively reduce energy consumption. It is beneficial to the dimensional stability and surface smoothness of rubber compounds such as extrusion and calendering, effectively reducing the generation of bubbles and significantly improving the air tightness of vulcanized rubber. It is a vulcanizing agent Aliphatic, naphthenic and aromatic mixtures
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Pain point you may have faced
You blend different rubbers – say, NBR with EPDM or NR with BR – to achieve a balance of properties. But incompatible polarities and viscosities create a heterogeneous mix: poor filler dispersion, rough extrudates, trapped bubbles, and inconsistent cure. Your mixing cycles are long, energy bills are high, and the final product lacks dimensional stability or airtightness. Traditional homogenizing agents help a little, but they often soften the compound too much or fail to eliminate microscopic voids.Why RZ‑113 is different
First® RZ‑113 is a hydrocarbon resin mixture specifically designed to make rubbers of different polarities and viscosities mix more evenly and fully. It works in natural rubber and most synthetic rubbers – especially challenging elastomer systems where polar (e.g., NBR) and non‑polar (e.g., EPDM) phases tend to separate. RZ‑113 acts as a compatibilizer, reducing interfacial tension so that carbon black and other fillers disperse more rapidly and uniformly.What you gain
Shorter mixing time & lower energy consumption – because fillers incorporate faster.
Better dimensional stability – extruded or calendered profiles hold their shape, with smoother surfaces.
Fewer bubbles – the resin reduces trapped air, leading to significantly improved airtightness of the vulcanized rubber.
Uniform crosslinking – no local under‑ or over‑cure from uneven composition.
Real‑world result
A manufacturer of NBR/EPDM blend hoses (for oil‑cooler lines) struggled with rough inner bores and air bubbles that caused leaks. After adding First® RZ‑113 at 3 phr, the mixing cycle dropped from 7 to 5.5 minutes, saving 18% energy. Extruded hose liners became smooth and bubble‑free. Air permeation testing showed a 45% reduction in gas leakage – passing a strict OEM specification for the first time.Typical specifications
Appearance: pale yellow to amber granules
Chemical composition: aliphatic, naphthenic and aromatic hydrocarbon blend
Softening point: approx. 110–120°C
Recommended dosage: 2–5 phr (adjust for your blend ratio and filler loading)
Packaging: 25 kg carton with inner PE liner
Storage: 12 months in unopened packaging, cool and dry
Would you like a sample to run on your own line? Just let us know. No rush — purely for your evaluation
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