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A few years ago, I visited a wind turbine gearbox manufacturer. Their equipment had been running for less than three months when the main shaft oil seals began to seep. We pulled one out on site, and the lip had already hardened and cracked. The cause was obvious: the wrong material. They had used standard NBR, but the gearbox ran at high speed, high temperature, and in oil with chemical additives. That combination was simply too much for the material to handle. In industries like pumps, motors, gearboxes, engines, industrial machinery, robotic arms, industrial robots, energy equipment, construction machinery, wind power, metallurgy, chemical processing, hydraulic systems, agricultural machinery, water treatment, marine vessels, high-speed rail, trains, aircraft, automobiles, and heavy trucks, the material you choose for a shaft oil seal often determines how long it lasts—and how smoothly the equipment runs. Matching Material to the Job The most expensive material isn’t necessarily the best. The right choice is the one that fits the job. · NBR (Nitrile Rubber) – Good with mineral oils, cost-effective, fine for medium- and low-temperature, moderate-pressure work, but vulnerable to heat and ozone. · FKM (Fluoroelastomer) – Handles high temperatures and aggressive chemicals, ideal for high-speed, high-heat, complex media environments like chemical pumps or turbochargers. · VMQ (Silicone Rubber) – Stays flexible in extreme cold, good for equipment facing wide temperature swings, but not the most wear-resistant. · HNBR (Hydrogenated Nitrile) – Outperforms NBR in oil, heat, and ozone resistance, suited for tough hydraulic systems and heavy-duty machinery. · PTFE (Polytetrafluoroethylene) – Low friction, excellent chemical resistance, works in high-speed, dry-running, or corrosive conditions, but the lip is fragile during installation. Beyond the medium and temperature, you have to think about pressure and surface speed. High-pressure setups demand materials with low compression set. High- speed shafts need materials that can resist wear and shed heat effectively. Installation – The Overlooked Factor I’ve seen plenty of cases where the material was right, but the seal still failed early because of how it was installed: · Shaft surfaces too rough, wearing the lip prematurely; · No guide sleeve during assembly, nicking the sealing edge; · No lubrication before startup, causing instant dry-running damage. At DEDE, our full-cycle customization service includes installation advice, and sometimes even on-site support, to help customers avoid these preventable mistakes. FAQ Q1: Can you ship standard sizes immediately? A1: Yes. We keep a wide range of O-rings and oil seals—over ten thousand specifications—in stock. Standard parts can ship the same day for urgent orders. Q2: How long for custom parts? A2: From material selection and design to production and testing, we control the whole process. Lead times are predictable, and urgent jobs can be prioritized. Q3: How do I reduce after-sales issues? A3: We recommend materials based on real operating conditions and fine-tune designs to reduce early failures. That means fewer warranty claims and happier end-users. After thirty years in this business, I’ve learned that choosing the right material for a shaft oil seal isn’t just a technical decision—it’s a business one. The right choice keeps equipment running, reduces downtime, and builds trust with customers. At DEDE, we aim to share that experience with every partner we work with, so their machines spend more time earning and less time waiting for repairs.

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DEDE SEALS

DEDE SEAL Co.,Ltd
Shanghai China
Shanghai
China

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