Gear reducers, motor flanges, and bearing housings keep a conveyor line moving, and every one of those joints spends its working life absorbing the low-frequency vibration that belts and rollers constantly transmit back into the frame.
The Sealing Challenge
Conveyor drive flanges endure sustained heavy loads, constant low-frequency vibration, significant thermal cycling, and exposure to hot lubricating oils. A seal failure anywhere in that chain means immediate downtime and an unplanned cleanup on a line that was supposed to keep running.
The vibration profile of a conveyor drive is relentless rather than occasional, so the sealant has to keep absorbing shock indefinitely, not just survive the first few thousand cycles.
Choosing the Right Anaerobic Sealant Chemistry
A flexible, general-purpose anaerobic sealant is formulated specifically for this kind of continuous dynamic stress. Its elastomeric cured state absorbs the constant vibration and minor shock transmitted through the drive framework, which prevents the fatigue cracking a more rigid chemistry would eventually show. It also fills the wider gaps and rougher surfaces typical of large cast iron or fabricated steel drive housings — up to roughly 0.5 mm — and resists hot gearbox oil, hydraulic fluid, and common cleaning agents over years of service. Because it replaces a compressible cut gasket entirely, it also keeps the gear train’s internal alignment consistent, which extends bearing life.
Getting the chemistry right also means accounting for how CTE mismatch drives adhesive bond failure between dissimilar metals in the joint, since a housing and its cover rarely share the same coefficient of thermal expansion — a mismatch that shows up as recurring seal failure long before anyone suspects the sealant itself. For a chemistry recommendation specific to your equipment’s materials and operating envelope, Email Us to reach our applications team.
Application Steps for a Reliable Seal
- Preparation: Remove every trace of old sealant, gaskets, oil, and dust from both flange surfaces with a strong degreasing solvent, then confirm the metal is clean and dry.
- Application: Apply a continuous, uniform bead around the flange, circling all bolt holes and component edges, and spread it into a thin film with a spatula.
- Assembly: Mate the components within about five minutes and torque the bolts to the manufacturer’s specified procedure and value.
- Curing: Allow a full 24 hours before powering the conveyor drive or adding oil, so the sealant reaches its maximum resistance and strength.
Avoiding the Most Common Field Failures
Most field failures on a flexible anaerobic seal trace back to two causes: an over-thick bead, which slows the cure and leaves a soft, uncured core prone to blowout under vibration, or reusing a flange that still carries trace oil film from a previous seal. Since anaerobic chemistry cures by contact with active metal ions and the absence of air, even a light film of residual oil can leave sections of the conveyor drive flange under-cured.
Common Questions About This Application
Q: Is a cut gasket ever preferable to an anaerobic sealant here?
A: For a conveyor drive flange with wide, uneven, or previously damaged surfaces, a thicker gap-filling gasket can sometimes be justified, but it trades away the vibration resistance and long-term chemical stability an anaerobic sealant provides.
Q: Does the sealant need a chemical activator to cure properly?
A: On most ferrous and previously-sealed surfaces, ambient metal ions are sufficient to trigger the cure. A primer is worth adding only when the conveyor drive flange surface is unusually inert or was recently passivated.
Q: How thick should the bead be on a large, uneven flange?
A: Thick enough to bridge the widest gap on the conveyor drive flange, but no thicker — an oversized bead slows the cure disproportionately and increases the risk of squeeze-out into the fluid cavity.
Storage and Handling
Anaerobic sealants have a finite shelf life even unopened, since the same oxygen exposure that keeps them liquid in the bottle also slowly degrades the cure package over many months. Store cartridges upright, capped tightly, and away from direct heat or sunlight, and avoid letting the dispensing tip contact bare metal between uses — contamination at the nozzle is a common, avoidable cause of a partial cure on the next application to a conveyor drive flange.
Keeping the Seal Reliable Long-Term
Unscheduled conveyor downtime cascades into every process line downstream of it, which is exactly why the flange seal on a gear reducer deserves more thought than an afterthought gasket. A vibration-tolerant, gap-filling anaerobic chemistry keeps throughput steady instead of gambling on the next shutdown. For a closer look at related bonding chemistry, see which UV glue cures faster for quick repairs.
If your application calls for a sealant engineered to a specific pressure, temperature, or chemical-resistance profile, Contact Our Team to discuss the right formulation for your equipment.
Visit www.incurelab.com for more information.