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Extreme weather poses a hidden threat to the security of a garage door. Blizzard conditions, heat waves, coastal salt spray, and torrential rain all threaten locks in unique ways, with freezing conditions binding the moving parts, heat degrading the lubricants, salt eating away at the metal, and water seeping in to wash out protective measures. Standard locks, it seems, can only survive a few months in such conditions. The good news is that the best heavy-duty garage door locks are specifically designed to operate flawlessly through the entire range of weather-related abuses that a lock could possibly encounter. This article examines four different weather conditions and how these heavy-duty locks are designed to cope.
Sub-Zero Performance: Preventing Freeze-Up and Brittle Failure
When temperatures plunge below freezing point, any moisture inside the lock mechanism solidifies into ice and freezes to the moving parts, immobilizing them. Lubricants used in ordinary locks thicken to a sludge or even solid block, and the metal itself becomes brittle. If a lock freezes solid, it cannot be opened with a key. Worse still, it may become impossible to lock it at all.
MeiGu Lock Industry Co., Ltd. of WenZhou have developed a unique combination of synthetic compounds used in their cold-weather heavy-duty locks. Both cylinder and swing handle mechanisms have used a specific type of synthetic antifreeze lubricants that are effective down to minus 40 degrees centigrade, preventing viscous seize-up of moving parts. Sealing is provided by a cold-flexible silicone, rather than the standard neoprene that solidifies below freezing, thus preventing any ingress of moisture into the mechanism. Every cylinder lock is equipped with a spring loaded dust shutter mechanism that creates a physical barrier to snow and ice. If temperatures were extremely severe MeiGu would even be able to provide high-temperature (but good in cold) padlocks that will run just as effectively in freezing weather, using graphite-based dry lubricant (effectively non-freezing), if such extreme conditions were to occur. With such a lock designed for use below zero, you would not struggle turning the key or operating the bolt.
High-Heat Resistance: Maintaining Integrity Under Thermal Stress
At the opposite end of the weather spectrum, high temperatures have different damaging effects on locks. Standard greases may bake down into solid residue and begin evaporating, causing sticking and increasing wear on the internal parts of the lock. Seals, for instance, may turn soft and lose their ability to seal properly. Metal parts may expand and bind in their housing. This is particularly true in hot environments such as those found in a desert, foundry, or even an uninsulated metal warehouse where internal temperatures can climb well over 50 °C in the summer.
High-heat tests are conducted on heavy-duty locks built by MeiGu. For high-temperature padlocks, there is continuous use at temperatures as high as 300 °C, and these locks use molybdenum disulfide or graphite-based lubricants. The zinc/aluminum die-cast housings have good integrity even up to 150 °C. If there are stainless steel components in the lock (grades 304 or 316), there is even more temperature resistance, and in any case, will not lose hardness even at higher temperatures. Seals designed for high-heat operations are made from fluoroelastomers (Viton is often used, which is rated up to 200 °C). In this particular instance, clearance tolerance are set so that the lock will not bind up when temperature increases from 20 °C to 80 °C. Any heavy-duty lock designed for use in the desert or next to a furnace must have its materials and lubricants specified so that it functions under the appropriate conditions.
Salt Spray and Corrosion Resistance for Coastal and Road-Salt Environments
Corrosion is a widespread cause of failure in locks. For instance, salt spray in coastal areas deposits itself on every surface of the lock mechanism and eventually finds its way into the moving parts. If you live where road salts are sprayed on the roads in wintertime, it stands to reason that spray from vehicles will impact the lock. Both conditions can lead to rust, pits, and seizing over the years. Standard components made of zinc or plain steel may show signs of corrosion within just weeks.
When you get down to the nitty-gritty, MeiGu is addressing corrosion primarily with material selection and surface treatments. All load-bearing components like the latch bolt, strike plate, hinge pins, and locking rods are typically made from 316 stainless steel forgings. The high level of molybdenum within 316 stainless steel gives it significant resistance to chlorides and pitting. If you have any die-cast components (such as the housings and handles) on a MeiGu lock, they use a controlled zinc/aluminum alloy. This component is then treated with a multi-layer plating process consisting of copper plating strike, nickel barrier coating, and finally e-coat or epoxy topcoat. The entire system will then pass salt spray testing in excess of 500 hours, and can achieve IP65 rating protection against spray.
Driving Rain and Flood Resistance: Sealing Against Water Ingress
Driving rain and flood conditions will quickly deteriorate many types of locks. They are designed to resist some weather but not necessarily to stand up to a direct onslaught of water. Water will corrode metals and wash away lubricants; when the water freezes, there will be freeze/thaw damage. For any type of electronic smart lock, water can destroy delicate electronics quickly. A non-sealed lock will cease to function after the first severe storm.
MeiGu's IP65 and IP66 rated cylinders have specifically been designed for wet environments. A lock rated this way will have several layers of protection to keep water out. First, it has O-rings that surround any shaft entering the lock housing (such as through the keyway or the handle shaft). Second, there is typically a silicone gasket that is pressed between the mounting flange and the surface of the door. Finally, for swing handle systems, there will usually be rubber boots around the areas where the rods exit the lock housing. The keyway itself is designed with a spring-loaded dust shutter. For applications demanding a high level of protection from the elements such as a washdown facility or off-shore platform, meiGu also has available IP67 and IP69K locks which are designed for temporary submergence or a high-pressure wash-down respectively. In addition, all electronics on smart locks are fully potted and the battery housings are sealed against moisture entry. In any given extreme weather event such as a driving rain storm or even when a lock is under a high pressure wash-down, a properly IP-rated lock is a reliable security mechanism.
Conclusion
Heavy-duty garage door locks withstand extreme weather with a specialized design that utilizes synthetic, freeze-resistant lubrication and cold-flexible seals for extreme cold; high-temperature, non-carbonizing lubricants and controlled clearance tolerances for high heat; 316 stainless steel and multi-layer plating for salt spray; and IP-rated multi-barrier sealing for driving rain and flood protection. For 15+ years and across a 5,000 square foot manufacturing base, WenZhou MeiGu Lock Industry Co., Ltd. has been designing and building the heavy-duty garage door locks necessary to protect doors against any type of weather. Whether it’s for an IP65-rated cylinder lock that must stand up to coastal weather or a high-temperature lock for access doors near furnaces, or a 316 stainless steel rod control swing handle for use in a location that sees a lot of different conditions, MeiGu can provide your heavy-duty lock at www.meiguLock.com.