Whether you're sourcing a waterproof aluminum enclosure for outdoor instruments, robotics, medical devices, or industrial equipment, understanding IP ratings is critical to choosing the right protection level — and avoiding costly mistakes.
An IP rating, short for Ingress Protection, describes how well a device's enclosure limits the entry of external elements that can affect performance. Instead of focusing on function, it focuses on exposure tolerance.
Each IP rating is a two-digit number, and each digit has a specific meaning:
💡 For enclosures like aluminum electronic housings, the second digit is usually the most important — it tells you how the enclosure handles rain, splashing, or submersion.
| Feature | IP65 | IP67 | IP68 |
|---|---|---|---|
| Dust Protection | ✅ Dust-tight (6) | ✅ Dust-tight (6) | ✅ Dust-tight (6) |
| Water Protection | Low-pressure water jets | Temporary immersion up to 1m / 30 min | Continuous immersion beyond 1m (manufacturer-specified) |
| Can it be submerged? | ❌ No | ✅ Briefly | ✅ Yes (prolonged) |
| Typical Use Case | Outdoor enclosures, rain/spray environments | Marine, automotive, outdoor sensors | Underwater equipment, submersible systems |
The IP65 rating consists of two distinct protection specifications:
In order to pass IP65 testing, fixtures must withstand water projected by a 0.25-inch nozzle, including exposure to low-pressure jets and water spray from all directions. This test must run for a minimum of fifteen minutes, with the water source placed three yards from the fixture, at a pressure of 30 kPa and a water volume of 3.3 gallons per minute.
⚠️ Important:
IP65 = Water resistant — "Protected against water jets from any angle." Do NOT submerge IP65-rated devices; these are not waterproof.
Best for: Road lighting, wall-mounted outdoor enclosures, garden equipment, and any application where rain or spray is the primary concern.
IP67 maintains the same excellent dust protection as IP65 but significantly enhances water resistance. The second digit (7) is where IP67 surpasses IP65 — it adds protection against temporary immersion in water. Specifically, IP67-rated devices can withstand immersion in 1 meter of water for up to 30 minutes without damage.
Products with an IP67 waterproof rating are a preferred choice for tough and outdoor applications since they can withstand submersion in water up to one meter deep for thirty minutes without experiencing any damage.
Best for:
Choose IP67 for goods that could become submerged, such as puddle lights, sensors exposed to seawater, or rugged cellphones, if the equipment can withstand being submerged for up to 30 minutes at a depth of one meter.
An IP68-rated enclosure is designed for continuous immersion under defined conditions. Unlike IP67, IP68 does not have a fixed depth or duration — these values are specified by the manufacturer.
IP68-rated products are used in underwater equipment, exposed marine systems, and environments where standing water is part of normal operation. Proper installation and sealing are especially important at this level.
⚠️ Pro Tip:
"IP68" is a flexible standard — always ask: How deep? For how long?
Make sure your supplier specifies exact depth and duration in writing.
Best for: Submersible pumps, underwater sensors, military-grade equipment, and marine electronics exposed to prolonged water contact.
A crucial misconception is that IP67 is not necessarily "better" than IP66. IP67 tests for static immersion, while IP66 tests for high-pressure kinetic force. A fixture in a typhoon-prone coastal area, for example, needs the force resistance of IP66, not just the immersion resistance of IP67.
IP ratings are based on controlled laboratory tests. Real environments often include vibration, temperature changes, pressure variation, and chemical exposure. A higher IP rating does not compensate for poor installation or unsuitable housing materials — an IP67 enclosure installed incorrectly may fail sooner than a properly installed IP65 enclosure.
| Environment | Recommended Rating |
|---|---|
| Outdoor, exposed to rain/spray | IP65 |
| Flood-prone areas, ground-level sensors | IP67 |
| Underwater, pools, marine submersion | IP68 |
| High-pressure washdown (industrial/food) | IP69K |
The bottom line: There is no "best" rating — only the "right" rating.
At Foshan PUMAY Technology, our custom aluminum enclosures are manufactured with precision CNC machining, high-quality sealing gaskets, and rigorous quality control — enabling us to support IP65, IP67, and IP68 configurations based on your application needs.
Whether you're an R&D engineer designing a medical device, a robotics manufacturer sourcing for production, or a defense contractor requiring high-reliability enclosures, PUMAY can help you select and customize the right enclosure for your exact environment.
📩 Contact us: jessie@pumay-aluminum.com
