The type of UV light used is almost always Long-Wave UV-A, with a wavelength of 365 nm.
Here's a detailed breakdown of why this is used and how it works:
1. For Inspecting and Verifying Glue Application (Most Common Use)
This is for seeing where glue has been applied, checking for gaps, or finding glue stains.
Wavelength: 365 nm (UV-A)
Why it works: Most shoe glues (especially cyanoacrylates like "super glue" and certain epoxies and specialty adhesives) contain fluorescent agents. These agents absorb invisible ultraviolet light and re-emit it as visible light, causing the glue to glow brightly.
What you see: Under a 365 nm UV light, the glue will typically glow a bright blue-white or greenish color, making it stand out clearly against the shoe material.
This is useful for:
Quality Control: Ensuring a complete and even layer of glue has been applied before assembling parts of the shoe.
Leak and Stain Detection: Finding unwanted glue smears or spills that are invisible under normal light.
Repair Work: Seeing the exact extent of an existing glue line when fixing a shoe.
2. For Curing UV-Activated Glue
Some modern adhesives are specifically designed to harden (cure) when exposed to UV light.
Wavelength: 365 nm to 405 nm (UV-A to visible violet)
Why it works: These glues contain photo-initiators that are activated by a specific energy level of UV light. 365 nm is a very common and effective wavelength for triggering this reaction and hardening the glue quickly and firmly.
Important Note: A high-intensity UV lamp is needed for curing, not just a small inspection flashlight. The light must provide enough energy (in mW/cm²) to fully penetrate and harden the glue.
>. Watt: 12W
>. Input voltage:220-240V AC
>. Color temperature:365nm UV
>. LED Chips: Epistar SMD2835
>. Beam angle:180degree
>. Materials:Aluminum Alloy+PC Cover
>. With EU plug cable
>. Lifespan: 50000 hours
>. Warranty: 3 years
Recommended Type of Light to Get
For the purpose of detecting and inspecting glue, you should look for:
A 365 nm UV LED Flashlight.
Why a dedicated 365 nm light? While "blacklights" (which are often 395 nm) can work, 365 nm is superior. It causes less visible purple light and makes the fluorescent glow of the glue appear much brighter and more defined, with less background interference.
For detecting where shoe glue has been applied, a standard 365 nm UV-A flashlight is the perfect tool. It will make most common shoe glues fluoresce brightly, allowing for easy visual inspection. you can see more information on https://www.benweilight.com/professional-lighting/uv-lighting/detection-uv-light/365nm-12w-industrial-uv-inspection-lamp-clip.html
