The Sengtor 50-pack features an extra-wide elastic ear-loop design, which is intended to provide a more comfortable fit behind the ears compared to thin cords. These white masks use a standard five-layer composite with melt-blown polypropylene as the core filter. The individually wrapped units are a helpful feature for keeping extras in various locations like school bags or art kits.
Specifications indicate an internal aluminum nose wire, which helps the mask maintain a clean exterior. In daily use, the nose wire can sometimes "spring back" after a couple of hours, so you may need to re-adjust the pinch to keep a good seal. The ultrasonic welds for the extra-wide loops are the primary mechanical weak point; they can fail if pulled too hard when you are first putting the mask on.
Tests show that these masks offer excellent initial breathability. However, the inner layer can retain odors during a long shift, and the outer fabric may start to pill after a few hours of wear. They are a practical choice for non-medical situations where you need a large supply of breathable, easy-to-carry masks.
If you are looking for a mask that offers a similar volume but in a professional black finish, the Levenis 50-pack in black is a popular alternative.
To see all the different types of protective gear we carry for your home projects, visit our KN95 dust masks for art and lab classes page.
