Z-Block (100) vs. Z-Block (135)


When it comes to cable protection and repair, both Z-Block® (100) and Z-Block® (135) are common choices. These two products share very similar characteristics, but there are vital differences that need to be considered to choose the right solution. In this article, we will compare and discuss the characteristics and applications of Z-Block® (100) and Z-Block® (135).


Z-Block (100) Hot Melt Adhesive Tape
Z-Block (135) Hot Melt Adhesive Tape

Z-Block® (100)

Z-Block® (100) is a polyamide, hot melt material that prevents fluid ingress and creates no corrosion of copper and aluminum metal substrates. Z-Block® (100) can be used on applications exposed to temperatures up to 212°F (100°C).

Z-Block® (135)

Z-Block® (135) is also a polyamide, hot melt material that prevents fluid ingress that has very similar characteristics and benefits to Z-Block® (100), but with a higher maximum operating temperature. Z-Block® (135) can be exposed to temperatures up to 275°F (135°C) making this solution ideal for higher temperature applications.

Shop Z-Block® (100) Shop Z-Block ® (135)



Choosing the Right Material:

Both Z-Block® options can be used to protect cables from water, oil, or grease ingress while both being compatible with polyolefin, PVC, and EVA-type heat shrink to customize an ideal solution to protect and repair your cables. Understanding your application’s maximum operating temperature is the key to choosing the best Z-Block® product.  Additionally, Z-Block® (135) tends to have a higher viscosity than Z-Block® (100) due to its higher operational temperature.  If lower viscosity and more fluid adhesive is desired, we will often suggest starting with Z-Block® (100).


Each Z-Block® option will provide a protective solution for your application with differing maximum operating temperatures. By understanding the application requirements, you can choose the right material to ensure the best performance of Zippertubing’s Z-Block® product.

McKenna Roth - Design Engineer

Written by McKenna Roth - Design Engineer