*This article is about one of the sodium polyacrylate’s applications – water blocking material in waterproof tape and waterproof ointment (in cable).
Sodium polyacrylate is an absorbent material that can absorb & block water up to hundreds of times of its own weight.
Sodium polyacrylate is a highly coveted product as far as the manufacture of water-proof tapes and ointments for all sorts of cables are concerned; even, optical fiber cables use it.
1. Strong expanding capability
Once the outer layer of cable was broken, sodium polyacrylate would quickly absorb water and be expanding (to block water). This process will protect the conductor in cables from moisture.
So the expanding capability is the most important point of sodium polyacrylate for cables.
2. Smaller particle size
In general, the smaller particles of sodium polyacrylate bring a faster absorbing rate.
Sodium polyacrylate's particle size can be 10-200 mesh. And cable type should be more than 50 mesh.