About Superabsorbent Polymer

Superabsorbent Polymer (SAP) is a material capable of absorbing several hundred to 1,000 times its own weight in water. Even when subject to pressure, this polymer securely retains the absorbed liquids. In 1978, we were the first in the world to begin commercial production of SAP. Today, SAP is used in a wide range of applications, from hygiene materials used mainly in disposable diapers and sanitary products to non-hygienic applications such as agriculture & horticulture, pet, construction and civil engineering, etc.

Mechanism of absorption

SAP are crosslinked networks of flexible polymer chains. The polymer chains are shrunk befor absorbing water. When water comes into contact polymer chains, these chains are expanded. Water is trapped tightly within networks.


Fields Uses
Hygiene products Disposable diapers, Napkins
Agriculture & Horticulture Water holding agent for soil, Water holding sheet for seedbed of rice
Food & Transportation Ice pack
Convenience Goods Disposable hand-warmer, Air freshener
Pet Dog sheet
Medical Medical liquid solidifier


SDP Global, a subsidiary of Sanyo Chemical, is the world leading manufacturer specialized in SAP, and SANWET is SDP Global’s brand with more than 40 years experience.
SANWET has more than 20 types of SAP that match various customers’ needs.

SANWET is supported by three core technologies

We work on improvement of core technologies and application development.

Our recent main award-winning technologies

Award by Society of Iodine Science in 2018
Award by Society of Polymer Science Japan in 2019