How to store Hydroxypropyl Methyl Cellulose

Like all fine-particle organic substances, cellulose ethers constitute a dust explosion hazard. Dust formation and deposits must be kept to a minimum so that no ignitable dust/air mixtures can form. Ignition sources such as naked flames, hot surfaces, sparks and static electricity should be avoided. Welldone cellulose starts to decompose at about 200°C. Its ignition temperature is >360°C. Welldone cellulose burns easily and the fire may spread. 
When stored in closed containers, or in its original packaging in a dry place at room temperature, Welldone cellulose can be kept for a long time. In the case of high viscosity grades, a slow loss of viscosity can be measured after lengthy storage (>1 year). Welldone cellulose absorbs water from moist air. Once opened, container must be resealed and kept tightly closed. 
This Welldone cellulose-type is supplied in multi-ply paper bags with polyethylene intermediate layer and/or in big bags.