The shelf life of refractory materials refers to the valid period during which product performance, strength, and construction effect meet technical requirements under proper storage conditions. The shelf life varies by material and bonding system.
Shaped refractory products (such as refractory bricks and precast blocks) are fired at high temperatures. They have a dense structure, stable performance, and do not contain binders or additives that easily fail due to moisture. Their shelf life is relatively long—usually 1 year or more with proper storage.
Unshaped refractory materials (such as castables, gunning mixes, and ramming masses) contain binders and additives and are sensitive to humidity. Their shelf life is shorter, generally 3 to 6 months, subject to the product certificate.
Proper storage—keeping dry, ventilated, moisture-proof and rain-proof, can effectively maintains stable performance. Materials beyond the shelf life must be re-tested and approved before use to ensure safe construction and operation of kilns and furnaces.
