The Andersen Company No. 4210 Hog Heaven III Linkable Middle is a static-dissipative mat that has a top surface made from solid 20% recycled nitrile rubber, which provides excellent chemical and oil resistance. This closed-cell nitrile rubber surface is molded to the cushion backing and not glued, which means it will not delaminate over time and will provide long lasting comfort. This surface will also remain flexible over the life of the product and will not curl or crack. The Hog Heaven II mat features outstanding anti-fatigue qualities, is certified slip-resistant by the National Floor Safety Institute, and recommended for a variety of applications in distribution, manufacturing and retail environments. This mat is also welding safe.