About Us

Diamond Chemical offers over 1500 products and services more than 2500 customers in the multi-state areas of Delaware, Pennsylvania, New Jersey and Maryland.

As the area's premier janitorial wholesale supply store and warehouse, we specialize in:

  • Green Cleaning Technology
  • Odor Control
  • Warewashing
  • Selling and Servicing Janitorial Equipment

Our mission to our Industry is to provide:

  • One on One Business Interactions
  • On-time Delivery
  • VMI, vendor management inventory
  • Best Value Products and Technology
  • Being On Call
  • On-site Personal Training

Diamond Chemical and Supply is privately owned and operated by the Ventresca Family and continues to subscribe to their operating mandate: "We refuse to Sacrifice Quality for Price. The Quality Remains long after the Price is Forgotton."
Address: 524 S. Walnut Street Plaza, Wilmington, DE 19801       Phone: (302) 656-7786       Fax: (302) 656-3039       Email:
Diamond Chemical supplies industrial cleaning supplies, commercial cleaning supplies, and janitorial supplies in the Delaware, Philadelphia & New Jersey areas.