custom compounder of plastics and rubber materials ? material science company Teknor Apex Company is an international compounder of advanced polymer materials. We offer custom and standard compounds of vinyl, thermoplastic elastomers, and engineering thermoplastics. Our colorant business formulates colors and masterbatches for use with all thermoplastics and processes. Our specialty compounding unit manufactures other thermoplastic compounds and additives on a custom or toll basis. Two other Teknor Apex businesses add vertical integration to our compounding operations: We are one of the larges