Valutek's college ruled spiral-bound notebooks are manufactured with high-density polypropylene covers, with plastic spirals, and durable cleanroom papers. The covers have an impregnated antistatic property with excellent chemical resistance. The pages are printed with IPA resistant low sodium ink, which reduces fiber and particle generation while lowering ionic contamination. Cleanroom processed and packed. All Valutek cleanroom notebooks are tested and manufactured in ISO compliant facilities under Valutek inspection and strict process control to ensure Valutek quality standard and product specifications.