PVC Pump Tube 3tag, 72mm spacing, 0.76mm ID Black/Black (PKT 12).Tag Colors: Black/BlackID mm: 0.76Wall Thickness mm: 0.86OD mm 2.48Overall Length: 455mm (72mm spacing between tags)Number of Tubes Per Pack: 12Physical Properties: Thermoplastic, PVC based material with plasticizerMaterial: Made from Tygon R3603/R3607 or equivalent.Special Properties: Inexpensive all-around tubing for general laboratory applicationsChemical Compatibility: Excellent for aqueous solutions of the following acids and concentrations, up to 35% Nitric Acid, up to 37% Hydrochloric Acid, up to 25% Hydrofluoric Acid, up to 30% Hydrogen Peroxide. For >35% Nitric Acid and >25% Hydrofluoric Acid we recommend using Viton.Limitations: Potential leaching of plasticizersGlass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001