Conrad aluminium foil tapes 25mm 100mm conrad h21130c18 this aluminium foil tape 75mm x 20m from conrad is a commercial grade 90u foil tape manufactured to protect against moisture vapor and condensation tough and durable it can be used for a range of tasks and projects such as sealing joints or seams against moisture and vapor on foil jacketing insulation conrad h21130c18 aluminium foil tape 75mm x 20m