This is the tape we use in our own picture framing shop to seal the back of pictures.
Product features
Conforms easily,
Aggresive adhesion,
Helps provide a moisture-proof seal,
Hand tearable – no dispenser required.

Product Specifications
Adhesive: – Rubber,
Colour: – Brown,
Width: – 48mm,
Thickness: – .15mm,
Backing: – Silicone Coated Kraft Paper.
Tensile Strength: – 6kg per cm.
Temperature resistance: – 60Deg.C