They are not recommended for very high value items as they can be more difficult to remove, should that ever be required. These archival quality tapes can be applied easily and form strong and barely visible repairs in most papers. That may be a work of art, book, newspaper, certificate, photograph, map, poster etc.įor simple repairs in tears in paper that’s generally in good condition and are not of a significantly high value, pressure sensitive acid free mending tapes work well. The most common requirement for an acid free tape is to fashion a repair in paper. Tyvek tapes - Very strong, used for joining Tyvek, hinging artwork, reinforcement and frame backing įoil/Copper tapes - Acts as a barrier material, used in frame backing, packaging and storage applications.Polyester tapes – for joining clear films Īcid free paper tapes (pulp) - Usually for repairing paper and lighter hinging work often buffered to prevent acidity.Linen tapes - Heavy duty tapes that are usually used for reinforcement and hinging artwork Japanese paper tapes – Many different types and weights for a range of purposes, from invisible repairs, to hinging heavy artwork Here are some of the materials available: If the adhesive is acid free but the carrier isn’t, then the tape isn’t acid free! There are various carrier materials that are acid free and used in our tapes, each designed for different applications. When talking about being acid-free, as important as the adhesive, is the carrier (or backing) of the tape. > | View all acid free tapes here click here The conservator will be able to recommend the best adhesive and tape material for your repair. For these types of repairs we always recommend consulting with a conservator. So, as you can see, when selecting an acid-free tape you also need to make sure that the adhesive will not dry out and fail, will not turn yellow and stain your paper, that it can be removed in the future – as well as being acid-free.įor conservation grade repairs on very fragile or valuable items, it may be necessary to consider a non-adhesive tape and appropriate acid free conservation grade adhesive, like wheat starch. Acid free adhesive tapes do not behave this way. Some adhesives may release acidic gasses (called off-gassing) as they degrade causing damage to any paper stored around it. Īdhesives in standard tapes can contain acidic materials which will weaken and eventually destroy the paper it has been applied to.This is not a case of simply tearing it away, a solvent would be applied, but it does mean it can be removed in the future. An important aspect of an archival tape is that it can be removed without harming the paper, and are therefore, reversible. Non-archival tapes aren’t generally reversible. This staining can be difficult if not impossible to remove. Old non-archival adhesives can degrade, turn yellow and stain the paper they have been applied to. Archival tapes from PEL are designed not to dry out or shrink. One of the problems with aging non-archival tapes is that the adhesive will gradually dry out and fail, defeating the object of its application, the repair is no longer fixed. The adhesive is one of the key elements in a pressure sensitive tape, or gummed tape, here are the issues: There are a number of different types of adhesives that have been, and are used, on pressure sensitive tapes over the annals of history. Non-Adhesive tapes – These tapes are simply continuous strips of material that can be adhered with the user’s choice of adhesive. These are generally easier to remove (reversible) if required. Gummed Tapes – These tapes have an adhesive applied to the carrier material which usually requires water to activate the adhesive. Once applied the tape requires a little pressure to ensure adhesion. The carrier (or backing) may also have a primer applied, and sometimes a release coat to stop it sticking to itself. Pressure sensitive tape – often called self-adhesive tape (or scotch tape / Sellotape / masking tape) has an adhesive applied to the tape’s carrier material. That’s important to bear in mind, as tape can have more than one component. When we talk about acid-free tape here at PEL, we make sure that the complete structure of the tape is acid free, or to put it another way, pH neutral. Archival Repair Tapes Hinging, Mounting & Framing Tapes Cotton & Fabric Tapes Archival Labels & Tags Packing Tapes
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