How do I know if my sleeves are acid free?

Often times the manufacturer will state this on the packaging. But the simplest way is to look at the “recycling symbol” on the packaging. This will give you the best indicator of the sleeve material.

Are polypropylene sleeves archival?

Both polyester or polypropylene are considered archival-safe by the U.S. Library of Congress (learn more). The different chemistry between polyester or polypropylene gives them different attributes as sleeves and bags.

What is an archival sleeve?

Archival Methods’ sleeves, made specifically for photographic prints and negatives yet perfect for a variety of other flat collectibles, allow one to share their collections with the added layer of protection and security that high quality archival sleeves provide.

Is all polypropylene acid free?

Finally there are Polypropylene (PP). This material is considered archival safe as it is chemically stable and as close to PH neutral as technical possible with plastic and does not contain any plasticizers. It comes in many different grades of clarity and stiffness depend upon the thickness of the individual page.

Is there a way to tell if paper is acid-free?

The pH Test – There are several methods for testing the acidity of paper: titration tests through cold and hot extraction (these require a destructible sample, pH meters, and a closely controlled environment) and surface pH tests. The surface tests can be conducted using pH pens, a liquid chemical, or pH strips.

Is all tissue paper acid-free?

Is all tissue paper acid free? No – paper can be acid free or non acid free. They have different purposes, which is why it’s important to check which type of paper is best for the product you’re packing. Standard tissue paper of course still has a place in packaging and presentation.

What are archival sleeves made of?

Archival plastic enclosures can be made from polyester, polypropylene or polyethylene. Although polyester is the most inert of the three, it can generate static electricity which attracts dust and is very expensive. Polypropylene is a stiff, high clarity, and chemically stable plastic.

How do you preserve old documents?

Properly store your documents. Store documents flat in a cool, dry, and dark area. Papers should always be stored in acid-free, alkaline materials (like boxes, folders, or mats) or in polyester film folders. Never keep your documents in a damp or humid areas, such as basements, attics, or bathrooms.

What are Mylar sleeves?

MYLAR CARD SLEEVES These 4 mil sleeves are made of museum grade Archival Polyester (Mylar), an inert material of the highest clarity. Polyester will not discolor, damage or adhere to items placed inside it. It is a sturdy film that will give extra support to fragile items.

What is the difference between acid-free and archival?

Although most places equate the two terms, “Archival” is equal OR better than “Acid-free” basically… ‘archival’ implies pH neutral (or less) and ‘acid free’, in addition to whatever other characteristics intended for the long term life of the artwork.

Does tissue paper have acid in it?

Since wood pulp naturally contains high amounts of acid, most paper and tissue wrapping paper products can be acidic. These products can become even more acidic as the chemicals in the materials age, resulting in yellowing and brittleness.

Does parchment paper have acid in it?

(However, parchment paper is manufactured with acid, and has a low pH, making it inappropriate for archival documents where acid-free paper is the better choice.)