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The short answer: Stamps stick together because of moisture, pressure, or the adhesive on the stamp reacting with the storage material. The most common culprits are storing stamps in humid environments, stacking them without protective sleeves, or using materials like plastic that trap moisture. To fix it, you need to control humidity, use acid-free and non-adhesive storage, and store stamps flat or in proper mounts.
Stamps are made of paper with a gum adhesive on the back. When exposed to moisture, the gum becomes tacky and can bond to another stamp or to the storage surface. Even if you don’t live in a humid climate, your storage area might have micro-climates, like a basement or attic, that increase humidity. Also, if you stack stamps loosely in a box, the weight of the stack can press the stamps together, especially if any residual moisture is present. Another factor is the type of storage: certain plastics (like PVC) release chemicals that can soften the gum over time, causing sticking.
Moisture is the number one enemy of stamp storage. When stamps absorb moisture from the air, the gum becomes sticky. Even if you think your room is dry, consider the season: summer humidity can be high. A simple test is to feel the stamps: if they feel slightly damp or cool, they have absorbed moisture. To prevent this, store stamps in a cool, dry place with relative humidity below 50%. You can use silica gel packets in your storage box to absorb excess moisture. Also, avoid storing stamps in the bathroom or kitchen where steam is common.
Even without moisture, pressure can cause sticking. If you stack stamps directly on top of each other, the pressure can force the gum to stick, especially if the stamps are hinged or have leftover adhesive. Also, some stamps have self-adhesive backing that can stick to any surface, including other stamps. If you use traditional stamp hinges, they are designed to be removable, but if you press too hard or leave them on for years, the hinge adhesive can bond with the stamp and the album page, causing damage. Always use a proper stamp mount or sleeve for each stamp, and never stack them without protection.
The materials you use are crucial. Many collectors use stamp albums with glassine interleaving, which is a paper that is slightly waxy and prevents sticking. However, if you use plastic sleeves, make sure they are made of polyethylene or polypropylene, not PVC. PVC can cause stamps to stick and also yellow over time. Acid-free and lignin-free materials are essential because acids can damage paper and adhesive. If you are using a stockbook, ensure the pages are made of archival-quality paper. For individual stamps, consider using stamp mounts, which are clear plastic sleeves with a black backing, but they only work if the stamp is not mounted on a hinge. The mount holds the stamp securely without adhesive touching the stamp.
Here are some actionable steps you can take right now:
If you find stamps stuck together, don’t panic. Do not try to peel them apart, as that will cause tearing. Instead, place the stuck stamps in a sealed container with a damp paper towel (not touching the stamps) for a few hours. The moisture will soften the gum, and you can carefully separate them. Then, let them dry completely on a flat surface. If they are stuck to a plastic sleeve, you might be able to gently slide a thin knife between them. If the stamp is very valuable, consider consulting a professional philatelist. Prevention is always better, so after separating, improve your storage conditions.
One of the most overlooked causes of stamps sticking together is poor fit. If a stamp is loose in an oversized sleeve or mount, it can slide around and rub against the plastic or paper, creating friction and pressure that encourages the gum to become tacky. Conversely, if a stamp is crammed into a mount that is too small, the tight fit can press the gum against the mount surface, leading to sticking. To avoid this, match the mount size to the stamp’s dimensions. Standard mounts come in sizes measured in millimeters, and you should choose one that is slightly larger than the stamp, typically by 1 to 2 mm on each side. For example, a stamp that is 20 mm wide and 24 mm tall should fit in a mount that is 22 mm by 26 mm. This allows the stamp to sit flat without sliding. For sheets or blocks, consider using larger mounts or stock pages with individual pockets. If you use stockbooks, check that the pockets are not too deep, as stamps can fall to the bottom and bend. Always measure your stamps before buying storage supplies, and if you are unsure, opt for adjustable systems like ring binders with interchangeable pages. Proper fit not only prevents sticking but also protects against mechanical damage.
Preventing stamps from sticking is not a one-time task; it requires ongoing maintenance. Establish a routine to keep your collection in good condition. First, set a schedule to inspect your stamps every three to six months. Look for any signs of curling, sticking, or discoloration. If you notice any stamps starting to stick, separate them immediately and replace the storage materials if needed. Second, monitor humidity levels with a hygrometer. Inexpensive digital hygrometers are widely available, and you should aim for a relative humidity between 40% and 50%. If humidity rises above 60%, take action: use a dehumidifier, add silica gel packets, or move the collection to a drier location. Third, clean your storage area regularly to prevent dust and pests. Dust can absorb moisture and introduce contaminants. Fourth, rotate your stamps if they are stored in albums that are stacked. Over time, the weight of the stack can cause pressure on the bottom albums. Instead, store albums upright but not too tightly packed, or lie them flat with no more than two or three albums stacked. Fifth, replace silica gel packets every few months, as they become saturated. Finally, handle stamps with clean, dry hands or use tongs. Oils from your skin can transfer to the gum and cause sticking. By following a consistent maintenance routine, you can avoid the common mistakes that lead to stuck stamps.
Many collectors inadvertently cause stamps to stick by making simple mistakes. Being aware of these can save your collection. Mistake one: using household plastic wrap or bags. These are often made of PVC and release plasticizers that soften gum. Always use archival-safe plastics. Mistake two: storing stamps in a damp basement or attic. Even if the rest of your home is dry, these areas can have high humidity. Choose a cool, dry room. Mistake three: overfilling albums or stockbooks. When pages are too full, stamps press against each other and the album cover, increasing pressure. Leave some space. Mistake four: using self-adhesive labels or tape to repair albums. The adhesive can migrate to stamps. Use proper archival repair tapes. Mistake five: exposing stamps to direct sunlight or heat. Heat can soften gum and cause sticking. Keep them away from radiators and windows. Mistake six: ignoring early signs of sticking. If you see stamps starting to curl or feel tacky, act immediately. Mistake seven: using paper clips or rubber bands to hold stamps together. These can rust or leave residue. Instead, use glassine envelopes or mounts. Mistake eight: storing stamps in a bathroom or kitchen where steam and grease are present. Even a small amount of moisture can trigger sticking. By avoiding these mistakes, you protect your stamps from unnecessary damage.
Yes, but only if they are made from archival-safe materials like polyethylene or polypropylene. Avoid PVC sleeves, as they can cause stamps to stick and degrade over time. If you are unsure, check if the sleeve is labeled “archival safe” or “acid-free.”
Hinges are traditional but can cause damage if not used carefully. Mounts are safer because they do not apply adhesive to the stamp itself. For mint stamps (uncancelled), mounts are recommended to preserve their condition. For used stamps, hinges are fine if you are careful, but mounts are still a better choice.
It depends on the binder. Many binders use PVC pockets, which are not safe. Look for binders specifically designed for stamp storage that use inert materials. Also, ensure the binder lies flat when storing, as upright storage can cause pressure on the bottom rows of stamps.
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