KOBRA Guarantee

We use only proven raw materials to manufacture our albums. The foils used for the stock sheets of our stamp albums, sheet albums and protective covers are guaranteed to be free from plasticizers and acids. We give you this guarantee because many transparent foils contain plasticizers that are harmful to the stamps.

Topic lead sulfide damages to stamps

For some time there has been a controversial discussion about possible color changes in classic stamps, which were printed before about 1875 and were stored between rigid PVC plastic films. A reaction of lead-containing printing inks with stabilizers of this film is suspected. However, a number of independent reports have not been able to prove a causal relationship.

From about 1875 stamps were usually printed with synthetic colors. These are not affected by this problem.

Until now, we do not know from color changes in stamps, which are stored in KOBRA albums.

Of course, we can not completely exclude a risk. Please note that plastic films can offer no or only limited protection against various environmental influences such as sunlight, moisture, air pollutants and high temperatures. We therefore recommend that you regularly check your collectibles for changes.

Much of our products has been made for more than 50 years from plastic films whose neutral behavior is highlighted in various publications in this context (polypropylene, polyethylene and polyester). The rigid PVC film used by us is plasticizer and acid-free.

Below we inform you about the plastic films we use:

Polyethylene = PE
Polypropylene = PP
PVC = Polyvinylchlorid
PET = Polyethylenterephthalat (Polyester)

More detailed product data can be found in the shop at the specifications of the individual products.