Oakum
Oakum can be used to seal cast iron pipe drains. After setting the pipes together, workers pack oakum into the joints, then pour molten lead into the joint to create a permanent seal. The oakum swells and seals the joint, the "tar" in the oakum prevents rot, and the lead keeps the joint physically tight.
Today, modern methods, such as rubber seals (for example, gaskets or o-rings) are more common.
Latch seal
A latch seal is a product which helps limit access to private facilities for people without permits. А high level of strength plastic is used for the manufacture of seals. In order to protect are used the unique number which is applied to the case and closing security seal design (an insert). There are various options for the application of a unique number: laser marking (you can’t change the number or erase), pad printing, engraving.