Preserving – technical terms explained in a simple way

For newbies preserving isn't always easy to understand. This is also valid for some technical terms. Einkochwelt® provides you with the according definitions.

Rubber rings

Rubber rings are required for the hermatical sealing of jars. They work like a sealing ring placed between glass lid and clamps. Originally WECK® rubber rings are orange-red. Before using them rinse them in hot vinegar. Porous rubber rings should be eliminated because they don't shut the jars properly.


Clamps are needed for the hermatical closure of WECK® jars. They are made of stainless steel. For an original round rim jar,you always need two clamps.

Glass lid

The glass lid carries the WECK® strawberry logo as a relief on its top. The glass lids have different diameters such as 60, 80, 100 and 120 mm. Additionally you need a rubber ring and two clamps.

WECK® round rim jar

WECK® preserving jars are officially named round rim jars. They differ from screw lid jars. An indicator is the WECK® strawberry logo on top of the round rim jars. There are available with different diameters such as 60, 80, 100 or 120 mm and different shapes like mold (or conical) jars, tulip jars, deco jars (bulbous), cylindrical jars, convex jars, gugelhupf jars, gourmet jars and juice jars. Depending on the shape their capacity varies from 50 ml (1.8 fl.oz) to 2700 ml (95.0 fl.oz).

Twist-off jars

Twist-off jars are closed by screw lids. Twist-off jars are more commonly known as jam jars as they are often used for the preservation of jams and jellies.

Pasteurisation-resistant screw caps/compound

For preserving, hot filling, conserving and pasteurising so-called pasteurisation-resistant screw caps are needed. These caps are suitable for oleaginous fillings, but shouldn't be used at temperatures beyond 100°C. The reason is the sealing compound inside the lid. It closes the jar perfectly at only 91°C. Pasteurisation-resistant screw caps with compound should be cleaned and warmed before use. Moreover it's recommended to use them only once as the compound can lose its sealing properties when used regularly.

Swing-top jars

Swing-top jars dispose of a swing top for a hermetical closure of the jar. Swing-top jars are very popular for food storage and are normally freezer safe and microwaveable. If a jar is broken it can be recycled very easily.