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The most commonly used method is the Shore A measurement. This measurement follows the ISO 7619-1 standard, where the test material has a thickness of 6 mm. A disadvantage of this method is that for smaller and thin products it is not possible to measure the hardness of the rubber. Therefore the hardness in Shore A is measured on specially produced test plates. These test plates are manufactured from the same material as the articles themselves. This is done by means of special laboratory equipment with a standard production method. In this way, the data from different recipes can be easily compared with each other. A comparison between different products is hardly possible. The shape of the product influences the measurement when it is carried out on the final product, despite the fact that the different products are made from the same basic material.