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CJ Blok Sp. z o. o. guarantees the quality of manufactured and sold products confirmed by the EN ISO 9001:2008 certificate no: CQS 2217/2013, moreover, in accordance with the building law, declarations of conformity are issued for individual products with the CE marking valid in the European Union. Products manufactured by CJ Blok are in accordance with PN-EN standards. The quality of our products is also confirmed by the international certificate IQNet enabling sale all over the world.