The high-efficiency formula ingredients require identification with irritant and caustic symbols since heat and rising vapours may occur when the product is used due to the reaction of the ingredients. These vapours (e.g. warm sodium hydroxide) may irritate mucous membranes if your face comes into contact with the vapours. This may lead to an irritated throat or watery eyes. For this reason please keep your distance when you use the product and open a window.
Yes, as they were tested with all conventional pipe materials. EC-standard pipes can also withstand temperatures up to 80°C.
No, not if you use the products properly and rinse after the usage with water. Like all materials, sealing rings are subject to the normal processes of ageing and must be replaced at certain intervals.
No. Basically, rorax products cannot be used to remove blockages in toilets since such blockages are mainly caused by accidentally flushed waste. This type of blockage should definitely be cleared by a plumber. In addition the use of pipe unblockers - depending on the formula - may even cause harmful chemical reactions as soon as they come into contact with "acid cleaners" (e.g. WC cleaners). Therefore their use is strictly not recommended in toilets.
If you have any questions about our products or our brand, please use this form to get in touch with us.
Alternatively, please call our customer service team on
Your comments have been sent to our team with these contact details:
Your enquiry request will be processed as quickly as possible.
Werner & Mertz GmbH
55120 Mainz, Germany
Phone: +49 6131 964-01
Local Court (Amtsgericht) Mainz, HRB 74
Tax identification no: DE149064223
Phone: +49 6131 964-2028
Fax: +49 6131 964-2030
Geometry Global GmbH
Darmstädter Landstraße 112
60598 Frankfurt, Germany
KEMWEB GmbH & Co. KG
55122 Mainz, Germany
Although we check and update our websites regularly, information can change quickly. We therefore cannot be held liable for the validity and completeness of the information on our sites, or on third-party sites to which we link. The content and structure of the Werner & Mertz GmbH websites are copyright. You must obtain our consent before reproducing text, images and other information.
Thank you for your interest in our company and our website. Although we take great care to check their content, we cannot assume any liability for external links to other websites.
The protection of all personal information collected, processed or used during your visit to our website is important to us. Your data is protected in compliance with German laws. Please see below for detailed information about how data is collected during your visit to our site and how this data is used.
1. Collecting and processing data
Each time you access our website or download a file from the site, a log is created. This data is stored for internal system-related and statistical purposes only.
The following items appear in the log:
More detailed personal data is recorded only if you provide us with it voluntarily – when filling in a form, for example.
2. Usage and forwarding of personal data
We will only use the personal information you have provided to respond to enquiries or for technical administration purposes.
Your personal data will not be disclosed to third parties.
3. Right to access information
Upon written request, we would be happy to inform you about any information that has been stored in relation to your person.
Any personal information that has been saved will be deleted if you revoke your permission for it to be stored via mail (email@example.com), if the information is no longer necessary in order to fulfil the purpose it has been stored for, or if the information may no longer be stored due to legal reasons.
We use all the technical and organisational means available to us in order to store your personal information in such a way that it cannot be accessed by third parties. When communicating via email, however, full security cannot be guaranteed. For this reason, we recommend using the conventional post system for the communication of confidential information.
Google Analytics declaration: