The above are the markings you would need in order to ensure that you are choosing only certified insulating mats. When it comes to switchboard matting regulations in India, it is mandatory to ensure a well-insulated work station for people who work on live equipment.
Apart from X-volt certified IS 15652:2006, you can also choose Safevolt under the same certification. You will get the BIS/CPRI/ERDA certification and a Test Certificate along with all supplies. Slightly expensive than X-Volt because of the premium finish.
The only difference between the Safevolt and X-Volt is that X-Volt is aimed at price-sensitive clients. Regardless, once you provide clarity in the thickness, size, colour you need, you could get yourself premium grade insulating mats.
However, you will also find IS 5424:1969 Rubber Mats which are the preceding standard for the updated IS 15652:2006. This standard is still wide spread for general use.
But, we at Duratuf always recommend using the most updated compliance certification for insulating mats which are Safevolt and X-Volt.
Not all major manufacturers will be able to provide easy delivery with custom sizes, shapes and colours, but there are leading rubber sheet manufacturers in India who will.