O-rings are available in a wide range of sizes, hardnesses and colours. It is vital to understand what all three factors mean and how they affect applications, equipment and processes. O-rings are available in a variety of colours, as each colour has a secret meaning. The colour can indicate the type of material on which the O-Ring is based and is set by industry standards. For many years, industry standards have been based on the common colours that come with these materials. Sanshi Rubber can supply any O-Ring material in any colour, please contact us if you require more information. O-Ring Colours O-Rings can come in a variety of colours. These are the standard colours of materials based on the industry. Sanshi Rubber can supply O-Rings in any colour for any material O-rings come in a variety of colours and it is important to understand what these colours mean as your choice of O-ring will affect your overall process application. Ultimately, different O-ring colours are used to help differentiate between different materials. Sanshi Rubber can provide O-Rings in a variety of colours using a wide range of materials. The good news is that we can order our O-Rings directly online here; however, if you have specific questions about O-Rings, colours and materials, please write at sale@chinarubber.cc. or click this page for more information about O-Rings. Yellow, Black and Green O-Rings Black O-Rings Black O-Rings are manufactured from EPDM and are best suited for applications such as heating, fire protection, drinking water and sanitary water. They comply with EN 681-1 and have SECURFRABO patented system safety. They can also withstand temperatures as low as -10 degrees and as high as over 110 degrees. Yellow O-ring Manufactured with HNBR, you will find yellow O-rings for gas applications in accordance with standard EN 549. These standards also differ in that EN 681-1 yellow O-rings are suitable for water and EN 549 yellow O-rings are suitable for gas. The patented safety system SECURFRABO. Yellow O-Rings are available for water and gases down to a minimum temperature of -20 degrees and a maximum temperature of +95 degrees. For those O-Rings that are only available for gases, a minimum temperature of -20 degrees and a maximum of +70 degrees can be achieved.