To protect carpet or hard floors from damage caused by chair castors. To allow easier movement while sitting.
If you are using a chair mat, it is advisable for you to use either Friction Brake Castors or Soft-wheel brake castors on your chair.
Friction brake castors. These are made of polypropylene as are standard castor, but have a 'brake' function - they move freely when the user is sitting, but when weight is taken off they are fixed.
Soft wheel brake castors are a combination of a soft wheel castor and a friction brake castor with a soft-tyre.
Soft-wheel castors are a standard castor with a grey polyurethane tyre. They have a little more grip than the standard castor and are softer. This would be suitable for a polished timber floor.
Pin Test - To correctly specify chairmats for carpets, measure the thickness by pressing a pin through the carpet and under lay until it reaches the floor and then measure the depth. Use the following guidelines to recommend the correct mat.
90 x 121mm Small Keyhole
3835660 Carpet up to 9ml thick
0275680 Carpet up to 12ml Thick
114 x 135mm Standard keyhole
0275690 Carpet up to 12ml thick
0349470 Carpet OVER 12mm thick including underlay
112 x 132mm Hard Floor Chairmat
3835740 Hard Floor Chair mat