Uniband bands are made from synthetic polymers that are produced to very tight physical property specifications. There is little or no variability in the properties of the raw materials. What’s more the Uniband bands are made using a precision engineering manufacturing process. All Uniband bands are made to very tight specifications in an ISO 9000 QA environment facility in the UK. It is the modulus of a band, i.e. the force required to stretch the band to a given amount of elongation, which is the controlling factor, not the thickness or diameter as with latex bands. This means that every Uniband band or tube is certain to deliver exactly the same resistance force without any overlap to another colour level. Uniband bands are highly consistent in performance.
Latex bands are made from natural rubber latex which is a material that can be quite variable in its physical properties. Also the process involved in converting the natural latex into solid rubber to make the bands is not easily controllable. This often results in bands that have significantly different resistance levels from one batch to the next. Often the resistance level of a band of one colour can overlap the resistances of the bands of the colour level higher or lower than the specific band being used. Latex band manufacturers publish the resistance levels for each colour of band but this is an average number and they do not tell you the tolerance ranges as these can be very wide.