The Rothwell scale, or Rothwell system, or Rothwell method, applied to incontinence care products, is a scale that shows how absorbent a particular incontinence pad or adult diaper is, and how much liquid it can hold before it is likely to leak.
The system provides a quick reference for assessing how much liquid can be held by a sheet, pad or diaper, and therefore how appropriate it will be for a particular individual in any given circumstance. The scale is based on the total absorbency test ISO 11948-1. The scale runs from 1 to 22, with 1 being able to hold the least liquid, measured in grams, and 22 the most. The scale also applies a prefix to show what type of product is being referred to, with pads and sheets having an “I” prefix, and all in one diapers using a D prefix.
|I1||0g to 49g||D14||1300g to 1699g|
|I2||50g to 99g||D15||1700g to 2099g|
|I3||100g to 199g||D16||2100g to 2499g|
|I4||200g to 299g||D17||2500g to 2899g|
|I5||300g to 449g||D18||2900g to 3299g|
|I6||450g to 599g||D19||3300g to 3699g|
|I7||600g to 799g||D20||3700g to 4099g|
|I8||800g to 999g||D21||4100g to 4499g|
|I9||1000g to 1249g||D22||4500g to 4899g|
|I10||1250g to 1499g|
|I11||1500g to 1799g|
|I12||1800g to 2099g|
|I13||2100g to 2499g|
|I14||2500g to 2899g|
|I15||2900g to 3299g|
- M Fader, A Cottenden, K Getliffe, H Gage, S Clarke-O’Neill, K Jamieson, N Green, P Williams, R Brooks and J Malone-Lee, "Absorbent products for urinary/faecal incontinence: a comparative evaluation of key product designs", Health Technology Assessment, vol. 12, no. 29, 2008.
- A.M Cottenden, J.G Rothwell, H Leander, C Grau, R.J Brooks, "An investigation of the repeatability and reproducibility of ISO 11948-1 (the Rothwell method) for measuring the absorption capacity of incontinence pads", Medical Engineering & Physics, vol. 24, iss. 2, pp. 159-163, March 2002.
- ISO 11948-1:1996, "Urine-absorbing aids -- Part 1: Whole-product testing", International Organization for Standardization, 1996