Decide what the comparison must answer
A buyer may need a cloth that picks up a small spill quickly, retains water during drying work, or becomes ready for use again after hanging. One result cannot answer all three questions. Define the task and what would count as an acceptable sample before selecting a test routine.
Keep the same washing history and conditioning arrangement for each candidate. Record water temperature, sample dimensions and the measuring equipment. For a contractual or packaging claim, agree the appropriate laboratory method rather than treating an informal comparison as a certificate.
Record uptake by dry mass and wet mass
For an agreed immersion comparison, weigh the conditioned sample, wet it using the same duration and procedure, and weigh it after a fixed draining interval. State the interval and whether the cloth is squeezed. Wet mass minus initial dry mass gives the water mass at that defined point.
Water mass divided by dry cloth mass gives grams of water per gram of dry cloth. It does not measure pickup speed. If pickup speed matters, use a separate timed trial on the same surface with a measured water load and a specified wiping routine.
Separate draining from wringing
A sample weighed after free draining cannot be compared directly with one weighed after hand wringing. Hand force varies, so describe the wringing procedure and its limitations. If retained water after compression is commercially important, agree a controlled procedure or request laboratory support.
Report mass in grams and specify whether packaging, labels and edges are included in the measured sample. Do not compare carton gross weight with cloth mass or use an unspecified high-absorbency claim in place of the recorded result.
Track drying under the same conditions
Choose a defined starting water load, then hang samples with the same support, spacing and airflow conditions. Record room temperature and humidity where possible. Weigh at fixed intervals and define the endpoint in advance, such as returning within an agreed margin of the initial conditioned mass.
Do not present a test at unequal starting water loads as an isolated material comparison. A drying endpoint should also be consistent; a cloth that feels dry to one observer may still contain measurable moisture.
| Measurement | Record | What it does not prove |
|---|---|---|
| Water mass at defined drain point | Wet mass minus initial dry mass, in grams | Pickup speed or surface safety |
| Mass-normalised uptake | Water mass / dry cloth mass, in g/g | Universal performance across sizes and routines |
| Retained water | Specified draining or wringing procedure | Result under a different applied force |
| Drying endpoint | Starting load, time, temperature, humidity and endpoint | A fixed drying time in every environment |
Select samples that answer a useful sourcing question
SM21001 and SM21005 share the listed 80/20 blend, 300 GSM and 30 × 30 cm size, while their grid and waffle constructions differ. They form one possible construction comparison. SM71008 and SM71009 share a listed 81/19 blend and 40 × 60 cm size, with 500 and 375 GSM respectively; use the car-cleaning catalogue for those codes.
Keep both individual results and variation across samples. Put the chosen test conditions, acceptance rule and reference-sample identification into the order. A measured result for one sample does not become a universal absorption multiple or a guaranteed drying time for the whole material family.
Worked calculation with illustrative numbers
For illustration only, assume a conditioned cloth weighs 20 g and weighs 80 g after the agreed wetting and draining procedure. The retained water at that point is 80 − 20 = 60 g, and the mass-normalised result is 60 / 20 = 3 g/g. These invented numbers explain the calculation; they are not a measured result for a SINOCLEAN product.
If a second cloth has a different dry mass, keep both its absolute water mass and g/g value. Then run a separate application check if the commercial requirement is to dry a defined area of glass or paint. A good g/g result does not by itself establish the number of panels a user can dry or how fast the cloth will dry on a hook.
Copy these fields into your enquiry or approval record
For [sample reference], record conditioned dry mass, dimensions, preparation, wetting time, drain or wring procedure, wet mass, drying arrangement, temperature/humidity where recorded, weighing intervals and endpoint. Agree the acceptance rule before approval.
Catalogue references and scope
The item specifications cited in this guide come from the linked SINOCLEAN catalogue entries. They identify the proposed products; they are not independent performance results. Sample routines and calculation examples are buyer guidance, not reports of completed factory or laboratory tests. Confirm the final specification and supporting evidence with the quotation.
- SM21001 — Weft-knitted grid cloth
- SM21005 — Waffle Towel
- SM71008 — Car Microfiber cloth
- SM71009 — Car Microfiber cloth
Related reading: Why does a microfiber cloth leave lint, and how should buyers check samples? and What should buyers test before approving a microfiber cloth order?.