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Now Accepting
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- 42 Main Street ● PO Box 778 Phone: (845) 856-2995
- Sparrow Bush, NY 12780 Fax: (845) 856-4665
- E-mail: George@sciservsd.com
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TESTING FOR ANTI-REDEPOSITION ACTIVITY The guidelines of ASTM D 4008 are followed in our procedure to measure the relative ability of detergent formulations to prevent soil deposition onto three fabrics. We also run a more realistic washing machine anti-redepostion test. Rather then use soiled cloth to supply the soil for redeposition, the soil is added directly to the wash bath. The soils are the standard soiling media used to prepare Scientific Services soiled cloths; i.e. dust sebum emulsion and clay slurry. The test requires multiple exposure to build up a measurable level of redepositied soil, so five (5) sequential cycles are run. The laboratory Terg-o-Tometer is used for the wash and rinse cycles. The water is placed in pots and the detergent or ingredients added. After the dissolution time, the soils are added and allowed several seconds to disperse. A check is made to ensure that the detergent and soils are dispersed before adding the cloth swatches. The excess water is squeezed out, by hand, after the wash and rinse cycles are complete. The swatches are allowed to oven dry before the next cycle. Reflectance are measured on the clean cloths and after every cycle of washing and drying. The "L" scale of a Gardner LX100 reflectometer is used . Culmination of deposition results vs. cycle gives the best picture of soil buildup since cycle to cycle variations often occur. STANDARD LAUNDRY CONDITIONS
Many variations from the standard conditions can be made. Runs are made in sets of four at one temperature, but detergent concentration, temperature and water hardness are often varied. If the range of variables permit interpolation to spot aberrant results, replication can usually be limited to the outlying runs or by extending the number of cycles. We also carry out several ASTM tests on project basis; i.e. ASTM 4265 Stain Removal, ASTM 3050 Detergency, ASTM D 5237 Fabric Softening, ASTM D 2960 Bundle Testing, etc.
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ashley@sciservsd.com with questions or comments about this web site.
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