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STAINING RESISTANCE - ANSI NALFA LF01 - 2008 (3.4) (adapted)

1. TOOLS
1.1 Concave glass covers
1.2 Appropriate lighting
1.3 Nylon bristle brush
1.4 One Kg mass
1.5 Cellulose sponge measuring 75x100x50 mm
1.6 Clean, soft cloth
1.7 Cotton balls
1.8 Commercially available cleaner
1.9 A 5% (+/-0.5%) solution of sodium hypochlorite
1.10 Baking soda
1.11 Water
1.12 Acetone
1.13 15 different test reagents

REAGENT #

REAGENT

APPLICATION

1

Distilled water

2 drops (6 mm) and cover with watch glass

2

Ethanol solution

As above

3

Acetone

As above

4

Household amonia

As above

5

10% Citric acid

As above

6

Vegetable oil

As above

7

Coffee

As above

8

Tea

As above

9

Catsup

As above

10

Mustard

As above

11

10% Povidone iodine

As above

12

Black permanent marker

6 mm spot but do not cover

13

# 2 pencil

As above

14

Wax crayon

As above

15

Black paste shoe polish

As above

 

2. SAMPLING
1 400x100xthickness or another size which allows placement of the 15 test reagents in 2 lines (reagents shall be placed no less than 25 mm apart)

3. ENVIRONMENTAL CONDITIONS
Temperature: 23 (+/- 2) °C
Relative humidity: 50 (+/-) 5%

4. TESTING PROCEDURE

4.1 Clean the sample surface, with the help of the commercial cleaner and the soft cloth; then rinse with water and dry with a clean, soft cloth.
4.2 Place a 6 mm  spot of each reagent on the sample surface and then cover the reagents with clearly marked glass covers. Move each glass such that the covered reagent comes in contact with the glass rim and the reagent is both covered and uncovered where the watch glass sits. The entire glass cover rim shall be wetted with the reagent


4.3 Wait for 16-24 hours
4.4 Clean the sample in the following order:

  1. Flush with water and wipe with a sponge. If the test reagent is removed, then it scores “0”
  2. If a stain remains, place a commercial cleaner on the stain and the sponge and, with the help of the 1 Kg weight, push the sponge back and forth without downward pressure for 25 cycles. Rinse and wipe. If the test reagent is thus removed, then it scores “1”
  3. If a stain remains, place a commercial cleaner and baking soda on the stain and scrub for 25 cycles with a nylon bristle brush. Rinse and wipe. If the test reagent is thus removed, then it scores “2”
  4. If a stain remains, use a cotton ball saturated with acetone to rub the stain for 2 minutes. Rinse and wipe. If the test reagent is thus removed, then it scores “3”
  5. If a stain remains, place a cotton ball saturated with hypochlorite bleach on the stain, and allow it to remain in contact for a period of 2 minutes. Rinse and wipe. If the test reagent is thus removed, then it scores “4”
  6. Any remaining stain scores as a “5”

 

4.5 Calculate:

The cleanability score is the number resulting from adding the grades of each individual reagent
For each reagent, evaluate the remaining stain as “no effect”, “slight effect”, “moderate effect”, “severe effect”

5. ASSESSING TEST RESULTS

Score < 20 and no more than slight effect


 
  
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