# Determination of Scouring Loss in Silk Textiles Materials

## Scouring Loss in Silk Textiles Materials

### SCOPE

This SOPs prescribes a method for determining the scouring loss in silk textiles materials.

### PRINCIPLE

A known amount of sample is scoured with mild soap and soda solution. The loss in weight is determined and expressed as a percentage of the dry weight of the sample.

### APPARATUS

• Desiccator.
• Weighing bottles – with stopper
• Oven  – 105° to 110°C
• Beaker 250 ml

### REAGENTS

• Sodium carbonate- 1 percent.
• Soap solution – preferably olive oil soap

### PROCEDURE

• Take a test specimen of about 5 g in a previously tarred weighing bottle.
• Dry the test specimen in the drying oven at 110°C for two hours, cool in a Dessicator
• Weigh accurately to nearest 2 mg and calculate the oven dry weight of test specimen.
• Take the dried specimen in beaker and boil it gently for 1 hour with 150 ml of soap solution.
• After one hour, squeeze the test specimen and transfer to a beaker containing 150 ml of sodium carbonate solution and boil for half an hour.
• Take out the test specimen; wash it thoroughly with hot water for about 20 minutes.
• Again dry the test specimen in oven for 2 hours, weigh to constant mass.
• Determine the oven dry weight of the test specimen.

### CALCULATIONS

Calculate the scouring loss by the following formula

#### Scouring loss, percent = 100 x (W1 – W2) / W

Where
• W1 = oven dry weight, in g, of the specimen before scouring.

• W2 = oven dry weight, in g, of the specimen after scouring

REFERANCE: – IS 1582:1968- determination of scouring loss in silk textiles materials.