Non-Volatile Residue Testing of HDPE Container

Non-volatile Residue testing has three different types in the medium.

Water
Alcohol
Hexane

Preparation of apparatus

Take a glass stopper, 250 ml graduated cylinder of type I Glass. Clean glassware thoroughly with hot nitric acid and rinse with water. Successive cleaning with acetone and methylene chloride. Clean all other equipment by scrubbing with a suitable detergent and prolonged rinsing with water. The container and equipment used for extraction.

Preparation of sample

Take a sample of an HDPE Container portion of 120 cm² total surface area (both sides combined). It is subdivided into 3mm in width and 5cm in length.

Transfer the subdivided sample to a glass stopper, 250ml graduated cylinder of type I glass, and add 180ml of water to rinse the sample for about 30 seconds to drain off the water. Repeat with a second washing.

Water medium

Transfer the prepared sample and add 150 ml of water medium extraction flask, extract by heating in a water bath at 70⁰c temperature for 24 hours, cool, but not below 20⁰c.

Take two a fused silica crucible that has been acid-cleaned. Take the tarred weight of both crucibles at analytical balance. Transfer 50 ml of extract of the prepared sample to the tarred crucible. Add in another crucible 50ml of water. Evaporates the volatile matter in a water bath at 70⁰c till the sample evaporates.

The difference between the amounts obtained from the specimen and the blank does not exceed 12 mg

2. Alcohol medium

Transfer the prepared sample and add 150 ml of ethanol medium extraction flask, extract by heating in a water bath at 70⁰c temperature for 24 hours, cool, but not below 20⁰c.

Take two a fused silica crucible that has been acid-cleaned. Take the tarred weight of both crucibles at analytical balance. Transfer 50 ml of extract of the prepared sample to the tarred crucible. Add in another crucible 50ml of Ethanol. Evaporates the volatile matter in a water bath at 70⁰c till the sample evaporates.

The difference between the amounts obtained from the specimen and the blank does not exceed 75 mg

3. Hexane medium

Transfer the prepared sample and add 150 ml of Hexane medium extraction flask, extract by heating in a water bath at 50⁰c temperature for 24 hours, cool, but not below 20⁰c.

Take two a fused silica crucible that has been acid-cleaned. Take the tarred weight of both crucibles at analytical balance. Transfer 50 ml of extract of the prepared sample to the tarred crucible. Add in another crucible 50ml of Hexane. Evaporates the volatile matter in a water bath at 50⁰c till the sample evaporates.

The difference between the amounts obtained from the specimen and the blank does not exceed 100 mg