PowerPoint Presentation: QUALITY CONTROL TESTS FOR GLASSES 1: Chemical Resistance of Glass Containers A. Powdered Glass Test Carried out to estimate the amount of alkali leached from the powdered glass which happens at the elevated temperatures. When the glass is powdered, leaching of alkali is enhanced, which can be titrated with 0.02N sulphuric acid using methyl red as an indicator. Step-1 : Preparation of glass specimen : Few containers are rinsed thoroughly with purified water and dried with stream of clean air. Grind the containers in a mortar to a fine powder and pass through sieve no.20 and 50. Step-2 : Washing the specimen : 10gm of the above specimen is taken into 250 ml conical flask and wash it with 30 ml acetone. Repeat the washing, decant the acetone and dried after which it is used within 48hr.
PowerPoint Presentation: Procedure : 10gm sample is added with 50ml of high purity water in a 250ml flask. Place it in an autoclave at 121⁰C±2⁰C for 30min. Cool it under running water. Decant the solution into another flask, wash again with 15ml high purity water and again decant. Titrate immediately with 0.02N sulphuric acid using methyl red as an indicator and record the volume.
PowerPoint Presentation: B. WATER ATTACK TEST : This is only for treated soda lime glass containers under the controlled humidity conditions which neutralize the surface alkali and glass will become chemically more resistant. Principle involved is whether the alkali leached or not from the surface of the container. Procedure: Rinse thoroughly with high purity water. Fill each container to 90%of its overflow capacity with water and is autoclaved at 121⁰C for 30min It is cooled and the liquid is decanted which is titrated with 0.02N sulphuric acid using methyl red as an indicator. The volume of sulphuric acid consumed is the measure of the amount of alkaline oxides present in the glass containers.
PowerPoint Presentation: Tolerance Limit for Glass Containers: TESTS CONTAINER VOL. of 0.02N H2SO4 Powdered glass test Type I Type II Type III 1 8.5 15 Water Attack Test Type II (100ml or below) Type II (above 100ml) 0.07 0.02
PowerPoint Presentation: 2: Hydrolytic Resistance of Glass Containers: Rinse each container at least 3 times with CO 2 free water and fill with the same to their filling volume. Fill & Cover the vials and bottles and keep in autoclave. Heat to 100⁰C for 10min and allow the steam to issue from the vent cork. Rise the temp from 100⁰C to 121⁰C over 20min. Maintain the temp at 121⁰C to 122⁰C for 60mins. Remove the container from autoclave, cool and combine the liquids being examined. Measure the volume of test solution into a conical flask and titrate with 0.01M HCl using methyl red as an indicator. Perform blank with water and the difference between the titration represents the volume of HCl consumed by the test solution .
PowerPoint Presentation: 3: ARSENIC TEST: T est is for glass containers intended for aqueous parentrals . Wash the inner and outer surface of container with fresh distilled water for 5min. From test samples prepared, pipette out 10ml solution from combined contents of all ampoules to the flask. Add 10ml of HNO 3 to dryness on the water bath, dry the residue in an oven at 130⁰C for 30min cool. A dd 10ml hydrogen molybdate reagent, dissolve and heat under water bath and reflux for 25min. Cool to room temp and determine the absorbance at 840nm. Do the blank with 10ml hydrogen molybdate. The absorbance of the test solution should not exceed the absorbance obtained by repeating the determination using 0.1ml of arsenic standard solution (10ppm) in place of test soln.
PowerPoint Presentation: 4) THERMAL SHOCK TEST: Place the samples in upright position in a tray. Immerse the tray into a hot water for a given time and transfers to cold water bath. Examine cracks or breaks before and after the test. The amount of thermal shock a bottle can withstand depends on its size, design and glass distribution. Small bottles withstand a temp differential of 60 to 80⁰C and 1 pint bottle 30 to 40⁰C. A typical test uses 45C temp difference between hot and cold water. 5) INTERNAL BURSTING PRESSURE TEST : The most common instrument used is American glass research increment pressure tester .The test bottle filled with water and placed inside the test chamber. T he internal pressure automatically raised by a series of increments each of which is held for a set of time. The bottle can be checked to a preselected pressure level and the test continues until the container finally bursts. 6) LEAKAGE TEST: Drug filled container is placed in a container filled with coloured solution (due to the addition of dye)which is at high pressure compared to the pressure inside the glass container so that the coloured solution enters the container if any cracks or any breakage is present.
PowerPoint Presentation: QUALITY CONTROL OF CLOSURES P reparation of Sample (sol.-a): Wash closures in 0.2%w/v of anionic surface active agents for