Quality inspection of Hot Insulated Glass Cup
The purpose of the Hot Insulated Glass Cup is to hold water, so its quality and safety are very important. Choosing a glass is also a factor we need to consider, let's test the glass today, I hope it will help you better understand:
1. Sample preparation
Take several Hot Insulated Glass Cups to be tested, rinse them with water, rinse with distilled water three times, and then dry them in the air. After crushing the glass cups, select 30g-50g of monochromatic fragments with a thickness of more than 1.5mm, and put them in a mortar to crush and grind. Use standard sieves with apertures of 0.5 mm and 0.3 mm to screen out particles larger than 0.3 mm and smaller than 0.5 mm. Spread about 10g of the sieved particles on clean paper, and use a magnet to move repeatedly to remove iron filings until the iron filings are no longer there. Appearing on the magnet, the sample is placed in a porcelain dish, washed 6 times with absolute ethanol, then placed in an oven at 110°C-120°C to dry, and placed in a desiccator to cool.
2. Measurement steps
Accurately weigh three processed samples, each weighing 2.00 grams, into a pretreatment bottle with a minimum volume of 50 ml, rinse the samples on the bottle wall with distilled water, and at the bottom, add distilled water to the mark. Take another pretreated 50ml volumetric flask, add distilled water to the blank test balance, soak the four volumetric flasks in a hot water bath at (98±1)℃ for 5min to half of the neck of the bottle, and recover within 5min to (98±1)°C. Then cap the bottle, keep it warm for 1 hour, take out the volumetric flask, open the bottle stopper, immerse it in a cold water bath to half the neck, cool to room temperature, adjust to the mark with distilled water, then cap the bottle, shake well and let stand for 5 minutes to make the sample The particles settled and the supernatant was obtained.
Transfer 25 mL of supernatant from three volumetric flasks to three conical flasks, add 2 drops of 0.25% methyl red solution to each flask, titrate with 0.01N hydrochloric acid standard solution to a reddish color, and record the 0.01N hydrochloric acid standard solution respectively. The number of milliliters, and the average value is v.
When choosing the Hot Insulated Glass Cup, in order to ensure the quality, it is recommended that users buy from regular manufacturers, which can ensure the quality of the product and the price is more affordable.