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How to Determine if Glass is Borosilicate
Step 1: Check for the Manufacturer's Marking
Typically, borosilicate glass will have a manufacturer's marking on it. Look for markings such as "PYREX" or "Schott Duran" as these brands are known for producing borosilicate glass.
Step 2: Test the Glass with Polarized Light
Borosilicate glass has unique stress patterns that can be seen when viewed under polarized light. By shining a polarized light source through the glass and observing any patterns that appear, you can determine if the glass is borosilicate.
Step 3: Conduct a Thermal Stress Test
Borosilicate glass is known for its high thermal shock resistance. To test if the glass is borosilicate, heat it with a torch and then immediately place it in cold water. If it withstands the sudden temperature change without cracking, it is likely borosilicate glass.
Step 4: Measure the Coefficient of Expansion
Borosilicate glass has a low coefficient of expansion, meaning it expands and contracts less with temperature changes compared to regular glass. You can use a dilatometer to measure the expansion of the glass and determine if it is borosilicate.
Step 5: Perform a Chemical Resistance Test
Borosilicate glass is highly resistant to chemicals and acids. You can test the glass by exposing it to a strong acid or base and observing if there are any visible signs of etching or degradation.
Step 6: Check the Density of the Glass
Borosilicate glass is denser than regular glass. You can measure the density of the glass using a scale and water displacement method to determine if it is borosilicate.
Step 7: Consult a Professional
If you are still unsure whether the glass is borosilicate after conducting these tests, it is best to consult a professional who is experienced in identifying different types of glass. They can provide you with a definitive answer based on their expertise.
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