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Sometimes glass cups stick together if you stack one on top of the other. This often happens because glass expands when washed with hot water, then contracts when it cools. If you want to unscrew glassware, read on for methods of gently twisting, heating, and lubricating the cups!
Steps
Heat use
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Understand how glass reacts to heat. Often glass cups stick together when you stack one on top of the other immediately after washing. Glass expands when heated and contracts when it cools, and this is enough for the cups to stick together in some cases. [1] X Research Source Don’t worry: you can use this phenomenon to separate cups.
- To avoid this problem in the future, you should be careful when stacking cups on top of each other. Wait for the glass to cool first. If you wash the cup with cold water, it’s fine.
Heat the cup outside. This method is risky, so you need to be very careful. The outer cup shrinks around the inner cup, so you need to expand it to loosen the inner cup. Gently heat the outer cup by turning on the hot water to run down for about 1 minute. Luckily, the cup will come loose. If not, you might consider cooling the cup inside by pouring cold water in. [2] X Research Source
- Avoid using ice or boiling water. A sudden change in temperature can cause one of the cups to break and is very dangerous. [3] X Research Source The glass cup is inherently compressible, so the situation is more risky.
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Cool the cup inside. If you can’t separate the cups just by heating the outer cup, try cooling the inner cup. The outer cup will expand, and the inner cup will contract.
Try a bowl of hot water. First, pour cold water into the cup above. Next, pour hot water into a shallow bowl and immerse the cup below in hot water. Soak for a few minutes, then try to pull out the cup. [4] X Research Sources
Gently pull out the cups. The difference in temperature will help the cups loosen. Hold the two cups tightly, one hand grasping the bottom of the outer cup, the other hand grasping the mouth of the inner cup. Twist and incline the cups, then gently remove them. [5] X Research Sources
- If you still can’t separate the cups, try soaking them for a while to let them expand and contract. Soak the cup below in a bowl of hot water and try removing it after a few minutes.
Use force
Try to twist or slope the cups to come apart. A random beaker is rarely perfectly round, so the top cup can only “clip” in two points with the cup below. If the cup moves when it is tilted, it means you are lucky, and it will be much easier to separate the cup
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Be gentle. Remember not to use excessive force. If you twist too hard, you could break one or both of the cups. If the cups come loose all of a sudden, they may slip or fall out of your hand.
- Make sure to hold the cups tightly. Dry the cup and hands before removing the cup. If you lose your hand, the cup may fall and shatter!
Consider smashing one of the cups. If you just can’t get the two cups out, perhaps the solution of breaking one cup will keep you from losing both. Place the cup on a stable and easy-to-clean surface, or hold the bottom of the cup in one hand. Use a hammer to tap the rim of the outer cup until it cracks. You run the risk of breaking both cups – but this can be a last-ditch effort.
- Remember to clean up any broken pieces of the cup. Safety above all!
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Try blowing between two cups. Sometimes there is a thin layer of water between the two cups that causes them to stick together. Try inserting a straw into the gap between the two cups and blowing into it. Just a little air is enough, but you should blow as much as possible, as the straws are being squashed.
Lubricating the cup
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Apply a thin layer of lubricant. If the cups still won’t loosen, and you’ve tried twisting/increasing the cups to no avail, the next step is to apply a thin layer of lubricant. A little olive or sunflower oil can help. You can also try soap. This is especially effective if the cups are “clamped” to each other instead of tightly glued. [6] X Research Source
- Consider combining the use of oil with the heating method. This can work with sticky cups.
- Try WD-40 oil as a last resort. Spray WD-40 oil between the two cups. The oil will spread on its own and will help you remove the two cups fairly easily. Remember to wash the cup thoroughly after separating the cup: WD-40 is toxic to humans.
Pour oil between 2 cups. Tilt the cup slightly up and down so the oil gets into the jam. When you shake the cups, the oil can loosen them enough to separate. Wet the cup to help spread the oil.
- Try using a thin straw or blade to push the lubricant between the two cups. Take it easy!
Twist and separate the two cups. When you see that the lubricant is enough, grasp the inner cup with your dominant hand, the other hand hold the outer cup. Twist the two cups in opposite directions to loosen the sticky spot, while also separating the two cups with a lighter force. Focus on twisting instead of pulling out the cup. If the twist works, the cup will loosen on its own.
- Don’t try to pull the cup straight out! A force sufficient to hold the cup firmly can break the cup.
Advice
- This works because the top cup shrinks, and the bottom cup expands.
Warning
- Do this over the sink to prevent spills.
- Don’t immerse delicate cups in hot water, unless you’re sure it’s okay.
- Hold the cups low over the sink, and be careful not to drop them. The wet glass beaker is quite slippery.
Things you need
- Warm water and cold water
- Shallow bowl (optional)
- Oil (optional)
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wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 14 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 5,403 times.
Sometimes glass cups stick together if you stack one on top of the other. This often happens because glass expands when washed with hot water, then contracts when it cools. If you want to unscrew glassware, read on for methods of gently twisting, heating, and lubricating the cups!
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