How to Melt Glass Bottles

How to Make Glass Bottles

Manipulating a glass wine bottle is an exciting process that allows you to take a recycled item and create a distinctive piece of glass art. Using high temperatures of over 1,500 degrees, you can bend and shape the vessel to create functional items, such as cheese platters, or make decorative works like wall hangings.

Tools

Reshaping or slumping a wine bottle requires specialized tools and supplies that get hot enough to soften the bottle’s glass and have the heat resistance needed to support the hot bottle.

First, purchase a kiln (also known as an annealer), which is an oven that can reach extreme temperatures. For slumping, you will need a kiln that reaches 1,475 degrees, but ideally you should look for one that reaches 1,500 degrees. Manufacturers of these ovens include Paragon, Skutt and AIM and are available from lampworking and stained glass suppliers.

Next, obtain a kiln wash or fiber paper product to cover your kiln shelf. The wash or fiber paper, available from warm glass suppliers like Slumpy’s, is applied before you place the bottle inside to keep the glass from sticking to the kiln when it melts. You only need to use one product (the kiln wash or fiber paper) and you must follow the instructions on the package for proper application.

Continue by acquiring a devitrification spray for your wine bottle. Use a solution, such as Fusemaster Superspray, to spray the vessel to make sure the glass does not develop a cloudy or bubbly appearance when melted.

Additionally, you can opt to select a mold for your bottle so it will melt into a particular shape when it is heated. Warm glass suppliers like Slumpy’s offer a wide range of concave and convex materials that can withstand a kiln’s high temperatures.

Prepare the Bottle

To ensure the best possible outcome, prepare your glass wine bottle before attempting to manipulate it. Remove the label on the bottle by soaking it in a sink of warm, soapy water or use a hair dryer to warm the tag. Scrape and/or peel off the paper and continue to clean the remainder of the bottle before drying it. Spray a devitrification solution over the entire surface of the bottle.

Process

Use a standard slumping process for melting your vessel and be aware that not all kilns perform the same, so this procedure may take some practice.

Start by placing the wine bottle in the annealer on its side, turn the oven on and allow it to heat up to 1,100 degrees. Remain at this setting for 10 minutes so the entire vessel has enough time to absorb the heat.

Adjust the kiln temperature so it increases by 250 degrees an hour until it reaches 1,300 degrees. Watch closely to ensure the bottle does not get too hot too fast and crack. When the appropriate temperature is reached, increase the heat to 1,475 degrees.

Continue by watching the bottle’s progress by peering into the kiln window or by quickly opening the door. While at 1,475 degrees, the vessel is at its melting point and is taking a new shape. Stay at this temperature until the bottle reaches the form you desire.

When you are happy with the bottle’s form, quickly lower the temperature to 1,100 degrees by opening the door to crash cool the kiln. You do not want any more melting to occur, and rapidly lowering the temperature helps keep the bottle’s current shape.

Lastly, continue to cool the oven, but this time control the temperature drop so it does not drop more than 150 degrees an hour. If you have a digital controller, you can program this setting so you do not need to watch the kiln.

Remove the newly formed glass wine bottle from the annealer when it is cool and wash away any kiln debris with soapy water.

Glass bottle slumping is extremely popular because you don’t need to buy expensive glass and it gives artists the opportunity to recycle wine and/or beer bottles.

When thinking about buying a kiln for glass bottle slumping, it’s important to consider the size of the bottles and molds you are planning to use, before you buy it. Unfortunately, it’s not that easy as the long shape of glass bottles and molds make them hard to fit into many of the standard smaller, household current kilns.

It’s like the Goldilocks syndrome… this one is too small, this one is too big but, this one is just right. So, with that mind, Paragon Industries accepted the challenge to create the perfect bottle slumping kiln. They recognized that most people who want to slump bottles want a kiln big enough to efficiently slump multiple wine and/or beer bottles at the same time. And, most don’t have a 240v electrical circuit available, so they need the kiln to run on regular 120v household current.

With those specifications as their guidelines… the rectangular Paragon Fusion 17 was born! And, is the only kiln specifically created for glass bottle slumping!

Now that you have the perfect kiln, here are some tips to help you make your glass bottle slumping experience more successful:

Remove labels. From washing soda to ammonia, there are many options when it comes to removing labels from bottles. Most involve hot water and soaking from a couple hours to overnight. After the label has been removed, remember to wash the bottles thoroughly under cold water to remove any residue. Many people also use isopropyl alcohol to clean fingerprints as cleaning the glass is critical to your success!

Keep a log. Bottles come in diverse shapes, sizes and glass properties. Thicker bottles will take longer to heat and slump. Different shaped bottles will slump differently and at different rates. Different glass may have different melting temperatures. We suggest keeping a log of your firing. You may see some patterns that will help you get more consistent results.

Be prepared to adjust. It’s uncommon that a generic firing schedule will get you the perfect results without some modification. And, there are a million factors that can impact the temperature… maybe you loaded your kiln with more bottles, so it will take longer to heat. Or, like your oven, some kilns just run hot, while others run cold. Whatever the cause, you will need to adjust some parts of the firing schedule to get the best results from your kiln.

Fusing bottles together. Glass compatibility, also referred to the coefficient of expansion or COE, is important to understand if you are going to be successful with glass bottle slumping. If you don’t use glass that has the same compatibility or COE, the stress will cause it to crack or break. Sometimes it happens immediately or sometimes is happens later. but, I can 100% guarantee that it will happen. Most bottles tend to be in the 82-86 COE range which is similar to float or window glass. However, since the COE of any given bottle glass is unknown, it is not recommended to fuse them with other bottles or fusible glass.

So I decided to melt glass beer bottles with a friend and we were able to melt it to the point where we could shape it, but once we took the blow torch away and let it cool, the bottle would crack and break almost every time. Anyone know anything about glass and may be able to help us make cool stuff without it cracking?

5 Answers

When glass is melted and cooled fairly quickly, it builds up considerable stress between the stiff outer skin and still soft inner layers. The thicker the glass, the more likely this is to happen. So glass has to be brought down to the point where it will hold its shape, about 1000F and held there to allow the stresses to even out, then cooled slowly to not introduce new stresses.

The first answer just barely works, depending on the thickness, and is used by bead makers with small beads. Burying the glass while hot in vermiculite (the stuff from garden centers) helps as does using ceramic blanket (fiberglass will stick to your glass if yours is too hot.)

But the true answer is that you need an annealer/kiln that will go to about 1000F degrees – although if you were gutsy, you might build a fire in a mostly enclosed box, build up the heat and put the glass and seal the box and let it cool off.

I don’t think so. Mirrors are first a piece of float glass that is made by melting glass in a puddle of molten tin inside of a kiln. The glass is then aluminized on the rear inside of a vacuum chamber. I’ve done a little work with glass, and I can’t imagine doing a welded repair,which would then have to be ground and polished with a series of grits and then re-aluminized. I’m pretty sure it would be much cheaper to replace it, no matter how special a mirror it was. Sorry. BW, GH

You have to slow down the rate of cooling. After you have got the shape you want, use the torch to keep it warm and very slowly back it out. This will keep the glass from cracking if done right. You may have to try several times to get it right, but the effort would be worth it.

Melted Beer Bottles

Look up how to anneal glass. You may want to experiment with an insulating (and not inflammable) blanket like one made from ceramic fiber. The other alternative is using an oven for annealing.

HAVE YOU EVER WONDERED ABOUT FIRING GLASS IN YOUR KILN?

Kiln-fired glass, or warm glass as it is also called, is typically done in an electric kiln at temperatures lower than ceramic temperatures. 1300-1500 degrees F is typical. For reference, Cone 04 is about 1900 degrees F and Cone 10 is about 2350.

Because of the lower temperatures involved, all ceramic kilns are capable of firing glass. However, electronic controllers are particularly useful for glass firings, as the temperatures have to be controlled precisely during certain stages of firing.

Glass kilns usually have an element in the lid. This is especially important for glass fusing, where different pieces of glass are combined into a single agglomeration by heating them to the point where they soften, and a flow of material occurs across each piece. During fusing, the lid element is turned on high so even heating occurs across the glass piece.

If you’re doing small pieces of glass, a lid element is not crucial for fusing. If you’re making jewelry for example, the small tabletop kilns without lid elements work fine. But the larger your pieces get, the more difficult it gets to do without a lid element.

It also is extremely useful to see inside glass kilns, so windows are a great help.

Slumping (melting the glass into a mold) does not need the element to be in the lid. So if all you’re doing is slumping, such as wine bottles or already fused sheets of glass, any ceramic kiln will be fine.

USING A CERAMIC KILN FOR FIRING GLASS

If you plan to do a fair amount of glass and ceramic work, then your best option for a kiln would be a dual-media kiln which is designed for both. These are the most popular:

If you are a serious glass artist, you probably will want a separate kiln for ceramic and glass. This will allow you to optimize features for each one. Paragon is the most popular brand of glass kiln, and has a variety of styles to choose from.

FOR MORE INFORMATION

The website has a lot of great information.

We also have a number of new books on kiln-formed glass.

A FUN GLASS PROJECT

A fun project is to take a beer or wine bottle and slump it into a “spoon rest.” Make sure you have a lot of kiln wash on your shelf. I personally would try this first inside a ceramic bowl, just to be safe. Make sure you have the bottle where you can see it through your spy hole. Heat the kiln at about 250 degrees F per hour. The bottle will probably start to slump at 1000-1100 degrees F, and be pretty flattened by 1200 degrees F. You can also add a lump of clay (dry greenware or bisque) beneath the neck of the bottle, and it will form over the lump and make a nice handle. Cooling the kiln fast down to about 850 degrees F will probably result in the clearest glass. Then cool very slowly

Here is an image of a bottle slumped into a serving tray. To give proper credit, this nice looking item is sold at a web site called She-Works.com. Item # G-901.

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Written by: Lennon Simpson

Written on: July 14, 2020

Zyuzin Andriy/iStock/Getty Images

For whatever reason you might want to, you can melt a beer bottle relatively easily at your own house. The process centres around creating a hot spot on the glasses surface and then allowing the microwave to finish the job.

Melting glass is extremely hot and this process can be hazardous, so proceed with caution

Remove the revolving glass tray and the plastic guiding ring from the microwave and place the bottle upright in the back.

Heat the bottle slowly in a wide general area with the blow torch. This prevents temperature shock, which could shatter the glass

Begin focusing a tiny area with the blow torch while periodically heating the rest of the area. Get this small area to start glowing red hot.

• For whatever reason you might want to, you can melt a beer bottle relatively easily at your own house.
• This prevents temperature shock, which could shatter the glass Begin focusing a tiny area with the blow torch while periodically heating the rest of the area.

Close the microwave and set on high for an extended period of time, around 10 to 15 minutes.

Once you are finished, allow the bottle to cool inside the microwave; the rapid cooling it will undergo if removed will cause it to shatter.

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i hawe a few normal drill bits and a propane/mapp gas torch.

Discussions

A glass drill under running water works great if you want to make a hole.
I have used it on my terrariums and that glass is not especially sturdy.
But no problems.

A jet torch will easily get a bottle to malleable temperatures, poking it through once it’s soft would probably be the best way to make the hole. slowly let it cool by heating it less and less or it’ll shatter while cooling down.

Reply 4 months ago

What are you going to poke it with?
Melting glass sticks to every kind of metal except titanium.
Best thing is to get a glass hole saw. Like a drill bit only better for making holes in glass.
Just do your drilling in a sink so that you can have water running over the area your drilling to keep it from getting hot and shattering. You can also put a piece of wet paper towel in the hole saw to keep it cool.
Drill a perfect whole in seconds.

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Written by: Brandy Alexander

Written on: July 14, 2020

Ryan McVay/Digital Vision/Getty Images

You can create intriguing art by melting bottles flat. You can use these flattened vessels as cheese platters or paint or hang them to create original art projects. Using a kiln, you heat the bottle to extremely high temperatures and melt (slump) the glass to get the shape that you want.

This process may take some practice, as not all kilns perform the same, so it is best to take your time and have several bottles on hand to practice with.

Before slumping

• Use a hair dryer to heat and peel the bottle’s label off.
• Spray the bottle with a devitrification spray, such as Fusemaster Superspray, to keep the glass from getting a cloudy or bubbly appearance.

Use a hair dryer to heat and peel the bottle’s label off. Alternatively, place the bottle in a container of warm water, so that it can soak for a few minutes, and then scrape it off.

Clean the remainder of the bottle with soap and water and allow it to dry.

Spray the bottle with a devitrification spray, such as Fusemaster Superspray, to keep the glass from getting a cloudy or bubbly appearance.

Place fibre paper or kiln wash, available at ceramic and glass art suppliers, on your kiln shelf. This will keep the glass from sticking to the kiln when it melts.

Slumping the bottle

• Place the bottle on its side and, if desired, stick a piece of 20 gauge twisted copper wire inside the neck.
• Once reached, increase the temperature to 801 C (1475 F), as fast as the kiln can attain this point.

Place the bottle on its side and, if desired, stick a piece of 20 gauge twisted copper wire inside the neck. This wire becomes attached to the bottle and allows you to form it into a loop to hang the flattened bottle as a glass art piece.

Set the kiln temperature to 593 degrees Celsius (1100 degrees Fahrenheit) and hold this setting for 10 minutes. This holding time allows the complete bottle area to absorb the heat.

Raise the kiln temperature 121 degrees C (250 degrees F) per hour until it reaches 704 C (1300 F). Once reached, increase the temperature to 801 C (1475 F), as fast as the kiln can attain this point.

Keep the setting at 801 C (1475 F) until the bottle has melted (slumped) as much as you want it to. Use your kiln’s viewing window to check the bottle or else quickly open the door to see the level of flatness. It typically takes 10 minutes at 801 C (1475 F) for the bottle to go completely flat.

Quickly lower the temperature to 593C (1100 F). The fastest way is to open the door (flash vent), so that the internal kiln temperature drops rapidly.

Cool the kiln back down to room temperature, at a rate of 65.6 degrees C (150 degrees F) per hour or slower, to anneal the glass. If there is a digital controller on your kiln, you can set an anneal program to meet this requirement. Otherwise, closely watch the progress to manually adjust the temperature, as necessary.

Remove your flattened bottle and make sure there is no kiln wash sticking to the body. If there is, simply remove it with soapy water. The bottle is now ready to use for your art project.

Would like to use wine bottles for decoration. How can they be melted without a kiln.

Can’t. Glass has a melting temperature of around 1400-1600°C , and most household ovens top out at around 500 degrees so no, you cannot melt glass without a kiln.

We’ve throw bottles into fire pit & melted them not uniformly. You can buy microwave home kilns but complete wine bottle would not fit in one. you can make backyard kiln DIY easy low cost Another

I use a berns-o-matic torch. Support the neck from above and move the flame around the area you want to soften

You need a kiln, I would worry about them breaking using any other method.

there are microwave kilns that are apparently used for fused glass. I have never used one but they are inexpensive on Amazon

You can use a pottery kiln to melt glass and change it into beautiful decorative pieces to use in jewelry and glassware. The glass that is melted in a pottery kiln can be recycled from bottles to broken glassware. The cost of a home kiln will range in price from about $4,000 to $10,000. If you would rather, consider having the glass melted at a craft center or in the kiln owned by a friend or family member. Follow the simple steps below to complete this creative project.

Step 1 – Gathering Your Glass

Gather the glass you want to melt in the kiln. Crafting glass and old or broken bottles or glassware can be used.

Step 2 – Cleaning the Glass

Immerse the glass you are going to melt in warm, soapy water. Wash the glass to remove any residue that would also become melted in the kiln. Dry the glass once it is clean.

Step 3 – Choosing the Finished Design

Decide what you want to make with the glass. The finished design you choose will determine how you place the glass into the mold. There are two ways to place the glass into the kiln. The glass can be hung on copper wire over a mold so that when it melts, it will pour into the mold to create a specific design. Alternatively, the glass can be placed on the kiln shelf where it will melt without forming into a mold.

Step 4 – Priming the Kiln Shelf

Use a brush to apply layer of shelf primer to the shelf in the kiln. This will prevent the glass from becoming stuck to the shelf. Allow the primer enough time to dry completely.

Step 5 – Safety

Put on your fireproof apron, fireproof gloves and protective eye wear. Be sure your protective eye wear is heat resistant. Be extremely careful working with kiln to prevent serious burn injuries.

Step 6 – Positioning the Glass

Put the glass into the kiln using the method that will produce the results you desire. Either hang it on copper wire over a mold or place it on the kiln shelf where it will not need a mold.

Step 7 – Heating the Kiln

Turn on the power to the kiln, and heat to a temperature level of 1,000 degrees Fahrenheit. Leave the glass in the kiln at this temperature for 3 hours.

Step 8 – Raising the Heat Level

Increase the kiln temperature level to 1,300 degrees Fahrenheit. Leave the glass for 3 hours at this temperature.

Raise the temperature to fourteen 1,400 degrees. Leave the glass for another 4 hours.

Raise the temperature to 1,700 hundred degrees. Leave the glass at this temperature until it forms the desired shape.

Step 9 – Lowering the Heat Level

Decrease the kiln temperature level to 1,100 degrees. Decrease the kiln temperature to 800 degrees. Turn off the heat to the kiln. Allow the glass shapes to cool. Leave the glass in the kiln overnight until it reaches a room temperature level.

marbles, fishtank “beads” etc. how can i melt these and similar bits of glass without an actual kiln? is a blow torch hot enough?

4 Answers

There are two kinds of glass used for bead making soft and Pyrex or hard glass. The former can be melted and formed by using MAPP gas in a torch like the Hot Head while the latter requires a propane-oxygen torch. The whole process is called lampworking – try

You will eventually need a small kiln anyway because once things get beyond a certain thickness (about 1″ diameter, 1/2″ thick from mandrel) they must be annealed (cooled slowly) to keep them from cracking.

More clues, sites, and books

Glass is made up of many different compounds depending on what it is used for, but here is a general range:

All of these suggest a melting point of 1400 degrees Centigrade or higher. According to wikipedia a propane torch can get to around 2000 degrees centigrade or higher if there is pure oxygen in the mix:

So the answer is probably yes, but it will depend on the heat of your torch specifically and the composition of the glass you’re using. Be careful and have fun!

Not really sure but – if you can get a melt and blow glass on a Bunsen Burner ( which I did as a schoolbiy ) I would have thought it would melt over the gas.

Get an old pan and give it a try .

how do you melt stained glass pieces