I used a standard 17'x11' size. First thing you want to do is spray the crap out of your sheet with cooking spray. This will allow the glass to come out of the mold when dry. Now once your sugar glass mix comes off the stove it will start to dry fast. So don't wait long to pour. Go slow making sure to spread the mix evenly across the mold. At a 3-1 ratio of baking soda-cocaine, put in a glass dish, preferably pyrex obviously, and add water just enough to saturate the coke and dissolve it. Microwave for around 2 minutes depending on amount. Some say bring it to a boil but dont risk it because 'itll overcook the yell and then it wont sell'. The temp of a steamy shower is perfect. Pull it out the microwave, add drops of cold water. Stir with a fork. Cracked desktop screen image to prank your friends. Open this page on the phone of your victim and watch his reaction:).

Spontaneous glass breakage is a phenomenon by which toughened glass (or tempered) may spontaneously break without any apparent reason.

Common causes[edit]

The most common causes are:

• Minor damage during installation such as nicked or chipped edges later developing into larger breaks normally radiating from point of defect.
• Binding of the glass in the frame, causing stresses to develop as the glass expands and contracts due to thermal changes or deflects due to wind
• Internal defects within the glass such as nickel sulfide inclusions
• Thermal stresses in the glass
• Inadequate glass thickness to resist wind load

Installation damage[edit]

While glass is being moved and installed, it is easy for the glaziers to nick or chip the edges of the glass with various tools. It is also possible for fasteners such as nails or screws used to attach glass stops to nick the glass edges if these fasteners are installed at an improper angle. These small nicks or chips may not result in immediate breakage. However, over time, as the glass expands and contracts, stress concentrations can develop around the nick, leading to breakage. In the case of tempered glass the entire unit usually breaks.

Binding in the frame[edit]

Glass expands and contracts with changes in temperature and deflects due to wind, so almost all modern glass is set on resilient blocks at the bottom and with space for expansion at the sides and top. The gaskets holding the glass in the frame are also usually resilient to cushion the glass against wind buffeting. If no space is provided at the perimeter of the unit, the glass will bind against the frame, causing internal stresses to develop in the glass which can exceed the strength of glass, resulting in breakage.

Internal defects and inclusions in the glass[edit]

Types Of Cracks In Glass

Nickel sulfide inclusions ('stones') can be present in the glass. The most common cause of these inclusions is the use of stainless-steel machinery in the glassmaking and handling process. Small shavings of stainless steel containing nickel change structure over time and grow, creating internal stresses in the glass. When these stresses exceed the strength of the glass, breakage results. This type of breakage is almost always found in tempered glass and is indicated by a distinctive 'figure eight' pattern, with each 'loop' of the figure eight approximately 30 mm in diameter.

Alternatively, small pieces of refractory brick can be eroded by the molten glass from the internal walls of the furnace during processing and become embedded in the finished glass. These are also known as 'stones', and can also break the glass when the glass is heated, as they create thermal anomalies.

Thermal stresses[edit]

Breakage due to thermal stress is most common in large pieces of sealed insulating glass with heavy heat-absorbing (reflective) coatings. The coating is usually applied to the 'number two' surface (the inside face of the outside lite). This causes the outside lite of glass to heat up more than the inside lite as the coating converts radiant heat from the Sun into sensible heat. As the outer lite expands due to heating, the entire unit bends outward. If the spacer bar or other edge condition connects the two lites of glass in a very rigid manner, bending stresses can develop which exceed the strength of the glass, causing breakage. This was the cause of extensive glass breakage at the John Hancock Tower in Boston.

Inadequate glass thickness[edit]

A pane that is too large or thin, having not been properly engineered for wind loads on the site, can be broken by the wind. See Bernoulli's principle on wind.

Remedies[edit]

Any breakage problem has more severe consequences where the glass is installed overhead or in public areas (such as in high-rise buildings). A safety window film can be applied to the tempered panes of glass to protect from its falling. An old-fashioned precaution was to install metal screens below skylights.

References[edit]

Size Of A Shot Glass

American Society for Testing and Materials (ASTM)

ASTM E 2431 -- Practice for Determining the Resistance of Single Glazed Annealed Architectural Flat Glass to Thermal Loadings.

ASTM E1300 -- Standard Design Practice for Determining Load Resistance of Glass in Buildings.

Repair a cracked window, glass tabletop, or even a mirror with this easy step-by-step guide.

Fill In Cracks In Glass

Photo: istockphoto.com

A pebble from the lawnmower tossed against a window. A drink set down too heavily on your glass-topped coffee table. A favorite vase tipped over by your curious cat. These and near-endless other scenarios can lead to a crack in glass. Sadly, glass that has broken into pieces or has cracks larger than an inch, as well as double-paned glass with a hole through both panes, is pretty much beyond repair.

The good news is you can often fix a small crack in glass yourself with little more than a steady hand and a few basic supplies. You’ll need to fix a crack in glass right away, however, as small ones can grow into larger breaks if exposed to moisture, temperature swings, dirt, or rough treatment.

Before you begin, note:

• The following guide on how to repair a crack in glass will do the job for single-pane-glass household items. This includes tabletops, shower doors, vases, and single-pane windows—as well as double-pane windows with a crack in only one of the panes. It’s not intended for repairing a cracked car windshield, which requires a syringe to inject resin into the crack and a plunger to maintain the vacuum between the windshield’s layers of glass.

• While you can fix a cracked mirror with this technique, the reflection is bound to show the repair a bit more than on regular glass. You’ll get best results with a minor crack on the sides of a mirror, out of the direct line of vision.

Photo: istockphoto.com

STEP 1: Clean the glass with dish soap.

Wash the glass around the crack with a drop or two of dishwashing soap on a damp cloth. You’ll want to remove any dust, oil, or fingerprints, and then wipe the spot with a clean damp cloth to remove the soap residue. Let the glass dry completely.

STEP 2: Mix up the two-part epoxy.

In a well-ventilated area, prepare a two-part epoxy on a piece of cardboard or a disposable plate. These adhesives (which can found in many craft stores, home improvement centers, or on Amazon.com) have a separate resin and hardener that are mixed together at the time of use.

RELATED: The Right Glue for Every Repair Job

Photo: amazon.com via Gorilla Glue

Fix Cracks In Glass

While the mixture is often a 50/50 blend of the resin and the hardener, follow the directions on your specific product. Use a toothpick to mix the epoxy for at least 20 seconds. Once the epoxy is mixed, be ready to use it immediately, as it will quickly thicken and harden. Generally, you’ll have five to ten minutes of working time before the epoxy is too thick to easily seep into the crack.

STEP 3: Apply the epoxy to the crack in the glass using a putty knife.

Press the epoxy over and into the crack with a putty knife. Work the adhesive back and forth across the crack, gently pressing it into the damaged area. Let the epoxy cure for at least five minutes.

Making Crack In A Shot Glasses

STEP 4: Remove excess epoxy with a razor blade and let the rest cure.

Scrape away excess epoxy with a razor blade, and then wipe the area with a clean rag moistened with acetone to further remove epoxy that’s raised above the crack. Let the repaired glass cure for 24 hours.

STEP 5: Spiff up the surface with a glass cleaner.

Polish the glass with a clean rag and glass cleaner, and enjoy your repaired item.