Asked By: Alex Garcia Date: created: Mar 09 2021
What causes crazing in plastics
Answered By: Daniel Richardson Date: created: Mar 11 2021
Crazing develops when excessive tensile stress is applied to a polymer, leading to microvoid formation in a plane normal to the stress.
The voids initiate at microscopic inhomogeneities in the polymer, and are stabilised by fibrils of plastically deformed polymer chains..
Asked By: Graham Watson Date: created: Nov 03 2021
How do you stop crazing cracks
Answered By: Antonio Morgan Date: created: Nov 04 2021
To prevent crazing start curing the concrete as soon as possible. The surface should be kept wet by either flooding the surface with water or, covering the surface with damp burlap and keeping it continuously moist for a minimum of 3 days or, spraying the surface with a liquid membrane curing compound.
Asked By: Abraham Brooks Date: created: Jul 27 2021
Why does crazing happen
Answered By: George Bell Date: created: Jul 29 2021
Crazing refers to small hairline cracks in glazed surfaces that usually appear after firing but can appear years later. It is caused by a mismatch in the thermal expansions of glaze and body. … Crazing appears when ceramic is cooled and the glaze shrinks more than the clay to which it is rigidly attached.
Asked By: Oswald Jones Date: created: Sep 04 2021
How long will concrete last before cracking
Answered By: Cameron Mitchell Date: created: Sep 04 2021
As the shrinkage begins, the concrete will crack where it is the weakest. Cracking typically starts within 12 hours of the finishing process. Weather conditions will slow or accelerate it. Shrinkage cracking is typically planned for and handled with control joints.
Asked By: Curtis Rodriguez Date: created: Mar 16 2022
Is it safe to use dishes with cracked glaze
Answered By: Blake Thompson Date: created: Mar 16 2022
Glazed ware can be a safety hazard to end users because it may leach metals into food and drink, it could harbor bacteria and it could flake of in knife-edged pieces. Crazed ceramic glazes have a network of cracks. … And you can add hazards (to you and customers of your ware) by the way you use them.
Asked By: Wallace Lopez Date: created: Feb 14 2022
What is paint crazing
Answered By: Bruce Watson Date: created: Feb 16 2022
Answer: Crazing is a condition in which hairline cracks develop in the clear coat of two-stage paints, which are widely used on both domestic and imported cars. Two-stage paints have a color coat and a clear coat of paint, in addition to a primer coat on the bare metal.
Asked By: Donald Nelson Date: created: Mar 07 2022
How do I stop crazing cracks in concrete
Answered By: Alfred Patterson Date: created: Mar 07 2022
Concrete contractors can minimize or prevent craze cracks by starting to cure as soon as possible after final finishing, especially on a hard-troweled floor. Moist curing is best, although a spray-on monomolecular curing compound also can be effective. Using a drier, stiffer mix can reduce crazing as well.
Asked By: Ian Smith Date: created: Jan 18 2021
Can you fix crazing
Answered By: Peter Murphy Date: created: Jan 20 2021
Changing the clay body or firing temperature Others ways to correct crazing include changing to a different clay body that better fits the glaze, adding silica to the existing clay body, or increasing the firing temperature. In stoneware, the addition of silica sand to the clay body can help prevent crazing.
Asked By: Samuel Baker Date: created: Mar 29 2022
Does Refiring fix crazing
Answered By: Curtis Wilson Date: created: Mar 29 2022
Either the body expanding or the glaze shrinking can cause fine hairline cracking (crazing) to occur. Refiring to the proper cone will sometimes solve the problem. Firing to the proper cone number is critical to help eliminate crazing problems.
Asked By: Herbert Clark Date: created: Feb 14 2022
Is crazing safe
Answered By: Daniel Gonzalez Date: created: Feb 15 2022
Crazing is one of the most common problems related to glaze defects. It appears in the glazed surface of fired ware as a network of fine hairline cracks. The initial cracks are thicker, and filled in with finer cracks. … Crazing can make a food safe glaze unsafe and ruin the look of the piece.
Asked By: Lewis Wilson Date: created: Jan 30 2021
What is concrete crazing
Answered By: Jack Gray Date: created: Jan 30 2021
Crazing is the development of a network of fine ran- dom cracks or fissures on the surface of concrete or mortar caused by shrinkage of the surface layer. … Crazing cracks are sometimes referred to as shallow map or pattern cracking.
Asked By: Adam Jones Date: created: Jun 09 2021
Is it normal to have hairline cracks in concrete
Answered By: Fred Jenkins Date: created: Jun 10 2021
Hairline cracks in a concrete slab are rarely a cause for concern. They can be controlled, but not eliminated. A crack in a slab of 1/8 inch or less is typically a normal shrinkage crack and not a cause for concern.
Asked By: Lewis Martinez Date: created: May 21 2022
How do you stop crazing
Answered By: Hunter Peterson Date: created: May 24 2022
To reduce crazing:Increase silica and clay by 5% silica and 4% clay.Add 5% talc or zinc oxide.Substitute lithium feldspar for sodium feldspar.Substitute borate frit for high-alkaline frit.Apply glaze thinly.Increase firing temperature.
Asked By: Devin Barnes Date: created: Nov 12 2021
What is crazing on eyeglasses
Answered By: Alexander Alexander Date: created: Nov 13 2021
Crazing is a web of tiny cracks that can appear on the lenses of eyeglasses coated with an anti-reflective coating. Looking through crazed lenses can make your world appear blurry.
Asked By: Charles King Date: created: Apr 03 2022
How do you get rid of crazing
Answered By: Albert Wilson Date: created: Apr 04 2022
Crazing in Stoneware Glazes: Treating the Causes, Not the…Apply a thinner glaze coat. … Add increasing amounts of silica. … Remove some feldspar and line blend additions of silica. … Firing higher or over a longer time. … Add increments of 5% silica to the clay body. … Slow cool the glaze kiln, don’t open it until it is below 200°C (390°F) … Bisque higher if low fire glaze is not fitting.More items…
Asked By: Lawrence Patterson Date: created: Sep 16 2021
How do you repair concrete crazing
Answered By: Neil Powell Date: created: Sep 16 2021
The process is fairly simple and involves grinding off the top layer of concrete to leave a smooth, unblemished surface. The top is then sealed, protecting the slab. Once the process is complete, your concrete slab will be restored to its original look without losing any of its durability and strength.
Asked By: Graham Wright Date: created: Sep 27 2021
Does crazing reduce value
Answered By: Jesus Brooks Date: created: Sep 29 2021
The presence of crazing usually diminishes the value of objects but it can depend on the severity of the damage and rarity of the crazed piece.
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