TGA pans, also known as alumina crucibles, are made of 99.8% pure aluminum oxide. Cleaning them can be a challenge, especially when dealing with stubborn residue or stains. The key to effectively cleaning TGA pans is to use the right techniques and chemicals while also considering the type of contamination. Various methods can be employed, including mechanical cleansing, boiling in water, soaking in acids, and using specialised cleaners. The choice of method depends on the nature of the contamination and the desired level of cleanliness.
What You'll Learn
Soak in aqua regia for 24 hours, then rinse, dry and heat
To clean TGA pans, one method is to soak them in aqua regia for 24 hours, then rinse, dry, and heat. This is a detailed, step-by-step guide to this process.
Firstly, it is important to understand what aqua regia is and how to handle it safely. Aqua regia is a highly corrosive mixture of nitric acid and hydrochloric acid, typically in a 1:3 molar ratio. The acids should be mixed just before use, as aqua regia quickly loses its potency due to the volatility of its chemical reactions. It is a fuming liquid that is initially colourless but quickly turns yellow and then red. It is used to dissolve noble metals such as gold and platinum.
When handling aqua regia, it is essential to take the utmost care. Both hydrochloric and nitric acid are extremely corrosive and reactive. Be sure to read the Safety Data Sheets (SDS) for both chemicals before use.
To begin cleaning your TGA pans with aqua regia, first, prepare the mixture of nitric acid and hydrochloric acid in the correct ratio. Fully submerge the pans in the aqua regia solution and allow them to soak for 24 hours. After this time, remove the pans from the solution and thoroughly rinse them with water to remove any remaining acid.
Next, dry the pans. This can be done by allowing them to air dry or by using a cloth or paper towel to absorb any remaining water. It is important that the pans are completely dry before the next step.
Finally, heat the pans to a high temperature. One source suggests heating to "red hot," while another recommends 500°C for a few hours. This step ensures that any remaining weight is lost and that the pans are ready for reuse.
This method of cleaning TGA pans is an effective way to remove any oxides and residues, but it is important to prioritise safety when working with such corrosive chemicals.
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Use a non-acid aluminium coil cleaner and brightener
T-Fal pans are made from anodized aluminum and are both durable and safe to use. They are also non-stick, which makes them easier to clean than other pans. However, removing food stains or burn marks can be more difficult.
To clean your T-Fal pan, you should start by filling it with water until the stuck-on food debris is covered. Next, add a cup of vinegar and place the pan on the stove. Turn on the burner and bring the mixture to a boil. Once the water starts bubbling, remove the pan from the heat and add 2 tablespoons of baking soda. Mix the solution, then empty the contents of the pan into the sink. Finally, use a cloth, sponge, or non-abrasive scrubber to remove any remaining food debris.
If your T-Fal pan has burn marks, you can use a non-acid aluminium coil cleaner and brightener to remove them. Non-acid coil cleaners are heavy-duty professional cleaners that are safe to use on aluminum surfaces. They are designed to remove dirt and grime without causing damage, as can be the case with acidic cleaners.
To use a non-acid coil cleaner, start by applying the product to the affected area of the pan. Some non-acid coil cleaners come in the form of a spray, while others may need to be applied with a cloth or sponge. Allow the cleaner to sit on the surface of the pan for a few minutes, giving it time to penetrate the grime. Then, use a soft cloth or sponge to gently wipe away the dirt and burn marks. Rinse the pan with warm water and dry it thoroughly with a soft cloth.
It is important to note that you should always wear protective gloves and eye protection when handling any cleaning chemicals. Always read the instructions on the product label and follow the recommended safety precautions.
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Soak in boiling water, then wash and soak in 10% HCl for 24 hours
To clean TGA pans, one method suggests the following steps:
Firstly, fill the pan with water and bring it to a boil. Allow the water to boil for 5-7 minutes. The steam will help loosen any food residue stuck to the sides of the pan. After this, pour out the hot water and wipe away any remaining food particles with a sponge.
Next, fill the pan with boiling water again and let it soak for 15-20 minutes. If you didn't have the chance to soak the pan immediately after cooking, you can add hot water and let it soak overnight.
After this, the pan should be washed as normal with soap and warm water. Use a sponge or washcloth to scrub the surface of the pan and remove any remaining food particles. Rinse the pan again and dry it with a clean towel.
For particularly burnt-on or stubborn food residue, a mixture of vinegar and baking soda can be used. Mix two tablespoons of white vinegar with baking soda and a small amount of water in the pan. Place the pan on the stove and heat the mixture, allowing it to boil for up to 5 minutes. Stir the mixture occasionally. After 5 minutes, remove the pan from the heat and let it cool down. Rinse the pan with warm water and wash it out with a sponge and dish soap. Finally, dry the pan.
Another method for cleaning TGA pans involves a more chemical approach. This method suggests that after mechanical cleansing, the pan should be soaked in boiling water for a sufficient period. After this, wash the pan and then soak it in 10% HCl for over 24 hours. During this time, if the pan is used in TGA, the layer of metal oxides will stick to the pan. Over time, these oxides will change into soluble chlorides that can be easily rinsed off. After 24 hours, rinse, dry the pan, and heat it to red hot to ensure no weight is lost when the pan is reused.
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Use mechanical cleansing
T-Fal makes both nonstick and stainless-steel pans that are safe and easy to clean. Here are some tips for mechanical cleaning of T-Fal pans:
For Nonstick Pans:
- Wait for the pan to cool down before cleaning.
- Use a soft cloth or sponge with warm, soapy water to clean the pan.
- For stubborn food debris, use a cleaner labelled "safe for nonstick surfaces", but not abrasive steel wool pads, harsh cleansers, or oven cleaners.
- Do not put non-stick pans in the dishwasher as it can cause warping and strip away the non-stick coating.
For Stainless Steel Pans:
- Start by immersing dirty pans in hot water.
- Create a paste by mixing powder cleanser with water.
- Apply the paste using a soft cloth, sponge, or nylon scrubbing pad in a circular motion.
- Rinse the pan with soapy, hot water and hand dry. Do not leave the pan to air dry.
- If your pan has copper in its band or bottom, use a copper cleaner to restore its shine.
- Do not use chlorine bleach cleansers or oven cleaners on stainless steel pans.
- Avoid using steel wool scouring pads or brushes as they can cause the pan to become dull, scratched, or discoloured over time.
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Soak in dilute sulphuric acid for 5-10 hours
To clean TGA pans, it is recommended that you soak them in a dilute solution of sulphuric acid for 5-10 hours. Sulphuric acid is a highly corrosive mineral acid that is often used to clean materials such as platinum crucibles. When diluting sulphuric acid with water, it is important to carefully control the process as the mixture can reach temperatures of over 145°C due to its high exothermic heat of dilution. This could result in the boiling of the mixture.
To ensure safety when handling and storing sulphuric acid, it is important to take into account the corrosive nature of the substance, as well as the high process temperatures. The acid dilution process should be carefully monitored to control the solution's density and temperature. Additionally, the use of thermoplastics in blending, dilution, and cooling systems can help address corrosion and heat challenges.
By following the recommended procedure of soaking TGA pans in dilute sulphuric acid for 5-10 hours, you can effectively clean the pans while also ensuring safety by carefully managing the dilution process.
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