Nickel Crucibles
The melting point of nickel is 1455°C, and it has strong resistance to alkali and corrosion. Nickel crucibles are commonly used for melting iron alloys, slag, clay, refractory materials, etc.
When using a nickel crucible, the sample temperature should not exceed 700°C because nickel can be easily oxidized at high temperatures.
Nickel crucibles cannot be used for burning precipitates.
Nickel crucibles are suitable for fusing samples with alkaline solvents such as sodium hydroxide, peroxide, carbonate, bicarbonate, and potassium nitrate. They are unsuitable for acidic solvents like potassium hydrogen sulfate or sodium hydrogen sulfate, potassium pyrosulfate or sodium pyrosulfate, and sulfur-containing alkaline sulfides.
Molten salts of aluminum, zinc, lead, tin, mercury, and other metals can make nickel crucibles brittle. Borax cannot be melted in nickel crucibles either.
Nickel crucibles often contain trace amounts of chromium, which should be noted during use.
New nickel crucibles should first be burned in a muffle furnace until they turn blue-purple to remove surface oil stains. Then, they should be boiled briefly with a 1:20 HCl solution and rinsed clean with water.
Alkaline fluxes can be fused in nickel crucibles, generally not exceeding 700°C. Sodium oxide can also be fused in nickel crucibles, but the temperature should be below 500°C and the time short; otherwise, severe erosion will occur, increasing the nickel salt content in the solution and making it an impurity in the analysis.
Acidic solvents and sulfur-containing solvents cannot be used in nickel crucibles. If sulfur compounds need to be fused, it should be done under conditions with excess sodium peroxide. Molten salts of aluminum, zinc, tin, lead, and other metals can make nickel crucibles brittle. Compounds of silver, mercury, vanadium, and borax cannot be burned in nickel crucibles. Nickel dissolves easily in acid, so acid should not be used when leaching molten blocks. A new nickel crucible should be burned at 700°C for several minutes before use to remove oil stains and form an oxide film on its surface, extending its service life. After treatment, the crucible should appear dark green or gray-black. Before each use, it should be washed by boiling in water. If necessary, a small amount of hydrochloric acid can be added and boiled briefly, then washed with distilled water and dried for use.
Return Policy
1. Scope of Application
• This return policy applies to all products purchased through the INDCUSTOM online store, unless explicitly stated as non-returnable in the product description.
2. Conditions for Returns
• Items must be returned within 14 days of receipt.
• The product should be unused, in its original condition, with all tags and packaging intact.
• Custom-made or personalized items are not eligible for returns.
3. Exchange Conditions
• Exchanges can be requested within 30 days of receiving the item. the international return shipping costs will be borne by the buyer.
4. Refund Process
• Submit a return request via INDCUSTOM’s customer service center, including your order number and reason for return.
• Upon approval, we will provide you with a return address and shipping instructions.
• Refunds will be processed within 5 business days of receiving and inspecting the returned item, and will be credited back to the original payment method.
5. Important Notes
• Once a returned item is confirmed to be in acceptable condition, the refund will be issued minus any applicable taxes and shipping fees.
• Certain items may be subject to specific return terms, which will be outlined on the product detail page.
Shipping Policy
1. Shipping Time
• Orders are prepared for shipment within 72 hours of confirmation. Customized orders may have different shipping times.
• Holidays may lead to delays in shipping.
2. Shipping Fees and Delivery Options
• International Standard Shipping: Shipping fees are calculated based on destination and package weight, and will be displayed at checkout.
• Expedited Shipping: Additional charges apply, based on destination and package weight.
• We partner with various international shipping companies to offer global delivery services.
3. Delivery Times
• International Standard Shipping: Expected delivery time ranges from 7 to 21 business days, depending on the destination.
• Expedited Shipping: Expected delivery time is between 3 to 7 business days, subject to destination specifics.
4. Tracking Information
• After shipment, you will receive an email containing tracking information.
• You can track your package status using the provided tracking number on the shipping company’s official website.
5. Receiving Guidelines
• Upon receipt of the goods, please check if the package is undamaged. In case of visible damage, take photos for evidence and contact our customer service.
• If the package is found damaged or the quantity does not match upon delivery, refuse acceptance and promptly inform us.
6. Taxes and Customs Clearance
• Import duties, VAT, and other import-related fees are the responsibility of the recipient.
• INDCUSTOM will assist in providing necessary customs clearance documents, but the ultimate responsibility lies with the buyer.