The density is 2.51g/cm3, the Knoop hardness is HK 100 610kg/mm2, the Young's modulus is 82 x 103kN/mm2, and the Poisson's ratio is 0.21. These mechanical performance parameters indicate that K9 glass has good hardness and mechanical strength, making it suitable for optical instruments that need to withstand certain external forces.
In terms of thermal performance, the softening point of K9 glass is 719 ° C, annealing point is 657 ° C, strain point is 624 ° C, thermal conductivity is 1.1W/m. ° C, specific heat is 879J/kg. ° C, and thermal expansion coefficient is 7.1 × 10E-6/K. These parameters ensure the stability and reliability of K9 glass in temperature changing environments.
In terms of chemical properties, the hydrolysis resistance of K9 glass is level 2, acid resistance is level 1, and alkali resistance is level 2. These indicators demonstrate that K9 glass has good chemical stability and corrosion resistance, and is suitable for various harsh environments.
In summary, K9 optical glass is widely used in modern industry and high-tech fields due to its excellent optical, mechanical, thermal, and chemical properties, such as photography equipment, instrumentation, optical instruments, medical instruments, teaching instruments, special lighting fixtures, military products, and other high-end optical instruments and high-end crystal handicrafts.
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.