Privacy
This notice describes the current site. We will update it and the relevant settings if services or data handling change.
Calculator inputs
Calculations run in your browser. Some tools use browser sessionStorage to retain inputs when switching between Chinese and English. The material specimen index also stores its filter query in the tab session for language switching. Session data is normally cleared when the browser tab is closed; you can also clear site data in your browser settings.
Hosting and external links
Hosting and network providers may process technical information such as IP addresses, request times and requested resources to deliver and secure the site. External sites have their own privacy policies.
Contact
For privacy questions or site feedback, email 695662600@qq.com. Your sender address and message are processed by the email service provider and the site to receive and handle the feedback; the email service has its own privacy policy.
Advertising and analytics
Some responses on the production domain load a Cloudflare Web Analytics script for page-visit and performance measurement. Cloudflare may process technical information about visits and devices; the calculator code does not deliberately send entered values or results to analytics. See Cloudflare’s data collection information. The reserved area does not currently load ads; this notice will be updated before advertising is added.