Website Help System

What is a Cookie?

A Cookie is a very small text file placed on your hard drive by a Web Page server.

  • It is essentially your identification card, and cannot be executed as code or deliver viruses.
  • It is uniquely yours and can only be read by the server that gave the cookie to you. Cookies, by themselves, do not tell us your e-mail address or other personally identifiable information unless you choose to provide this information by registering on our site. However, once you choose to furnish personally identifiable information, this information may be linked to, and stored in, your cookie.
  • At no time can this information be accessed by anyone other than Sigma-Aldrich.com Web development team.

We use cookies to understand site usage and to improve the content and offerings on our site. For example, we may use cookies to personalize your experience on our web site, e.g. to recognize you by name when you return to our site.

We also use Cookies to help save you time by allowing us to remember your Areas of Interest and preferences without asking you each time you make a return visit.

Your Internet browser has settings that can allow or disallow cookies to be set on your machine. However, some areas of our site require "Cookies" and will not function properly if cookies are not allowed.