These super duty beakers have greater mechanical stability compared to standard Duran™ glass beakers due to increased glass content. The reinforced rim also increases shock resistance and considerably reduces the risk of breakage. They provide maximum possible safety for users when working under mechanical load e.g., frequent cleaning. Uniform wall thickness distribution, and increased shock resistance extend their service life and make the glass containers more economical. Uniform and slow heating is recommended. Standard beakers should be used when working at very high temperatures or if rapid temperature changes are expected. Made with Duran™ glass.