 
        | Main centres: | 1-3 business days | 
| Regional areas: | 3-4 business days | 
| Remote areas: | 3-5 business days | 
Blackwell Products Glass Test Tube (with Rim) plain glass round bottom tubes that are made of borosilicate glass to reduce pH change and contaminants potentially leached from soda-lime glass. The tubes are well annealed, resistant to heat and are chemically stable. Glass Test Tubes with rims are fire-polish.
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