It is the surface treatment that is so stable in water.

After 8 years of research and development, we developed a proprietary method of bonded a surface treatment to RSA™ Glass Vials that not only increases the hydrolytic stability but it is also more hydrophobic than most silanized vials. 

RSA Vials are a pristine surface and the chemical synthesis that is performed in each vial has an affinity for the borosilicate glass. The side that faces the diluent and samples is hydrophobic and is not hydrolyzed.

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