This question was asked in our recent customer survey.

Modern ampoules do not require a glass knife as they are easy to open using the plastic breaker supplied. The neck is scored around the constriction and should snap open easily and safely.

As we have products dating back to the 1950’s, some are supplied in old style ampoules with no scoring or constriction. For these products we provide instructions on opening and a metal ampoule opener. BEFORE using the opener it is necessary to score the neck with a glass knife.

For many years we were able to supply a small glass knife free of charge with each ampoule but these are no longer manufactured and replacements are too expensive for us to supply free of charge with each ampoule.  Suitable glass knives are available cheaply from most laboratory suppliers.