Unlike conventional PFA bottles, which are made by extrusion blow molding, Savillex has developed it’s own two stage molding process, called stretch blow molding. In the Savillex process, the first step is to mold a “pre-form” which is essentially a miniature bottle with the threaded opening of the final product. The pre-form is then placed in the final mold, heated and blown into the final shape. Because the threaded opening is molded separately, it can be produced much more precisely than in a conventional PFA bottle. This allowed Savillex to design in two key features: the lip profile eliminates drips and trapped liquid when pouring – a great safety feature, especially when used with HF. Also, the seal is so good that the bottle does not require any insert in the cap - other PFA bottles have a disk-shaped PTFE insert in the cap in order to make a tight seal. In the lab, the insert often gets dropped on the bench and contaminates the bottle contents when put back in the cap – or chemists discard the insert and the seal is compromised.
Another great advantage of the Savillex molding process is surface finish. The surface of a Savillex bottle is far smoother than any other PFA bottle as the images below clearly show. This significantly reduces the possibility of trace metal contamination being trapped on the surface. The surface is so smooth that droplets do not adhere to it: when the contents are poured out of a Savillex bottle, no droplets remain inside.
SEM images comparing surface finish of a Savillex PFA bottle (right) and a competitor's PFA bottle (left)
Compare the two photographs below showing cutaway sections of the neck of a competitor’s PFA bottle (left) and a Savillex bottle (right). The competitor’s bottle features indentations and ridges inside the neck that prevents smooth, even pouring and also traps liquid. By comparison, the neck of the Savillex bottle is straight, and in addition to the carefully designed shape of the lip, gives great control when pouring.
Cutaway neck section of a Savillex PFA bottle (right) and a competitor’s PFA bottle (left)
Cutaway neck section of a Savillex PFA bottle (right) and a competitor’s PFA bottle (left)
In addition to the easier pouring, which is a clear safety benefit, the Savillex bottle also allows the entire contents of the bottle to be poured out, with no trapped liquid remaining in the bottle. This reduces waste and also lowers the risk of cross contamination when the bottle is reused. Click on the video below to see liquid poured from both bottles. The competitor’s bottle is shown first, followed by the Savillex bottle.
PFA Bottle Pouring Comparison Video
Our own DetectionLimit grade high purity acids are supplied in a 500mL Savillex PFA bottle, ensuring that acid quality is maintained right up to the point of use.
Savillex manufactures all its PFA bottles only from the highest purity PFA. Savillex uses use only Daikin AP211SH and Dupont 440HP PFA resin.