the feature of high borosilicate glass:expasion coefficient is 3.3,can adpat to 200 degrees temperature change.hesistance of 600 Main material of the baby feeder:1.Nipple:FDA,REACH approved silica gel,health friendly2.Plastic part:food grade PP,100 C available3.Bottle:3.3 borosilicate glass,which can pass thermal test,free of BPA