Yes, you should be performing an internal study to show that your internal process that you have set up for seal-strength testing remains consistent.

This would hold true especially if multiple technicians are performing seal-strength testing. It would be very important to verify that the process is being performed identically, data generated by the multiple technicians remain consistent, and variability is kept to a minimum.

There are several good machine manufacturers in the industry that will meet the requirements of the ASTM standards. I would also suggest that you take the time to determine your critical criteria for your testing because you want to make sure you are not paying for additional equipment capabilities that you may or may not need.

Some of the more reputable manufacturers in industry for seal strength equipment are Instron, Test Resources, and Chatillon. Some of the more reputable manufacturers for bubble leak test equipment are TM Electronics and Carleton Technologies. There are also possibilities of designing your own source for air in performing this test.