Raw Materials: Poly Scientific's products are manufactured according to (cGMP) Current Good Manufacturing Procedure by the FDA. Poly Scientific offers the highest quality products. We can assure you of this because our raw materials are of the utmost superiority. All stains are certified by BSC and our chemicals are ACS or USP grade. Poly Scientific is so confident in our products that we unconditionally guarantee them, providing they are stored properly and are opened within a timely manner. Packaging: Poly Scientific uses fluorinated bottles. This process makes it safe to package acetone and xylene products in plastic containers without worrying that the container will panel after prolonged contact. Flourination reduces permeation up to one thousand times. An induction seal eliminates active ingredient loss and helps maintain the stability of the chemicals. An induction seal assures you that you are getting a solution that has never been used. This tamper evident seal also aids in the protection of the solution in the shipping process. Lot # control All solutions are made fresh to order and shipped directly to the end user, not to a distributor. This assures you the longest expiration date possible. All products have lot numbers that are computer generated, and go through extensive quality control measures to make sure the product works the way it should. A quality control sheet is generated with each lot. This lot number enables us to track the product so that we can assist our customers immediately with any technical help. The lot number is cross referenced with the customer's account number. Safety Safety is very important at Poly Scientific. We value our employees' safety as well as our customers' safety. That is why our Material Safety Data Sheets are computer generated with each initial order, and are routinely reviewed. All labels conform to OSHA rules and regulations. A hazardous communication program has been established and implemented. Prefilled Containers All prefilled containers are filled mechanically. This assures you each container has the exact measurement of solution in it. All prefilled containers are filled half way unless other wise specified.