Replacement of positive and negative chromatographic system in liquid chromatograph

In liquid chromatography analysis, we make the following summary about the replacement content of positive and reversed phase chromatography

1. First, use n-hexane (silica gel column) to equilibrate the chromatography system including the normal phase column (guarantee that the baseline is straight and no peak appears within 20 minutes);

2. Remove the silica gel column, seal it and save;

3. Short-circuit the sampling valve and the detector, flush the chromatography system with isopropyl alcohol for 10 minutes (flow rate 1ml / min). During this period, empty the sampling valve three times;

4. Change the methanol (or eye) to flush the system for 20 minutes (flow rate 2ml / min), during this period empty the sampling valve three times;

5. Install the reversed-phase chromatography column, adjust the flow rate to 1ml / min, rinse the system with methanol (or eye) until the system is balanced;

6. Into the three-pin standard product, check whether the area and retention time are repeated, if not, continue to rinse until repeated.

Keep invoices, packing lists and shipping orders protected and securely attached to boxes and other containers throughout the shipping process

Crafted from oil- and water-resistant polyethylene with a high-tack rubber resin adhesive, our packing list envelopes are built to withstand some of the toughest handling conditions.

Available with or without printing in a variety of sizes to match your individual shipping needs. To keep shipping labels safe and secure, we also offer both clear and high visibility label protection tapes.

printed/unprinted, clear/white, side-loaded /top loading polyethylene envelope with easy and secure open and close. We designed this envelope with a high-tack rubber resin adhesive that sticks on contact to packages. Oil- and water-resistant, this Packing List Envelope securely protects documents from damage throughout delivery.
  • side-loaded/ top-loaded envelope opens easily and closes securely
  • Provides control and protection of on-package packing list and invoice documents
  • Non-printed/printed  design provides a clear window for logos, instructions or other information and is barcode readable
  • Offers convenient peel-and-stick document attachment
  • Features a polyethylene backing, synthetic rubber adhesive and paper liner
  • Tough film helps reduce puncturing and tearing

Customized Products

Logistics Packaging,Packing List Envelope,Express Packaging, Courrier Packaging, Packing List Pouch, Packing list enclosed

AM-Besten Technology Ltd. ,

Posted on