Developed almost 40 years ago, American-made Whirl-Pak® bags were the first sterile sample bags on the market. They were designed to provide milk haulers with a container for collecting samples of bulk produced milk. Whirl-Pak® bags made possible the “universal sample system”, which means that a single sample can be used for all tests required for quality control, product content, and legal compliance. Whirl-Pak® sample bags are made from blended virgin, low-density polyethylene, giving the bags two important characteristics:
• Exceptionally clear film – easy to see through
• Superior strength – unbreakable sample container
They may be used for taking samples of liquids, semi-solids, or solids. Whirl-Pak® bags are patented under Patent No. 2,973,131 and other patents pending. The film thickness varies from 2.25 mil (.057 mm) to 4 mil (.102 mm) depending on the size and style. Because of the high quality blended polyethylene, a high mil thickness is not required to achieve optimum strength.

Whirl-Pak® bags are not autoclavable

• Ethylene Oxide Gas. Whirl-Pak® bags are sterilized with ethylene oxide gas by an independent, ISO certified sterilization company. This saves valuable preparation time and eliminates concern about sample integrity. Only Whirl-Pak® bags go through this separate sterilization process after manufacturing; if you are not using a Whirl-Pak® bag, you are probably using a bag that has not gone through this important sterilization procedure.

• Sterility Documentation. Documentation of sterility is available upon request from Nasco for each box by individual lot number. This documentation, provided by an independent ISO certified testing laboratory, verifies sterility for the entire load.

• Look for the Whirl-Pak® Name. Each and every bag is clearly marked with “Whirl-Pak®” on the bag. If it doesn’t say Whirl-Pak® …it’s not our patented sterilized bag.

• If You Have to Go to Court — For your peace of mind, (as well as following good laboratory practices), should you be challenged in court, always use Whirl-Pak® bags.

• Whirl-Pak® bags use only 10% or less space than other containers
• Valuable space savings in the lab, vehicle, warehouse, etc.
• Significant savings on shipping costs
• Easy disposal after use

• A felt-tip marker can be used to write on the plain bags
• Regular pen, pencil, or marker can be used on the special write-on surface (see catalog page 5)
• Positive ID eliminates confusion and mistakes during testing and analysis procedures

By whirling or tightly folding the tab over three times, the Whirl-Pak® bag becomes a leakproof container, which:
• Eliminates the loss of a valuable sample
• Prevents impurities from entering the bag and contaminating the sample

Proper sampling procedures are of vital importance. Laboratory findings are completely dependent on the quality of the sample collected. It is imperative that each sample be representative of the lot from which it came, and that it arrives at the laboratory in the same condition it was in at the collection point. There should be no change in chemical, physical, or biological character. All Whirl-Pak® bags are made in the U.S.A., and to show the excellent qualities of these bags, a free trial pack is included inside the back cover of this catalog. Use the samples for your own trial. You will enjoy the ease with which you can use the bag, and be amazed by the strength of it as well. Most important, see for yourself the money-saving advantages of Nasco’s Whirl-Pak® sample bags.