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définition - Shelf_life

shelf life (n.)

1.the length of time a packaged food or drug will last without deteriorating

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définition (complément)

voir la définition de Wikipedia

synonymes - Shelf_life

shelf life (n.)

storage life

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dictionnaire analogique

Wikipedia - voir aussi


Shelf life

  This pack of diced pork says 'display until' 7 May and 'use by' 8 May
  Package testing: Heat sealing film for evaluation of shelf life of lettuce

Shelf life is the length of time that foods, beverages, pharmaceutical drugs, chemicals, and many other perishable items are given before they are considered unsuitable for sale, use, or consumption. In some regions, a best before, use by or freshness date is required on packaged perishable foods.

Shelf life is the recommendation of time that products can be stored, during which the defined quality of a specified proportion of the goods remains acceptable under expected (or specified) conditions of distribution, storage and display.[1]

Most shelf life dates are used as guidelines based on normal and expected handling and exposure to temperature. Use prior to the expiration date does not necessarily guarantee the safety of a food or drug, while a product is not always dangerous nor ineffective after the expiration date.[2]


  Shelf life

Shelf life is different from expiration date; the former relates to food quality, the latter to food safety.[3] A product that has passed its shelf life might still be safe, but quality is no longer guaranteed. In most food stores, shelf life is maximized by using stock rotation, which involves moving products with the earliest sell by date to the front of the shelf, meaning that most shoppers will pick them up first and so getting them out of the store. This is important, as some stores can be fined for selling out of date products, and most if not all will have to mark such products down as wasted, leading to a loss of profit.

Shelf life is most influenced by several factors: exposure to light and heat, transmission of gases (including humidity), mechanical stresses, and contamination by things such as micro-organisms. Product quality is often mathematically modelled around a parameter (concentration of a chemical compound, a microbiological index, or moisture content).[4]

For some foods, the shelf life is an important factor to health. Bacterial contaminants are ubiquitous, and foods left unused too long will often acquire substantial amounts of bacterial colonies and become dangerous to eat, leading to food poisoning. However, the shelf life itself is not an accurate indicator to the food safety. For example, pasteurized milk can remain fresh for five days after its sell-by date if it is refrigerated properly. In contrast, if milk already has harmful bacteria, the use-by dates become irrelevant.[2]

The expiration date of pharmaceuticals specifies the date the manufacturer guarantees the full potency and safety of a drug. Most medications are potent and safe after the expiration date. A rare exception is a case of renal tubular acidosis purportedly caused by expired tetracycline. A study conducted by the U.S. Food and Drug Administration covered over 100 drugs, prescription and over-the-counter. The results showed about 90% of them were safe and effective as far as 15 years past their expiration dates. Joel Davis, a former FDA expiration-date compliance chief, said that with a handful of exceptions - notably nitroglycerin, insulin and some liquid antibiotics - most expired drugs are probably effective.[5]

Shelf life is not significantly studied during drug development[dubious ], and drug manufacturers have economic and liability incentives to specify shorter shelf lives so consumers discard and repurchase products[opinion]. One major exception is the Shelf Life Extension Program of the US Department of Defense, which commissioned a major study of drug efficacy from the FDA starting in the mid 1980's. One criticism is the FDA refused to issue guidelines based on SLEP research for normal marketing of pharmaceuticals even though the FDA performed the study. The SLEP and FDA signed a memorandum that scientific data could not be shared with the public, public health departments, other government agencies, and drug manufacturers[6]. State and local programs are not permitted to participate[7]. The failure to share data has caused foreign governments to refuse donations of expired medications.[8] One exception occurred during the 2010 Swine Flu Epidemic when the FDA authorized expired Tamiflu based on SLEP Data[9]. The SLEP discovered drugs such as cipro remained effective nine years after their shelf life, and, as a cost-saving measure, the US military regularly uses a wide range of SLEP tested products past their official shelf life if drugs have been stored properly[10].

Preservatives and antioxidants may be incorporated into some food and drug products to extend their shelf life. Some companies use induction sealing and vacuum/oxygen-barrier pouches to assist in the extension of the shelf life of their products where oxygen causes the loss.

Some degradation factors can be controlled by use of appropriate packaging. For example, the amber bottle used for many beers blocks damaging wavelengths of light. Transparent beer bottles do not. Packaging with barrier materials (e.g. low moisture vapor transmission rate, etc.) extends the shelf life of some foods and pharmaceuticals.

The United States Department of Defense (DoD) Shelf-Life Program defines shelf-life as,

The total period of time beginning with the date of manufacture, date of cure (for elastomeric and rubber products only), date of assembly, or date of pack (subsistence only), and terminated by the date by which an item must be used (expiration date) or subjected to inspection, test, restoration, or disposal action; or after inspection/laboratory test/restorative action that an item may remain in the combined wholesale (including manufacture's) and retail storage systems and still be suitable for issue or use by the end user. Shelf-life is not to be confused with service-life (defined as, A general term used to quantify the average or standard life expectancy of an item or equipment while in use. When a shelf-life item is unpacked and introduced to mission requirements, installed into intended application, or merely left in storage, placed in pre-expended bins, or held as bench stock, shelf-life management stops and service life begins.)[11]

Shelf life is often described in conjunction with a specific product, package, and distribution system. For example, An MRE field ration is designed to have a shelf life of three years at 80°F and six months at 100°F.[12]

  Temperature control

Nearly all chemical reactions will occur (at various rates depending on the individual nature of the reaction) at common temperatures. The degradation of foods and pharmaceuticals is usually accelerated by exposure to high temperatures. Another example is the breakdown of many chemical explosives into more unstable compounds. Nitroglycerine is notorious. Old explosives are thus more dangerous (i.e., liable to be triggered to explode by very small disturbances, even trivial jiggling) than more recently manufactured explosives. Rubber products also degrade as sulphur bonds induced during vulcanization revert; this is why old rubber bands and other rubber products soften and get crispy, and lose their elasticity as they age.

These breakdown processes characteristically happen more quickly at higher temperatures. The usually quoted rule of thumb is that chemical reactions double their rate for each temperature increase of 10 degrees Celsius (°C) because of activation energy barriers become more easily surmounted at higher temperatures. However, as with all rules of thumb, there are many caveats and assumptions. This particular one is most applicable to reactions with activation energy values around 50 kJ/mole; many of these are important at the usual temperatures we encounter. It is often applied in shelf life estimation, sometimes wrongly. There is a widespread impression, for instance in industry, that "triple time" can be simulated in practice by increasing the temperature by 15 °C, e.g., storing a product for one month at 35 °C simulates three months at 20 °C. There is enough variation that this practical rule cannot be routinely relied upon.

The same is true, to a point, of the chemical reactions of life. They are usually enzymatically catalyzed which changes reaction rates, but with constant catalytic action, the rule of thumb is still mostly applicable. In the particular case of bacteria and fungi, the reactions needed to feed and reproduce increase at higher temperatures, up to the point that the proteins and other compounds in their cells themselves begin to break down, or denature, so quickly that they cannot be replaced. This is the reason high temperatures kill bacteria and other micro organisms; 'tissue' breakdown reactions reach such rates that they cannot be compensated for and the cell dies. On the other hand, 'elevated' temperatures short of these result in increased growth and reproduction; if the organism is harmful, perhaps to dangerous levels.

Just as temperature increases speed up reactions, temperature decreases reduce them. Therefore, to make explosives stable for longer periods, or to keep rubber bands springy, or to force bacteria to slow down their growth, they can be cooled. This is the reason shelf life is generally extended by temperature control: (refrigeration, insulated shipping containers, controlled cold chain, etc.) and the reason some medicines and foods must be refrigerated.

Temperature data loggers, RFID tags and Time Temperature Indicators can record the temperature history of a shipment to help determine the remaining shelf life.[13]

  Parallel names

  Best before

  A tag sealing a bag of hot dog buns displays a best before date of February 29.

Best before or best by dates appear on a wide range of frozen, dried, tinned and other foods. These dates are only advisory and refer to the quality of the product, in contrast with use by dates, which indicate that the product is no longer safe to consume after the specified date.[14] In spite of this, about a third of food bought is thrown away while still edible.[citation needed] In fact, food kept past the best before date will not necessarily be harmful, but may begin to lose its optimum flavour and texture. Eggs are a special case, since they may contain salmonella, which multiplies over time; they should therefore not be eaten after the best before date, which is a maximum of 28 days after the eggs are laid. Eggs must be sold to the consumer within 21 days of laying;[citation needed] this means that they must be sold 7 days before the 'best before' date expires.

Sometimes the packaging process involves using pre-printed labels, making it impractical to write the best before date in a clearly visible location. In this case, a term like best before see bottom or best before see lid might be printed on the label and the date marked in a different location as indicated.

  Use by

  A foil milk bottle top from the UK displays a use by date of December 26 pressed into the foil.

Generally, foods that have a use by date written on the packaging must not be eaten after the specified date. This is because such foods usually go bad quickly and may be injurious to health if spoiled. It is also important to follow storage instructions carefully for these foods (for example, product must be refrigerated).

Foods that have a best before date are usually safe to eat after the date has passed, although they are likely to have deteriorated either in flavour, texture, appearance or nutrition.

Bathroom products/toiletries usually state a time in months by which, once the product is opened, they should be used. This is often indicated by a graphic of an open tub, with the number of months written inside (e.g., "12M" means use the product within 12 months of opening).[15]

  Open dating

Open Dating is the use of a date or code stamped on the package of a food product to help determine how long to display the product for sale. It is also beneficial to the customer and ensures that the product is at its best quality when bought. An Open Date does not supersede a Use by date, which should still be followed.[16]

  Sell by / Display until

These dates are intended to help keep track of the stock in stores. Food that has passed its sell by or display until date, but is still within its use by / best before will still be edible, assuming it has been stored correctly. It is common practice in large stores to throw away such food, as it makes the stock control process easier. It also reduces the risk of customers buying food without looking at the date, only to find out the next day that they cannot use it. Tampering with the posted date is illegal in many countries.

Most stores will rotate stock by moving the products with the earliest dates to the front of shelving units, which allows them to be sold first and saving them from having to be either marked down or thrown away, both of which contribute to a loss of profit.

  Issues associated with sell by / use by dates

According to the UK Waste & Resources Action Programme (WRAP), 33% percent of all food produced is wasted along the chill chain or by the consumer.[17][citation needed] At the same time, a large number of people get sick every year due to spoiled food. According to the WHO and CDC, every year in the USA there are 76 million foodborne illnesses, leading to 325,000 hospitalizations and 5,000 deaths.[18]

According to former UK minister Hilary Benn, the use by date and sell by dates are old technologies that are outdated and should be replaced by other solutions or disposed of altogether.[19] The UK government's Department for Environment, Food and Rural Affairs revised guidance in 2011 to exclude the use of sell by dates. The guidance was prepared in consultation with the food industry, consumer groups, regulators, and Waste & Resources Action Programme (WRAP). It aims to reduce the annual £12bn of wasted supermarket food.[20]


After losing an expensive lawsuit, one pharmacy chain - CVS - implemented a system that causes its registers to recognize expired products and avert their sale.[21]

  Regulation in the US

Sale of expired food products, per se, is lightly regulated in the US. Some states (like New York) bar such sale, and/or require expiration dates on all foods, but many (like California) do not. However, sale of contaminated food is generally illegal, resulting in product liability.[22]

  US Government guidelines

The Food and Drug Administration, which regulates packaged foods and drugs, only requires a use-by, or expiration, date on infant formula and some baby foods, because formula must contain a certain quantity of each nutrient as described on the label. If formula is stored too long, it loses its nutritional quality, and also separates or form lumps that will clog the bottle nipple. Except for infant formula and some baby foods, product dating is not required by FDA regulations.[23]

The Agriculture Department (USDA), which regulates fresh poultry and meats, only requires labeling of the date when poultry is packed. However, many manufacturers also add sell-by or use-by dates.[2]

The DoD Shelf-Life Program operates under the DoD Regulation 4140.1-R, DoD Materiel Management Regulation, ([24])

A. There are items in the Department of Defense (DoD) and the Federal Supply System that require special handling due to certain deteriorative characteristics. These items are to be properly maintained to ensure that the customer is provided fresh, useable materiel. The purpose of this Manual is to establish a shelf-life program and process, with special emphasis on those items having these known deterioration characteristics, to mitigate the risk of shelf-life expiration and lapses of shelf-life items/materiel beyond their inspect/test dates.
B. Provide policy and basic procedures for the management of both non-consumable and consumable shelf‑life items that may be hazardous material (HAZMAT) or non-hazardous material, spanning all classes of supply and stored at all levels of the Federal Supply System. Shelf-life management for hazardous materiel follows the same procedures as those for any shelf-life items, except that hazardous materiel should receive priority processing over non-hazardous materiel. Issues and guidelines concerning the acquisition, storage, handling, transportation, and disposal of hazardous materiel are addressed in Chapters 3 and 5 of this Manual. Class I perishable subsistence, Class III bulk petroleum, Class V ammunition, and Class VIII-B blood, are excluded from this Manual and shall continue to be managed in accordance with existing regulations. Commodities excluded from this Manual may be represented by their respective DoD Component to the DoD Shelf-Life Board. The definitions for “classes of supply” may be found in Appendix 16 of DoD 4140.1-R.
C. This Manual endorses the pollution prevention measures in DoD Instruction 4715.4 for hazardous materiel (HAZMAT) minimization (HAZMIN), as well as, the establishment of hazardous materiel control and management (HMC&M) philosophies which include consolidation and reutilization practices that embrace HAZMIN and HAZMAT elimination to reduce the hazardous waste (HW) stream.
D. Appendices A through K augment this Manual and furnish additional information germane to the DoD Shelf-Life Management Program. Appendix L serves as a quick reference index to this Manual.


  Freshness date

A freshness date is the date used in the American brewing industry to indicate either the date the beer was bottled or the date before which the beer should be consumed.

Beer is perishable. It can be affected by light, air, or the action of bacteria. Although beer is not legally mandated in the USA to have a shelf life, freshness dates serve much the same purpose and are used as a marketing tool.

  Beginnings of freshness dating

General Brewing Company of San Francisco marketed their Lucky Lager Beer as "Age Dated" as early as late 1935.[25] They stamped a date on each can lid to indicate that the beer was brewed before that date. This was not to ensure that the beer was "fresh" but to ensure that it had been aged properly. So many breweries had rushed beer to market before it was ready when Prohibition ended, that customers were wary of getting "green" beer. The Boston Beer Company, maker of Samuel Adams, was among the first contemporary brewers to start adding freshness dates to their product line in 1985. For ten years there was a slow growth in brewers adding freshness dates to their beer. The practice rapidly grew in popularity after the Anheuser-Busch company's heavily marketed "Born-On dates" starting in 1996. Many other brewers have started adding freshness dates to their products, but there is no standard for what the date means. For some companies, the date on the bottle or can will be the date that the beer was bottled; others have the date by which the beer should be consumed.

  Parallel Concepts

Industry, in general, does not see the use of these terms applied simply to foods, particularly perishables. Gasoline, although not normally stated at point-of-sale, definitely is a consumable, and is subject to a shelf life. Exceeding this time-frame will introduce harmful varnishes, etc. into equipment designed to operate with these products, i.e. a gasoline lawn mower that has not been properly winterized could incur damage that will prevent use in the spring, and require expensive servicing to the carburetor.

Also, an issue of ongoing contention, is the implementation of a 'must be used by ...', or 'valid until...' statement on service products, or value-exchange instruments, purchasable as items like gift certificates, or pre-paid phone cards, where, after the displayed date the product will either no longer function (electronically, like a gift card), or the merchant may simply refuse to honor the value presented, simply because of the contract terms displayed on the document. Bell Mobility and its parent company, BCE Inc. have been served with notice of a $100-million class-action lawsuit alleging that expiry dates on its pre-paid wireless services are illegal.[26]

This behavior normally does not see the merchant offering to reimburse the consumer, in whole or in part, for any money exchanged in a purchase agreement.

An example of an exception to this practice may look like a restaurant issuing a gift certificate as a prize donation, or as amends for a customers dissatisfaction in the past.

  See also


  1. ^ Gyesley, S. W. (1991). Total Sysstems Approach to Predict Shelf Life of Packaged Foods. ASTM STP 1113-EB. 
  2. ^ a b c "The_Truth_About_Food_Expiration_Dates". http://www.businessweek.com/bwdaily/dnflash/content/oct2006/db20061002_959305.htm?campaign_id=rss_topStories. Retrieved 2008-09-01. 
  3. ^ See "Expiration dates". Consumer Affairs. http://www.consumeraffairs.com/nutrition/expiration_dates.htm. Retrieved 11 November 2011. 
  4. ^ Azanha, A.B.; Faria (July 2005). "Use of mathematical models for estimating the shelf-life of cornflakes in flexible packaging". Packaging Technology and Science 18 (4): 161–222. DOI:10.1002/pts.686. 
  5. ^ Cohen, Laurie P. (2000-03-28). "Many Medicines Prove Potent for Years Past Their Expiration Dates.". Wall Street Journal 235 (62): pp. A1 (cover story). 
  6. ^ http://www.usamma.army.mil/dod_slep.cfm
  7. ^ http://www.upmc-biosecurity.org/website/resources/publications/2009/2009-03-27-max_st_local_med_cntr.html
  8. ^ http://www.essentialdrugs.org/edrug/archive/200003/msg00076.php
  9. ^ http://www.fda.gov/newsevents/publichealthfocus/ucm154962.htm
  10. ^ http://www.usamma.army.mil/assets/docs/dlar.pdf
  11. ^ "The DoD Shelf-Life Program - Shelf-Life Management Manual - Definitions". Archived from the original on 2011-07-22. http://web.archive.org/web/20110722194243/https://www.shelflife.hq.dla.mil/Policy_4140_27/06Definitions.htm. 
  12. ^ "Nanotechnology applied to raton packaging". SSC National Press Release. June 2004. http://www.natick.army.mil/about/pao/2004/04-21.htm. 
  13. ^ Meyers, T (June 2007). "RFID Shelf-life Monitoring Helps Resolve Disputes". RFID Journal. http://www.rfidjournal.com/article/articleview/3357/1/128/. 
  14. ^ Food Standards Agency - Eat well, be well - Best before
  15. ^ Orus, Pilar; Sonia Leranoz (June 2005). "Current trends in cosmetic microbiology". International Microbiology 8 (2). http://scielo.isciii.es/scielo.php?pid=S1139-67092005000200001&script=sci_arttext&tlng=en. Retrieved 6 April 2011. 
  16. ^ "Food_Product_Dating". http://www.fsis.usda.gov/Fact_Sheets/Food_Product_Dating/index.asp. Retrieved 2007-08-15. 
  17. ^ Household Food and Drink Waste in the UK, WRAP 2009
  18. ^ WHO | Food safety and foodborne illness
  19. ^ Shields, Rachel (2009-06-07). "Kitchen bin war: tackling the food waste mountain". The Independent (London). http://www.independent.co.uk/environment/green-living/kitchen-bin-war-tackling-the-food-waste-mountain-1698753.html. Retrieved 2010-05-23. 
  20. ^ Batty, David (2011-09-15). "Government bins 'sell-by' dates to reduce food waste". The Guardian (London). http://www.guardian.co.uk/environment/2011/sep/15/food-waste-sellby-dates. Retrieved September 15, 2011. "The "sell-by" date on food packaging is to be removed in a bid to cut the £12bn worth of food needlessly binned every year. [...] The Department for Environment, Food and Rural Affairs produced the guidance in consultation with the food industry, consumer groups, regulators, and the Waste and Resources Action Programme (Wrap)." 
  21. ^ http://www.consumercal.org/article.php?id=1779 @ 1:40
  22. ^ http://www.nolo.com/legal-encyclopedia/lawsuits-involving-food-poisoning-29673.html
  23. ^ "Eat By Date - Shelf Life & Food Storage Information". http://www.eatbydate.com/best-before-date-definition/. 
  24. ^ "The DoD Shelf-Life Program - Shelf-Life Management Manual - DoD 4140.27-M - Chapter 1, General". https://www.shelflife.hq.dla.mil/policy_DoD4140_27.aspx. 
  25. ^ Bill Yenne. 2004. Great American Beers: Twelve Brands That Became Icons.
  26. ^ [1]

  Further reading

  • Anonymous, "Cold Chain Management", 2003, 2006, [2]
  • Anon, Protecting Perishable Foods During Transport by Truck, USDA Handbook 669, 1995, [3]
  • Kilcast, D., Subramamiam, P., "The Stability and Shelf-life of Food, Woodhead Publishing, 2000, ISBN 1-85573-500-8
  • Labuza, T. P., Szybist, L., "Open dating of Foods". 2001, Food and Nutrition Press, Trumbul CN; other edition: Wiley-Blackwell, 2004, ISBN 0-917678-53-2
  • Man, C. M., Jones. A. A., "Shelf-Life Evaluation of Foods", ISBN 0-8342-1782-1
  • Steele, R., "Understanding and measuring the shelf-life of food", Woodhead Publishing, 2004, ISBN 1-85573-732-9
  • Weenen, H., Cadwallader, K., "Freshness and Shelf Life of Foods", ISBN 0-8412-3801-4

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