An expiry date is a promise. When a label states that a product stays safe and good until a certain day, the manufacturer is making a claim that regulators, retailers and customers all rely on. If that claim rests on a guess, one spoiled batch can lead to recalls, rejected shipments and lasting damage to a brand. Shelf life testing replaces guesswork with evidence. This guide explains what a study involves, which storage conditions matter in a hot climate and how to build expiry claims you can defend.
What shelf life really means?
Shelf life is the period a product can be kept before it starts to deteriorate, provided the stated storage conditions are followed. The clock starts when the product is prepared or manufactured, so every day spent in a warehouse or on a truck counts. The length depends on the ingredients, the manufacturing process, the type of packaging and the way the product is stored. The result appears on the pack as a date mark, which is why that date needs data behind it.
What a study actually measures
A proper study looks at far more than whether a product still appears fine. The main checks include:
- Microbiological testing to confirm that bacteria, yeast and mould remain within safe limits over time.
- Rancidity tests, which matter for any product containing fats or oils.
- Texture, taste and colour monitoring to catch changes a customer would notice long before a safety concern appears.
- Ingredient activity testing to confirm that functional or active ingredients still perform as claimed.
Together, these results show when a product stops being safe and when it stops being good, and those two points are often different.
Choosing the right storage conditions
The conditions used in a study should reflect how your product really travels and sits. URS Labs offers six standard conditions:
- Frozen at -18°C
- Refrigerated at 4°C
- Ambient at 25°C and 60% relative humidity
- Intermediate at 30°C and 65% relative humidity
- Accelerated at 40°C and 75% relative humidity
- Tropical at 30°C and 75% relative humidity
The tropical option deserves special attention for products sold in this region. Summer heat and humidity can reach ports, warehouses and unrefrigerated retail spaces, and a product that performs well at 25°C may age much faster in those settings. Testing under conditions that match real distribution gives a far more honest expiry date.
Real-time and accelerated studies
Real-time studies store the product under its intended conditions and test it at planned intervals until quality begins to fall. They give the most reliable answer, although they take as long as the shelf life you hope to claim.
Accelerated shelf life testing uses higher temperature and humidity to speed up deterioration. It gives an early estimate, which is useful when a launch date is close. Most brands combine the two approaches: accelerated data supports an initial date, and real-time data confirms it over the following months.
Common mistakes that weaken expiry claims
Many expiry problems trace back to avoidable errors in how the study was planned:
- Testing a single condition while the product is stored and shipped under several.
- Ignoring packaging. The same food can age at very different speeds in a pouch, a tin or a glass jar.
- Ending the study too soon. A study should continue past the proposed date so the true limit is understood.
- Copying a competitor’s date. Two similar products can behave differently because of small changes in recipe or processing.
- Skipping retesting after a change. A new ingredient, supplier or pack size can alter shelf life.
Why laboratory credentials matter
Data is only as convincing as the laboratory behind it. URS Labs operates an ISO/IEC 17025 accredited testing laboratory with experienced analysts handling microbiological and sensory assessments. Accredited results carry weight with retailers, distributors and authorities, which makes approvals and listings smoother.
Every product deserves a date it can stand behind. To discuss a study for your range, get in touch with the team at URS Labs, email info@urslabs.com or call +971 4 883 71 15.