CPT Shelf Life & Product Protection

Question 1

Which unit is most commonly used to express Moisture Vapor Transmission Rate (MVTR) in packaging films?

Accepted Answer

g/m²/day

Answer

mL/m²/day·atm

Answer

cc/100in²/24hr at STP

Answer

mg/L/hr

Question 2

The Oxygen Transmission Rate (OTR) of a packaging material is critical for products that are susceptible to oxidative rancidity. Which of the following materials has the LOWEST OTR?

Accepted Answer

Ethylene vinyl alcohol (EVOH)

Answer

Low-density polyethylene (LDPE)

Answer

Polypropylene (PP)

Answer

Polyethylene terephthalate (PET)

Question 3

In accelerated shelf life testing (ASLT), the Arrhenius equation is used to predict product shelf life at ambient temperature. What does the Q10 factor represent?

Accepted Answer

The increase in reaction rate for a 10°C rise in temperature

Answer

The ratio of shelf life at 10°C to shelf life at 20°C

Answer

The amount of oxygen absorbed per 10 days

Answer

The moisture gain per 10°C change

Question 4

Water activity (aw) is a critical parameter for predicting microbial shelf life. Which aw level represents the threshold below which most bacteria cannot grow?

Accepted Answer

0.91

Answer

0.85

Answer

0.70

Answer

0.60

Question 5

Which type of packaging test measures the rate at which gases permeate through a film under a partial pressure differential?

Accepted Answer

Gas permeation test

Answer

Seal strength test

Answer

Drop impact test

Answer

Creep test

Question 6

Headspace gas analysis is performed on sealed packages to verify the atmosphere inside. Which instrument is most commonly used for this purpose?

Accepted Answer

Gas chromatograph or O₂/CO₂ analyzer

Answer

Texture analyzer

Answer

Spectrophotometer

Answer

Tensile tester

Question 7

A food manufacturer wants to calculate the shelf life of a product stored at 25°C using data obtained from testing at 35°C and 45°C. This approach is known as:

Accepted Answer

Accelerated shelf life testing (ASLT)

Answer

Intrinsic factor analysis

Answer

Real-time stability study

Answer

Proximate analysis