Materials for packaging

2. Functional property requirements of packaging materials

	Functional Property	Specific Factors
1	Gas permeability	O₂, CO₂, N₂, H₂O vapor
2	Protection against environmental factors	Light, odor, microorganisms, moisture
3	Mechanical properties	Weight, elasticity, heat-sealability, mechanical sealability, strength (tensile, tear, impact, bursting)
4	Reactivity with food	Grease, acid, water, color
5	Marketing-related properties	Attractiveness, printability, cost
6	Convenience	Disposability, repeated use, resealability, secondary use
7	Aroma	Aroma compound barrier property

Source: Jelen, P. 1985. Food packaging technology. In Introduction to Food Processing, Reston Publishing, Reston, VA, pp. 249–266.