It is sometimes convenient to categorize packages by layer or function: primary, secondary, etc. 1  Primary packaging is the material that first envelops the product and holds it. This usually is the smallest unit of distribution or use and is the package which is in direct contact with the contents.
Sunscreen does not stop working the day after the expiration date. Sunscreen is usually effective for at least three years, which is usually longer than the expiration date marked. What to Look for When You have Allergies or Sensitive Skin. Skin allergies can be a common problem. For individuals with sensitive skin, try physical sunscreens. Physical sunscreen protects your skin by deflecting or blocking the sun's rays, while chemical sunscreens absorb the sun's rays.
If sunscreens have expired there is a good chance they are still good for a few months; however once you reach the expiration date there is no guarantee that the level of activity is still present. â¢ The best place to store your SPF product is in a cool place out of direct sunlight and heat. â¢ Buy smaller sizes of your SPF product vs. larger â30% extra for freeâ products, which will inevitably expire before you get a chance to use them all and youâll end up having to throw them out.