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.
Yes, but if your bottle is within the expiration date, youâre good to go. Published: May 24, 2014 06:00 AM. Sunscreens. Sunscreens are designed to stay âfreshâ for three years, and the expiration date on the bottle is reliable. As part of our most recent tests of sunscreens, we retested samples we had stored from the previous yearâs testing and found that their performance did not suffer. It does depend on where the sunscreen has been sitting since last summer, though. If you find a bottle in your trunk or glove compartment, toss it.