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.
9. If you tend to sweat off your sunscreen, look for products with a water/sweat-resistance formula and a touch of menthol. It will keep you cool, dry and safe.OUR PICK Ocean Potion Cool Dry Touch Sport SPF 50 sunscreen, $8; at amazon.com.. Best for Sensitive Skin. Many women skip sunscreen because it inflames their skin-which isn't worth the hassle if they're just sitting in an office all day anyway. Not so: According to Santa Monica dermatologist Ava Shamban, that's all the more reason to stay protected. UVA rays penetrate glass, she says.