Types of Poly Materials

Standard Low Density

Low density polyethylene (LDPE) is the most versatile choice for a wide range of packaging needs, and for that reason, it is the material from which most of our stock poly bags and poly film are made. Low density is has excellent clarity and strength, and has adequate substance to protect most items it covers. Most low mil bags such as gusseted bags, flat poly bags, poly tubing and pallet covers are made from low density polyethylene.

Clarity Resin

Clarity is the degree to which a film is transparent and clear of clouding. Resins are manufactured to match a profile, and that profile predicts its extrusion performance across a range of behaviors. One of the elements in a profile is haze, and when high clarity is critical to the display of a product, we can manufacturer your film from resin with a low haze.

Linear Low Density

Linear low density polyethylene (LLDPE) film has a molecular configuration that lends it to applications where strength, and puncture strength in particular, is more important than clarity. LLDPE films tend to stretch more than low density films before breaking, though they are typically lighter and provide less barrier protection. This linear low density resin material permits bags to be of a thinner gauge, their bottom sealed design also provides the bags with added strength. Our linear low density bags are ideal for almost any type of food application because they meet the FDA requirements for use in food applications. Also, our poly bags offer an economical cost efficient alternative to other more costly standard low density bags.


When EVA, or ethyl-vinyl acetate, is present as 2-3% additive to a polyethylene resin, it can make a bag considerably stronger. EVA is often used in applications where a bag or film will be frozen, and helps the film resist cracking.


Anti-block is an additive that may reside in polyethylene resin or be mixed with a resin to alter its performance. When polyethylene resin is extruded, anti-block bleeds to the inside of the bags and increases the ease with which bags open.


Non-scratch bags and film contain little or no anti-block additive. This additive, when it bleeds to the inside of a bag, may appear as a fine powder capable of scratching very delicate products. Because anti-block also makes the inside of bags slippery, however, non-scratch bags and tubing will be very difficult to open.


Slip is an additive that may reside in polyethylene resin or be mixed with a resin to alter its performance. When polyethylene resin is extruded, slip bleeds to the outside of the bags and increases the degree to which they slip, or glide. Slip makes bags easy to handle and prevents them from sticking to one another. High slip bags call for extra slip additive which increases the degree to which bags glide in any given process or handling, whereas low slip bags inhibit movement and promote grip.


Transparent bags are see-through, regardless of their color.  Light can pass through the film. Transparent poly bags are ideal when you want the customer to see your product through the bag.  This is important for the food industry as well as small parts manufacturing where the customer might not buy the item if they can not see it first.


Opaque bags cannot be seen through, light can pass through the film. Opaque poly bags are ideal when the customer does not have to see the product in order to buy.  Many opaque bags add extra protection, such as the black conductive bag that is used mainly for small electronics to ensure the item is protected from any electric shock.


IPS Packaging is a leading provider of packaging supplies, packaging equipment and packaging solutions. If you would like to know more about IPS Packaging, call 800.277.7007 or contact our Sales team.

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Posted in Bags, Poly & Plastic, Packaging Supplies