Low Price Guarantee.  Find a Lower Price?  We'll Match or Beat It.


Your Cart is Empty

What is the Difference between Blown & Cast Stretch Film?

by Jim Stalker March 09, 2020

blown or cast stretch film

There are two types of stretch film -  blown and cast.  Both types have specific characteristics that create unique benefits depending on the application.

Blown Stretch Wrap is made from beads of resin that are fed through a heated machine that has a circular die.  The heated resin is forced through the die and then “blown out” vertically into a bubble.  As the formed bubble finishes the process of being made into rolls of stretch film it is cooled by air.  This type of film usually will cost more because it is more labor intensive.

Cast Stretch Wrap is made from beads of resin being fed into a heated barrel and being forced through a narrow slotted die.  This “sheet” of film the die produced is the fed along a rolling path that has been cooled which makes the film solid.  The film is then brought through its final stages of production and made into rolls.  This method is much quicker and less labor intensive making is less expensive to the customer. 


Blown Stretch Film

Cast Stretch Film

1). Load Retention:

More holding power, won't re-stretch once applied

Stretches easily, even after applied to pallet which can cause shifting

2). Film Memory:

Higher ability to shrink back to original size after stretch

Minimal ability to go back to original state after stretching

3). Film Yield:

Stretches much farther to cover more pallets with less film

Additional stretching can be obtained easier through lower micron blown films

4). Puncture Resistance:

Manufacturing process allows greater resistance to breaking

Standard tearing can occur when stressed too much

5). Cling of the Film:

1 sided cling, great for higher load retention

Naturally clingy on both sides, can make pallets stick together

6). Visual Clarity:

Not crystal clear, can make reading and scanning harder, but has a lower gloss reducing reflections

Perfectly clear, makes reading and scanning in warehouse light easy, but a higher gloss makes reflections annoying.

7). Noise on unwind:

Loud when releasing from the roll

Very quiet when unwound from the stretch roll


Jim Stalker
Jim Stalker

Leave a comment

Comments will be approved before showing up.

Also in Packaging & Shipping Supplies Blogs

What Can Newsprint Sheets Do For You?
What Can Newsprint Sheets Do For You?

by Jim Stalker September 09, 2021

Newsprint Sheets are not a secret but often an answer to many problems.  Many products simply need to be wrapped in order to be protected.  They’re flexible and can be used in a variety of ways...
Read More
Wood Shipping Crates- When Corrugated Boxes Aren’t Strong Enough
Wood Shipping Crates- When Corrugated Boxes Aren’t Strong Enough

by Jim Stalker August 11, 2021

Sometimes even the heaviest of corrugated boxes, Triple Wall, just aren’t strong enough.  That’s when it’s time to call in the big guns- Wood Shipping Crates...

Read More
Cut Down On Your Box Inventory With Our Multi-Depth Boxes
Cut Down On Your Box Inventory With Our Multi-Depth Boxes

by Jim Stalker July 26, 2021 1 Comment

"If I did not have the multi-depth boxes available I would have to keep 20+ different size shipping boxes on hand in order to be able to pack and ship my orders. Not only would that be cost prohibitive for me but they would also take up much more space here in our facility."
Read More