HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Engineering Materials
Cars Could Lose Weight With Green Cavity Foam
7/30/2012

A renewable version of Dow Automotive Systems' polyurethane cavity sealing BETAFOAM system can help cars lose weight and cut noise.   (Source: Dow Automotive Systems)
A renewable version of Dow Automotive Systems' polyurethane cavity sealing BETAFOAM system can help cars lose weight and cut noise.
(Source: Dow Automotive Systems)

Return to Article

View Comments: Newest First|Oldest First|Threaded View
<<  <  Page 2/2
greg
User Rank
Iron
Re: Removing the burdens around sustainable design
greg   7/30/2012 10:46:13 PM
NO RATINGS
at that density, and considering that as a foam it consists of mainly air, the material of the foam itself would have to be denser than lead!
must be a typo.


edit- from the dow chemicals betafoam brochure (not the new one):

BETAFOAM classic and low-MDI acoustic
foam products range in density from 2 pcf to
5 pcf.

Ann R. Thryft
User Rank
Blogger
Re: Removing the burdens around sustainable design
Ann R. Thryft   7/30/2012 1:50:04 PM
NO RATINGS
Dave, at least one of the specs were on their presentations and they were also given in the interview. I find it tough to believe that anyone at Dow would mistake units of measurement. I've sent an email asking them to verify the spec.

Dave Palmer
User Rank
Platinum
Re: Removing the burdens around sustainable design
Dave Palmer   7/30/2012 1:36:41 PM
NO RATINGS
@Ann: I wonder if your contact at Dow misspoke.  According to the datasheet for the previous product, its density is 2 pcf, not 2 g/cm³.

If so, it wouldn't be the first time somebody mixed up metric and U.S. customary units.

Ann R. Thryft
User Rank
Blogger
Re: Removing the burdens around sustainable design
Ann R. Thryft   7/30/2012 1:08:22 PM
NO RATINGS
Dave, the spec Dow provided was 1.45 gm/cc. Note that that's 25 percent less dense than the previous product at 2.0 gm/cc. James did not provide price details, or mention sheet forms of this product or any other future plans regarding it.

Dave Palmer
User Rank
Platinum
Re: Removing the burdens around sustainable design
Dave Palmer   7/30/2012 1:06:37 PM
NO RATINGS
@Ann: Calling soybean oil a "byproduct of food production" rather than a food product is a little disingenuous.  Soybean oil is one of the most widely-consumed cooking oils.

It's true that the soy flakes, which remain after the oil is extracted, are used as animal feed (and for soy protein for human consumption).  Using the oil as an industrial feedstock wouldn't affect this use.

Of course, soybean oil is already widely used in industry -- for instance, it's used to make ink -- and it seems unlikely that the (relatively) small amount of additional soybean oil which would be used to make these foams would have any impact on the price or supply of cooking oil.

But, yes, soybean oil is a food product.

Ann R. Thryft
User Rank
Blogger
Re: Removing the burdens around sustainable design
Ann R. Thryft   7/30/2012 12:35:51 PM
NO RATINGS
I also think it's cool that this cavity foam using a non-food renewable material that's a byproduct of food production. Many materials companies are getting on the bandwagon to ensure that their feedstocks are really green: both renewable and non-competitive with the human food supply.

Dave Palmer
User Rank
Platinum
Soy-based polyurethanes
Dave Palmer   7/30/2012 12:15:31 PM
NO RATINGS
@Ann: Are you sure that the density is 1.45 g/cm³? This is equivalent to 90 pounds per cubic foot.  At this density, the  foam would sink in water.  The density of a typical polyurethane sound-absorbing foam is around 2 pounds per cubic foot (about 0.03 g/cm³).  Are you sure the density wasn't given in U.S. units, rather than metric units?

Generally, the sound absorption of foams depends on the frequency of the sound.  Any indication of what frequency range this foam is best suited for?

Also, any word on whether Dow has any plans to market this material in sheet form? Or will it be sold only as an injectable cavity foam?

Finally, how does the cost of the soy-based polyurethane compare to petroleum-based polyurethanes? This will definitely be a big factor in its acceptance.

Thanks for an article on an interesting topic.

Beth Stackpole
User Rank
Blogger
Removing the burdens around sustainable design
Beth Stackpole   7/30/2012 8:06:25 AM
NO RATINGS
Love to see these efforts around creating renewable versions of proven materials and carrying over many of the same characteristics so they have high utility for materials engineers. Makes it very easy to go the sustainability route when the choices are just part of good, everyday design practices.

<<  <  Page 2/2
Partner Zone
More Blogs from Engineering Materials
NASA's MAVEN spacecraft has entered Mars' atmosphere, carrying instruments to help Earthlings figure out what happened to it. Launched last November, the spacecraft arrived at the red planet right on time after a journey of 442 millionmiles.
More bioplastic materials have entered the 3D-printable filament fray. These PLA formulations reinforced with wood or bamboo fibers will debut at the October Composites Europe show in Germany.
Airbus Defence and Space has 3D printed titanium brackets for communications satellites. The redesigned, one-piece 3D-printed brackets have better thermal resistance than conventionally manufactured parts, can be produced faster, cost 20% less, and save about 1 kg of weight per satellite.
At IMTS last week, Stratasys introduced two new multi-materials PolyJet 3D printers, plus a new UV-resistant material for its FDM production 3D printers. They can be used in making jigs and fixtures, as well as prototypes and small runs of production parts.
GE Aviation not only plans to use 3D printing to mass-produce metal parts for its LEAP jet engine, but it's also developing a separate technology for 3D-printing metal parts used in its other engines.
Design News Webinar Series
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Oct 20 - 24, How to Design & Build an Embedded Web Server: An Embedded TCP/IP Tutorial
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service