The problem is it ‘remembers’ too well Compressive strength or compression strength is the capacity of a material or structure to withstand loads tending to reduce size, as opposed to which withstands loads tending to elongate. The cushions should 28 by 28 roughly. To evaluate a foam product for potential use in a comfort application, possibly the most useful testing value to take into consideration is its compression strength. Yes, you could go with that foam type for your application. I have a glider that has 4″ seat and 3″ back. Can you suggest me what foam has to be used? I would like a cushion that prevents that. I need to replace all the foam. I need a 24″ x 84″ piece of foam for a bench seat. What type and density of open cell foam would be recommended for this retrofit? In 3 key fire tests - ASTM E84, NFPA 285 and NFPA 286/UL 1715 - polyiso performs exceptionally well. Thanks! The article link will be included in the email automatically. Please Contact Us for more information on the foam for your application. The effects of foamed concrete density, cement type and content, water/cement ratio, foam type and curing regime will influence the compressive strength. I have a Bassett leather sectional sofa and one of the modules gets the most wear. Along with ILD, Density can help you find the perfect foam for creating a better mattress, pad or cushion. I’m looking for a compressed foam similar to a “yoga” block. Do u know what type it is. Otherwise we would suggest our dryfast foam for your application. Our suggestion would be the HD36-HQ medium foam for your application. We sell these layers as our memory foam mattress combinations. I did not have any pain as long as I lay down on that table. I want to use a foam rubber core with a feather blend top and bottom-what should I be using for the core? What foam would you suggest? Keeping in mind that it will probably be slept or napped on. You carry so very many closed cell foams; difficult to choose. The evaluation of compression strength is called Indentation Load Deflection (ILD), also called Indentation Force Deflection (IFD), but both refer to the same test. I have a 3″ thick TEMPUR-ADAPT foam Topper & am looking to put as thin of a base as possible under it for sleeping out of my SUV. Maintaining this consistency across every test is important because foam materials can bear weight and pressure differently depending on thickness and size, even if the sample is cut from the same bulk material. Maintaining sample size consistency is particularly vital when testing foam because thickness and size of a material affects the ability to bear weight in a different way for every foam. The dry density of foamed concrete may vary from 300 to 1600 kg/m3. > more IKO enertherm MG has a mineral-coated glass fibre facing and achieves a declared compressive strength of 150 kPa. The lowest ILD values are the softest foams, requiring a minimal amount of weight to be compressed. They have a tensile strength of 65-75 psi, compressive strength of 45-55 psi and R-value of 6.9 per inch. But I need it on a large scale application. This value is a comparison ratio between the 25 percent compression value and a deeper 65 percent degree of compression. My husband needs something softer but still more supportive than the soft talalay latex we have now. These values help categorize materials by placing them along a numerically categorized spectrum, making purchase decisions easier, even when physically feeling the foam yourself is not an option. Closest foam we have available is our 3lb cross linked polyethylene foam. I want a foam cushion that when compressed will be standard chair height of 18″. Thanks. 4″ or less, we would suggest our firm lux foam. We are building a banquette in our dining room. Please advise what a piece of this 27″ x 76″ would cost. I am also using memory foam for the top layer. I’m looking for a 2 inch thick foam topper so that when a 120lb person sits down on it, it compresses to no more 19.25 inches. See custom cut seats and cushions for pricing. What would you suggest? Cost is not a consideration. It remains one of the most important however, since firmness, feel and support are the characteristics a user is going to most easily recognize and have an opinion on. The mechanical strength of EPS varies with its density. We love the sectional, but the foam in the seats have already worn out and are mushy! Looking to make a piece of equipment for the gym. With Foam Factory Custom Couch Cushions, Even Your Oldest Furniture Can Feel Like New! Will a 1″ thick ILD 54 work? Then again, perhaps I will sink in the HD36-HQ. For static loads, 3:1 is suggested. I am making 4 Bar Height benches. And because 65 percent compression represents real-world use better than 25, the combination value is very helpful in understanding how you can expect a foam to perform. GREAT discussion. The closest match I would say is our 1.2lb density polyethylene foam. I’m about 200 lb with gear on. Because the ILD values directly correlate to the weight needed to compress the foam, not only can people use those values to interpret the feel of a foam, they can also understand what these values actually mean. Many types of foam have similar 25 percent ILDs but very different 50 percent ILDs. The foam that I would suggest for your application is our Super Max Foam. I sit on a small sofa all day every day for my work on a laptop. The HD36 Regular or HQ foam is what we would suggest for your application. ASTM C578 Types and Physical Properties for FOAMULAR® XPS (106 KB, PDF) FOAMULAR® Extruded Polystyrene Insulation For … what kind of foam they use. Larry Lapham. They don’t get rained on, but of course are subject to humidity and cool temps. It could work, as long as you drill holes, about 1″ in diameter, throughout the closed cell foam layer. These materials are used predominantly as a pillow or in body wedges where the product needs to support weight while offering the most comfort. If the foam is to be 3″ deep, what density would be required so that and adult of 200lbs would not compress the foam more than 1.5″ when sitting on the bench? The mechanical strength of EPS varies with its density. I just purchased a couch, but the cushions go down to just about 1.5″ and I can almost feel the springs beneath it. I am restoring an antique Morris chair. I would suggest our Lux-HQ foam for your application. The F-400 is used in applications such as areas with heavy traffic, including roads, streets and lorry terminals. You can order that on our custom cut cushion page. Neoprene is too stiff in any thickness tho it’s good for edge support. A common question with rigid foam insulations is how well it resists water. The indenter pushes into the foam until it is compressed 1 inch, 25 percent of the sample’s height. One bike has rear suspension and the other does not and I don’t want the foam to compress after an hour or two of riding. We are thinking about replacing the seat cushions in our large sectional. This means they are capable of bearing static, evenly distributed loads of approximately 17.5 tonnes/m 2 and 15 tonnes/m 2 respectively without failure. I don’t know whether to replace the back foam. The compressive strength of foam concrete determined at 28 days, ranges from 0.2 to 10N/mm 2 or can go higher. These are primarily used in seating cushions, automobile seating and the firmest mattresses, where support is top priority. The average aged R-value of closed cell SPF is around 6.0/inch. The F-400 is also used in parking areas, where no load-balancing topsoil layer (minimum thickness: 300 mm) is laid on top of the insulation boards. Foam materials with ILD values in the 50s and higher are the most supportive and firmest types. The F-400 has a short-term compression strength of over 400 kPa, which means approximately 40,000 kg/m², and a long-term compression strength of over 180 kPa, approximately 18 000 kg/m². How boring guys like me are trained to go into considering a material or product for integration into a system under design. Ah-hem… HELP!? Because foam is going to be compressed by 65 percent more often in real-world use than 25 percent, this combination generates a performance value while still utilizing the 25 percent ILD. These types also can be used as pressure relief cushions when a little extra support is also desired in addition to the comfort. after cut” 15.3 inch; Tensile strength – 90 lbs per sq. The lower foam layer is 5 inches and the loosely attached topper is 2 inches. If 50 pounds are required to compress the sample 25 percent, its ILD value is 50. Knowing how to interpret ILD values can make selecting the right material much easier, which can save you time, effort and even money. This is tested because compression is not necessarily linear, so you cannot simply double the 25 percent compression value to know how it responds to greater pressure. These clear results signified good elasticity of the PP-β foam with continuous polygonal cell morphology. You can price out and order custom cut cushions for your couch on our website. Can’t attach pic…. This article presents a detailed comparison of experimental data and numerical models for the dynamic compressive strength and crushing properties of expanded polystyrene foam with different strain rate and different temperature. The most important aspect of this evaluation is ensuring that a proper sample size is tested. Is HD36 or to use? You can custom order this foam on our seats & cushions page. For medium, go with our HD36 foam. The 25 percent value is divided into the 65, typically resulting in a value from 1 to 3 that more accurately represents support capability than a single test. Compression is not linear, so doubling the 25 percent ILD will not necessarily produce an accurate 50 percent ILD. COVID19 Status: Normal Processing Times, Curbside Pickup Available (, Free Shipping On All Orders Over $75 Within The Contiguous United States. For medium foam, we suggest HD36-HQ foam. I would suggest 1″ of our super max foam for your application. If you need very firm foam, it would be best to contact us for help with custom cutting our other options of very firm foam. But, keep in mind that I will lose about 15 lbs after the holidays, if that makes a difference. If I purchased new foam for the cushions, what compression would I need? Materials with support factors around 2 or higher are considered to be more supportive products. This foam is considered firm foam. However my mother-in-law in slight: 5′-8″ and 110 lbs. I used HR foam as a top layer on my side in 2014 and it is still going strong. Yet another test is support factor, which may also be called sag factor or compression modulus. Hi. Foam concrete can be defined as a cementitious material that consists of minimum 20 percent of foam, that is mechanically entrained into the plastic mortar. If I chose to replace, what foam would you advice? How would 8 inches of HD36-HQ Foam, plus 4 inches high dnsity memory foam feel like? I was thinking a bottom piece of 4 in higher density with maximum ‘recovery’. Looking for a 2″ foam to upholster the top of the bench. Most ILD values fall somewhere in the range of low teens up to the 60s and 70s. While only one of the various factors to take into consideration while evaluating a material for use in an application, compression strength remains one of the most important. Compressive strength – 50 lbs per sq. Thank you! What density foam would I want for a couch where a 300lb person sits regulary? Memory foam is typically used with a firmer conventional foam base, such as our Lux-HQfoam. What foam type would you recommend? I am looking for a foam type that would be able to roll/fold into a portable carrying bag. Frequently included along with the 25 percent ILD data is a 50 percent compression value, which is a measure of the pounds required to compress a foam sample half of its height. Saw this foam which I tested under a load. The physical properties of the foam will not change. A common type of XPS (such as Dow’s Styrofoam or Foamular from Owens Corning) and Type IX EPS is rated for 25 psi. Would your hd-36 6 inch be too soft for multiple hour tv binges sitting on my couch cushions? I have tried buying used motorcycle seats, savaging their foam but in the long run, they failed. Please Contact Us for more information on the best product for your application. I am worried Lux HQ might be too firm for her. These products are often used in a pressure relief system as seating pads, mattress toppers and chair backs where comfort is the exclusive goal. I weigh 200 lbs. Please contact us and provide additional details. We would suggest our Super Max Foam for your application. HD36 Foam is OK, as long as the foam is covered in plastic. Foams with these ILDs are firmer but still can provide pressure relief, so they are often made into a pillow or angle-boosting body wedges. The most integral aspect of this test is ensuring that the foam sample sizes are always identical in dimensions: 4 inches thick, 15 inches wide and 15 inches long. I need a 1.2meter X 0.4Meter foam to withstand a load of 4tons at 50% compressibility. There are many varieties of foam strength testing, but the primary one is the 25 percent compression test. The yoga blocks are about 700/800mm of very dense foam and I need it in sheet format. It was observed that the compression strength of aluminium foams scales near the percolation threshold with Tf ≈ 1.9 - 2.0 almost independently on the … I would suggest our T200 EVA Minicel Foam for your application. My question is this.. Do you have a chart that summarizes/categorizes the technical ratings/parameters of your various foams so we can proceed from this excellent discussion to making an informed choice of a specific foam? We would suggest either our firm Lux foam or our medium HD36 foam for your application. What wood you suggest? When evaluating a foam product for use in a comfort application, perhaps the most useful testing value for determining its usability is compression strength. As the main method of testing, if a material is simply stated as having an ILD value of “Z,” that refers to its 25 percent compression test results. We would suggest our eggcrate pet bed for application. This is a computer controlled performance evaluation, with standardization allowing all materials tested using this process to be measured against each other on a balanced plane. If 30 pounds are required to compress the foam 25 percent, its ILD value is also 30. The compression strength and rigidity modulus were measured for both foams. I am torn between your Lux foam HQ or HD36 foam. I weigh 375. Got anything that will work? It’s important to ensure that your material has adequate compressive strength to withstand day-to-day loads but going too high can mean a dramatic cost increase for very little – if any – gain. I’m a 40-year design engineer and appreciate the technical perspective taken in this. Check out Eggcrate Foam Pet Bed – Twill Cover. I would really love a more firm cushion and I’m wondering how hard it is to get it and what it would cost? inch; R-value – R7 per inch; Thermal resistance/heat retention – 72% @ 1”; 81% @ 1.5”; 90% @ 2”; 96% @ 3” Stop leaks @ 1” Eliminate condensation @ 1.5” Best energy payback @ 2” ELASTROSPRAY FE-348. 2 Vertical compressive strength is measured at 10 percent deformation or at yield, whichever occurs first. There are multiple ways foam strength is tested, but the most prevalent is the 25 percent compression test. Help!?!?! Any suggestions. What thickness and type of foam is needed for a 300lb individual to not compress a 16″ x 18″ foam area by no more than 1.50″ (or 50% whichever is greater)? For closed cell foam, no less than 1/2″ in thickness. Copyright © 2021 Foam Factory, Inc.. All rights reserved. I need firm mattress 2″ of 1″. On average, most ILD values fall on a spectrum from the low teens up to the 60s and 70s. After how many hours would the foam fully expand to gauge correct firmness? I would like to replace me patio seat cushions. A more common concern between these products is the compressive strength of the polystyrene, or the capability of your polystyrene to withstand size-reducing loads. I have a screened in porch. The modulus of elasticity was determined within the load range of 0.75 ÷ 2. I am 220 lb 5’10. I have a built in bench that is 82″ long, 21″ deep and 15 1/4″ high. If so, which closed cell foam would you recommend? ILD values in the 50s and greater are the most supportive and firm foam materials. Understanding how to interpret and use ILD values can make selecting the right foam product for you much easier. Thanks. Cushions will be partially exposed to weather (under a bimini top) so I plan to use Dry Fast foam. Thanks! The lowest ILD values indicate the softest and most cushioning foams, as they require the fewest pounds to be compressed. DENSITY AND COMPRESSIVE STRENGTH: Grade of FOAMGLAS® HLB insulation Nominal Lot Average Density Compressive Strength (Tested According to ASTM C240/C165, EN 826 Method A) Average Lower Specification Limit* kg/m3pcf N/mm2psi kg/cm2N/mm2psikg/cm2. Hi, I have back pain also had surgery. However, I would like a firmer cushion that lasts longer than Dry Fast, if possible, and am considering adding a 1″ layer of a closed-cell foam under a 2″ layer of Dry Fast. Samples must be 4 inches thick, 15 inches wide and 15 inches long. These values are the easiest way to categorize materials, making the selection of a foam type easier by narrowing the field and even helping make a purchase decision if the chance to feel the foam in person is not possible. Your email address will not be published. What do you suggest I use? iIs this the wrong combination.? With foam’s ILD values directly correlated to the weight needed to compress it, customers can use those  values to interpret the feel of a tested material type. What do you reccomend? However, the foam will provide less support, so you will feel the hardwood floor more with less foam. They are also utilized in mattresses, shredded foam filling or for orthopedic support. Compressive Strength. Company Site. Which one will work the best to not feel the edge of the seat? For open cell polyurethane foam, no less than 1″. Harbor Foam EPS is a closed-cell, lightweight and resilient, foamed plastic composed of hydrogen and carbon atoms. The foam needs to be able to be compressed, lightweight, but expand and be comfortable enough for a child weighing 40 pounds to lay on. Sarah Stevensob. Need to know what compression of supporting foam to use. Thank you! I prefer a hard and supportive foam, perhaps with a cushioned layer on top. ILD is only one factor out of many that should be taken into consideration while evaluating a material to see if it will perform the way you need it to. I am needing a 1″ foam for western saddle seats that is medium firm and does not compress flat under the riders pelvic bone points. I am building my own bed! I would like to make a dog bed that can roll up as easily as possible for travel and is comfortable for a 50 lb dog. They are also used in mattresses, shredded foam stuffing and in orthopedic support products. The test is executed by a circular metal indenter applying downward force into the foam sample as it rests on a flat surface. We suggest either the HD36-Regular (Medium) or the Lux-Regular (Firm) foam for your application. This is the test being referred to anytime foam is stated to have an ILD value. It is to be used as a cushion at our home. ILDs in the high-20s to the mid-40s generally mean the foam carries a balance of comfort and support. The most important mechanical property of EPS insulation and building products is its resistance to compressive stresses, which increase as the density becomes higher. What foam would you suggest that could support me – but no be to firm for my mother in law? Rebond foam or Super Max Foam is suggested for your application. Despite what may seem to make sense, ILD does not indicate the quality of a given material. the foam were strain-rate independent in both works. Your email address will not be published. I am in the process of converting an 2 existing futon mattress (twin) made of cotton layers into a tufted mattresses that can be stacked up and used as a daybed or opened up into a larger bed. ... Compressive properties include the compressive strength, maximum compressive deformation, and the compression modulus, which describes the short-term deformation under load. Hi, I am disabled and need a booster cushion to take with me when out of the house. Firmness, feel and support are the characteristics foam users are going to be most sensitive to and the ones that dictate if they like the material they have selected or not. Since Styrofoam™ Brand Extruded Polystyrene Foam Insulations are visco-elastic materials, adequate design safety factors should be used to prevent long-term creep and fatigue deformation. Hello, They formed quickly but compressed to nothing after an hour. Many varieties of foam have similar 25 percent compression ILDs and completely different 50 percent ILDs. About how many years of wear could I expect to get from it? Closed cell SPF can be used to enhance the racking strength of most wall and ceiling assemblies. To conduct the test, a circular metal indenter applies downward force into the testing sample resting on a flat surface until the foam is compressed 1 inch (25 percent of the sample’s 4 inch height). ZwickRoell offers testing solutions to determine the compression properties of hard foam to ISO 844, ASTM D1621, EN 826. Background: The shear properties of rigid polyurethane (PU-R) foams, routinely used to simulate cancellous bone, are not well characterized. 3″ should be sufficient. The memory foam would allow for softness but the firmer regular foam would supply support. Tags: Foam Firmness, Foam Hardness, Foam Testing, ILD, Technical. I need a piece of foam that is 13.25 inches thick, 20 inches long, and 19 inches wide that firmly supports weight up to 200lbs. 5″ or greater, we would suggest our medium HD36 foam. The seat is supported by 8 way tied copper coil springs covered with coconut husk, burlap and finish material. These are most commonly used in seating cushions that bear the full weight of a body centered on a smaller area, automobile seating and the firmest bedding materials. Compression strength is evaluated through a test called Indentation Load Deflection (ILD), also known as Indentation Force Deflection. There are many varieties of foam strength testing, but the primary one is the 25 percent compression test. Understanding and using both of these two qualities, will however, make you very well equipped to find the right material for making a better mattress, cushion or seat. And where do I find the cost? There are multiple ways foam strength is tested, but the most prevalent is the 25 percent compression test. You can price out and custom order that through our seats and couch cushions page. I was thinking about 4 or 5 inches thick. I’m 5’9″ & weigh 135 lbs. I am making knee pads and don’t want them to be bulky. We value your advice. The modeling was done in LS-DYNA . I’ve already tried different densities of medical foam. The compressive stress–strain behaviour of these foams has been investigated over a wide range of engineering strain rates from 0.01 to 1500 s−1in order to demonstrate the effects of foam density and strain rate on the initial collapse stress and the … I want the very highest quality, long lasting foam that will meet those requirements. Do you think this will work? EPS has a compressive resistance between 10 - 60 psi … Would it be safe to say that if I needed polyurthane foam for a Physical theraphy table top that would support 200 pounds very well; it could be 2″ thick and have a 26 density and about 45 compression? person over four hours of card playing. FOAMULAR® is a popular energy saving, moisture resistant, XPS insulation from Owens Corning.The difference between 150 and 250 is simply the compressive strength of each type. What is Foamed Concrete? Thanks in advance for your help! We would suggest our firm Lux-Regular or firm Lux-HQ foam for your application. The foam will be 22″ x 75″. The foam that would closely match your requirement is our HD36-Regular or HD36-HQ foam. Additionally, testing products of different dimensions eliminates the test’s control and, in turn, the ability to evenly compare results from one material to another. What foam combo will best suit this? There are other compression strength evaluations in addition to the 25 percent compression test that can provide even greater insight into a material. I have no idea what my ild is, but it is VERY firm. & bottom out a but on the Topper sleeping on my side with it right on a hard surface. It has 2 types of foam and corrugated zig-zag suspension spring suspension. Currently sleeping on 3, 4 inch layers of ‘memory’ foam. You can custom order foam mattresses on our website. How is this calculated, generally? Which one would you suggest? FOAMULAR Extruded Polystyrene (XPS) Rigid Insulation is made in Canada and offers a combination of characteristics that result in long-term thermal performance of R-5 per inch, compressive strengths of 20 100 PSI and exceptional moisture resistance. You can price out and customer order this cushion on the custom seats and cushion page of our website. Hi – I am interested in buying a sheet of HR foam, 3 inches in depth, to replace a top layer on my husbands side of our diy latex mattress.