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Ceiling Material

Floating Covers

Q: What materials are typically used for floating covers?
A: The industry standard for floating covers is generally 30-80 mil geomembranes. Depending on specific site details and requirements, we have several options for this application. Our most common geomembrane for floating covers is our 30 to 45 mil reinforced LLDPE polyethylene called Dura-Skrim® J-Series or K-Series. These membranes make a great choice by exceeding the performance and strengths of much thicker non-reinforced materials and keeping the overall handling weight down.
Q: How long can a typical Raven floating cover last in an exposed application?
A: Many of our liners are appropriately stabilized to survive up to 20 years or more in the Continental U.S. Your project location and details will help to determine the expected longevity for your application.
Q: What size covers can Raven Produce?
A: This depends mainly on the material being used. Maximum panel size is primarily governed by weight. We can produce large custom sized panels up to 6,000 lbs to meet your dimensions. Please contact us to discuss your project details and obtain our recommendations for your cover dimensions.
Q: What color covers are available from Raven?
A: We have white and black materials in our standard product lineup and offer many other custom colors available with minimum order requirements.
Q: What is the difference between HDPE and LLDPE Geomembranes?
A: The primary difference between LLDPE (Resin density between 0.917 and 0.924) and HDPE (Resin density between 0.934 and 0.939) geomembranes is flexibility. The ability to conform to irregular surfaces, ease of welding, and stress crack resistance are additional advantages of LLDPE. Selection of one or the other will depend upon your project detail requirements. For instance, if you are lining a pond or pit, you will need a liner that is flexible and conforming as well as highly tear and puncture resistant. After your liner is installed the importance of stress cracking resistance and UV stabilization will be relevant in helping your liner perform as expected.
Q: Why should I choose Raven materials over other suppliers?
A: As with most products in the marketplace, all geomembranes are not made with the same level of quality in areas of design, raw material, manufacturing, and quality assurance. Raven uses high quality carbon black, stabilizers, and resin to enhance material performance. Our products are all tested to meet high standard requirements through our ISO9001:2008 certified quality management system and verified by quality control testing in our Geosynthetic Institute certified laboratory.

Grain Covers

Q: Isn’t plastic just plastic?
A: No. Even though a number of companies want you to believe that “it’s just plastic”, there are a number of major differences within materials out in the ag marketplace. Being able to compare test values is a good first step. If a company is not prepared or doesn’t want to provide a product data sheet, it should be a red flag as to the type of product it is. Raven post all product data sheets right out on our website to assist customers and will send a physical sample of material upon request.
Q: What do the ASTM test methods mean to me?
A: The ASTM (ASTM International, originally known as the American Society for Testing and Materials) standardized test methods are used so a fair comparison can be made between products manufactured by various companies. You can learn more about the actual test methods by visiting our Learning Center feature and clicking Test Procedures. Reputable manufacturers will normally always provide a product data sheet with the standard ASTM test methods used for their industry.
Q: How do I purchase materials from Raven?
A: The most common way for you to purchase plastic from Raven Industries, Inc. is to contact your local Raven distributor. If you don’t know who that is, feel free to use the Find Distributor option at www.ravenag.com to request a distributor contact you. Another method is to utilize the www.buyplasticnow.com website, but if you use large quantities of material, you are far better off contacting a distributor that brings the product in with larger quantities to minimize the freight per roll cost.
Q: What is the largest size grain cover I can purchase?
A: Raven is well known for its ability to produce extra large hay covers to fit your pile. Raven can produce panels up to 5,000 lbs in widths of 200’ plus, depending on the thickness along with lengths up to 500’. The overall size of the pile being covered will dictate how many panels would be required.
Q: Does Raven make covers that will fit round piles or ring lift systems?
A: Yes, we manufacture covers that eliminate the “waste” on the corners by making a step tarp. For the ring lift systems, we use our technology to get the covers made, but we do utilize one of our distributors to handle the information gathering and sales aspect of the ring lift systems.
Q: Does Raven specify installation guidelines?
A: We offer some guidelines for putting the grain covers on. Most facilities have their own preferred method, so this is purely informational.
Q: How do I unroll a Raven Grain cover?
A: The normal method to unroll the cover is to pull it up and over the peak of the grain pile (width) and then unfold the length.
Q: How do I connect two or more Raven Grain covers?
A: The most typical method of connecting Raven grain covers is to sew them. Most facilities are equipped with a sewing machine for installation.
Q: What is an MSF?
A: In the plastic industry, MSF is a common term used, when pricing material. It simply stands for thousand square feet. The “M” is the Roman numeral for thousand. “SF” simply is the abbreviation for square feet.
Q: Can everyone who sells plastic manufacture plastic?
A: No. There are a number of companies that want you to think they are manufacturers of plastic, when in reality they simply convert materials. Raven extrudes (makes the plastic) as well as converts for your specific needs.
Q: Why would it matter if we buy plastic from a convertor instead of a manufacturer?
A: An actual manufacturer can guarantee high quality control and product consistency within a factory controlled environment. Our QA and production departments are continually verifying the extrusion process is meeting the specification requirements. All our covers are manufactured under the strict guidelines of our ISO 9001:2008 certified management system. A convertor many times will purchase the raw material goods based cost to maintain their overall profit margins and selling price.
Q: Wouldn’t a heavier/thicker cover be better?
A: While it would seem logical that a thicker grain cover would be better, the more important variable is what different types and grades of plastic resins are used. Many lighter weight high performance plastics can easily exceed the strengths of a much heavier plastic and would be easier to install. In some particular applications a thicker cover may be recommended, if certain conditions are going to be present.

Hay Covers

Silage Covers

Waste Lagoon Liners

Q: What materials are typically used for Lagoon Liners?
A: The industry standard for lagoon liners is generally 30-80 mil geomembranes. Depending on specific site details and requirements, we have several options for this application. Our most common geomembrane for lagoon liners is our 36 to 45 mil reinforced polyethylene K-Series or non-reinforced polypropylene geomembranes.
Q: Someone told me they had used an 80 mil HDPE liner. Is this the best way to go?
A: Although this is included in the standard line of materials used in this type of application, it would not be our recommended liner due to the heavy weight and non-flexible characteristics of a high density polyethylene. Raven provides several options for this application and all of them include excellent flexibility characteristics. Our reinforced Dura-Skrim® K-Series far exceeds the strength of a much heavier membrane without the weight and handling issues during installation. Raven produces large factory welded panels up to 6,000 lbs to closely meet your lagoon size limiting or eliminating the need for field seaming.
Q: How long can a typical Raven lagoon liner last in an exposed application?
A: Many of our liners are appropriately stabilized to survive up to 20 years or more in the Continental U.S. Your project location and details will determine the expected longevity for your application.
Q: What size liners can Raven Produce?
A: This depends mainly on the material being used. Maximum panel size is primarily governed by weight. We can produce large custom sized panels up to 6,000 lbs to meet your dimensions. Please refer to our website’s liner calculator feature for an estimated panel size and then call a Raven representative for more details.
Q: What color liners are available from Raven?
A: We have white and black materials in our standard product lineup and offer many other custom colors available with minimum order requirements.
Q: My spec calls for a liner meeting the GRI GM17 Standard. Do your liners qualify?
A: The term “GRI” stands for Geosynthetic Research Institute. This organization sets several standards for the geomembrane industry such as GM17. Materials must meet stringent requirements to qualify for these standards. Raven Industries does provide several materials that meet these standards. Please contact a Raven representative for further details.
Q: What is the difference between HDPE and LLDPE Geomembranes?
A: The primary difference between LLDPE (Resin density between 0.917 and 0.924) and HDPE (Resin density between 0.934 and 0.939) geomembranes is flexibility. The ability to conform to irregular surfaces, ease of welding, and stress crack resistance are additional advantages of LLDPE. Selection of one or the other will depend upon your project detail requirements. For instance, if you are lining a pond or pit, you will need a liner that is flexible and conforming as well as highly tear and puncture resistant. After your liner is installed the importance of stress cracking resistance and UV stabilization will be relevant in helping your liner perform as expected.
Q: Why should I choose Raven materials over other suppliers?
A: As with most products in the marketplace, all geomembranes are not made with the same level of quality in areas of design, raw material, manufacturing, and quality assurance. Raven uses high quality carbon black, stabilizers, and resin to enhance material performance. Our products are all tested to meet high standard requirements through our ISO9001:2008 certified quality management system and verified by quality control testing in our Geosynthetic Institute certified laboratory.