Tear strength pli

Please note: When comparing different types of foam with other companies it is most important to look at the density and ILD of the foam. Foam density is a specific measurement of how much weight in pounds polyurethane foam can handle per cubic foot.

This density rating tells you the strength of the foam. The height the number the longer the foam will last. It should not be used exclusively as a sign of durability or comfort, because firmness and lifespan of foam products like mattresses and cushions, depend on many factors, including density.

The density may very slightly between each foam shipments.

Understanding TPEs

The higher number the foam is, the firmer the foam is. Also represents how many pounds the foam will hold before it collapse. Made in the USA. Open Cell Foam Specs Foam specification comes from foam manufacturer.

tear strength pli

The specs below are all closed cell foam. The difference between open cell and closed cell foam… Open-cell foam is soft — like a cushion. The cell walls, or surfaces of the bubbles, are broken and air fills all of the spaces in the material. Closed-cell foam has varying degrees of hardness, depending its density. It is strong enough to walk on without major distortion. Most of the cells or bubbles in the foam are tight like a soccer ball or a kids pool noodle. We do not possess extruded polystyrene.

Foam specification comes from foam manufacturer. D C D D —- —. Polyethylene Foam Planks Foam specification comes from foam manufacturer. We do not possess extruded polystyrene Foam specification comes from foam manufacturer.

C or 0. F D 0. It offers excellent flexibility and resilience. Anit-Static Packaging. Visco Polyurethane Foam. Light Charcoal. Dark Charcoal. Tensile pis Min. Tear PPI Min. Specification s:.Static physical testing does not tell the entire story about how a material will work in a particular application.

Rarely will an application resemble a static test such as tensile strength. In use, parts will see combinations of affects, i. Tensile Testing ASTM Dalso known as tension testing, subjects the specimen to controlled tension until failure. Ultimate elongation, or how far the material can stretch, is measured during this test as well.

Tear Strength Testing measures the materials resistance to tearing while the machine is pulling the specimen apart. The Die C test, while it is the most common method, experience tells us that it is not as strong an indicator of field performance as the Trouser Tear test.

The taber test involves two abrasive wheels that are lowered onto the specimen, and as the platform rotates, the test material begins to abrade away and wear marks become visible. Taber abrasion is measured in mg loss. One should note wheel, load, and cycles to make comparisons.

Taber results should be thought of in ranges, not in hard quantitative results. Meaning 20mg and 22mg are effectively the same but 20mg and 40mg are significantly different.

Bayshore Resilience ASTM D measures the rebound characteristics of an elastomer by bouncing a projectile on a sample part. High Bayshore resilience generally implies low heat buildup in the material when used at high speeds under high loads. Beside the chemical itself, there are a multitude of factors which can affect chemical resistance of an elastomer such as: ambient temperature, strain, method of exposure, duration of exposure etc.

Link to Chemical resistance. Along with Mechanical testing, Pleiger offers analytical testing to identify chemical composition of urethanes.

For more information on all of our polyurethane testing servicesplease contact us today. Polyurethane Testing Search this website. Notched Die.It has a low viscosity for easy mixing and pouring. This product cures at room temperature with negligible shrinkage. They are good for making simple one or two-piece block molds.

tear strength pli

Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Wear vinyl gloves only. Latex gloves will inhibit the cure of the rubber.

Storing material at warmer temperatures will also reduce the usable shelf life of unused material. These products have a limited shelf life and should be used as soon as possible. Premix Parts A and B thoroughly before using. Cure Inhibition - Silicone rubber may be inhibited by certain contaminants in or on the pattern to be molded, resulting in tackiness at the pattern interface or a total lack of cure throughout the mold.

If compatibility between the rubber and the surface is a concern, a small-scale test is recommended. Apply a small amount of rubber onto a non-critical area of the pattern.

Inhibition has occurred if the rubber is gummy or uncured after the recommended cure time has passed. Materials found to cause cure inhibition include sulfur-based modeling clays and latex rubber.

To prevent inhibition apply a sealing agent.

tear strength pli

Applying A Release Agent - Although not usually necessary, a release agent will make demolding easier when pouring into or over most surfaces. Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question. After dispensing equal amounts of Parts A and B into mixing container, mix thoroughly for 3 minutes making sure that you scrape the sides and bottom of the mixing container several times.

Mixture should have a uniform color with no color streaks. If you observe color streaks, continue mixing until they are eliminated. Pouring — For best results, pour your mixture in a single spot at the lowest point of the containment field. Let the rubber seek its level up and over the model. A uniform flow will help minimize entrapped air.

Allow mold to cool to room temperature before using. Using The Mold — No release agent is necessary when casting wax or gypsum. Casting abrasive materials such as concrete will quickly erode mold detail, while casting non-abrasive materials wax will not affect mold detail. Before storing, the mold should be cleaned with a soap solution and wiped fully dry. Two part or more molds should be assembled. Molds should be stored on a level surface in a cool, dry environment.

Mold box construction, model preparation and release agent application for a 2 part pour on mold are covered in this video. A "Cold Cast Brass" handle is molded and cast for a fraction of the cost of replacement. Features Convenient one-to-one by volume mix ratio no scale necessary Low viscosity for easy mixing and pouring. How-To Articles video.Tear resistance or tear strength is a measure of how well a material can withstand the effects of tearing.

ASTM D can be used to measure the resistance to the formation of a tear tear initiation and the resistance to the expansion of a tear tear propagation. Regardless of which of these two is being measured, the sample is held between two holders and a uniform pulling force applied until the aforementioned deformation occurs. Tear resistance is then calculated by dividing the force applied by the thickness of the material.

Materials with low tear resistance sometimes have poor resistance to abrasion and when damaged will quickly fail this includes hard materials, since hardness is not related to tear resistance. Substances with high tear resistance include epichlorohydrinnatural rubber and polyurethane.

In contrast, materials such as silicone and fluorosilicone have low tear resistance. The ratio of tear resistance to the yield strength is called the tear-yield ratio. It is a measure of notch toughness. This material -related article is a stub. You can help Wikipedia by expanding it.

From Wikipedia, the free encyclopedia. Archived from the original on 25 May Retrieved 15 June ASM International. ISBN Categories : Solid mechanics Deformation mechanics Materials stubs. Hidden categories: CS1 maint: archived copy as title Use dmy dates from August All stub articles. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file.

tear strength pli

Download as PDF Printable version. Add links.Metric Conversions are dependant on the test method that is being converted. For Geotextiles and Geomembranes we need to know what the test method is before we can convert. An understanding of both the test method and the material being tested is often required for correct interpretation.

This tech note discusses some of the more usual conversions. A conversion chart at the end of this tech note shows the various conversions. For force measured in psi you will also need to know the thickness of the sample tested psi converts to kPa.

This test always provides values in unit pounds of force lbs converts to N. An example for 30 mil PVC would look like this. These are very different tests and provide different values. Design calculations using Geotextile strengths should always use wide width Tensile test results.

Polyurethane Material Properties

Geotextile burst tests measure the pressure required to burst a Textile on a specific bursting machine. Ball Burst values are reported in pounds of force lbs converts to NMullen Burst values are reported in pounds per square inch psi converts to kPa.

There is no correlation between the two tests. AOS is a measure of the filtration size of a Geotextile. Conversion from US sieve sizes to metric opening sizes should be done with a conversion chart. Login Contact Us. Metric Conversions Metric Conversions are dependant on the test method that is being converted.

Geomembranes 1. Geotextiles A. Metric Conversion Chart. Note: Factors in bold type are exact conversions. Factors in normal text are accurate to the number of significant figures shown.These products are compatible. Applications include reproducing sculpture, architectural restoration, making candle molds, casting pewter, etc.

Note: These products will not work with modeling clays containing sulfur under any circumstances. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Wear vinyl gloves only. Latex gloves will inhibit the cure of the rubber. Warmer temperatures will drastically reduce working time and cure time.

Storing material at warmer temperatures will also reduce the usable shelf life of unused material. These products have a limited shelf life and should be used as soon as possible. Cure Inhibition - Addition cured silicone rubber may be inhibited by certain contaminants in or on the pattern to be molded resulting in tackiness at the pattern interface or a total lack of cure throughout the mold.

Latex, sulfur clays, certain wood surfaces, newly cast polyester, epoxy or urethane rubber my cause inhibition. If compatibility between the rubber and the surface is a concern, a small-scale test is recommended. Apply a small amount of rubber onto a non-critical area of the pattern. Inhibition has occurred if the rubber is gummy or uncured after the recommended cure time has passed.

To prevent inhibition, one or more coatings of a clear acrylic lacquer applied to the model surface is usually effective. Allow any sealer to thoroughly dry before applying rubber. If you are not sure if your clay contains sulfur, do a small compatibility test before using for an important project. Applying A Release Agent - Although not usually necessary, a release agent will make demolding easier when casting into most surfaces. Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.

Before you begin, pre-mix Part A and Part B separately.

Polyurethane Testing

After dispensing required amounts of Parts A and B into mixing container 1A:1B by volume or weightmix thoroughly making sure that you scrape the sides and bottom of the mixing container several times. The rubber should be a uniform color with no streaks. Applying The Rubber - This product must be applied in layers. Using a stiff brush, the first coat of rubber should be applied in a very thin layer to capture intricate detail.

Use dabbing strokes, especially around undercuts, to reduce entrapped air. Subsequent coats will add strength to the mold.

Tack-time can be reduced with mild heat hair dryer or heat gun. Repeat until the necessary mold thickness is achieved. Coverage: 1 gal. Ensures that you apply a thorough coating each time and help build uniform layers.Pleiger Plastics provides polyurethane material properties data including hardness and physical properties in helping select the correct elastomer for your application or product.

Standard Color is amber, however this product is not color stable. The one setback of the material is that it takes a high compression set. Only available in natural color cream. Typical applications are bumpers, diaphragms, rollers, and hydrocyclones.

Leather testing to ISO Standard 3376 - tensile strength and percentage elongation

Plei-Tech 15 offers excellent abrasion and cut resistance, and is well suited for high dynamic loading. This product is also available as a foam which has tremendous dynamic performance and abrasion resistance. This compound has MSHA approval.

Color is natural which is light brown that turns dark brown when exposed to UV light. No properties are lost in this color transformation. This compound is MSHA approvable. Standard color is natural creamhowever color coding is available. Typical applications are scrapers, snow plows, and squeegees.

Quick Mender® X.O. Repair Polymer

Typical applications are scrapers and sheets. This product has general MSHA approval. Standard color is blue, however this material is not color stable. Typical applications are bumpers, balls, and hydrocyclones. Lubrithane is a polyurethane with special additives to provide a reduced coefficient of friction. Lubrithane is ideal for belt scraping applications because of good abrasion resistance and a low coefficient of friction.

Color is black. This product has tremendous dynamic performance and abrasion resistance and is used where high frequency low loads are present. Density ranges are from. This material is ideal for bumpers and cushions which require high displacements. Color is natural which is light brown that turns to dark brown when exposed to UV light. Polyurethane Material Properties Search this website.


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