Plastic Strip is common in other materialsPlastic Strip, plastic Strips and Plastic Tapes, Plastic Bar

A common standard item in the metals industry is ‘strip’. Strip is normally a piece of material that is 1/16″ – 3/8″ thick and 1.0″ – 4.0″ wide, although thicker and wider materials can also be referred to as strip. The metals industry produces various metals in these sizes of strip. In the plastics industry, strip is something we cut from larger sheets. The sizes are the same as listed above, but are cut from 48″ X 96″ or 48″ X 120″ sheets.

The a few of the most common plastics materials we cut to plastic strips are:

HDPE (High Density Polyethylene)

PTFE, TFE (Polytetrafluoroethylene)

UHMW – Ultra High Molecular Weight Polyethylene

Acetal / Delrin

Nylon – Polyamide

PVC – Polyvinylchloride

Polycarbonate – Covestro (Bayer) Makrolon

Most plastics can be cut to these strip sizes, with various lengths available depending on type of material. In some materials and in some sizes, depending on quantity, special run to size plastic strip is available. These special run plastic strips can be run to almost any length. Specifically, in the UHMW and PTFE materials, much longer lengths are available in rolls of material. The UHMW can be purchased in standard and adhesive back varieties. This UHMW with adhesive is a commonly used item in the wear strip applications because of its ease of installation. A large market for this kind of strip is in the food processing industry for all wear points and to reduce noise in the plant. Some of these same sizes with adhesive on the back are available in the PTFE, and are available in long tape style rolls. In some cases, colors other than natural are available, contact us for details. Plastic Strip, plastic bar, excellent in food processing and material handling

Plastic Strip and Strips are available in special sizes

With the massive range of plastics available, and most of these materials available to be cut to strips, the nearly unlimited amount of choices in plastic strip availability make this post difficult to be all inclusive. Great material for the industrial, food processing, material handling, automotive and recreational industries.

Most plastics are available in large sheets, and we can cut these sheets to strip for you. Also, depending on the material, size and quantity, we can custom extrude your strip in longer lengths and to your requirements. Decide on a type of plastic, determine the size and quantity, and give us a call. Use your imagination, we can help.

If you have a project where strips would be ideal, please contact us to see if the type of material you need is available in the strip configuration that would be beneficial. Call us at: 866-832-9315 or drop us an email and we will be happy to go to work on your requirement.


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Topic: Plastic Strip and Plastic Strips – Strip Plastics

Delrin Homopolymer versus Copolymer Acetal

Have you noticed the little plastic gears in your watch, the working parts in a garden hose nozzle, audio and video cassette moving parts, food slide components, timing screws and pumps parts, or perhaps even acoustic guitar picks? If you have, then you have seen perhaps the most versatile plastic known as Acetal (polyoxymethylene or POM). It is an extremely durable and strong plastic material, so it is no surprise to see it being used for so many different things. Used as a regular replacement for many aluminum or metal parts, or the similar plastic materials, like Polyamide Nylon or Rigid Polyester. It is the next step up from HDPE, a common plastic used in food processing. Because of the uniform molecular structure of Acetal, it can be used for different applications that might require a plastic material to be more rigid, have good mechanical properties and have a low coefficient of friction.Machining Copolymer Acetal or Delrin Homopolymer Acetal Rod

The battle between Delrin and Acetal

Both Delrin and Acetal materials are thermoplastic. What this means a material can be softened by being heated and when cooled becomes hard again, and will retain the new shape. Because of this characteristic it is able to be molded in to many different types of objects, like the few listed above. While some thermoplastics are ‘formable’, Acetal is definitely not to reshape with heat after it is made into a sheet or rod. A crystalline, rather than amorphous type resin is used to make acetal. Because of the uniform molecular structure of Acetal, it can be used for different applications that would require a plastic material to be more rigid, have excellent mechanical properties and have a low coefficient of friction. Both of these resins are produced in Natural (White) and Black, also there are some colors are available on special order; there is also the Delrin AF (a PTFE filled Delrin) is a mid to dark brown color.

There are two basic grades of Acetal

You need to know some of the differences, Acetal versus Delrin. There are two main types of Acetal; one is a copolymer and the other a homopolymer. Ticona is one manufacture that makes a widely known copolymer called Celcon, BASF produces a high quality copolymer, H2320. Likewise DuPont makes Delrin, a popular brand name and the most commonly used Homopolymer. Standard mill shapes include: Acetal Sheet, round rods, flat sheets and some tube and profiles are also produced.
They may be close, but not the exactly

Yes, the copolymer and homopolymer acetal are very similar and they look the same, they do have some large differences in properties and this makes them unique in their own way. For example the copolymer will perform better than the homopolymer in these areas; thermal, impact, wear and chemical resistance. As you investigate the copolymer characteristics, you will discover that it has a lower water absorption rate. You may find this to be important if you plan on using with moist functions such as faucets, impellers, pump parts, valve and valves stems than the homopolymer acetal will. Now, when you review the homopolymer, which has a higher crystallinity, this will increase some properties and make it stronger, with improved mechanical strength and creep resistance, than its brother, the copolymer. Chemical resistance is one of the areas Acetal materials sometimes have a weakness, specifically oxidizing agents and strong acids. Other than these types of chemicals, Acetal is pretty much resistant to a wide range of solvents and commonly used chemicals.

Delrin Versus Acetal

One visual difference, and possibly a significant performance difference, between the copolymer and homopolymer is center line porosity. The homopolymer (Delrin) resin is known to be susceptible to having center line porosity, a section in the center of a rodt, it will be seen as a small circle found at the center. As for slab or sheet, it will appear as a white stripe down the center or middle (of the thickness) of the extruded or compression molded sheet material. This porosity is caused by the gasses trying to escape during the cooling processes. If a large rod is to have the middle or center machined out, then Delrin is an excellent choice. Copolymer Acetal does not have this ‘soft center’ or porosity.
Homopolymer Delrin and Copolymer Acetal are easy to machine

Both of these resins can be excellent choices for machining and mechanical type applications. Tight tolerances may be maintained during the cutting and machining process. The materials are considered to be self lubricating, and make very good dry slide wear strips. Both of these resins are FDA and 3A (Dairy) compliant.

You may wish to consider Acetal, either Delrin Homopolymer or Copolymer Acetal for your next engineering plastic applications. Contact us via Email for additional assistance, or call us at 866-832-9315

Topic: Delrin Versus Acetal in Sheet and Rod

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Acetal – Delrin Sheet vs. ABS Sheets and Rods

Acetal-Delrin® (Delrin® is a trade name for Dupont’s Acetal Homopolymer) and ABS (Acrylonitrile-Butadiene-Stryene) have some similar properties but are really very different materials. They similarities are: high impact strength, ease of machining with standard cutting tools and good mechanical properties. They are also both FDA compliant and are both good substitutes for brass. They also have great water absorption resistance and good electrical properties. Both materials are good for some of the same applications but certainly not all. Listed below are some of the major differences.Natural ABS Rod, Rods, Sheets and Sheet

ABS Sheet and Rod Information

 

  • ABS comes as Natural (straw) and Black color in Plate, Slab, Sheets and Rods, and thin sheet (.040″ – .250″) it is available as White or Black with a textured surface one side. It can be cut from 48″ X 96″ sheets into strip, panels or pieces.
  • ABS is formable. ABS is a great thermo-formable material while Acetal is not. Acetal is used more for machined parts such as gears and screws. ABS is great for molding and shaping parts from vacuum to heat forming. Excellent for model building and prototype projects.
  • ABS is easily bondable (similar to PVC). ABS can be bonded or welded to itself. Because Acetal is self lubricating, it is not possible for anything to stick to it unless etching is done – therefor it is not bondable.
  • ABS is a great material for painting and silk screening. While Acetal can not be painted or silk screened unless it has undergone Corona Treating (a flame surface treatment), but if treated will nice paint or screened surface.
  • ABS has better chemical resistance than Acetals or Delrin®. Both are attacked by acids like sulfuric, but ABS has a wider range of resistance to chemicals like aqueous acids, alkaline and alcohol. Acetal will degrade when exposed to such chemicals as chlorine and alkalines.
  • Specialty grades of ABS are available, including: Glass Filled, Static Dissapating, and Fire Retardant Grades (like Royalite – R59)Machined Black ABS Rod Part

ABS Typical Properties Table

General Property ASTM

TestTypical ValueR59 Typical ValueSpecific Gravity D7921.041.18 – 1.25Tensile Strength YieldD6386,5005,000Tensile ModulusD638320290,000Izod Impact – NotchedD2567.07.8Hardness – RockwellD785R105R93Deflection Temp @ 264psiD648192174Deflection Temp @ 66 psiD648208195Co. Thermal ExpansionD6965.3X10-54.6 -5.5X10-5

 

Acetal-Delrin® Sheet and Rod Information

  • Acetal is the better machining plastic, considered the best machining plastic material. Because of its durability and wear resistance, Acetal is an excellent choice for producing a wide variety of parts that require high wear resistance over a wide period of time. When machining to tight and specific tolerances, Acetal is ideal.
  • Acetal has low co-efficient of friction. Due to its self lubricating properties, it is a great material for sliding and wear applications. This material provides years of maintenance free bushings and bearings.Natural Acetal Machined Gears
  • Acetal – Delrin sheet is produced from .062″ – over 6″ thick and sheet sizes of up to 48″ X 120″ as standard. The standard color for Acetal and Delrin is Natural (a deep milky white) and Black. Some colors are available as Medical Grade, and can be obtained in limited sizes. These sheet are available cut to: slabs, blocks, plates, slabs and blocks.
  • Delrin – Acetal (Polyoxymethylene) can be both a homo and a co-polymer. The Dupont brand name is a homo-polymer which is a repeating chain of one atom while the generic Acetal is a co-polymer which is two atoms forming a repeating chain. ABS is only a co-polymer.

Acetal – Delrin Properties Table

General Property ASTM Test Typical Value Unfilled Delrin® Homo-Polymer Typical Value Unfilled Co-Polymer
Specific Gravity D792 1.42 1.40
Tensile Strength Yield D638 9,600 – 11,000 9,000 – 10,200
Tensile Modulus D638 450,000 400,000
Izod Impact – Notched D256 1.2 1.0
Hardness – Rockwell D785 M94 M90
Deflection Temp @ 264psi D648 257 220
Deflection Temp @ 66 psi D648 347 335
Water Absorption @ 24 hrs % 0.24 0.25
Co. Thermal Expansion D696 6.83X10-5 5.4X10-5

ABS and Acetal – Similar, but very different materials

Both of these materials possess excellent qualities and have a wide range of different uses. Acetal is great for machining, while ABS is great for forming and bonding. They both can be used for machined parts and are great choices for food contact and electrical applications. These two materials are both strong and durable plastics, but one might be better than the other for a specific job. When picking the right plastic, it is important to compare plastics and their specific properties to make sure the material won’t fail and that your job will be successful.

Contact us for additional information, call us at 866-832-9315 or contact us here. Consider Industrial Plastic Supply for all your plastic needs, we want to be your go-to plastic supplier.

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