What is acrylic plastic? Acrylic PMMA, polymethyl methacrylate is a widely used amorphous thermoplastic polymer. Acrylic is tough, durable, easy to shape and relatively inexpensive. It is especially attractive for its high, optical quality transparency and useful mechanical properties. Acrylic plastic also has excellent resistance to ultraviolet UV light and weathering. It does not yellow over time.
Because it is BPA free, it is also a useful BPA-free alternative to polycarbonate frequently used for making component parts for medical, biological and biopharmaceutical applications.
Acrylic PMMA chemical resistance In general, acrylics are unaffected by laboratory chemical solutions where water is the solvent. Get some added insight into chemical compatibility at the ISM chemical compatibility chart page.
Acrylics are generally not recommended for use with. Acrylic PMMA plastic and these chemical compatibility guidelines. Things to keep in mind when referring to this chemical compatibility guide Chemical resistance information is based on data provided by testing done under laboratory conditions.
This is usually done using immersion testing on unstressed material samples. Also, immersion test procedures are not generally standardized. Why lab testing is not enough In a lab, it is not possible to cover all the possible variables that might exist in actual operating conditions.
This is because so many factors can affect a materials chemical resistance. These include exposure time, chemical impurities, mixing of different chemicals, concentration, extreme temperatures or pressures, temperature and pressure cycling and mechanical stresses.
Stress Cracking Certain combinations of chemical exposure and mechanical stress can also cause environmental stress cracking. Environmental stress cracking is not purely a result of chemical attack.
General Chemical Resistance Chart
A combination of three factors cause stress cracking: tensile stress, a stress cracking chemical and the inherent susceptibility of a thermoplastic to stress cracking.By providing us with your email address you are granting us permission to send you occasional marketing emails.
ALWAYS test your equipment under the specific conditions of your application before permanent installation.
Ratings of chemical behavior listed in this chart apply at a hr exposure period. We have no knowledge of possible effects beyond this period. We do not warrant neither express nor implied that the information in this chart is accurate or complete or that any material is suitable for any purpose. All Rights Reserved. Explanation of Footnotes 1. CAUTION: Variations in chemical behavior during handling due to factors such as temperature, pressure, and concentrations can cause equipment to fail, even though it passed an initial test.
In general, polypropylene is chemically less resistant than polyethylene Polypropylene offers good resistance to non-oxidizing acids and bases, fats and most organic solvents At elevated temperature, polypropylene can be dissolved in nonpolar solvents such as xylene, tetralin and decalin.Chemical compatibility
Download Printable. Chemical Charts. Sign up to. Download Printable Chemical Charts.Chemical resistant plastics. Chemical compatibility, chemical resistance and corrosion resistance are among the greatest advantages of plastics in comparision to metals. By choosing the right polymer family, the user can put himself in the position of being able to withstand even the harshest environmental conditions without the need for additional protection such as surface treatment, painting or cathodic protection.
In our product portfolio you will find specific acid resistant plastic materials, polymers resistant to strongly alkaline media, including hot water and steam, as well as solvent resistant plastics. Users will also find they are able to choose a balanced chemical resistant plastic suitable for a variety of end uses. The following tables give an indication of pH limits and substance categories to be used as a general guide to plastic chemical resistance, and to indicate where different product families may be used, under room temperature conditions with no mechanical load.
The term chemical resistance is generally used to describe the resistance of a material to the effects of chemicals. In most cases, inadequate chemical resistance shows itself by swelling or softening of the material, which can result in loss of mechanical properties and overall serviceability. The molecules of the medium diffuse into the space between the polymer chains and push them apart. Since most diffusion processes are temperature dependent, the chemical resistance specifications should always be considered in light of the temperature specified by the test conditions.
Users should be especially cautious when using amorphous thermoplastic polymers in the presence of chemicals which can lead to stress crack formation and part failure.
Microcracks can form, which can eventually grow into large crack networks under the influence of mechanical stress. Neither water nor inorganic substances dissolved in water such as acids, alkalis and salts will attack thermoplastics to any major extent.
Exceptions to this are alkalis in certain concentrations and at certain temperatures in the presense of PVDF, which will initiate the formation of stress cracks, and oxidizing media, which can cause stress cracks in PP and PE.
Colour changes that might appear in contact with chemicals can indicate a change in a plastic's chemical resistance. The effect of organic media on thermoplastics is different from that of inorganic ones. Organic chemicals and the molecular chains of thermoplastics can interact with one another.
Chemical Resistance Guide
This means that in addition to real signs of dissolution for example in the case of methylene chloride and PVCvery often swelling may occur. Swelling enlargement of the distances between the molecular chains is a change in the volume and shape of a solid body under the influence of liquids, vapours or gases. Polymer chains also can become enveloped by some particular solvents.
In this context, it should be pointed out that swelling causes stresses due to changes in length however, most swelling of this type can be eliminated later by drying. In the case of mixtures of chemicals, it is generally not possible to reliably predict whether the thermoplastic will be subject to chemical attack, because in many cases unknown secondary effects occur.
As an example, if concentrated hydrochloric acid is mixed with nitric acid in a ratio ofaqua regia forms, one of the most aggressive media in existence.
The most important criteria for testing chemical compatibility are temperature, chemical concentration, exposure period, and mechanical load. This information is provided to the best of our current knowledge and is designed to provide data about our products and their applications.
It is thus not intended to provide any legally binding assurance or guarantee of the chemical resistance of our products or their suitability for a specific application. Any existing industrial property rights must be observed. If you wish to verify the resistance of our materials to common sanitary or sterilisation methods used in the food, medical or pharmaceutical sector, click here :.
If in doubt, where desired media, chemical concentrations, or temperatures are not listed, or when mixtures are involved, we hightly recommend testing on an individual basis to check material behaviour and possible unexpected interactions under realistic application conditions.Need more information about a material? Use our interactive plastic properties table. Solve application challenges, find answers to material questions, and get valuable technical advice.
Factors like temperature, concentration of the driving forces, duration and mechanical load are important criterions for the examinations of chemical resistance. They do not mean that the chemical resistance of products or their suitability for a particular purpose is guaranteed in a legally binding way.
We guarantee perfect quality within the scope of our general terms and conditions. For specific applications it is recommended to establish suitability first. The reader is cautioned, however, that Curbell Plastics, Inc. Home Research Solutions. Use our interactive plastic properties table Technical Assistance Solve application challenges, find answers to material questions, and get valuable technical advice.
Read an Article to Learn More. Plastic Materials in Chemical Environments Explore how to best select plastic materials for chemical environments. Polypropylene homopolymer.What type of plastic offers the best resistance to various chemicals? Chemical Resistance Reference Charts for Plastic Containers: We have several chemical compatibility reference charts to help you determine the appropriate resin for your specific chemical needs. By providing us with your email address you are granting us permission to send you occasional marketing emails.
It is your responsibility to test a container and chemical together ensure compatibility under your unique circumstances.
Home Chemical Charts Chemical Charts What type of plastic offers the best resistance to various chemicals?
Polyethylene HDPE and LDPE has a very good compatibility rating with most chemicals and is resistant to strong acids and bases, as well as gentle oxidants and reducing agents Polypropylene is almost as resistant as polyethylene, but with a few specific chemicals it offers superior resistance. It can also be autoclaved and is better for use in higher temperature situations.
PTFE is the most chemically resistant resin, although it is much more expensive and appropriate only for extreme acids and oxidizers that cannot be stored in more economical plastics Steel and Stainless Steel should be used with fuels and flammables that require grounding Chemical Resistance Reference Charts for Plastic Containers: We have several chemical compatibility reference charts to help you determine the appropriate resin for your specific chemical needs.
Sign up to.
Download Printable. Chemical Charts. Download Printable Chemical Charts. Some effect after 7 days to the reagent. The effect may be crazing, cracking, loss of strength or discoloration. Not recommended. Immediate damage may occur. Depending on the plastic, the effect may be severe crazing, cracking, loss of strength, discoloration deformation, dissolution or permeation loss.
Not recommended for continuous use. LDPE not recommended at any temperature.One of the most important resources for determining which plastic should be used in a chemical environment is a chemical resistance chart for plastics.
These charts show how compatible different plastics are with a variety of chemicals and other fluids that fall on all points of the pH scale, from milk to mineral oil to fruit juice. However, the chart only gives you a snapshot of how a plastic might perform — there are several other environmental factors that need to be understood and considered before you can make a truly informed decision.
There are three factors, or interactions, that just about all chemical compatibility charts for plastics can tell users about: chemical attack, environmental stress cracking and physical absorption.
Knowing what these factors mean in the relationship between plastics and chemicals can go a long way toward informing your choice of plastics for different applications.
When a plastic and a chemical are not compatible, the chemical essentially attacks the plastic in a reaction that causes the polymer structure to break down.
This occurs at a molecular level and causes the chains that bind the structure together to weaken, become more susceptible to impact and even fail. Part failure can be disastrous for any facility, so be sure to only choose plastics that are up for the job and monitor parts as instructed to ensure they get replaced or repaired when needed. Chemical attacks are sometimes considered ESC environmental stress cracking when related to vulnerabilities in the plastic's structure.
ESC occurs in conjunction with internal and external stresses on a plastic. Internal stresses are placed on a plastic part during fabrication and processing, while external stresses occur from the mechanical load on the part. So, when a chemical weakens the plastic's structure, the forces already at work on a plastic cause thin, spiderweb-like cracking that could seriously affect a part's performance.
This process is a bit different from a chemical attack since it doesn't affect the molecular structure of the polymers. However, it does seriously affect the physical structure of the plastic part.
When chemicals are absorbed into the plastic, it can make the part go soft or brittle, fluctuate in weight and even change in dimension. While chemical attack, environmental stress cracking and physical absorption are all serious and important factors covered by a chemical compatibility chart, plastics can be affected by a variety of other factors as well. Temperature plays a massive role in determining how a plastic will interact with a chemical.
You should always specify temperature requirements when choosing a plastic because it could influence the type of plastic or additional applications needed to craft a successful system. For example, polyolefins like HDPE and polypropylene function best at low to moderate operating temperatures.
However, when temperatures get too high, they tend to go soft and even begin to lose their form. If a holding cabinet, tank or piece of food processing equipment will be placed in an area with extremely high temperatures, HDPE and polypropylene would not be ideal choices. It's also important to know how long a part will be exposed to chemicals before choosing your plastic material — even chemical resistant plastics can begin to break down after long exposure. As such, it's important to maintain plastic parts by wiping away any spills and splatters that may occur.
If fluids and chemicals will be sitting inside of a plastic tank or another part for extended periods of time, you should always "over-engineer," or choose a plastic that can more than handle your specifications.
A chemical in its pure form is very different from one that's been watered down.
As such, it's crucial that you choose a plastic that can stand up to a chemical at whatever concentration specification you require. In some chemical compatibility charts, multiple entries will be shown detailing how well a polymer resists chemicals at different concentrations. If this is not the case, it would be best to consult with your parts supplier about what a specific plastic can handle.
However, as we've explained, certain plastics are better at resisting certain chemicals than others. In the chemical resistance guide for plastics below, you'll see whether a plastic sustains no chemical attack or absorption, moderate attack or severe attack by the various materials listed.
Moderate attack means that the plastic can handle exposure but will have a limited lifetime, while severe means the plastic will decompose quickly. On top of our chemical resistance guide for plastics, we have a treasure trove of other resources on all the chemically resistant plastics we offer and the qualities that make them great for an amazing variety of tasks and applications.
Polypropylene Chemical Compatibility Chart
Need Help? Call Chemical Resistance Chart for Plastics.These raw materials have outstanding resistance to both physical and chemical attack.
The following chart should be used as a guide for evaluating the suitability of our products with the chemical agent to be used. Special consideration must be given to the expected temperature, stress involved in the application, and length and type of exposure i. The information contained in this article is for general information purposes only. The information is provided by United States Plastic Corp. In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from loss of materials, time or profits arising out of, or in connection with, the use of this information.
Plasticizer — Certain types of chemicals are absorbed to varying degrees by polyethylene, causing swelling, weight gain, softening, and some loss of yield strength. These plasticizing materials cause no chemical degradation of the resin. Some of these chemical have a strong plasticizing effect e. The effect on the polyethylene may be gradual even for strong oxidizers, and short terms effects may not be measurable. However, if continuous, long-term exposure is intended, the chemical effects should be checked.
Search More Articles. Was this article useful to you? Information disclaimer: The information contained in this article is for general information purposes only. Carbon Dioxide all conc. Formic Acid all conc. Hypochlorous Acid conc. Nickel Chloride conc. Sulphuric Acid fuming Sulphurous Acid.