Capto s chemical compatability how to#

This information is to be used ONLY as a guide to selecting components for testing for appropriate chemical compatibility.

The information in this chart has been supplied by reputable sources believed to be reliable and accurate. Chemicals that do not normally affect the properties of an unstressed thermoplastic may cause stress cracking under thermal or mechanical stress such as constant internal pressure or frequent thermal or mechanical stress cycles. Relatively small concentrations of stress cracking agent may be sufficient to cause cracking. Stress cracking chemicals include detergents, surfactants, lubricants, oils, ultra-pure water and plating additives such as brighteners and wetting agents. A combination of three factors cause stress cracking: tensile stress, a stress cracking chemical and the inherent susceptibility of a thermoplastic to stress cracking. This failure is not purely a result of chemical attack. The sorts of interactions that can take place between a chemical and a plastic are of three basic types: chemical attack on the plastic, stress cracking and physical change of the plastic such as softening and swelling.Įnvironmental stress cracking is the failure of a thermoplastic component when exposed to certain types of chemicals. Mixing or dilution of certain chemicals as well as combinations of mixing and dilution of chemicals may cause undesirable chemical reactions including the production of heat which in turn can cause component failures.Ĭhemicals can affect the strength, flexibility, surface appearance, color, dimensions or weight of plastic components and component parts. All information provided in this chart is based on an assumed ambient temperature of about 70 ☏ (21 ☌) unless otherwise noted. It is important to note all temperature references within this compatibility chart. There are many reagents which can be safely handled only below a certain temperature. Resistance to chemicals is a function both of temperature and concentration. This listing does not provide information on chemical combinations. Chemical compatibility is often compromised when handling more than one chemical or when handling compounds containing impurities. Note the compatibility rating of the combination of chemical and component material and choose the best materials for sampling, evaluation and testing.Ĭhemical compatibility of component parts is extremely important because of possible rapid degradation and failure if the materials are not compatible with the environment where they are used or the chemical they are in contact with. The chemicals are listed alphabetically.Ĭompare the chemical with the various component material options listed along the top row of the chart.

Capto s chemical compatability how to#

How to use this chart to determine compatibilityįind the name of the chemical along the left column of the chart. This combination has no recommendation and may require extensive testing and evaluation for its safe use. N/A Unknown - There is little or no technical information available for this combination of component material and chemical at this temperature and concentration.Severe effects make this combination unsuitable for ANY use.

D Poor - The component material has no resistance to chemical attack by the specified chemical at the specified concentration and temperature and immediate damage may occur.

The life expectancy of the component will be shortened and it is recommended that a different component material be used in these cases.

C Fair - The component material is partially attacked or attacked by absorption of the specified chemical at the specified concentration and temperature levels and swelling may occur.

B Good - There is some slight chemical attack on the component material that could create slight corrosion or discoloration but otherwise has minor effect on mechanical properties.

A Excellent - The component material is completely or almost completely inert when used with the specified chemical with negligible effect on mechanical properties.

It can help with the selection of flow control components and tubing samples for evaluation and testing.Īn Explanation of the Chemical Compatibility Chart Ratings Use our Chemical Compatibility Chart as guide for evaluating the resistance of polymer and metal materials to a wide range of chemicals found in industrial, commercial, laboratory and medical applications. Use this chart to help guide your component selection. This Chemical Compatibility Chart is a shorthand tool for describing the suitability of miniature fluidic and pneumatic component materials for use in contact with various chemicals.