A Guide to Chemical Resistance

Posted on: 20th Aug 2018

 

The chemical resistance of a material indicates its strength to protect against chemical attack or solvent reaction. It determines a materials resistivity to corrosive environments.

Components manufactured from chemically resistant materials are necessary in varied applications and environmental conditions across a vast and diverse range of industries serviced by PolyGlobal.

Materials with high chemical resistance have less chance of corrosion and are more able to maintain their integrity within a corrosive environment. This ensures prescribed mechanical properties can be fully realised.

In the same environment, materials with low chemical resistance are subject to swelling or softening and therefore the mechanical, chemical and thermal properties of the material can be compromised.

Selecting materials with high chemical resistance for applications in corrosive environments can reduce the need for replacement parts whilst improving effectiveness and productivity.

Material Classifications

Various definitions and explanations can be used to classify material resistance however the below are best offered as summations:

Resistant: Little or no change in weight or mechanical properties and therefore generally usable for prescribed application

Partially resistant: Usually short term exposure has little impact on the polymer, but over a period of time there is a noticeable deterioration in mechanical properties or weight of the part (Material not recommended for critical applications)

Non-resistant: Even short term exposure shows a noticeable deterioration in mechanical properties or weight of the part (Material not recommended)

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PolyGlobal Chemical Resistance Guide

Material Information

Where high chemical resistance is a crucial consideration, metal replacement material options can be an ideal choice. Metal replacement materials benefit from excellent corrosion resistance and enhanced chemical performance as well as excellent mechanical and thermal properties.

Due to the variety and flexibility that polymer based materials offer, bespoke modifications can be made to ensure the specific criteria of each operating environment and consideration can be satisfied with the most suitable material option.

Key Material Options

As part of their core material range, PolyGlobal offer a selection of DuPont™ Hytrel® grades. Hytrel® combines the flexibility of rubber with the strength and processability of thermoplastics.

Hytrel® TPC-ET thermoplastic elastomers are versatile copolyesters which offer excellent resistance to many industrial chemicals, oils and solvents along with resilience, strength and durability, flexibility at low temperatures and good retention of properties at elevated temperatures.

Material Testing

As part of their ongoing development, PolyGlobal are set to launch an exciting partnership with Bradford University’s Polymer Interdisciplinary Research Centre. Their facilities are the largest of their kind in the world and include 40 advanced manufacturing lines for melt phase, solid phase and reactive processing, extensive physical and chemical characterisation.

The implementation of this partnership will enable PolyGlobal to provide their customers with enhanced product data, which is crucial in ensuring the perfect product is selected for them. It will also allow PolyGlobal to offer material testing on existing parts

For more information on material testing or material options, please contact PolyGlobal via marketing@polyglobal.co.uk

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