Painting & Coating Industry (PCI) logo Powder coating summit logo
  • Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • PRODUCTS
  • MATERIALS
  • TECHNOLOGIES
  • RESOURCES
  • EVENTS
  • DIRECTORIES
  • EMAGAZINE
  • CONTACT
  • SIGN UP!
cart
facebook twitter linkedin youtube
  • NEWS
  • Latest News
  • Market Trends & Reports
  • Price Alerts
  • Subscribe to eNewsletters
  • Global Top 10/ PCI 25
  • Weekly Featured Article
  • COATLE Word Game
  • PRODUCTS
  • Product News
  • Must See Products and Services
  • MATERIALS
  • Additives
  • Resins/Polymers
  • Pigments
  • Equipment
  • Distributors
  • TECHNOLOGIES
  • Adhesives
  • Architectural Coatings
  • FINISHING
  • Industrial Coatings
  • Nanotechnology
  • Powder Coatings
  • Solventborne
  • Special Purpose Coatings
  • Sustainability
  • UV Coatings
  • Waterborne
  • FINISHING
  • Finishing News
  • Finishing Technologies
  • Finishing Equipment
  • Finishing Today
  • RESOURCES
  • Columns
  • Blogs
  • Coatings Supplier Handbook
  • Podcasts and Videos
  • PCI Store
  • Classifieds
  • eBooks
  • Sponsor Insights
  • White Papers
  • COATLE Word Game
  • Columns
  • Ask Joe Powder
  • Did you know?
  • Distribution Dive
  • Focus on Canada
  • Formulating With Mike
  • Innovation Insights
  • Moody's Coatings Conundrums
  • Powder Coating Perspectives
  • Target the Market
  • TiO2 Insider
  • Blogs
  • Editor's Viewpoint
  • Industry Insights
  • Podcasts and Videos
  • COAT-IT! Podcast
  • Videos/PCI TV
  • EVENTS
  • Coatings Trends & Technologies Summit
  • Paint and Coatings Academy
  • Webinars
  • Calendar of Events
  • Lifetime Achievement Award
  • DIRECTORIES
  • Buyer's Guide
  • Equipment Directory
  • Materials Directory
  • EMAGAZINE
  • Current Issue
  • eMagazine Archive
  • China Issue Archive
  • Editorial Advisory Board
  • CONTACT
  • Contact Us
  • Advertise
  • Subscribe to eMagazine
  • Subscribe to eNewsletters
Painting & Coating Industry (PCI) logo Powder coating summit logo
search
cart
facebook twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
Painting & Coating Industry (PCI) logo Powder coating summit logo
  • NEWS
    • Latest News
    • Market Trends & Reports
    • Price Alerts
    • Subscribe to eNewsletters
    • Global Top 10/ PCI 25
    • Weekly Featured Article
    • COATLE Word Game
  • PRODUCTS
    • Product News
    • Must See Products and Services
  • MATERIALS
    • Additives
    • Resins/Polymers
    • Pigments
    • Equipment
    • Distributors
  • TECHNOLOGIES
    • Adhesives
    • Architectural Coatings
    • FINISHING
      • Finishing News
      • Finishing Technologies
      • Finishing Equipment
      • Finishing Today
    • Industrial Coatings
    • Nanotechnology
    • Powder Coatings
    • Solventborne
    • Special Purpose Coatings
    • Sustainability
    • UV Coatings
    • Waterborne
  • RESOURCES
    • Columns
      • Ask Joe Powder
      • Did you know?
      • Distribution Dive
      • Focus on Canada
      • Formulating With Mike
      • Innovation Insights
      • Moody's Coatings Conundrums
      • Powder Coating Perspectives
      • Target the Market
      • TiO2 Insider
    • Blogs
      • Editor's Viewpoint
      • Industry Insights
    • Coatings Supplier Handbook
    • Podcasts and Videos
      • COAT-IT! Podcast
      • Videos/PCI TV
    • PCI Store
    • Classifieds
    • eBooks
    • Sponsor Insights
    • White Papers
    • COATLE Word Game
  • EVENTS
    • Coatings Trends & Technologies Summit
    • Paint and Coatings Academy
    • Webinars
    • Calendar of Events
    • Lifetime Achievement Award
  • DIRECTORIES
    • Buyer's Guide
    • Equipment Directory
    • Materials Directory
  • EMAGAZINE
    • Current Issue
    • eMagazine Archive
    • China Issue Archive
    • Editorial Advisory Board
  • CONTACT
    • Contact Us
    • Advertise
    • Subscribe to eMagazine
    • Subscribe to eNewsletters
  • SIGN UP!
Ask Joe Powder

Can Powder Coatings be Used Past the Expiration Date?

ask joe powder pci
August 26, 2019

Hi Joe:

I'm selling powder coating in South America. So now I have many questions in regards to powder coatings. But the most important is this: Can powder coatings be used past the expiration date given by the supplier?

 

Thanks
Claudia Helsum

Medellin, Colombia

 

 

Hello Claudia,
Thanks for the question. I have traveled and worked in Colombia and have very fond memories of my time spent there. I will be very happy to answer your question.

The stability of a powder coating is influenced by many factors. First I must differentiate two distinct types of stability. Physical stability involves the requirement for the individual particles to resist clumping or sticking together. Chemical stability refers to a powder coating's resistance to premature polymerization during storage and handling.

Physical stability is influenced by the melt point or more specifically the Tg (glass transition temperature) of the powder coating and the storage conditions. A powder coating with a low melt point will sinter and clump more readily than one with a higher melt point. Accordingly powders stored in high-temperature environments will clump more readily than those stored in cooler areas. Additionally, powders exposed to high-humidity environments tend to absorb moisture, which will also cause clumping. (Please note that most powders are supplied in moisture impervious containers and the exposure to moisture occurs after the package has been opened.) Clumping obviously makes a powder difficult to fluidize, transport and spray in an application system.

On the other hand, chemical instability causes a powder coating to chemically advance or polymerize during storage. Fast-reacting and low-temperature-curing powders can start to polymerize in high-temperature storage conditions. This premature chemical advancement reduces the melt flow of a powder coating, causing a more textured finish.

Both physical and chemical instability can be present in a powder coating. Typically fast-cure (or low-temperature-cure) powders also have low melt points to help facilitate better melt flow at low cure temperatures. Consequently these types of powders are most susceptible to clumping and chemical advancement, and should be stored and applied in a climate-controlled environment. I recommend less than 27 ⁰C and 50 to 70% relative humidity.

Now to answer your question (are you asleep yet?). Standard curing powder coatings (175 -200 ⁰C) that have been stored in a reasonable environment can remain usable long past their "due date". Low-cure powders and those that have been stored in environments exceeding 27 ⁰C for long periods of time can suffer from clumping and chemical advancement. I would inspect (for clumps, etc.) then spray and bake a sample of any powder that is past its due date and make the determination yourself. If the finish is still within your requirement for smoothness and appearance (no blistering, dirt, etc) then I would continue to use it.

Claudia, I hope that this helps you. Someday I hope to return to Colombia to enjoy the beautiful weather, excellent food and wonderful people.

Peace,

Joe

Have a question for Joe Powder? Email kevinbiller@yahoo.com. And be sure to listen to the Ask Joe Powder “Powdcast” for all the latest news, insights and technology in the powder coatings industry. Click here to listen!

KEYWORDS: curing of powder coating Powder coatings powder coatings suppliers

Share This Story

You must login or register in order to post a comment.

Report Abusive Comment

Blog Topics

Editor's Viewpoint

Journey to Sustainability

Industry Insights

Recent Comments

clearly and in detail

Broken Planet Stargazing Hoodie

Can we apply form the out of USA...

Education for Kids

The team at window film brooklyn is...

Manage My Account
  • eMagazine
  • eNewsletter
  • Online Registration
  • Subscription Customer Service

The Coatings Minute: Why Industry News Matters More Than Ever

The Coatings Minute: Why Industry News Matters More Than Ever

The Coatings Minute: Print Returns with PCI’s New Showcase Issue

The Coatings Minute: Print Returns with PCI’s New Showcase Issue

The Coatings Minute: Your Inside Look at PCInnovations

The Coatings Minute: Your Inside Look at PCInnovations

CTT Registration Now Open

CTT Registration Now Open

More Videos

Sponsored Content

Sponsored Content is a special paid section where industry companies provide high quality, objective, non-commercial content around topics of interest to the PCI audience. All Sponsored Content is supplied by the advertising company and any opinions expressed in this article are those of the author and not necessarily reflect the views of PCI or its parent company, BNP Media. Interested in participating in our Sponsored Content section? Contact your local rep!

close
  • Modern arapartment complex painted in bright colors.
    Sponsored byEPS - Engineered Polymer Solutions

    Architectural Polymers Leading the Way in Coatings Innovation

  • paint sprayer in a workshop
    Sponsored byallnex

    Enabling Performance and Compliance: allnex Introduces a New Line of VOC Exempt Solvent-Borne Resins

Popular Stories

No. 3 AkzoNobel

AkzoNobel to Close Two Manufacturing Sites

BASF SE Logo

BASF Reportedly Eyes Exit from Coatings

Modern arapartment complex painted in bright colors.

Architectural Polymers Leading the Way in Coatings Innovation



PCI Buyers Guide

Submit a Request for Proposal (RFP) to suppliers of your choice with details on what you need with a click of a button

Start your RFP

Browse our Buyers Guide for manufacturers and distributors of all types of coatings products and much more!

Find Suppliers

Events

September 3, 2025

Coatings Trends & Technologies Summit

The Coatings Trends & Technologies (CTT) Summit is an annual conference for both liquid and powder coatings formulators and manufacturers to discuss innovations in coatings technology. This event combines high-quality technical presentations, a resource-rich exhibit hall, and dedicated networking opportunities to connect scientific minds, foster innovation, and cultivate game-changing new ideas!

January 1, 2030

Webinar Sponsorship Information

For webinar sponsorship information, visit www.bnpevents.com/webinars or email webinars@bnpmedia.com.

View All Submit An Event

Poll

Longest-running laboratory experiment

What is the longest-running laboratory experiment?
View Results Poll Archive

Products

CTT Summit Short Courses (Live 9/3/25)

Coatings Trends & Technologies Summit is expanding its offerings with four short courses. These short courses will offer an extensive day of interactive learning.

See More Products
pci  webinar april 2025

PCI CASE EBOOK
×

Keep the info flowing with our eNewsletters!

Get the latest industry updates tailored your way.

JOIN TODAY!
  • RESOURCES
    • Advertise
    • Contact Us
    • Directories
    • Store
    • Want More
  • SIGN UP TODAY
    • Create Account
    • eMagazine
    • eNewsletters
    • Customer Service
    • Manage Preferences
  • SERVICES
    • Marketing Services
    • Reprints
    • Market Research
    • List Rental
    • Survey & Sample
  • STAY CONNECTED
    • LinkedIn
    • Facebook
    • Youtube
    • X (Twitter)
  • PRIVACY
    • PRIVACY POLICY
    • TERMS & CONDITIONS
    • DO NOT SELL MY PERSONAL INFORMATION
    • PRIVACY REQUEST
    • ACCESSIBILITY

Copyright ©2025. All Rights Reserved BNP Media.

Design, CMS, Hosting & Web Development :: ePublishing

Painting & Coating Industry (PCI) logo Powder coating summit logo
search
cart
facebook twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
Painting & Coating Industry (PCI) logo Powder coating summit logo
  • NEWS
    • Latest News
    • Market Trends & Reports
    • Price Alerts
    • Subscribe to eNewsletters
    • Global Top 10/ PCI 25
    • Weekly Featured Article
    • COATLE Word Game
  • PRODUCTS
    • Product News
    • Must See Products and Services
  • MATERIALS
    • Additives
    • Resins/Polymers
    • Pigments
    • Equipment
    • Distributors
  • TECHNOLOGIES
    • Adhesives
    • Architectural Coatings
    • FINISHING
      • Finishing News
      • Finishing Technologies
      • Finishing Equipment
      • Finishing Today
    • Industrial Coatings
    • Nanotechnology
    • Powder Coatings
    • Solventborne
    • Special Purpose Coatings
    • Sustainability
    • UV Coatings
    • Waterborne
  • RESOURCES
    • Columns
      • Ask Joe Powder
      • Did you know?
      • Distribution Dive
      • Focus on Canada
      • Formulating With Mike
      • Innovation Insights
      • Moody's Coatings Conundrums
      • Powder Coating Perspectives
      • Target the Market
      • TiO2 Insider
    • Blogs
      • Editor's Viewpoint
      • Industry Insights
    • Coatings Supplier Handbook
    • Podcasts and Videos
      • COAT-IT! Podcast
      • Videos/PCI TV
    • PCI Store
    • Classifieds
    • eBooks
    • Sponsor Insights
    • White Papers
    • COATLE Word Game
  • EVENTS
    • Coatings Trends & Technologies Summit
    • Paint and Coatings Academy
    • Webinars
    • Calendar of Events
    • Lifetime Achievement Award
  • DIRECTORIES
    • Buyer's Guide
    • Equipment Directory
    • Materials Directory
  • EMAGAZINE
    • Current Issue
    • eMagazine Archive
    • China Issue Archive
    • Editorial Advisory Board
  • CONTACT
    • Contact Us
    • Advertise
    • Subscribe to eMagazine
    • Subscribe to eNewsletters
  • SIGN UP!