💡 In This Article Why low-temperature epoxy curing is fundamentally more than a temperature-control problem The trade-offs between lower cure temperature and key material properties Why developing a low-temperature-curing system can require reformulating the entire epoxy system—not simply changing the curing agent One request comes up surprisingly often when developing an adhesive: "Can we lower … Continue reading Why Is Developing a Low-Temperature-Curing Epoxy So Difficult? ① — Why Lowering the Cure Temperature Alone Is Not Enough
Epoxy and Time ③: How Is the Shelf Life of a One-Component Epoxy Determined?
💡 In This Article • How the shelf life of a one-component epoxy adhesive is determined• How Q10 and the Arrhenius equation are used in accelerated aging studies• Why shelf-life validation takes so much time—and what that time means for quality assurance In the previous article, Epoxy and Time ②: Why Are One-Component Epoxy Adhesives … Continue reading Epoxy and Time ③: How Is the Shelf Life of a One-Component Epoxy Determined?
Epoxy and Time ②: Why Are One-Component Epoxy Adhesives Stored in a Refrigerator (or Freezer)?
💡 In This Article • Why a one-component epoxy adhesive does not cure during storage• How reaction rates change as storage temperature decreases• Why a cold epoxy adhesive should not be opened immediately• Why repeated refrigeration or freezing can affect material consistency In the previous article, Epoxy and Time ①: Why Does Epoxy Keep Curing … Continue reading Epoxy and Time ②: Why Are One-Component Epoxy Adhesives Stored in a Refrigerator (or Freezer)?
Epoxy and Time ①: Why Does Epoxy Keep Curing Even After It Seems Fully Cured?
💡 In This Article Why an epoxy that looks fully cured may still contain unreacted functional groups Gelation and vitrification during epoxy curing Why post-curing is often necessary to achieve the final properties In the previous article, Why Does a Small Change in Epoxy Mix Ratio Cause Such a Big Change in Performance?, we looked … Continue reading Epoxy and Time ①: Why Does Epoxy Keep Curing Even After It Seems Fully Cured?
Why Does the Same Adhesive Produce Different Results for Different Customers?
💡 In This Article Why the same adhesive can produce different results under different process conditions Why securing a sufficient Flow Window is critical before curing begins How temperature, pressure, and timing mismatches can lead to reliability problems Analytical approaches for investigating process-related adhesive failures In the previous article, Why Does a Small Change in … Continue reading Why Does the Same Adhesive Produce Different Results for Different Customers?
Why Does a Small Change in Epoxy Mix Ratio Cause Such a Big Change in Performance?
💡 In This Article Why the balance of reactive functional groups between epoxy resin and curing agent matters How mix ratio influences molecular network formation and crosslink density How EEW and AHEW are used to calculate the theoretical stoichiometric mix ratio In the previous article, Selecting Epoxy Resins and Curing Agents, we looked at how … Continue reading Why Does a Small Change in Epoxy Mix Ratio Cause Such a Big Change in Performance?
Selecting Epoxy Resins and Curing Agents — The Starting Point of Formulation Design
💡 In This Article Major types of epoxy resins and their structural characteristics Types of hardeners and their curing mechanisms Key considerations when selecting an epoxy resin and hardener Matching resin–hardener combinations to application requirements In previous articles, we looked at how epoxy adhesives bond to substrates and how curing reactions build an epoxy adhesive's … Continue reading Selecting Epoxy Resins and Curing Agents — The Starting Point of Formulation Design
Reading Rheometer Graphs ③ — Why Do Rheometer and DMA Results Look So Similar?
💡 In This Article What storage modulus (G′) and loss modulus (G″) mean in rheology How Rheometer and DMA measurements differ—and why their results can look surprisingly similar How a Rheometer can be used to evaluate the glass-transition behavior of a cured epoxy adhesive In the previous article "Reading Rheometer Graphs ② — Why Does … Continue reading Reading Rheometer Graphs ③ — Why Do Rheometer and DMA Results Look So Similar?
Reading Rheometer Graphs ② — Why Does the Gel Point Matter?
💡 In This Article What the gel point really means in a curing epoxy system How to interpret the G' / G'' crossover and when it can be used as a practical gel-point criterion Why the shape and slope of the curing curves can matter more than the gel time itself How gelation changes flow … Continue reading Reading Rheometer Graphs ② — Why Does the Gel Point Matter?
Reading Rheometer Graphs ① — Why Measure Viscosity Before and During Cure?
💡 In This Article Why a single viscosity value is not enough to describe an adhesive How shear rate connects rheometer data to real processing conditions How 3ITT can quantify thixotropic recovery What changes in rheological behavior matter when coating line speed increases An Adhesive Is Not a Solid Yet If you've been following this … Continue reading Reading Rheometer Graphs ① — Why Measure Viscosity Before and During Cure?