Hand-Mix Foam Trials: How to Run a Cup Foam Test
A step-by-step guide to hand-mix cup foam tests: conditioning, mixing, reaction times, common mistakes and how the lab mixer affects trial results.
How Polyurethane Foam Is Made: Slabstock vs Molded
How flexible PU foam is made: raw materials, the reaction, slabstock vs molded foam, common faults and quality control.
ASTM D3574 vs ISO: Foam Test Method Cross-Reference
Every ASTM D3574 test mapped to its ISO counterpart, which pairs are equivalent, and how to report results so they compare.
IFD vs ILD: What the Difference Means for Foam Buyers
IFD and ILD are the same foam firmness test. How ASTM D3574 B1 measures it, what 25% and 65% values and support factor mean.
Foam Density vs Hardness vs Resilience: What Each Number Tells You
What foam density, hardness (IFD) and resilience each measure, which standards apply, and how to read the three together.
Foam Testing Guide: Properties, Standards and Equipment
Two blocks of flexible polyurethane foam can look identical on the warehouse floor and behave completely differently a year later. One ...
What Is Foam Resilience (Ball Rebound) Testing?
What separates a foam that pushes back "alive" when you sit on a mattress from one that feels dead is resilience. This property is meas...
Foam Density Test Standards
Density is the most commonly misunderstood concept in the foam industry. Many people assume "higher density = firmer foam"; but density...
How to Perform a Foam Fatigue Test?
When a mattress, a seat cushion, or a car seat is used for years, does it keep its original support, or does it collapse? The answer to...