What’s Inside Your HVAC&R Line Products? Dry All Finds It Through ASHRAE 97 Norms

There’s a question that rarely comes up in system design conversations. Engineers debate refrigerant choices, contractors compare compressor specs, and procurement teams scrutinize pressure ratings. But almost nobody stops to ask the one thing that actually determines how a system holds up over years of real-world operation:

“How do the internal materials inside your line products behave — chemically, over time — as refrigerants and lubricants evolve around them?”

It sounds like a niche question. It isn’t. It’s arguably the most important question in the room.

The Refrigerant Shift Is Real and It’s Changing Everything Below the Surface

For a long time, the industry ran comfortably on high-GWP refrigerants like R-410A. They were non-flammable, well-understood, and reasonably forgiving. A little moisture variance, a minor chemical inconsistency; legacy refrigerants didn’t make you pay for those things immediately. That era is ending.

Driven by environmental regulations and sustainability targets, systems are now transitioning to lower-GWP alternatives viz. A2L refrigerants like R-32 and R-454B, and HFO blends that promise a smaller climate footprint without sacrificing performance. These are genuinely better choices for the planet.

But here’s the part that doesn’t make it onto the sustainability press release: these newer refrigerants interact with system components very differently from their predecessors. They carry higher flammability classifications. They react differently with synthetic lubricants. They’re more sensitive to moisture. They have a greater tendency to form acids under the wrong conditions.

In other words, what used to be a “normal” material response inside a Filter Drier, Oil Separator or Receiver is no longer normal. The refrigerant changed. The chemistry changed. And if the components didn’t change with it, you’ve quietly set yourself up for problems that won’t show up until months or years down the line.

The Hidden Story: What’s Really Happening Inside a Line Product

When you install a filter drier, an oil separator, a receiver or a valve, you’re not just inserting a component into a pipe. You’re introducing a chemical interface into a live system. From the moment refrigerant flows through it, every internal material i.e. the desiccant media, the metallic mesh, the elastomer seals, the welds begin a long, slow conversation with the chemicals around it. Most of the time, that conversation is silent. But it’s always happening.

The obvious checks like connection size, pressure rating, compatibility with the refrigerant type are necessary, but they’re not enough. They tell you whether a component will work at installation. They don’t tell you whether it will still be working well in year three or year five.

The deeper questions are the ones that actually predict long-term performance: Will the desiccant remain chemically stable, or will it slowly break down and release contaminants back into the circuit? Will the metallic mesh corrode under sustained contact with the new refrigerant blend? Will the elastomers swell, harden, or crack as they absorb synthetic lubricant over thousands of operating hours?

These aren’t hypothetical concerns. They show up as acid formation, moisture migration, contamination build-up and eventually compressor failures that feel like they came out of nowhere. They don’t come out of nowhere. They come out of material incompatibility that was silently building for a long time.

ASHRAE 97: The Standard That Asks the Right Questions

If material compatibility is the problem, ASHRAE Standard 97 is the methodology that takes it seriously.

Unlike specification checks that evaluate a component in isolation, ASHRAE 97 puts materials where they actually live — immersed in real refrigerant and lubricant environments, over extended periods, through genuine thermal cycles. It demands empirical data, not theoretical assumptions. It evaluates chemical stability, resistance to degradation, structural integrity under sustained exposure, and safe interaction with both mildly and more significantly flammable refrigerant classes.

“ASHRAE 97 answers the question the spec sheet never asks: can these materials survive real-world conditions — not just the day they’re installed, but years later?”

At Dry All, ASHRAE 97 isn’t a certification badge applied to packaging. It’s a design benchmark baked into how we engineer products from the inside out.

The Dry All Perspective: Engineering Reliability Before It’s Needed

We’ve spent a long time thinking about what reliability actually means in a post-R-410A world. And here’s what we’ve come to believe: it doesn’t start with performance data. It starts with material decisions that happen long before a product ever reaches a system.

Every Dry All line product—be it filter driers, oil separators, receivers, accumulators, or valves—is developed with the assumption that it will spend years inside a system running on evolving refrigerant chemistry. That assumption shapes everything: which desiccants we select, how we specify elastomers, what metallurgy we use for meshes and welds, how we test for long-term stability rather than just initial function.

• Filter DriersNot just moisture removal but the desiccants are selected to remain stable through extended operation with A2L and HFO refrigerants and modern synthetic lubricants. No swelling, no breakdown, no contamination feeding back into the circuit.
• Oil SeparatorsMetals and elastomers that maintain their chemical integrity over time, ensuring oil returns cleanly and consistently without the gradual degradation that quietly reduces system efficiency.
• Receivers and AccumulatorsWelds (brazings), filters and seals designed not to react undesirably with new refrigerant generations over thousands of cycles. Because a receiver that begins corroding from the inside in year two isn’t a component but a delayed warranty claim.
• Valves and Flow ControlsNo silent erosion, no elastomer swelling that gradually distorts flow characteristics, no pressure drift that makes a well-designed system start behaving like a poorly-designed one.

What Field Performance Actually Reveals

The truth about material compatibility shows up clearly when you look at systems that have been running for a few years. Systems built with components that weren’t rigorously tested for material compatibility tend to develop a recognisable pattern: accelerated acid formation, premature elastomer fatigue, corrosion at filtration media, and performance that slowly drifts from its original design point. The system doesn’t fail dramatically but it degrades quietly, incrementally, in ways that are expensive and frustrating to diagnose.

Systems built with Dry All products that are engineered with material compatibility and ASHRAE 97 at the core tend to tell a different story. Desiccants remain stable. Refrigerant circuits stay cleaner, longer. Elastomers hold their shape and sealing performance. The system performs in year four the way it did in year one.

“That’s not a marketing claim. That’s what ASHRAE 97-tested material selection actually delivers.”

In a Changing Industry, Components Must Do More Than Work

The industry is moving fast. Refrigerants are evolving, environmental targets are tightening, and safety classifications are placing new demands on everything from system design to component selection. In that context, the old standard “does it work?” isn’t enough anymore.

Components must persist through chemical change. They must resist the slow degradation that new refrigerant chemistries can accelerate. They must live inside a system for years without reacting against it. That is what material compatibility truly means.

And that is why ASHRAE 97 isn’t a footnote in a product data sheet—it’s the foundation of products designed to last. Because systems don’t fail where you expect them to. They fail where materials silently deteriorate in the components that nobody thought to look at closely enough, long after installation.

Ask the Question Others Don’t

The next time you’re specifying line products for a system—especially one running on A2L or HFO refrigerants—go one question deeper than the spec sheet.

Don’t just ask whether it fits and whether it's pressure rated. Ask how the internal materials will respond to the chemical environment they’re about to live in for the next five to ten years.

That question changes what you look for. And what you look for changes what you find be it in the field, in the field returns, and in the long-term track record of the systems you build.

Dry All Line Products follows Material Compatibility & Engineered from the Inside Out

At Dry All, we’ve been asking the hard material questions for a long time. Every product we make—be it every desiccant we select, every elastomer we specify, or every weld/braze we engineer—that’s the answer to those questions. Not validated by theory. Validated by ASHRAE 97, and proven in real-world systems running on the refrigerants that are shaping the industry’s future.

That’s reliability you can measure, not just claim.