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August 9, 2025 22 mins

In this episode of Adhesion Matters, we shine a light on one of aviation’s unsung heroes: adhesives. These advanced chemical formulations are increasingly replacing rivets and bolts in aircraft and spacecraft—but only when handled with meticulous quality control.

We explore why AS 9120 / EN 9120—a specialized quality management standard tailored for aerospace distributors—is critical to maintaining the integrity, traceability, and reliability of adhesives throughout the supply chain. From temperature- and humidity-controlled storage to rigorous batch tracking and documentation, this certification serves as more than compliance—it’s a strategic safeguard against costly failures and counterfeit risks.

We also discuss the high-stakes consequences of lapses in this chain, and how certification not only protects safety but also boosts operational efficiency, global market access, and business reputation. Tune in to discover how adhesive distributors serve as technical gatekeepers in aerospace's hidden yet vital quality ecosystem.

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Episode Transcript

Available transcripts are automatically generated. Complete accuracy is not guaranteed.
Elena Bondwell (00:00):
Welcome to the Deep Dive, where we cut through
the noise and get straight tothe knowledge that, well, truly
matters.
Today, we're pulling back thecurtain on some of the unsung
heroes of aerospace.
We're talking about theincredibly vital, often
overlooked role of adhesives inaircraft and spacecraft.
And it's more than just glue.
These are sophisticatedchemical formulations and the

(00:21):
quality standards around them,they're remarkably strict.
So our mission for this DeepDive is pretty clear.
We're gonna explore why thesematerials are so critical to,
well, everything that flies.
We'll look at the uniquechallenges they pose and how a
specialized internationalcertification EN-9120-0AS-9120
acts as a kind of globalpassport for quality in their

(00:42):
distribution.

Lucas Adheron (00:43):
And it's absolutely crucial to grasp that
in aerospace safety andreliability, they aren't just
buzzwords.
They are paramount.
When we talk about aircraft andspacecraft, even a microscopic
failure in a component like anadhesive, something seemingly
small, it can have catastrophicconsequences.
The stakes really couldn't behigher.

Elena Bondwell (01:00):
You know, when most of us picture an aircraft,
we instinctively think of rivetsand bolts, right?
That classic image.
But our source material revealsthis huge and critical shift
towards advanced adhesivebonding in modern aerospace
design.
What's fundamentally drivingthat trend?

Lucas Adheron (01:17):
Well, it's really multifaceted.
It's driven mostly byperformance and efficiency
gains.
One of the biggest advantagesof using adhesive bonding over,
say, traditional mechanicalfasteners is significant weight
reduction.
Adhesives are just incrediblyinherently much lighter than
rivets and bolts.

Elena Bondwell (01:32):
And that adds up, I imagine.

Lucas Adheron (01:33):
Oh, absolutely.
It's not just a marginal gain.
Think about the scale millionsof fasters on just one aircraft.
If you replace even a fractionof those with lightweight
adhesives cumulatively, that canadd up to maybe an extra row of
passengers or thousands ofpounds of cargo capacity, and
that fundamentally changes theeconomics of a flight.
Better fuel efficiency,increased payload, even better

(01:56):
maneuverability for the vehicle,and beyond just the weight,
adhesives offer, well, vastlyimproved stress distribution.
Instead of concentrating stressat specific points like
fasteners do, adhesives spreadthe load evenly across the
entire body.
haunted area.

Elena Bondwell (02:11):
Oh, okay.
So less strain overall.

Lucas Adheron (02:13):
Exactly.
It minimizes fatigue andenhances durability, so
structures last longer.
Plus, adhesives act as a reallyeffective barrier against
galvanic corrosion.

Elena Bondwell (02:21):
Galvanic corrosion.
That's when different metalstouch.

Lucas Adheron (02:24):
Precisely.
It's basically an electricalprocess where two dissimilar
metals in contact, especiallywith moisture, can corrode
really rapidly.
They sort of ee away at thejoint.
Adhesives prevent that directcontact.
You also get these smooth,continuous surfaces, which are
fantastic for aerodynamics andlooks, reduces drag.
And finally, there's designflexibility and maybe even cost

(02:45):
reduction because you simplifyassembly less drilling holes.

Elena Bondwell (02:49):
Okay, so we've established why adhesives are so
critical for aircraft.
But what really fascinated medigging into the sources was
that it's way more complex thanjust one type of super glue.
Our sources reveal this reallydiverse world of adhesive
chemistries.
Each one seems to have a veryspecific job.
Can you maybe walk us throughsome of those?

Lucas Adheron (03:09):
Definitely.
Yeah, the Aerospace industryuses a really wide array of
adhesives, each with uniqueproperties for specific tasks.
Take epoxies, for instance.
They're very widely usedstructural adhesives.
They offer high strength, greatchemical resistance and thermal
stability.
You find them in structuralbonding, potting, repairs.

Elena Bondwell (03:25):
But not just any epoxy, right?
There are special requirements.

Lucas Adheron (03:28):
Exactly.
That's the crucial part.
Aerospace grade epoxies have tomeet incredibly stringent
criteria.
Like in a spacecraft, you can'thave chemicals off gassing and
messing up sensitive equipment.
That's where NASA a lowoutgassing specifications come
in.
And for passenger safety,imagine a fire scenario.
The adhesive can't just, youknow, not burn easily.
That's UL94V0 flame retardancy.

(03:50):
It also mustn't produce tons ofsmoke or toxic fumes.
That's where Boeing's BSS7238for low smoke and BSS7239 for
toxicity come into play.
Each standard is a specificlife or death hurdle.

Elena Bondwell (04:03):
Wow.
Okay, so that's epoxies.
What else?

Lucas Adheron (04:06):
Then you have things like acrylics.
Their value for excellentadhesion and impact resistance
on Think attaching harnessclips, bonding magnets, that
sort of thing.
Polyurethanes give youflexibility, impact resistance,
and good adhesion.
They're good for applicationsneeding movement or vibration
damping.
And adhesive films and tapes,often these are B-stage epoxies.

Elena Bondwell (04:24):
B-stage, what's that mean?

Lucas Adheron (04:25):
It means they're partially cured.
So they're solid at roomtemperature.
but they become flowable andcure fully when you apply heat.
They come pre-applied, whichallows for really precise bond
lines, toughness, flexibility,ideal for large area bonding,
especially with the composites.
And it doesn't stop there.
You've got anaerobics, mainlyfor thread locking, Retaining

(04:46):
sealing critical spots likeengine compartments keeps
fasteners from vibrating loose.
And fluorosilicones.
These are designed specificallyfor resistance to fuels, oils,
solvents across really widetemperature ranges.
Often used as sealants.

Elena Bondwell (04:58):
It's so clear these aren't just commodities,
are they?
They're incredibly specializedproducts, each with unique
requirements.
So what does this level ofspecialization mean for, say, a
distributor handling thesematerials?

Lucas Adheron (05:11):
Precisely.
It means a standard ISO 9001quality management system.
Wow.
You know, a good foundation.
It's fundamentally insufficientfor aerospace.
The demands are just way toohigh.
You're dealing with extremeoperating conditions, huge
temperature swings, highaltitudes, intense vibrations.
And aircraft operate fordecades, right?
Exceptionally long product lifecycles.

(05:31):
And of course, the directimpact on human safety means
there's just zero room forerror.
So to meet this need, the ASIN9100 series of standards was
developed.
It's universally adopted now.
It's the global framework forquality management in aviation,
space, and defense.
These standards build on ISO9001, but add hundreds of
aerospace-specific requirements,things like product safety,

(05:52):
risk management, configurationmanagement, and crucially,
preventing counterfeit parts.
It's a whole system approach.

Elena Bondwell (05:58):
That makes perfect sense.
But you mentioned a wholefamily of these standards.
So what makes EN 9120, AS 9120so uniquely important,
especially for a company likeBodo Möller Chemie.
Our sources confirm they holdthe certification across
multiple sites, U.S.,Switzerland, Germany, Italy,
India.
Why that specific standard?

Lucas Adheron (06:16):
Ah, that's where the specialization really drills
down.
EN9120AS90120 is specificallydesigned for distributors and
stockists.
We sometimes call thempass-through distributors.
They procure and resellaerospace products.
Its unique importance is itssharp focus on the requirements
specific to stocking anddistributing these materials

(06:36):
while actually waiving thetypical production requirements
that just aren't relevant towhat a distributor does.

Elena Bondwell (06:41):
So it's tailored just for their part of the
chain.

Lucas Adheron (06:44):
Exactly.
And it's a very strict line.
If an organization does evensmall manufacturing or
maintenance tasks like assemblyor finishing their out, they
can't get EN-9120.
They need ASIN-9100 orASIN-9010 instead.
But activities that are commonto distribution, like, say,
separating batches, cuttingmaterials to size, preservation,
those are permitted underEN-9120.

(07:05):
but only as long as productintegrity and traceability are
fully maintained.
It really addresses the uniquerisks in distribution.

Elena Bondwell (07:11):
It's fascinating, isn't it, how the
aerospace industry tailorsquality management like that.
It's almost like a bespoke suitfor each specific role in the
supply chain.
So a distributor isn't just awarehouse.
They're a really critical nodein this highly specialized
network.

Lucas Adheron (07:27):
Absolutely.
And that tailored approachbecomes even more critical when
we're talking about adhesives.
EN920 requirements really takeon heightened importance for
these materials because theyare, well, sensitive chemical
formulations.
They're not like inert metalparts.
Our sources describe adhesivesalmost as living materials that
demand constant environmentalcontrol and life cycle tracking.

Elena Bondwell (07:49):
Okay, so let's unpack that with some specifics.
Traceability.
How does that actually work forsomething as complex and
sensitive as, say, a batch ofaerospace epoxy?

Lucas Adheron (07:58):
Well, for adhesives, EN-9120 mandates a
really rigorous, unbroken chainof custody.
This means distributors have toverify the original
manufacturer, OCLEM, or theirauthorized distributor.
That scene is the lowest riskway to get genuine products and
avoid counterfeits.
You absolutely have to trackthe batch or lot number.

(08:18):
That's essential if you need toisolate or recall a specific
production run if a qualityissue pops up.
Documenting the datamanufacturer is critical, too,
for accurate shelf lifemanagement.
You need to ensure only viableproduct gets supplied.

Elena Bondwell (08:31):
And the storage conditions, you mentioned those
being key.

Lucas Adheron (08:33):
Hugely key.
Distributors must ensure thatspecific storage conditions,
temperature, humidity, lightexposure, were maintained
throughout the entiredistribution process.
It's not just about what you doin your warehouse, it's
verifying the conditions beforeit even got to you.
And then, comprehensivedelivery records, tracking the
product from receipt rightthrough to final delivery.
accountability at every step.

(08:54):
The standard even drills downinto specific requirements for
batch and lot splitting to makesure traceability is maintained,
even for sub-batches.

Elena Bondwell (09:01):
I can definitely see why meticulous inventory
management is stressed so muchin our sources then, especially
since adhesives can degrade ifthey're not handled perfectly.
What does that mean on apractical day-to-day level?

Lucas Adheron (09:13):
On a practical level, it means extremely
precise control.
Many aerospace adhesives needprecise temperature control,
often refrigeration actually, tostop them curing too early,
changing viscosity, or justdegrading.
Humidity control is alsocrucial.
Moisture can really negativelyimpact certain chemistries.
Shelf life management isabsolutely paramount.

(09:34):
These things have defined shelflives.
So you need robust inventoryrotation, first in first out
systems, strict expiration datetracking, and you have to
actively prevent degradation,protect them from sunlight
contamination, things like that.
The profound impact here isthat a perfectly manufactured
adhesive can actually becomenon-conforming if its integrity
is compromised just duringstorage.

(09:55):
That could lead to weak bondssevere safety risks.
So the distributor is reallythe first line of defense
against this unseen degradation.

Elena Bondwell (10:03):
And it's not just about the product itself,
is it?
It's also all the crucialpaperwork that has to travel
with it.

Lucas Adheron (10:07):
That's right.
EN 9120 mandates comprehensiveproduct documentation.
This includes Certificates ofConformance, EOC, formal
declarations, saying theadhesive meets all the specified
requirements.
Material Safety Data Sheets,MSDS-SDS, essential for safe
handling, storage, emergencies.
And you also need detailedtechnical specifications
covering properties,performance, often referencing

(10:30):
specific aerospace materialstandards or OEM specs, like
those Boeing BSS standards wementioned.
And all this documentationfeeds directly into the overall
airworthiness certificates forthe final aircraft.
This standard also reinforceswhat's called the purity of
pass-through principle.
It explicitly excludesactivities like custom mixing or
repackaging if that alters theoriginal container integrity.

(10:51):
That's not allowed under EN9120.
If a distributor were to dothat, they'd need AS90100
certification, which has muchstricter manufacturing rules.
This ensures the adhesive'soriginal manufacturer-certified
properties are preserved rightup until it reaches the end
user.

Elena Bondwell (11:06):
So when it comes down to making absolutely sure
the right materials are sourcedfrom the right places, what does
this rigorous approach reallyinvolve?

Lucas Adheron (11:13):
It means rigorous supplier and subcontractor
management.
Essentially, procurement mustbe exclusively from the original
component or equipmentmanufacturers, the OCMs or OEMs,
or their authorizeddistributors.
This is identified clearly asthe lowest risk approach for
getting genuine products andcritically preventing
counterfeits.

Elena Bondwell (11:32):
Okay, let's talk about that risk.
Our source material uses areally chilling phrase.
It calls non-conforming andcounterfeit adhesives a silent
killer.

Lucas Adheron (11:41):
That sounds incredibly serious.
Can you unpack that for us?
It truly is incredibly serious.
Nonconformances are basicallydeviations from the established
standards.
For adhesives, these can comefrom inherent defects, yes, but
also, critically, from improperstorage or handling,
documentation errors, or evensimple human error.
The consequences are severe.
Compromised structuralintegrity.

(12:03):
Potential mission failure.
direct safety risks, highermaintenance costs down the line,
and huge reputational damagefor everyone in the chain.
Counterfeit adhesives take thisdanger a step further.
These could be substandardchemical formulations, maybe
expired materials that have beenrelabeled, or products just
misrepresenting theirproperties.
For example, falsely claimingflame retardancy to that FAR 14

(12:24):
CFR 25.853A standard, or the lowsmoke toxicity to Boeing BSS
72387239.
And the most dangerous part,they're often difficult to
detect visually.
It might even seem functionalinitially, maybe pass some basic
tests.

Elena Bondwell (12:38):
So that's the silent part.
You can't just look at it andtell.

Lucas Adheron (12:40):
Exactly.
That's where the silent killeridea really hits home.
Unlike, say, a visibly bentmetal part, an adhesive could be
structurally compromised bysomething as simple as being
stored at the wrong temperatureor humidity.
Yet, it might look perfectlynormal.
The real danger often isn't inobvious manufacturing defects.
It's in that invisibledegradation that can happen

(13:01):
during distribution, turning acertified product into, well, a
ticking time bomb.
And common sources,unauthorized distributors,
brokers, maybe onlinemarketplaces that bypass the
stringent quality controls.

Elena Bondwell (13:13):
So how does EN other 912 specifically act as a
shield, a formidable shield, asyou say, against these invisible
threats?

Lucas Adheron (13:19):
Well, the standard has several key
mitigation strategies built in.
It puts a really strongemphasis on using authorized
sources, requiring procurementonly from OCMS OEMs or their
authorized distributors.
These are identified as thelowest risk channels.
Independent distributors andbrokers, they're explicitly
flagged as higher risk.
Then there's the rigoroustraceability we talked about.

(13:39):
Being able to track anadhesive's complete history is
paramount.
It's underscored by thisprinciple.
Test if you cannot trace,meaning if you can't fully
verify the chain of custody, youabsolutely must test the
product yourself.

Elena Bondwell (13:51):
Okay, testing if tracing fails.
What else?

Lucas Adheron (13:53):
EN 9120 also includes specific requirements
for the control of dubiousparts.
It mandates clear proceduresfor identifying them,
segregating them, and decidingwhat to do with them
disposition.
And finally, the comprehensivedocumentation and verification
processes we discussed ensureall the necessary paperwork is
there to prove the origin andconformance of the adhesive.

(14:14):
And it's just crucial tounderstand why this is also
critical, because unlike thatcracked metal part, a
non-conforming or counterfeitadhesive might look perfectly
normal.
Its failure mode, like reducedbond strength or maybe increased
flammability, might only showup under operational stress long
after it's been installed.
That's what makes it thatpotential silent killer.
Therefore, EN 920's wholesystem, the traceability, the

(14:37):
meticulous inventory control,authorized sourcing, rigorous
documentation, these processesare the primary defense against
those latent catastrophicfailures you just can't catch
with a visual inspection.

Elena Bondwell (14:47):
Connecting this to the bigger picture then, the
stakes are just incredibly high,aren't they?
Not just for passenger safety,but for the businesses involved
too.
It's not just a quality issue.
It sounds like a profound legaland reputational one.

Lucas Adheron (14:59):
Indeed.
The consequences fordistributors can be severe.
We're talking regulatorynoncompliance, which can lead to
huge financial penalties, lossof certifications, which can
basically shut down yourbusiness in aerospace, maybe
even criminal charges frombodies like the FAA or EASA.
And beyond the legal side,there's these irreparable
reputational damage.
A single incident involving aproduct they distributed can

(15:21):
completely destroy customertrust, ruin future contracts.
So in this sense, EN 9120really acts as a strategic
shield for business continuity.
It safeguards a company'smarket standing and its
integrity within this highlyscrutinized industry.

Elena Bondwell (15:35):
Okay, so it protects against risk.
But our sources also highlighthow EN9120, AS9120 certification
offers real strategicadvantages.
It transforms it from just aregulatory hurdle into a
powerful competitive asset foradhesive distributors.
It's much more than justcompliance, isn't it?

Lucas Adheron (15:50):
Oh, much more.
Absolutely.
First, it directly leads toenhanced quality and
reliability.
I mean, the robust QMSprocesses, the certification
demands, just naturally resultin higher quality, more reliable
ad It ensures their integrityall the way through
distribution.
Second, you often see improvedoperational efficiency and cost
savings.

(16:11):
When you standardize processeslike this, you minimize errors,
reduce redundancies, eliminateinefficiencies.
That leads to smootherworkflows, higher productivity,
and reduced costs.
Think less scrap, less rework,fewer warranty claims.

Elena Bondwell (16:23):
And access to markets.
That seems like a big one.

Lucas Adheron (16:25):
That's massive, yes.
Third point, expanded marketaccess and competitive edge.
The certification basicallyserves as a globally recognized
passport for the aerospaceindustry.
It's recognized by majorcontractors worldwide.
It enables faster entry ontothe OASIS global database.
That's essentially theaerospace industry's central,
trusted online directory forcertified suppliers.

(16:46):
Being listed there is crucialfor visibility, for winning new
tenders, because manufacturerscheck it first.
Major ODMs like Boeing andAirbus explicitly require this
certification.
So, certified distributorsbecome the preferred choice,
often the only choice.
You mentionedBodo Möller Chemie's broad
certification, US, Europe, Indiaand their new Shanghai Center.
That really demonstrates theglobal reach and competitive

(17:08):
edge certification provides.
And finally, it results instrength in customer confidence
and supply chain integrity.
Certification signals a realcommitment to aircraft safety.
It builds credibility withcustomers, regulators, partners.
It fosters strongerrelationships and ultimately a
more reliable aerospaceecosystem.
Plus, it drives continuousimprovement.
AS9120 requires annualsurveillance audits and full

(17:29):
recertification every threeyears, so it ensures quality
management systems are alwaysalways getting better.

Elena Bondwell (17:34):
It really is fascinating how this standard
doesn't just tick a box.
It seems to actually create abetter, more trustworthy global
aerospace ecosystem, reallyraising the bar for everyone
involved.
So thinking practically then,if you're an adhesive
distributor and you're lookingto earn this crucial
certification, what are some ofthe specific challenges you
might face and what are the bestpractices to overcome them?

Lucas Adheron (17:57):
Well, the challenges for adhesive
distributors are pretty uniquegiven the nature of the
products.
You have to manage just a hugediversity of chemical
properties, right?
Epoxies, acrylics,polyurethanes, they all have
unique handling, storage, shelflife needs.
That leads directly to dealingwith varying and often very
sensitive shelf lives, whichdemands precise inventory

(18:18):
rotation.
FIFO first in, first outbecomes critical.
Then there are the specializedstorage conditions we've talked
about, often needing tightlycontrolled environments for
temperature and humidity.
That requires investment ininfrastructure.
There's also the technicalcomplexity of the applications.
Even though distributors don'tapply the adhesives, they need
to understand the applicationrequirements to make sure

(18:39):
they're supplying the rightproduct and the right
documentation.
Maintaining strict controlsduring batch and lot splitting
is another specific hurdle.
And of course, that inherentdifficulty in visually spotting
counterfeit or dubious adhesivesmeans you have to rely heavily
on really robust procurementprocesses and documentation
verification.

Elena Bondwell (18:57):
Okay, so those are the challenges.
What about best practices forgetting certified successfully?

Lucas Adheron (19:02):
Right, best practices.
First, you need a thoroughunderstanding of the standard
itself.
That means diligent study,maybe specialized training.
Then, conduct a reallycomprehensive gap analysis.
Compare your current systems tothe standard's requirements to
see where you fall short.
Systematically implement thenecessary changes that could be
process changes, infrastructureupgrades, documentation updates.

(19:24):
It's absolutely crucial totrain the entire team.
Everyone needs to be aware ofthe requirements, especially
concerning things likecounterfeit parts and
non-conformities.
with an accredited, independentthird-party certification body.
Make sure they have experiencespecifically in the aerospace
industry.
And honestly, leveraging expertconsultation from consultants

(19:44):
with aviation experience can beinvaluable.
They can help interpret thestandard and guide
implementation, which canactually save time and money in
the long run.
and underpinning all of this.
A real commitment to continuousimprovement that's fundamental
to the standard itself.

Elena Bondwell (19:59):
This brings up an important point.
Our sources describe thedistributor as a critical
technical gatekeeper.
What does that really mean inpractice?
Especially when it comes to theactual chemical standards for
these adhesives that directlyimpact an aircraft's performance
and safety.

Lucas Adheron (20:14):
Yeah.
Technical gatekeepers is a goodway to put it.
It means the distributor's rolerequires this fusion, really,
of QMS expertise with deepdomain knowledge of the specific
materials they handle.
The distributor isn't justshuffling boxes and checking
paperwork passively.
They have to actively ensurethat the adhesives comply with
specific technical material andperformance standards.

(20:35):
This elevates them way beyondjust logistics.
They become an activeparticipant in verifying
material compliance.
For instance, we mentionedflame retardancy for cabin
interiors.
The distributor isn't justchecking a box on a COSI form
that says Avar Air 25.853Acompliant.

Elena Bondwell (20:52):
Right.
They They need to understandwhat that means.

Lucas Adheron (20:54):
Exactly.
They need to understand whatmakes it flame retardant
according to that specificregulation and ensure the
certification documents theyreceive are valid, properly
issued, and actually provecompliance.
They're verifying the technicalclaim, not just the piece of
paper.
It applies across the board.
They verify compliance with SAEAerospace Material Standards,
AMS, which define composition,properties, quality for things

(21:17):
like epoxy primers or adhesivefilms.
For interior materials, they'reverifying compliance with
Boeing BSS 7238 for smokedensity and BSS 7239 for
toxicity, making sure materialswon't create extra hazards in a
fire.
For space applications,verifying NASA low outgassing
specs is critical to preventcontamination.
And even on the environmentalside, ensuring RoHS reach

(21:40):
compliance, making sure theadhesives don't contain banned
hazardous substances.
It's a truly complex technicalrole that goes far, far beyond
simple logistics or basicquality checks.

Elena Bondwell (21:49):
So to summarize our deep dive today, EN
9120-0AS-9120 is clearly farmore than just bureaucracy.
It's really an indispensableframework.
It fundamentally underpins thesafety Absolutely.
And maybe

Lucas Adheron (22:11):
a final thought for you to consider.
Think about the next time youstep onto an airplane.
You see the seamless design.
You hear the quiet hum of theengines.
So much of that is enabled byhidden adhesives.
Adhesives whose integrity ismeticulously maintained by this
global network of certifieddistributors following these
rigorous standards.
Kind of raises an importantquestion, doesn't it?
How much do we truly rely onadhesives?

(22:31):
on these unseen forces, thesehidden materials and these
incredibly detailed standards toenable the sophisticated
technologies we often just takefor granted every single day.

Elena Bondwell (22:41):
That really is a powerful thought to leave you
with.
We definitely encourage you toreflect on those unseen layers
of quality and safety in theproducts all around us, or maybe
even explore some specificmaterial science applications
that will make our modern worldpossible.
Thanks for joining us on theDeep Dive.
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