Low Aluminum Equivalent:The Overlooked Metric That Defines CT Table Performance

In medical imaging,every component in the X-ray beam path is either a window or a wall.Your core material decides which one it is.

CT scanner patient tables present a unique engineering challenge:the sandwich panel must bear significant patient weight over years of service,survive the rigors of high-temperature composite manufacturing,and remain virtually invisible to X-rays.It's a structural,thermal,and radiological problem wrapped into one component.

Our XTylene®Tx Series PMI Foam addresses this triple requirement through molecular architecture and closed-cell design.

1.The Aluminum Equivalent Baseline:Why It Matters

Aluminum equivalent measures how much a material attenuates X-rays,expressed as the thickness of pure aluminum that would produce the same attenuation.For CT table cores,the requirement is simple:as close to zero as possible.

If the core absorbs too much radiation,two things happen.The image acquires artifacts—shadows and noise that obscure clinical detail.And the system compensates by increasing X-ray intensity,exposing the patient to a higher radiation dose.

PMI foam achieves inherently low aluminum equivalent because its polymer backbone contains only carbon,hydrogen,oxygen,and nitrogen.No heavy metals.No halogenated fillers.Just four light elements that X-rays pass through with minimal interaction.

This is not an additive property.You cannot make a poor core material radiolucent by coating it.Transparency to X-rays is built into the molecular structure or it isn't.

2.The 180°C Manufacturing Reality

CT table sandwich panels are typically manufactured with carbon fiber skins and epoxy prepreg systems cured at elevated temperatures.The core material must survive this cycle without dimensional collapse.

The Tx Series carries a glass transition temperature of 210–235°C.At the standard 180°C autoclave cure,it remains deep in its glassy state.No creep.No thickness loss.No skin dimpling that would compromise the smooth,uniform surface a patient table demands.

This thermal headroom is not about extreme performance—it's about process reliability across batch after batch of production.

3.Moisture Immunity Over the Device Lifetime

A CT table is not a disposable component.It serves for years,often in environments with temperature and humidity variation.A core material that absorbs moisture will experience dielectric and mechanical drift over time.

With closed-cell content exceeding 95%,the Tx Series resists moisture uptake throughout the product lifecycle.The radiolucency you validate at installation remains stable years later.

️Precision Machined,Delivered Ready to Layup

For this recent shipment,we machined the Tx Series foam to the customer's exact CAD profile—contoured,chamfered,and fully inspected.Shipped ready for integration into their composite layup process.

Backed by our in-house multi-axis CNC facility and Zero MOQ prototyping policy,we support everything from first-article validation to serial production volumes.

Let's Talk Medical Imaging Structures

If you're developing CT tables,DR panels,mammography positioning devices,or any radiolucent structural component,we can provide:

Measured aluminum equivalent data for your frequency range of interest

Tg and creep data for your specific cure profile

CNC-machined evaluation blocks to your geometry

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