DuPont Pyralux AC091200: 1 oz RA Cu / 1 mil Adhesive / 1 mil PI — Specs & Applications

Walk into most flex circuit fabrication shops and ask them which laminate keeps the line running without drama — chances are they’ll point you toward something in the Pyralux AC family. DuPont Pyralux AC091200 is one of the most frequently specified single-sided flex laminates in general commercial and industrial electronics production, and for good reason: the construction balances copper performance, dielectric thinness, and process compatibility in a way that adhesiveless all-polyimide laminates simply cannot match on cost at moderate performance requirements.

This guide covers the AC091200 construction in engineering detail — what the part number tells you, why the 1 mil acrylic adhesive and 1 mil polyimide combination is a specific design choice rather than an arbitrary default, and where this laminate fits correctly against both thicker Pyralux AC variants and the adhesiveless AP series.

What Is DuPont Pyralux AC091200?

DuPont Pyralux AC091200 is a single-sided flexible copper-clad laminate from DuPont’s Pyralux AC product family. The AC series uses a standard acrylic adhesive bonding system — as opposed to the adhesiveless construction of the AP series — making it a cost-effective, process-friendly option for high-volume flex circuit production where the thermal and electrical performance ceiling of acrylic adhesive is acceptable for the application.

The part number is a complete construction descriptor once you know the coding convention:

Code Segment	Meaning
AC	Acrylic adhesive-based construction
09	1 oz (35 µm) copper weight designation
1	1 mil (25 µm) acrylic adhesive thickness
2	2 mil (50 µm) polyimide base thickness — Note: verify per current DuPont datasheet
00	Standard construction / no supplementary designation

Important: DuPont part number coding conventions for the AC series have evolved across product revisions. Always cross-reference the current DuPont data sheet for AC091200 to confirm the exact adhesive and polyimide thicknesses, as the “1 mil adhesive / 1 mil PI” description in the product title refers to the construction commonly associated with this SKU in the field. Confirm with your distributor or DuPont directly for the current certified specification.

The AC091200 uses rolled annealed (RA) copper — the same grain-oriented copper used in the all-polyimide AP series — bonded via a 1 mil (25 µm) acrylic adhesive to a 1 mil (25 µm) polyimide base film. This is among the thinnest total constructions available in the adhesive-based Pyralux family, which is a core reason it shows up in miniaturized flex assemblies where profile matters but all-polyimide pricing is difficult to justify.

For engineers working through laminate selection on DuPont PCB flex projects, the AC091200 sits in a well-defined performance band: better than FR-series (no acrylic adhesive flame-retardant chemistry tradeoffs), priced below AP-series (no adhesiveless premium), and thin enough for compact single-sided flex applications across consumer electronics, industrial automation, and medical device interconnect categories.

Understanding the 1 mil / 1 mil Construction Logic

The combination of 1 mil acrylic adhesive and 1 mil polyimide is not the default or thickest option in the AC family. It is a deliberate thin-profile construction that trades some mechanical robustness for reduced total stack height. Understanding why engineers specify this combination — versus thicker PI options like 2 mil or 3 mil bases — requires looking at both the mechanical and electrical implications of each layer.

What the 1 mil Polyimide Base Delivers

Polyimide base film at 1 mil (25 µm) provides:

• Reduced total laminate thickness — The thinnest PI option in the AC series, minimizing total build height in single-sided flex assemblies
• Improved flexibility for tight static bend radii — Thinner dielectric reduces outer-fiber strain during single-bend installation
• Lower dielectric contribution to total stack — Useful where total electrical path geometry needs to be tightly controlled

The trade-off is reduced mechanical stiffness and handling durability during fabrication. Very thin PI constructions require careful panel fixturing and handling protocols to avoid deformation during etch, rinse, and lamination processes — a fabrication complexity cost that partly offsets the material cost advantage over thicker variants.

What the 1 mil Acrylic Adhesive Layer Contributes

The acrylic adhesive layer in Pyralux AC091200 is the bond between copper foil and polyimide base. At 1 mil (25 µm) thickness:

• It minimizes adhesive-induced dielectric loss — A thinner adhesive layer reduces the total volume fraction of acrylic (higher Df) in the stack, which slightly improves overall electrical performance versus 2 mil adhesive constructions
• It reduces total build thickness — Critical in assemblies where overall flex cross-section is constrained
• It limits adhesive Tg as the thermal ceiling — The acrylic adhesive Tg (~85–100°C) remains the highest continuous use temperature regardless of adhesive thickness. Thinner adhesive does not raise the Tg

DuPont Pyralux AC091200 Full Technical Specifications

Property	Value	Test Method
Copper Type	Rolled Annealed (RA)	—
Copper Weight	1 oz (35 µm nominal)	IPC-TM-650 2.2.17
Adhesive Type	Acrylic (standard, non-FR)	—
Adhesive Thickness	1 mil (25 µm)	IPC-TM-650 2.2.4
Polyimide Base Thickness	1 mil (25 µm) nominal	IPC-TM-650 2.2.4
Total Laminate Thickness (nominal)	~2.4 mil (61 µm)	—
Peel Strength (as received)	≥ 6.0 lb/in (1.05 N/mm)	IPC-TM-650 2.4.9
Peel Strength (after solder float)	≥ 5.0 lb/in (0.875 N/mm)	IPC-TM-650 2.4.9
Glass Transition Temperature (Tg)	~85–100°C (adhesive-governed)	DSC
Dielectric Constant (Dk) @ 1 MHz	~3.5–3.8 (PI + adhesive blended)	IPC-TM-650 2.5.5
Dissipation Factor (Df) @ 1 MHz	~0.015–0.025 (adhesive-governed)	IPC-TM-650 2.5.5
Volume Resistivity	>10⁹ MΩ·cm	IPC-TM-650 2.5.17
Continuous Use Temperature	Up to ~105°C	—
Moisture Absorption	<2.0%	IPC-TM-650 2.6.2
Flammability	Not inherently V-0 (non-FR AC series)	UL 94

Flammability Note: The standard Pyralux AC (non-FR) series does not carry UL 94 V-0 flame rating. For applications requiring V-0 compliance, specify Pyralux FR series laminates with flame-retardant acrylic adhesive. Confirm your application’s regulatory requirements before selecting AC091200.

Pyralux AC091200 vs Key Alternatives: When to Specify Which

One of the most practical things you can do with this specification comparison is understand the cost-performance trade space across DuPont’s flex laminate families. AC091200 occupies the thin, cost-efficient adhesive-based end of the spectrum.

Parameter	AC091200	Pyralux FR (e.g., FR9110D)	Pyralux AP (e.g., APL3111R)
Construction	Acrylic adhesive	FR acrylic adhesive	Adhesiveless all-polyimide
Adhesive Tg	~85–100°C	~85–100°C	None (>250°C PI only)
Dk @ 1 MHz	~3.5–3.8	~3.5–4.0	~3.5
Df @ 1 MHz	~0.015–0.025	~0.020–0.030	~0.003
UL 94 Flammability	Not V-0 (standard AC)	V-0	V-0 (with rated coverlay)
Operating Temperature	Up to ~105°C	Up to ~105°C	-65°C to +220°C
Relative Material Cost	Low	Low–Moderate	High
Best Fit Applications	Non-FR consumer/industrial flex	Consumer electronics requiring V-0	Aerospace, medical, high-speed

The message from that comparison is clear: AC091200 is the right call when your application does not require V-0 flame rating, your operating temperature stays well below 85°C in normal use, your signal frequencies are below 1 GHz, and cost control is a primary design requirement.

Primary Application Areas for DuPont Pyralux AC091200

Consumer Electronics Flex Interconnects

The camera module flex, display connector flex, and battery connector flex in smartphones and tablets are classic AC-series applications. Operating temperatures are moderate, component count on the flex is low, and the assembly volume makes material cost a critical design input. AC091200’s thin 1 mil PI / 1 mil adhesive construction fits the minimal Z-height requirements of handheld device internal flex routing without the premium of all-polyimide construction.

Industrial Automation and Sensor Wiring

Flex circuits in industrial sensors, encoder feedback cables, and panel-mount control wiring use AC-series laminates where the operating temperature stays within the acrylic adhesive’s capability and the signal frequencies are in the audio-to-low-MHz range. AC091200 provides adequate electrical performance for these applications at fabrication costs that support competitive product pricing.

Medical Device Non-Implantable Flex

Diagnostic equipment, patient monitoring wearables, and external medical device flex interconnects frequently use Pyralux AC-series laminates. Applications that do not require UL 94 V-0 (or where V-0 is achieved through external enclosure ratings rather than laminate rating) and that stay within the moderate operating temperature range can be cost-effectively served by AC091200.

Low-Volume Prototyping and Design Validation

AC091200’s availability through standard flex laminate distributors, its compatibility with conventional flex fabrication processes (no special NiCr etch, no adhesiveless bonding requirements), and its relatively low cost make it a common prototyping substrate. Engineers developing a new flex design who don’t yet need to commit to AP-series pricing can validate form, fit, and basic electrical function on AC091200 before upspecifying for production.

Application Fit Summary

Application	AC091200 Fit	Reason
Consumer electronics flex cables	✅ Excellent	Thin, low cost, adequate performance
Industrial sensor flex interconnects	✅ Good	Cost-effective, standard process
Prototype / design validation flex	✅ Excellent	Low cost, standard fabrication
Non-implantable medical device flex	✅ Good	Adequate for moderate temp, non-V-0
Automotive under-hood flex (>105°C)	❌ Not suitable	Acrylic adhesive Tg limitation
Aerospace / military flex	❌ Not suitable	Tg, temp range, reliability reqs
High-frequency RF flex (>1 GHz)	⚠️ Not recommended	Df too high for RF signal integrity
Applications requiring UL 94 V-0	❌ Use FR series	AC series is not rated V-0
Dynamic flex (high cycle count)	✅ RA copper helps	Verify bend radius per IPC-2223

Design Guidelines When Using AC091200

Minimum Bend Radius

With 1 mil PI and 1 oz RA copper, AC091200 is among the more flexible constructions in the AC family. Apply IPC-2223 guidelines:

• Static flex (single bend during installation): Minimum bend radius = 6× total laminate thickness ≈ 0.37 mm minimum
• Dynamic flex: Minimum bend radius = 100× copper thickness = 3.5 mm for 35 µm (1 oz) copper

The RA copper grain orientation provides better flex life than equivalent ED copper constructions — specify trace routing parallel to the bend axis wherever possible to maximize flex endurance.

Thermal Processing Caution

The acrylic adhesive Tg of approximately 85–100°C means lead-free reflow profiles (peak ~260°C) must be managed carefully. Excessive dwell time above Tg during reflow can cause adhesive softening and copper-to-PI delamination. Work with your assembler to confirm a reflow profile that minimizes time above 100°C while still achieving adequate solder joint formation — typically a fast ramp-and-cool profile rather than a prolonged plateau.

Useful Resources for DuPont Pyralux AC091200

Resource	Description	Link
DuPont Pyralux AC Product Page	Official data sheets, product selector	dupont.com/pyralux
IPC-2223 Flex Circuit Design Standard	Design rules for flexible printed boards	ipc.org
IPC-TM-650 Test Methods Manual	Test methods for laminate qualification	ipc.org/test-methods
IPC-6013 Flex PCB Qualification Spec	Performance qualification for flex circuits	ipc.org
UL Product iQ Database	Verify UL 94 ratings for flex laminate products	iq.ul.com
IPC-4202 Flexible Base Dielectrics Standard	Base material specification for flex circuits	ipc.org
PCBSync DuPont PCB Resources	Fabrication guidance for DuPont flex laminates	pcbsync.com/Dupont-pcb

Frequently Asked Questions About DuPont Pyralux AC091200

Q1: Does DuPont Pyralux AC091200 have a UL 94 V-0 flame rating?

No. The standard Pyralux AC series uses a non-flame-retardant acrylic adhesive and does not carry a UL 94 V-0 rating at the laminate level. If your application’s safety standard or OEM specification requires UL 94 V-0 compliance from the flex laminate itself, you need to specify the Pyralux FR series — which uses a brominated flame-retardant acrylic adhesive to achieve V-0 — rather than the AC series. Some system-level V-0 compliance can be achieved through enclosure design even with non-rated flex laminates, but verify this against your specific regulatory submission requirements.

Q2: What is the maximum continuous operating temperature for AC091200?

The acrylic adhesive layer governs the thermal ceiling. With an adhesive Tg of approximately 85–100°C, continuous operating temperatures above 85°C will progressively degrade adhesive mechanical properties — and sustained exposure above 100°C risks delamination under any mechanical stress. For design margin, target a maximum continuous operating temperature of 70–80°C with AC091200. Applications with operating temperatures above this threshold should be evaluated against Pyralux AP-series all-polyimide laminates with >250°C Tg.

Q3: Can DuPont Pyralux AC091200 be used for high-speed digital signal routing?

At signal frequencies below 500 MHz, the Df of the acrylic adhesive system (~0.015–0.025 at 1 MHz) is tolerable for most non-precision digital interconnect applications. Above 1 GHz, the combined adhesive and polyimide dielectric loss becomes a meaningful contributor to insertion loss, and the Dk variability under temperature and moisture changes creates impedance instability. For controlled impedance work above 1 GHz, move to adhesiveless AP-series laminates with Df ~0.003. AC091200 is appropriate for low-to-moderate frequency digital and analog signal routing where insertion loss budget is generous.

Q4: How does AC091200 compare to Pyralux AP laminates for general commercial flex applications?

AC091200 and the AP series serve different performance and cost tiers. AC091200 costs significantly less and processes on standard flex fabrication lines without the specialized bonding processes required for adhesiveless AP laminates. Its acrylic adhesive limits operating temperature to ~105°C and raises Df versus AP’s ~0.003. AP laminates are the right choice for aerospace, military, high-temperature, or high-frequency applications where performance requirements justify the cost premium. For commercial consumer electronics and industrial flex at moderate temperatures and signal frequencies, AC091200’s performance is fully adequate and its cost advantage is meaningful at volume.

Q5: Where can I download the official DuPont Pyralux AC091200 data sheet?

The current data sheet is available directly from DuPont’s official product portal at dupont.com under the Pyralux Flexible Materials product section. Navigate to the AC product family and search for part number AC091200. Authorized distributors — including Insulectro, DandH Distributing, and regional Pyralux distribution partners — also carry current certified data sheets and can provide them on request alongside material certificates for production qualification documentation. Always pull from DuPont directly or a tier-one authorized distributor rather than third-party aggregator sites, as specification revisions are not always reflected on non-official sources.

Conclusion

DuPont Pyralux AC091200 earns its place as one of the most widely specified single-sided flex laminates in commercial electronics manufacturing not because it tops any single performance chart, but because its construction is correctly matched to the broad middle ground of commercial flex design requirements. The 1 mil acrylic adhesive and 1 mil polyimide combination produces a thin, processable, cost-efficient laminate that handles moderate temperatures, low-to-mid-frequency signals, and general-purpose dynamic and static flex applications without the material cost of all-polyimide construction.