BP4260-180 4260nm Bandpass Filter | OD2 Mid-IR Optical Filter

BP4260-180 (4260nm CWL, OD2@400-11000nm, FWHM=180nm) Bandpass Filter

4260nm \ 180nm \ OD2@400-11000nm / T＞80% / 3.3×3.3mm

$10.00

BP4260-180 (4260nm CWL, OD2@400-11000nm, FWHM=180nm) Bandpass Filter

SO3020178

SO3020178-3.3×3.3

In stock

$10.00

Yes. Listed filters are generally available from stock, but final availability may depend on size and quantity.

Most filters are kept as medium-sized coated pieces
Final size is usually diced before shipment
Preparation time may vary for urgent orders, custom sizes, or larger quantities

We can usually cut optical filters to custom outer sizes, depending on available coated material.

Custom size

Typical custom size range: 3 × 3mm to 60 × 60mm
Custom sizing changes the outer dimension only
Thickness normally follows the original filter specification
Final feasibility depends on coated material size and cutting requirements

Mounting

Standard mounting options are
dia12.5mm (mounted) - OD = dia12.5mm,Thickness=3.5mm,No Thread
dia25mm (mounted) - OD = dia25mm,Thickness=3.5mm,No Thread
Mounted options can include non-threaded or threaded mounts
Custom mounting may be possible depending on quantity and mechanical requirements

Note

Please send the required size, quantity, mounting type, and product link before ordering.

Yes. You may request the transmission curve or related spectral data for engineering review.

Copy the link of the product page and send email to shop@syronoptics.com, you will get reply within 1 working days.

We ship optical products to most supported regions, with shipping cost and delivery method confirmed before payment.

Shipping cost

Shipping is generally USD 5–40 per parcel
Orders above USD 300 are eligible for free shipping
Final cost depends on destination, package size, order value, and shipping method
Shipping cost is shown during checkout or confirmed before payment

Shipping coverage

We generally ship to Europe, North America, Asia, the Middle East, and Oceania
Some countries may be unavailable depending on logistics or customs conditions

Delivery time

Most stocked products need 1–5 working days for preparation before shipment
After shipment, delivery time depends on destination and shipping method
Tracking information will be provided when available

Note

If your destination is not available during checkout, please contact us before ordering.

You can order online, request a quotation, or use bank transfer depending on your purchasing process.

Can I request a quotation before ordering?

Yes, formal quotations are available before payment
Recommended for company purchases, larger quantities, custom sizes, or special shipping requirements
Please send the product link, quantity, destination country, and billing details if available

What online payment methods are available?

Credit card
Apple Pay
Google Pay

Do you support bank transfer?

Yes, bank transfer is available
We support multi-currency payment through local banking where available
Local receiving accounts may include US, UK, Germany, Singapore, and Hong Kong bank accounts
For payment in Chinese RMB inside Mainland China, please contact our local partner
VAT fapiao may be supported for eligible Mainland China transactions

Do you support company purchase orders?

Company purchase orders may be supported after confirmation
Please contact us before ordering if your organization requires PO processing, quotation, or invoice matching

Are NET payment terms available? (Pay after received)

NET 7 or NET 30 terms may be available for eligible organizations
Approval depends on company type, order value, payment history, and internal review
Please contact us before ordering if you need NET payment terms

mport duties, taxes, and customs handling depend on your destination country and shipping method.

Are duties and taxes included?

For express courier services such as DHL or FedEx, duties, taxes, and customs handling are usually paid by the buyer
The final import cost depends on destination country, declared value, and local customs rules
Duties and taxes are not included unless clearly confirmed before payment

Can SyronOptics help with import clearance?

Import-handled delivery may be available for selected regions
Supported regions may include USA, Canada, United Kingdom,Europe, Mainland China, Hong Kong, Singapore, Australia, and New Zealand
With import-handled delivery, we help arrange clearance and local delivery
This option may be slower than express courier

Note

If you are not sure, please contact us to confirm whether import-handled delivery is supported in your region.

Wavelength: 4260nm center wavelength (CWL) for mid-infrared applications
Spectral Features: FWHM = 180nm bandwidth for precise spectral isolation
Optical Density: OD2 blocking from 400-11000nm for superior out-of-band rejection
Filter Dimension Availability: Custom sizes available for research and industrial imaging systems

Specifications for product BP4260-180 (4260nm CWL, OD2@400-11000nm, FWHM=180nm) Bandpass Filter
Optical Specification
Center Wavelength (CWL)	4260nm
FWHM	180nm
Blocking Region	OD2@400-11000nm
Peak Transmission (%)	80
Part Number
PN	SO3020178

BP4260-180 Bandpass Filter - Carbon Dioxide (CO2) Gas Detection

Carbon Dioxide (CO2) Gas Detection

This filter is perfectly tuned to 4260nm (4.26 micrometers), which is the exact wavelength of invisible infrared light that Carbon Dioxide heavily absorbs. By putting this filter inside an air sensor, the detector only "sees" this specific light. If there is a lot of CO2 in the air, the gas absorbs the light, and the sensor sees a drop in brightness. This is the main technology (called NDIR) used in indoor air quality monitors, smart home ventilation systems, and industrial safety alarms.

Recommended light source:
Thermal Infrared Emitters (Micro-heaters): They are inexpensive, reliable, and act like tiny hot plates that naturally give off a broad amount of infrared heat/light for the filter to use.
Mid-Infrared LEDs (MIR-LEDs tuned to ~4.3µm): They use very little power and can be turned on and off almost instantly, making them perfect for battery-powered, portable smart-home monitors.

BP4260-180 Bandpass Filter - Medical Breath Analysis (Capnography)

Medical Breath Analysis (Capnography)

During surgery, anesthesia, or intensive care, doctors need to monitor exactly how much CO2 a patient is exhaling to ensure their lungs are working correctly. This filter is placed in the breathing tube sensors to precisely count the CO2 levels without getting confused by moisture or other gases in the patient's breath.

Recommended light source:

High-Speed Mid-IR LEDs: They react incredibly fast, which is necessary to catch the rapid, split-second changes in CO2 levels every single time a person breathes in and out.
High-Performance Thermal Emitters: They provide a very steady, continuous, and strong beam of light, which is critical for life-saving medical devices that require extreme, unwavering accuracy over many hours.

Product Faqs

Yes. Send us your wavelength, size, optical setup, and application. We can help check whether this product is suitable or suggest an alternative.

Yes. Transmission curves, drawings, or additional specifications may be available on request depending on the product.

Some products can be customized by size, mounting, wavelength, coating, or package. Custom availability depends on the product type and project requirements.

Contact us with your target specification. We can check stocked alternatives or advise whether a custom option is possible.

Still not sure if this product fits?

Send us your wavelength, size, quantity, application, and any drawing or specification you have. We can help check whether this product is suitable or suggest a stock or custom alternative.