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<title><![CDATA[EC21 Product Catalogs - 4 layers]]></title>
<link><![CDATA[https://www.ec21.com/ec-market/4_layers--10120399/1/4 layers.html]]></link><item>
<title><![CDATA[4 Layer ENIG Impedance Control Half Hole PCB Electric Circuit Board]]></title><link><![CDATA[https://hhcircuits.en.ec21.com/4_Layer_ENIG_Impedance_Control--11798970_11798976.html]]></link><description><![CDATA[Number of layers: 4
Surface finish: ENIG
Base material: FR4
Outer Layer W/S: 6/4mil
Inner layer W: 21mil
Thickness: 0.4mm
Min. hole diameter: 0.2mm
Special process: impedance control+half hole
Advant]]></description><pubDate><![CDATA[20230530]]></pubDate></item>
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<title><![CDATA[PCB - Hdi]]></title><link><![CDATA[https://ckmo1018.en.ec21.com/PCB_Hdi--12069932_12069957.html]]></link><description><![CDATA[Layer Structure
• Rigid Area: 2-N Layers (FR-4-based)
• Flex Area: 1-4 Layers (PI-based)
• Overall Structure: Rigid + Flex + Rigid (Multi-Foldable)
Selection Criteria 
• Simple Folding/Connec]]></description><pubDate><![CDATA[20260411]]></pubDate></item>
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<title><![CDATA[Professional Medical Equipment PCBA One-Stop PCB Assembly]]></title><link><![CDATA[https://tecoopcba.en.ec21.com/Professional_Medical_Equipment_PCBA_One--12055073_12055058.html]]></link><description><![CDATA[layer count boards, fine-pitch components, and various surface finishes. We adhere to strict quality control processes throughout the manufacturing cycle.
4. PCB Assembly: We offer a full range of PC]]></description><pubDate><![CDATA[20260429]]></pubDate></item>
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<title><![CDATA[Grande | Leading EMS Provider | PCBA and Medical Oxygen Controller]]></title><link><![CDATA[https://yygreattong.en.ec21.com/Grande_Leading_EMS_Provider_PCBA--4357166_4357194.html]]></link><description><![CDATA[Supplier: Grande Electronics
Layers: 4
PCB：FR-4/1.6mm, 1oz finished copper
Project: Grande | Leading EMS Provider | PCBA and Medical Oxygen Controller
Surface Treatment: HASL
PCBA Lead time:3-4 wee]]></description><pubDate><![CDATA[20250401]]></pubDate></item>
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<title><![CDATA[Material Handling Equipment Circuit Board Industrial PCBA Electronics]]></title><link><![CDATA[https://pcbdesign12.en.ec21.com/Material_Handling_Equipment_Circuit_Board--10035716_10038624.html]]></link><description><![CDATA[Supplier: Grande Electronics
Project: Material Handling Equipment Circuit Board Industrial PCBA Electronics
Layers: 4
PCB：FR-4/1.6mm, 1oz finished copper
Surface Treatment: ENIG
PCBA Lead time:3-4 ]]></description><pubDate><![CDATA[20250401]]></pubDate></item>
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<title><![CDATA[Dust Collector PCBA Manufacturer PCB Assembly Serviece]]></title><link><![CDATA[https://lfynet.en.ec21.com/Dust_Collector_PCBA_Manufacturer_PCB--7967651_12008639.html]]></link><description><![CDATA[layer PCB with competitive price, good quality and excellent service.2. CEM-1, FR-4, FR-4 High TG, Aluminum base material3. Quantities range from prototype to medium batch production.4.100% test
]]></description><pubDate><![CDATA[20240923]]></pubDate></item>
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<title><![CDATA[China PCB Factory Electronic Circuit Board Assembly HASL Lead Free PCB Assembly Service PCBA]]></title><link><![CDATA[https://xubo783156718.en.ec21.com/China_PCB_Factory_Electronic_Circuit--11984085_12004964.html]]></link><description><![CDATA[4; High TG FR-4; Aluminum; CEM-1; CEM-3; Rogers, etc
PCB type
Rigid, flexible, rigid-flexible
Layer NO.
1, 2, 4, 6, up to 24 layer
Shape
Rectangular, round, slots, cutouts, complex, irregular
Max PCB]]></description><pubDate><![CDATA[20240914]]></pubDate></item>
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<title><![CDATA[Standard PCB]]></title><link><![CDATA[https://pcbmain68.en.ec21.com/Standard_PCB--11046819_11046822.html]]></link><description><![CDATA[4mils and track spacing down to 4mils, 5mils minimum annular rings and minimum drill sizes down to 0.2mm (8mils). Additionally, we can manufacture PCB up to 16 layers in layer count and 500x500 mm in]]></description><pubDate><![CDATA[20240606]]></pubDate></item>
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<title><![CDATA[OEM PCBA Manufacturer Customize]]></title><link><![CDATA[https://idsystemkr.en.ec21.com/OEM_PCBA_Manufacturer_Customize--11944840_11944841.html]]></link><description><![CDATA[PCB/PCBA &amp; SMT
(1) Consumer Electronic Device
(2) 2/4/6/8 layers or higher
(3) Special Production Process: Hole by Etching, Button Plate, Laser Drill, Build-up
(4) High Quality Control System, Quick ]]></description><pubDate><![CDATA[20240530]]></pubDate></item>
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<title><![CDATA[Heavy Copper Printed Circuit Board]]></title><link><![CDATA[https://bgpcba.en.ec21.com/Heavy_Copper_Printed_Circuit_Board--11935225_11935290.html]]></link><description><![CDATA[layers than standard PCBs. While standard PCBs typically feature copper layers ranging from 1 oz to 3 oz (ounce per square foot), heavy copper PCBs can have copper layers exceeding 4 oz, with some de]]></description><pubDate><![CDATA[20240512]]></pubDate></item>
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<title><![CDATA[Semi-Auto Strapping Machine PCBA | Assembled Printed Circuit Boards]]></title><link><![CDATA[https://grandepcba.en.ec21.com/Semi_Auto_Strapping_Machine_PCBA--11194245_11194246.html]]></link><description><![CDATA[Supplier: Shenzhen Grande Electronics Layers:4PCB：FR-4/1.6mm, 1oz finished copper Application: Semi-Auto Strapping Machine PCBA | Assembled Printed Circuit BoardsSurface Treatment:ENIGPCBA Lead tim]]></description><pubDate><![CDATA[20240506]]></pubDate></item>
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<title><![CDATA[OEM PCBA Manufacturer Customize LED Bead Light Board   One-stop Turnkey PCBA]]></title><link><![CDATA[https://leadsintec2024.en.ec21.com/OEM_PCBA_Manufacturer_Customize_LED--11911491_11916228.html]]></link><description><![CDATA[4 /aluminum/ceramic CEM1
Solder mask
Green. Red. Blue. White. Black.Yellow
Board Thickness
0.5-4mm
Layer
1-8 Layers
Copper Thickness
0.5-4OZ
Testing Service
AOI X-Ray Function Test
]]></description><pubDate><![CDATA[20240326]]></pubDate></item>
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<title><![CDATA[4L Electronic Scuba Blue Popular PCB Board]]></title><link><![CDATA[https://hjl39506147520.en.ec21.com/4L_Electronic_Scuba_Blue_Popular--11890882_11907637.html]]></link><description><![CDATA[Layers or Boards/ class 2
IPC-SM-840 Qualification and Performance of permanent polymer coatings
MIL-PFR-55110 Military Performance and Specifications-Tucson
IPC-6018 Microwave End Product Board Insp]]></description><pubDate><![CDATA[20240229]]></pubDate></item>
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<title><![CDATA[Sale NEW Bambu Lab X1 Carbon Combo I High Speed CoreXY 3D Printer - Best Price]]></title><link><![CDATA[https://link3d.en.ec21.com/Sale_NEW_Bambu_Lab_X1--11840187_11840214.html]]></link><description><![CDATA[The Bambu Lab X1-Carbon Combo with Automatic Material System (AMS) is a prosumer FDM 3D printer using the CoreXY design. It&apos;s stuffed with high technology like LiDAR for bed leveling, first layer cal]]></description><pubDate><![CDATA[20230831]]></pubDate></item>
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<title><![CDATA[12Layer  Printed Circuit Board]]></title><link><![CDATA[https://ayesha19920906.en.ec21.com/12Layer_Printed_Circuit_Board--11384985_11384986.html]]></link><description><![CDATA[Layer ELIC 0.8mm board thickness,0.35 Pitch BGA, 50um Line widthOSP + Selective ENIG 
Product: Customized OEM PCB Manufacturing Service with Gerber File
Material: FR4, Aluminum, CEM-3,CEM-1, HI-TG, R]]></description><pubDate><![CDATA[20210604]]></pubDate></item>
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<title><![CDATA[20 Layers OEM Circuit Board Design PCB Surface Mount Fabrication]]></title><link><![CDATA[https://cttpcb.en.ec21.com/20_Layers_OEM_Circuit_Board--10919275_11050438.html]]></link><description><![CDATA[20 layers OEM circuit board design PCB surface mount fabrication
Custom PCB assembly
, PCBA Supplier
4 YAMAHA High-speed SMT Lines
6 million daily SMT placements capability
400,000 daily DIP placemen]]></description><pubDate><![CDATA[20231206]]></pubDate></item>
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<title><![CDATA[PCB Design Capabilities]]></title><link><![CDATA[https://gtpcba.en.ec21.com/PCB_Design_Capabilities--11805203_11836258.html]]></link><description><![CDATA[Layer management for signal integrity and impedance control
• DDR, DDR2, DDR3, DDR4, SAS and differential pair routing expertise
• High-density SMT designs (BGA, uBGA, PCI, PCIE, CPCI…)
• Bli]]></description><pubDate><![CDATA[20230821]]></pubDate></item>
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<title><![CDATA[Medical Electronics Turnkey PCB Assembly]]></title><link><![CDATA[https://ucreatepcb123.en.ec21.com/Medical_Electronics_Turnkey_PCB_Assembly--11761239_11826375.html]]></link><description><![CDATA[4L ; 72 hours for 6L.
3. Component purchase: 2 days if all components is available in our domestic market. 
4. PCB Assembly: samples: within 8 days / mass production: within 12 days
LAYER
PROTOTYPE
M]]></description><pubDate><![CDATA[20230728]]></pubDate></item>
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<title><![CDATA[Loudspeaker PCB]]></title><link><![CDATA[https://techighpcb.en.ec21.com/Loudspeaker_PCB--11812588_11812591.html]]></link><description><![CDATA[Layer
4L
Copper thickness
Inner 2OZ,outer 2OZ
Special process
Resin plugging and POFV (plated over filled vias)
Surface treatment
Immersion gold
3.Product Feature And Application 
Industry controllin]]></description><pubDate><![CDATA[20230628]]></pubDate></item>
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<title><![CDATA[Aluminium PCBs]]></title><link><![CDATA[https://haosens2010.en.ec21.com/Aluminium_PCBs--4624610_7010616.html]]></link><description><![CDATA[Base material: Aluminium Thermal conductivity: 4W / m.K Layer count: 1 layer Thickness: 1.60mm Copper thickness: Finished:1oz Surface finish: Lead free HASL Color of S/M: White Color of silkscreen: B]]></description><pubDate><![CDATA[20130708]]></pubDate></item>
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<title><![CDATA[Flexible PCB (FPC)]]></title><link><![CDATA[https://tendtronic.en.ec21.com/Flexible_PCB_FPC--9385605_9497819.html]]></link><description><![CDATA[layer PCB(4~6 layers): 4~6 Day QTA sample. 
Multilayer PCB(8~12 layers): 7~8 Day QTA sample. 
10~15 Day Mass production first lot. 
Packing and Shipping Departments ensure that the product is accurat]]></description><pubDate><![CDATA[20150505]]></pubDate></item>
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<title><![CDATA[MCPCB Manufacturing for LED Products]]></title><link><![CDATA[https://abiscircuits.en.ec21.com/MCPCB_Manufacturing_for_LED_Products--10327532_10327540.html]]></link><description><![CDATA[1
Layer
1-2 layers
2
Material
Aluminum base
3
Board thickness
0.3mm-5mm
4
Max.finished board size
1200*560mm
5
Min hole size
0.3mm(12mil)
6
Min.line width
0.1mm(4mil)
7
Min.line spacing
0.1mm(4mil)
8]]></description><pubDate><![CDATA[20200402]]></pubDate></item>
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<title><![CDATA[Woodworking Machinery Pcba Housing Pcba Service Electronic Assembly Shenzhen PCBA Factory]]></title><link><![CDATA[https://440183199803063144.en.ec21.com/Woodworking_Machinery_Pcba_Housing_Pcba--11408756_11473653.html]]></link><description><![CDATA[Layers: 5 to 7working days
4-8 Layers: 12 working days
Mass production:
1-2 Layers:7 to 15 working days
4-8 Layers:10 to 18 working days
The lead time depends on your final confirmed quantity.
Q6:Wha]]></description><pubDate><![CDATA[20220530]]></pubDate></item>
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<title><![CDATA[Rogers Rt/Duroid 5880]]></title><link><![CDATA[https://karenxcepcb.en.ec21.com/Rogers_Rt_Duroid_5880--10524601_10524661.html]]></link><description><![CDATA[Detailed Product Description
Color:
Yellow
Material:
Rogers Material
Layer:
Multilayer
Board Size:
3*9cm
Copper Thinknes:
1 Oz
Min Line Width:
4 Mil
Min Line Space:
4mil
Surface Finish:
Immersion Gol]]></description><pubDate><![CDATA[20170829]]></pubDate></item>
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<title><![CDATA[CEM-3 Electronic SMT PCB Assembly with OSP Surface Finish 2oz Copper Thickness]]></title><link><![CDATA[https://smtpcbaassemblycom.en.ec21.com/CEM_3_Electronic_SMT_PCB--11887216_11887217.html]]></link><description><![CDATA[layerCopper Thickness1/2oz, 1oz, 2oz, 3oz, 4ozMaterialFR-4, FR-1, CEM-1, CEM-3, AluminumLead Time2-3 WeeksSolder Mask ColorGreen, Blue, White, Black, Red, YellowApplicationsIndustrial Electronic Comp]]></description><pubDate><![CDATA[20240112]]></pubDate></item>
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<title><![CDATA[FR4 Base LED PCB Circuit Board 1oz Copper 3/3MIL Min Line]]></title><link><![CDATA[https://electronicpcbboard.en.ec21.com/FR4_Base_LED_PCB_Circuit--11895685_11895686.html]]></link><description><![CDATA[Layers1-28 layers1-14 layersMIN Line width(mil)3mil4milMIN Line space(mil)3mil4milMin via (mechanical drilling)Board thickness≤1.2mm0.15mm0.2mmBoard thickness≤2.5mm0.2mm0.3mmBoard thickness＞2.5]]></description><pubDate><![CDATA[20240131]]></pubDate></item>
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<title><![CDATA[Aluminum PCB]]></title><link><![CDATA[https://ronghuaindustry.en.ec21.com/Aluminum_PCB--11791188_11794567.html]]></link><description><![CDATA[layer structure, which are circuit layers (copper foil), insulation layers and metal grassroots. It is commonly used for LED lighting products. There are positive and negative sides, one white side i]]></description><pubDate><![CDATA[20230521]]></pubDate></item>
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<title><![CDATA[PCB Surface]]></title><link><![CDATA[https://greenstone23.en.ec21.com/PCB_Surface--11778431_11778453.html]]></link><description><![CDATA[4 mils.
The silkscreen layer is the top layer of the printed circuit board
and serves as a reference indicator for placing components on the PCB. The graphics and text on PCB, a circuit board is usua]]></description><pubDate><![CDATA[20230428]]></pubDate></item>
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<title><![CDATA[PCB for LED Panel Light]]></title><link><![CDATA[https://yooproo.en.ec21.com/PCB_for_LED_Panel_Light--11604511_11604583.html]]></link><description><![CDATA[Layer4
Thickness0.8mm/1.00mm/1.2mm/1.5mm etc
Solder maskBlack/white/White oil etc
Insulating materialOrganic resin
Outer copper1 OZ
Insulating resinPI
Flame retardant class94-V0
Dielectric constantPI]]></description><pubDate><![CDATA[20220718]]></pubDate></item>

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