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<title><![CDATA[EC21 Product Catalogs - 4 layers board]]></title>
<link><![CDATA[https://www.ec21.com/ec-market/4-layers-board--10120399/1/4 layers board.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[board that implements ultra-high-density, high-performance circuits through fine patterns and microvias.
Specifications
Layer Structure
• Rigid Area: 2-N Layers (FR-4-based)
• Flex Area: 1-4 Laye]]></description><pubDate><![CDATA[20260411]]></pubDate></item>
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<title><![CDATA[ISO-Certified Automotive Sound System PCBA Supplier]]></title><link><![CDATA[https://tecoopcba.en.ec21.com/ISO-Certified-Automotive-Sound-System--12056085_12058137.html]]></link><description><![CDATA[Boards
• High-Performance Digital Amplifiers
• Precision DSP Audio Processors
Cutting-Edge Technical Expertise:
• Multilayer PCB Fabrication (4-12 Layers)
• SMT &amp; Through-Hole Assembly Capabi]]></description><pubDate><![CDATA[20250801]]></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[Glass Edge Detection Machine Printed Circuit Board Manufacturer- 58pcba.Com]]></title><link><![CDATA[https://yygreattong.en.ec21.com/Glass-Edge-Detection-Machine-Printed--4357166_4357236.html]]></link><description><![CDATA[Supplier: Grande Electronics
Layers: 4
PCB：FR-4/1.6mm, 1oz finished copper
Project: Glass Edge Detection Machine Printed Circuit Board Manufacturer- 58pcba.com
Surface Treatment: ENIG
PCBA Lead tim]]></description><pubDate><![CDATA[20250401]]></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[boardPCBA
Material
FR-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, comp]]></description><pubDate><![CDATA[20240914]]></pubDate></item>
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<title><![CDATA[Aluminum Printed Circuit Board]]></title><link><![CDATA[https://pcbmain68.en.ec21.com/Aluminum-Printed-Circuit-Board--11046819_11248728.html]]></link><description><![CDATA[Aluminum PCB
Advanced Circuits Specification
Aluminum Printed Circuit Boards 
Contain a Thin Layer of Thermally Conductive Dielectric Material that Transfers Heat.
There are many names for these prod]]></description><pubDate><![CDATA[20240606]]></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 exceeding 4 oz, with some designs reaching up to 20 oz or more.
The primary purpose of heavy copper PCBs is to enhance the board&apos;s ability to carry high currents and withstand elevated tempera]]></description><pubDate><![CDATA[20240512]]></pubDate></item>
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<title><![CDATA[Non-Woven Fabric Manufacturing Machine Control Board PCBA Electronics]]></title><link><![CDATA[https://grandepcba.en.ec21.com/Non-Woven-Fabric-Manufacturing-Machine--11194245_11194256.html]]></link><description><![CDATA[Supplier: Shenzhen Grande ElectronicsLayers: 4Application:Non-Woven Fabric Manufacturing Machine Control Board PCBA ElectronicsPCB: FR-4/1.6mm, 1ozSurface Treatment: ENIGPCBA Lead time: 3-4 weeksPack]]></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[Boards/class 2
IPC6016- Qualification and Performance Specification for High Density Interconnect(HDI) Layers or Boards/ class 2
IPC-SM-840 Qualification and Performance of permanent polymer coatings]]></description><pubDate><![CDATA[20240229]]></pubDate></item>
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<title><![CDATA[Good Working PCBA  for Electronics]]></title><link><![CDATA[https://finest202104.en.ec21.com/Good-Working-PCBA-for--11370329_11384176.html]]></link><description><![CDATA[Item
PCB Capability
Laminate materials 
FR4,High TG FR4, Hign Frequency, Alum, FPC
Board Thickness
0.3mm-5.0mm, Flex 0.1-0.25mm
Thickness Tolerance
+-10%
Number of layers
1-22L
Min Line Width/space
4]]></description><pubDate><![CDATA[20230519]]></pubDate></item>
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<title><![CDATA[High Precision Smt 12 Layers Pcba]]></title><link><![CDATA[https://cttpcb.en.ec21.com/High-Precision-Smt-12-Layers--10919275_11050456.html]]></link><description><![CDATA[layers pcba
High precision PCBA
, 12 layers pcba
4 YAMAHA High-speed SMT Lines
● 6 million daily SMT placements capability
● 400,000 daily DIP placements capability
● 500×600 mm Maximum Board ]]></description><pubDate><![CDATA[20231206]]></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[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[Loudspeaker PCB]]></title><link><![CDATA[https://techighpcb.en.ec21.com/Loudspeaker-PCB--11812588_11812591.html]]></link><description><![CDATA[boards, resin plug-hole boards, and half-hole craft boards, bonding craft boards, buried copper blocks, etc.Now key parameters of our company processed products are as follows:
Layer
4L
Copper thickn]]></description><pubDate><![CDATA[20230628]]></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[Golden Triangle Flex PCB Capabilities]]></title><link><![CDATA[https://gtpcba.en.ec21.com/Golden-Triangle-Flex-PCB-Capabilities--11805203_11836254.html]]></link><description><![CDATA[layers are etched with a chemical or mechanical process to remove the unwanted copper, leaving the desired circuitry pattern. Finally, a solder mask is applied to the board and the components are sol]]></description><pubDate><![CDATA[20230821]]></pubDate></item>
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<title><![CDATA[Red Soldermask Industry Control Electronics PCB Assembly]]></title><link><![CDATA[https://ucreatepcb123.en.ec21.com/Red-Soldermask-Industry-Control-Electronics--11761239_11786592.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[20230510]]></pubDate></item>
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<title><![CDATA[Banding Machine Pcba Housing Pcba Service Electronic Assembly Shenzhen PCBA Factory]]></title><link><![CDATA[https://440183199803063144.en.ec21.com/Banding-Machine-Pcba-Housing-Pcba--11408756_11473657.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[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[Board TypeSingle-sided, Double-sided, Multi-layerCopper Thickness1/2oz, 1oz, 2oz, 3oz, 4ozMaterialFR-4, FR-1, CEM-1, CEM-3, AluminumLead Time2-3 WeeksSolder Mask ColorGreen, Blue, White, Black, Red, ]]></description><pubDate><![CDATA[20240112]]></pubDate></item>
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<title><![CDATA[ODM Gold Finger PCB Board Fabrication High TG FR4 PCBA for Industrial Field]]></title><link><![CDATA[https://pcbboardfabrication.en.ec21.com/ODM-Gold-Finger-PCB-Board--11776872_11776873.html]]></link><description><![CDATA[PRODUCT DESCRIPTION
ODM Gold Finger High TG FR4 Multi-Layer PCB Board Fabrication for Industrial Field
Quick details:
Base Material: IT-170 GRA1
Copper Thickness: 2 oz
Board Thickness: 1.6 mm
Min. Ho]]></description><pubDate><![CDATA[20230426]]></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[Flexible PCB]]></title><link><![CDATA[https://tendtronic.en.ec21.com/Flexible-PCB--9385605_9497811.html]]></link><description><![CDATA[Boards (PCB,FPC), Single-Sided PCB,PTH Double-Sided PCB,NPTH Double-Sided PCB,Flexible PCB(FPC),Multilayer PCB(1~20 Layers)for worldwide customers. with more than ten years of specialized experience ]]></description><pubDate><![CDATA[20150505]]></pubDate></item>

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