Four bare-board examples, with different thermal and electrical questions.
The FineCircuit website also presents the name Hu Nan HYJPCB Co., Ltd and the HYJ PCB brand. Its catalogue covers aluminium and copper-related boards alongside FR-4 and CEM-1 circuits. The useful starting point is the individual construction: a copper-related power board, an aluminium lighting panel, a CEM-1 switch controller or a thin FR-4 strip. A metal-related product title is not enough to define the stack.
These are bare PCB catalogue examples. The site’s navigation contains “PCB assembly” paths, but the reviewed equipment and capabilities pages do not identify an installed assembly line or its limits. Assembly, component sourcing and functional testing require a separate agreed scope.
POWER PATH / COPPER IS NOT THE WHOLE STACK
Distinguish FR-4 with copper from an aluminium-base lighting board.
Original photograph attached to this individual manufacturer product page; no geometry inferred from the photograph.
FR-4 with copper power-control board
Material stated
FR-4 with copper
Board thickness
3.0 mm
Copper thickness
3 oz
Mask / legend
Blue / white
Application
New-energy vehicle / charging power control
Layer count / finish
Not specified in this detail
Ask for a sectioned construction showing the copper and FR-4 relationship. Define current paths, dielectric isolation, terminal interface and temperature-rise acceptance. The copper-core title alone does not establish a metal-base stack or automotive qualification.
What “copper core” leaves unanswered
The power-control page sits in the copper-core catalogue, but its detail table says “FR4 With Copper,” 3.0 mm and 3 oz. It does not identify a layer count, copper-inlay method, dielectric arrangement or surface finish. Ask for the cross-section and fabrication drawing. A charging-station application label does not establish vehicle programme approval, insulation performance or a validated current rating.
Original photograph attached to this individual manufacturer product page; no geometry inferred from the photograph.
Aluminium-base LED street-lamp board
Base
Aluminium
Board thickness
1.5 mm
Copper thickness
1 oz
Thermal conductivity
Customisation; no numeric rating
Finish options
Lead-free HASL / OSP
Mask / legend
Customisation; source lists black, white or green mask
Provide the dielectric grade and thickness, isolation voltage and thermal measurement method. Agree luminaire mounting, outline and flatness. Neither the thermal rating nor layer count is assigned from the panel photograph.
The LED thermal specification should travel with the drawing.
Material: name the dielectric grade and thickness between copper and aluminium, with the base-alloy specification.
Thermal test: state the conductivity method and conditions, then agree the finished-board thermal resistance relevant to the luminaire.
Isolation: release dielectric withstand, creepage and clearance requirements for the actual operating voltage.
Mounting: define hole positions, outline, flatness, burr acceptance and heat-spreader contact. The gallery panel does not specify the delivered outline.
The product’s thermal-conductivity field says “Customisation”; it gives no W/m·K value. Its 1.5 mm board thickness and 1 oz copper are individual catalogue values, not a confirmed thermal rating.
SINGLE-SIDED / CLEAR THE MATERIAL AND THICKNESS CONFLICTS
Use the detail table to open a precise drawing review.
Original photograph attached to this individual manufacturer product page; no geometry inferred from the photograph.
Single-sided CEM-1 switch-controller PCB
Construction
Single-sided CEM-1
Material notation
KB / SY / ILM CEM-1; grade not stated
Thickness conflict
Heading: 2.0 mm; detail: 1.6 mm
Copper arrangement
2/0 oz
Finish options
OSP / lead-free HASL
Mask / legend
Green / white
Resolve 2.0 versus 1.6 mm on the released drawing. Specify the CEM-1 grade, delivered thickness tolerance, contact solderability and circuit isolation; the pictured controller is a bare board, not a supplied assembly.
The switch-controller title and text say 2.0 mm, while the detailed thickness field says 1.6 mm. Both are preserved as a conflict; neither is assigned as the agreed order thickness. The source identifies a single-sided CEM-1 construction and 2/0 oz copper. Specify which finish is required rather than assuming OSP and lead-free HASL are interchangeable.
Original photograph attached to this individual manufacturer product page; no geometry inferred from the photograph.
Thin FR-4 signal-generator strip
Catalogue family
Single-sided PCB
Detail material
KB / SY / ILM FR-4; grade not stated
Board thickness
0.6 mm
Copper notation
H/0 oz; confirm the H definition
Finish
OSP
Mask / legend
Source says “Whitout” for both
Confirm FR-4 despite the title containing CEM-1 and aluminium. Ask what H/0 oz means on the released copper specification, whether mask and legend are absent, and how the narrow strip is supplied and handled.
The signal-strip title contains FR-4, CEM-1 and aluminium, but its detailed material field explicitly names FR-4. The source places it in the single-sided family. “H/0 oz” and the “Whitout” mask/legend wording need confirmation in the manufacturing instruction. A narrow photograph does not supply an outline tolerance, connector plating specification or handling requirement.
PROCESS TABLE / NOT AN INDIVIDUAL BOARD QUALIFICATION
Keep the general limits separate from the four product examples.
A repeated process table on the product pages lists the following manufacturer-reported values. It is not separated by material, batch size or producing line, and does not show that all limits are achievable together. Use it to prepare questions; release your actual combination for engineering confirmation.
Layer range
1–20
Board thickness
0.2–6.0 mm
Copper range
0.5–12 oz
Minimum line / space
0.08 / 0.08 mm
Minimum finished hole
0.25 mm — explicitly described as finished
Plating aspect ratio
<8:1
Working size
520 × 620 mm; accompanying inch values are inconsistent
Minimum four-layer thickness
0.4 mm
Minimum six-layer thickness
0.6 mm
Minimum HAL-finish thickness
0.4 mm
Differential impedance row
±10%
General impedance-control row
±5%; target and measurement definition require agreement
The table’s 520 × 620 mm working size is paired with 21.25 × 24.5 inches, which is not an exact conversion. Request the usable panel and margins in the unit specified on your drawing. Its ±5% general impedance row and ±10% differential row also need separate target, coupon and test definitions; neither tolerance is attached to the four pictured examples.
Published finish options include lead-free HASL, immersion gold, tin and silver, plated gold and OSP. Material-family names and finish availability do not establish the laminate grade, lot traceability, plating thickness or qualification of a particular construction.
YIYANG / IDENTIFY THE CONTRACTING AND PRODUCING PARTY
One published contact address; several names to reconcile.
Published factory contact
The official contact page gives 2F, Electronic Industrial Park, Changchun East Road, Ziyang District, Yiyang, Hunan, for both company and factory. It lists telephone +86 737 3104748 and fax +86 737 3104708. The company introduction says the business was established in Hunan in 2012; this is the website’s history, not an independently checked incorporation date.
Identity on the purchase order
This directory record is 湖南好易佳电路板股份有限公司. The site uses FineCircuit and HYJPCB, and its historical waste-transfer sheets name 湖南好易佳电路板有限公司. Obtain the current legal registration, bank beneficiary and producing-site relationship before contracting. The historical name is not silently treated as proof of a legal-name change.
Ask which process steps are performed at the named site and which are subcontracted. The reviewed “Equipment” page contains no machine list or production-line evidence; no laser drill, LDI, assembly line or installed capacity is assigned here. Published prices, urgent schedules and monthly supply claims are not treated as current quotations or available capacity.
DOCUMENT TYPE / WASTE RECORDS ARE NOT PCB CERTIFICATES
Match the requested qualification to the actual document.
The quality page’s “PCB Certifications” section links two Hunan solid/hazardous-waste transfer summaries, for January–December 2022 and January–November 2023. These show historical waste movements for 湖南好易佳电路板有限公司. They are not ISO 9001 certificates, UL recognition records, environmental-compliance clearance or PCB product-test reports.
The generic process table says “RoHS, ISO9001, UL (in certification).” That last phrase does not establish a recognised UL file. Request the current certificate or listing, exact holder, site, construction scope and validity from the applicable issuer. Product-title claims alone do not become certification badges.
The quality page also publishes etch/final-test yield and sampling-defect figures. Without a period, sample population and inspection reports, they remain manufacturer statements rather than verified delivered-lot results. Agree the electrical-test coverage, dimensional inspection, material records and lot report for your order.
RFQ / MAKE THE UNRESOLVED ITEMS ACTIONABLE
Send the construction and acceptance requirements together.
Power control: FR-4/copper section, finished copper, current path, terminal geometry, isolation and temperature-rise conditions.
LED substrate: dielectric grade and thickness, thermal test method, insulation voltage, mounting and flatness.
CEM-1 controller: resolve 2.0/1.6 mm, specify laminate grade, copper, finish and delivered outline.
Thin FR-4 strip: clarify H/0 oz, mask and legend, panel separation, handling and contact acceptance.
All routes: revision-controlled Gerber/drill/netlist and stack, producing legal entity, applicable qualification, inspection deliverables and change approval.
Reviewed 9 October 2026 against individual official pages and their original photographs. General process values are kept separate from board-specific parameters. Independent current entity/qualification records remain a research gap.
SOURCE TRAIL
Sources behind this profile
Reviewed 9 October 2026. Original product photos and detail tables underpin these constructions. Waste-transfer documents and manufacturer quality statements are not current issuer verification. Government search leads whose relevant original records could not be read are excluded from the public evidence list.
