.jpg&w=3840&q=75)
Electronic Scrap
Class 1-A High-Grade PCBs
Grade: VariousVery High Tier
Pre-2000 computer motherboards with visible gold plating, chips
Market Price EstimateUpdated Daily
$3,250/ MT
+225 (7.4%)vs yesterday
Verified specifications & market data
Chemical Composition
Elemental breakdown by percentage weight.
Standard composition limits
Values represent maximum allowed percentage unless otherwise noted.
Physical Properties
Material form, density, and contamination specifications.
Pre-2000 computer motherboards and circuit boards; vintage/legacy computer e-waste; high precious metal content (0.05-0.30g gold per board; 50-90g copper); thicker gold plating than modern boards (pre-RoHS era); significant lead solder content (5-40g per board); established e-waste recovery infrastructure; premium price tier; limited but valuable supply; Class 1-A grading reflects highest e-waste precious metal concentration
Acceptable Inclusions
- Gold plating 0.05-0.30g (high-grade specification)
- Copper 50-90g (base metal; valuable)
- Tin-lead solder 10-50g (pre-2000 standard; contains lead)
- Silver <5g (precious metal trace)
- Palladium trace (if present; ultra-valuable)
- Nickel <5g (plating component)
- Epoxy-fiberglass substrate (inert)
- Visible age/oxidation (vintage characteristic)
Prohibited Materials
- Gold <0.05g per board (below high-grade specification)
- Modern post-2000 boards (not high-grade)
- Batteries attached (active hazmat)
- Mercury switches or mercury components (hazmat extreme)
- Severely degraded boards (no recovery value)
- Unknown composition or age
Quality Assurance
Testing protocols, sampling methods, and acceptance criteria.
Sampling Protocol
frequencyStratified random sampling by board type; verify pre-2000 era ; gold plating verification; hazmat lead screening
maximumQuantity200+ boards per shipment
minimumQuantity20-100 boards or 5-20 kg
percentage5-15% of lot
stratificationSample across board types; computer generations; age authentication ; composition variable by era;
Acceptance Limits
all Criteria Must PassMaterial be pre-2000 high-grade Class 1-A with 0.05-0.30g thick gold per board; tin-lead solder ; structural integrity ; vintage authentication
board IntegrityMotherboard or high-value vintage card ; traces/components largely intact; processing economical
class One A StatusClass 1-A premium specification ; vintage pre-2000 authentication ; scarcity premium
gold PlatingGold plating 0.05-0.30g per board confirmed; pre-2000 characteristic ; visible on connector fingers/traces
pre Vintage AuthenticationPre-2000 vintage ; / slot design ; 486/Pentium component generation ; board manufacturing era established
tin Lead SolderTin-lead solder composition ; lead content 5-40g per board quantified; hazmat processing protocol
Weight Tolerance
measurementVerified by certified scale; weight accountability for ultra-premium vintage material; precious metal weight critical for pricing
variance±8% from expected weight
Required Test Methods
Visual Inspection & Pre-2000 Vintage Authentication
CRITICALMANDATORY
Purpose
- confirm pre-2000 motherboard characteristic (ISA/PCI era
- 486/Pentium component generation
- board design distinctive)
- verify visible thick gold on connector fingers/traces
- assess condition/age
Acceptance Criteria
- Pre-2000 motherboard characteristic unmistakably evident
- ISA/PCI slot design
- vintage component styles
- visible gold characteristic
Procedure
- 100% visual inspection
- identify ISA/PCI slot architecture (critical pre-2000 indicator)
- assess component package types (DIP/PLCC/BGA characteristic by era)
- verify visible yellow/gold color on connectors/fingers (thick pre-2000 characteristic)
- assess physical age (dust patterns, component obsolescence styles, manufacturing style)
Pre-2000 Board Type & Generation Classification
CRITICAL
Purpose
- classify board type (motherboard, graphics card, memory)
- determine computer generation (486, Pentium, Pentium Pro)
- authenticate vintage era
- justify scarcity premium
Acceptance Criteria
- Board type identified
- generation confirmed
- pre-2000 characteristic evident
- vintage authentication
Procedure
- Visual board identification
- ISA/PCI slot presence
- component style assessment (486 DIP vs. Pentium PLCC vs. Pro FCPGA)
- CPU socket type identification (Socket 5, Socket 7, Slot 1 characteristic by era)
- manufacturing date if visible on board
- component soldering style assessment (lead solder dull gray vs. modern lead-free)
Thick Gold Plating Verification
CRITICAL
Purpose
- verify pre-2000 THICK gold plating characteristic (0.05-0.30g per board
- 5-6× modern thickness
- Class 1-A premium specification)
- estimate gold recovery yield
Acceptance Criteria
- Gold plating confirmed 0.05-0.30g range per board
- thickness VISIBLY THICK vs. modern boards
- characteristic pre-2000
Procedure
- Visual gold color assessment (bright yellow characteristic pre-2000)
- XRF surface gold spectrometry
- fire assay confirmation (total gold per board quantified)
- plating thickness estimation (pre-2000 characteristic obvious
- thick layer visible)
Tin-Lead Solder Assessment
CRITICAL
Purpose
- verify tin-lead solder composition (NOT lead-free
- pre-2000 standard characteristic)
- quantify lead content 5-40g per board
- assess hazmat processing requirement
Acceptance Criteria
- Tin-lead solder confirmed (dull gray appearance characteristic pre-2000)
- lead content 5-40g per board quantified
- pre-2000 standard
- hazmat protocol appropriate
Procedure
- Visual solder assessment (dull gray appearance = lead solder characteristic
- shiny = modern lead-free
- distinctive visual)
- XRF lead quantification
- solder joint appearance analysis
- component count estimation for total solder mass
Hazmat Lead Screening
CRITICAL
Purpose
- quantify lead >0.1% (RoHS comparison
- pre-2000 boards EXCEED massively)
- assess cadmium/mercury (legacy concern)
- establish hazmat processing protocol
Acceptance Criteria
- Lead content quantified (>0.1% expected pre-2000
- high lead solder CONFIRMED)
- cadmium <0.01% assessed
- mercury <0.001% confirmed (mercury switches rare but verified absent)
Copper Content Estimation
Purpose
- Estimate copper content 50-90g per board
- quantify base metal value
- validate commodity basis
Acceptance Criteria
- Copper 50-90g range confirmed per board
- copper traces/vias visible
- base metal value
Procedure
- Visual copper assessment
- weight estimation
- XRF metal quantification
- trace density assessment
Precious Metal Trace Detection
Purpose
- Detect silver, palladium trace in components/solder
- assess additional precious metal value
- potentially ultra-valuable specialty components
Acceptance Criteria
- Silver/palladium documented if present
- trace components identified
- secondary precious value
Procedure
- XRF spectrometry precious metal detection
- identify specialty components (voltage regulators, rare capacitors)
- palladium if present (ultra-precious)
Board Condition & Recovery Assessment
Purpose
- Evaluate board structural integrity
- assess trace/pad degradation
- determine processing feasibility and precious metal loss risk
Acceptance Criteria
- Board structure sound
- traces/pads largely intact
- processing economical
- vintage condition acceptable
Procedure
- Visual structural assessment
- identify corrosion/oxidation level
- trace continuity assessment
- via integrity check