What performance requirements do electronic product labels need? 4 Core Aspects + 9 Tests + Selection Decision

Last week, a client who manufactures PCB boards asked me: "My electronic labels stick onto the circuit boards, and they get smeared after reflow soldering—what should I do?"

I said: "The issue is not with the label, but with the material selection—reflow soldering at 150℃ × 90 seconds requires PI + silicone, whereas coated paper smears at 80℃."

I said: "Four core performance criteria must be met—anti-static + chemical resistance + tear resistance + high-temperature resistance. This article does not discuss 'what is an electronic label'—it covers the 4 key performance requirements + 9 testing methods + 5 selection categories + 3 electronic application scenario comparisons."

Detailed Explanation of 4 Core Performance Properties

Property 1: Anti-Static (ESD)

3 Key Indicators:

• Surface Resistance: 10^6–10^9 Ω (static dissipation)
• Friction Voltage: < 100V (anti-triboelectric charging)
• Decay Time: < 2 seconds (rapid discharge)

3 Electronic Scenarios:

• Consumer Electronics (mobile phones / computers) — basic anti-static
• Industrial Electronics (controllers / instruments) — medium anti-static
• PCB / Semiconductor — high anti-static (required)

Property 2: Chemical Resistance

3 Chemical Types That Must Be Resisted:

• Alcohol (isopropyl alcohol / ethanol) — cleaning agent wiping
• Acetone (strong solvent) — production wiping
• Flux (rosin / solder paste) — PCB soldering

3 Testing Methods:

• Immersion (no peeling after 30 minutes)
• Wiping (no wear after 100 rubs)
• Contact (no discoloration after 24 hours)

Property 3: Tear Resistance

3 Indicators:

• Tensile Strength: ≥ 50 N/cm
• Tear Strength: ≥ 30 N/cm
• Fold Endurance: 10,000 folds

3 Material Comparisons:

• Coated Paper 20 N/cm (weak)
• Synthetic Paper 40 N/cm (medium)
• PET 80 N/cm (strong)

Property 4: High-Temperature Resistance

3 Temperature Scenario Tiers:

• Conventional Electronics: 80–100°C (housing)
• PCB Process: 150–260°C (reflow soldering + wave soldering)
• Extreme High Temperature: 300–500°C (semiconductors)

3 Material Temperature Resistance Ratings:

• Coated Paper 80°C (not resistant)
• Synthetic Paper PP 100°C (average)
• PET 150°C (medium resistance)
• PI 300°C (extremely high resistance)

9 Test Methods

Test 1: Surface Resistance

3-Step Procedure:

• Zero the resistance meter
• Place the probes 1 cm apart on the label surface
• Read the value (acceptable range: 10^6-10^9 Ω)

Test 2: Friction Voltage

3-Step Procedure:

• Rub the label 10 times with a cloth
• Make contact with the electrometer
• Read the value (acceptable: < 100V)

Test 3: Decay Time

3-Step Procedure:

• Charge the static decay meter to 1000V
• Bring it into contact with the label
• Measure the time to decay to 100V (acceptable: < 2 seconds)

Test 4: Alcohol Immersion

3-Step Procedure:

• Immerse the label in alcohol for 30 minutes
• Check for peeling or discoloration
• Acceptance criteria: no peeling + clear text

Test 5: Acetone Rub

3-Step Procedure:

• Dip an alcohol swab in acetone
• Rub 100 times
• Text remains legible and does not peel off

Test 6: Flux Contact

3-Step Procedure:

• Apply the label to a PCB
• Apply flux
• Inspect after 24 hours

Test 7: Tensile Strength

3-Step Procedure:

• Clamp the label in a tensile testing machine
• Pull slowly (10 mm/min)
• Read the maximum force (acceptable: ≥ 50 N/cm)

Test 8: Crease Resistance

3-Step Procedure:

• Fold the label 10,000 times
• Check for tearing
• Acceptance criteria: no tearing after 10,000 folds

Test 9: High-Temperature Resistance

3-Step Procedure:

• Place in a 150℃ oven for 30 minutes
• Check for deformation or peeling
• Acceptance criteria: no deformation + clear text

5 Selection Decision Categories

Selection 1: Consumer Electronics (Mobile Phones / Computers)

4 Major Performance Requirements:

• Anti-static: 6 / 10
• Chemical resistance: 5 / 10
• Tear resistance: 5 / 10
• High-temperature resistance: 3 / 10 (room temperature)

Recommendation: Coated paper + permanent acrylic + matte film (cost 0.3-0.5 yuan)

Selection 2: Industrial Electronics (Controllers)

4 Major Performance Requirements:

• Anti-static: 8 / 10
• Chemical resistance: 8 / 10
• Tear resistance: 8 / 10
• High-temperature resistance: 7 / 10 (150℃)

Recommendation: PET + modified acrylic + matte film (cost 0.5-1 yuan)

Selection 3: PCB Boards (Circuit Boards)

4 Major Performance Requirements:

• Anti-static: 9 / 10
• Chemical resistance: 10 / 10
• Tear resistance: 9 / 10
• High-temperature resistance: 10 / 10 (260℃)

Recommendation: PI + silicone (cost 1-3 yuan)

Selection 4: Semiconductor Wafers

4 Major Performance Requirements:

• Anti-static: 10 / 10 (extremely strict)
• Chemical resistance: 10 / 10 (strong acids and alkalis)
• Tear resistance: 10 / 10
• High-temperature resistance: 10 / 10 (300℃)

Recommendation: PI + specialty silicone (cost 3-5 yuan)

Selection 5: Battery Labels

4 Major Performance Requirements:

• Anti-static: 8 / 10 (batteries are flammable)
• Chemical resistance: 9 / 10 (electrolyte)
• Tear resistance: 7 / 10
• High-temperature resistance: 8 / 10 (battery heat generation)

Recommendation: PET + flame-retardant adhesive (cost 0.5-1 yuan)

3 Electronic Scenario Comparison

Scenario 1: Phone Back Cover Label

Requirement: Basic anti-counterfeiting + serial number

Recommendation: Coated paper + permanent acrylic + matte film

Feature: Low cost + simple process

Scenario 2: PCB Traceability

Requirement: Reflow soldering + anti-static + serial number

Recommendation: PET + modified acrylic

Feature: Medium cost + medium performance

Scenario 3: Automotive ECU Label

Requirement: Long-term 150℃ resistance + chemical resistance + high adhesion

Recommendation: PI + silicone

Feature: High cost + extreme performance

3 Common Selection Mistakes

Mistake 1: Choosing the Cheapest Option

Symptom: Using coated paper labels on PCBs → reflow soldering smear

Consequence: Labels fall off + re-production required

Solution: Select materials based on the scenario + verify through testing

Mistake 2: Only Checking Heat Resistance, Not Chemical Resistance

Symptom: PET withstands 150℃ but offers no resistance to flux

Consequence: Text becomes blurry after PCB soldering

Solution: Test all 4 key performance properties

Mistake 3: Skipping Testing

Symptom: Going directly to mass production + launch

Consequence: Problems occur + product recall

Solution: Run the 9 mandatory tests for every supplier

If you want to learn about PCB labels — refer to medical device labels, or directly contact a LeXiang Packaging consultant, and receive your electronics product label solution + test report within 24 hours.