A Material Platform Built to Print, Stretch, and Shield: Inside ChemWhat's Conductive Paste for Circuit and Shielding Portfolio
Why Printed Conductive Materials Matter Now
Smartphone antennas, automotive defrosting circuits on panoramic glass roofs, wearable ECG electrodes, and EMI shielding layers inside telecom base stations all rely on the same underlying category of material: conductive paste that can be printed, sprayed, or molded onto a surface much like ink. As consumer electronics get thinner and more curved, as vehicles add more sensors and glass surfaces, and as 5G and IoT devices proliferate, traditional copper-etching and metal-stamping approaches increasingly fall short — they are costly, inflexible, and incompatible with curved housings, stretchable substrates, or ultra-fine circuit geometries. This is precisely the gap that ChemWhat's two core product lines are built to close: conductive pastes for circuit and shielding.
Conductive Pastes for Circuit: 18 Product Categories Across the Printed Electronics Landscape
ChemWhat's conductive circuit paste line spans roughly 18 sub-categories, formulated to match specific substrates (PET, ITO, PC, PC/GF, PA, PPS, TPU, glass, ceramic, silicon, PEEK, PI, and nano-silver films), curing profiles (low-temperature cure at 80–90°C, fast cure around 135°C, or sintering-type systems), and application processes (screen printing, pad printing, transfer printing, spraying, and laser etching).
- Antenna feed-point and ultrasonic module pastes: designed for direct printing on curved phone housings; cure at 80–90°C; withstand 5,000+ abrasion cycles; retain ≥4B adhesion after 1,000+ hours of 85°C/85% RH aging, plus temperature cycling (+80°C/500h, –40°C/500–1,200h) and salt-spray exposure (5% NaCl, 35°C, 72h).
- Printed FPC and touch-sensor pastes: standard screen printing achieves 60 μm line width/spacing; combined with laser etching, sub-30 μm fine lines are achievable — supporting the increasingly dense routing needs of laptops, tablets, and smartphone touch panels.
- Stretchable conductive silver paste: engineered for wearables, automotive panoramic roofs, and medical electrode patches; withstands 2,000+ stretch cycles at 30% elongation while maintaining stable resistance and adhesion, so ECG electrodes and roof-glass defrosting circuits survive repeated flexing without opening the circuit.
- Automotive body-printed and heating-circuit pastes: extend the same flexible-printing platform to interior demisting, defrosting, and seat-heating circuits.
- Lidar module paste: a dedicated formulation for applications where print precision and signal integrity are critical.
- Solderable low-temperature paste: bridges printed conductive circuits with conventional soldering processes for hybrid assembly workflows.
- Low-temperature sintered antenna paste: forms a dense, low-resistance conductive layer at reduced sintering temperatures, suited to mobile phone and telecom antenna applications requiring tight resistance consistency.
- Nanoimprint silver paste, PEDOT:PSS transparent conductive ink, and transparent antenna paste: enable metal-mesh and transparent-electrode structures that preserve high optical transparency while providing a conductive path — used in transparent antennas and touch-sensor electrodes.
- Capacitor/resistor termination paste and inductor paste: support passive-component manufacturing, providing conductive termination at component electrode ends.
- Smart-sensing silver paste: used to print electrodes for pressure and temperature sensors in wearable and IoT devices.
Sheet resistance across the line ranges from roughly 4 mΩ/□/mil for low-temperature sintered antenna paste to around 30 mΩ/□/mil for general-purpose formulations, allowing selection based on target circuit resistance. Collectively, these categories cover the dominant printed-conductive-material use cases across consumer electronics, automotive electronics, medical electronics, and IoT devices.
Conductive Pastes for Shielding: Protecting Signal Integrity at the Seam
Every electronic enclosure has seams and connector interfaces that need EMI shielding — without it, phone signals interfere with one another and automotive electronic systems can misbehave. ChemWhat's shielding materials fall into three groups:
- Shielding pastes (silver, silver-aluminum, silver-copper, and nickel-carbon): sprayed directly onto the interior wall of an enclosure to form a shielding layer, achieving shielding effectiveness (per MIL-DTL-83528C / MIL-STD-285) of up to 110 dB across the 0.3–20 GHz band, with material-specific ranges from roughly 65 dB to 120+ dB depending on conductive-layer chemistry and shielding grade required.
- Conductive shielding gaskets and elastomeric conductive connectors: a high-resilience silicone core with an outer conductive layer (silver, aluminum-silver, glass-silver, nickel-silver, or nickel-carbon, selectable by application) that seals while shielding. These operate across –55°C to 160°C (per ASTM D1329), show compression set below 10–12% (per ASTM D395), and survive 25,000 compression cycles without cracking or delamination; surface and volume resistivity remain stable after 1,000 hours of 100°C dry-heat aging and 1,000 hours of 85°C/85% RH humid aging.
- FIP (Form-in-Place) nickel-carbon gasket adhesive: extends shielding coverage into tighter, more intricate geometries where a pre-formed gasket isn't practical.
Environmental and safety compliance across the shielding line includes UL 94 HB flame-retardant rating, RoHS conformance (per IEC 62321), halogen-free performance (per BS EN 14582), and Grade 0 mold-resistance per GB/T 2423.16 — supporting deployment in 5G base stations, aerospace equipment, rail transit systems, and electric vehicles, all of which demand long-term environmental reliability.
Two Proprietary Technologies Behind the Performance
Delivering fine-line print resolution, stretchability, shielding effectiveness, and durability under repeated mechanical stress simultaneously depends on two technology platforms:
- Flexible printing technology — high-precision printing and laser direct-writing that achieve micron-scale (and in some formulations, sub-micron) conductive pattern formation, balancing resolution with production throughput.
- Elastic shielding technology — purpose-built to preserve the electrical and mechanical reliability of flexible, stretchable conductive materials after repeated deformation, a capability validated through the compression-cycle and thermal-aging testing referenced above.
Why ChemWhat
ChemWhat offers both the breadth of formulation options and the depth of validated reliability data that sourcing and engineering teams need to evaluate a materials partner. The company further supports fast delivery, responsive technical service, and custom formulation development based on a customer's specific substrate, process window, and reliability requirements. For organizations currently sourcing conductive circuit or shielding materials for consumer electronics, wearables, automotive electronics, 5G infrastructure, or aerospace applications, ChemWhat's technical team is available to discuss requirements directly and arrange sample evaluation.
Product Index
ChemWhat Conductive Circuit & Shielding Paste Product Index (click a row to jump to full specifications)
Application DirectionProduct CodeOverview
Ultrasonic Module PasteWI-TL50S-A / WI-600AA RoHS-compliant, general-purpose low-temperature-curing conductive silver paste designed for multi-layer printing on PET, ITO, and...PDS Antenna PasteWI-TL600A / WI-TL600AB / WI-TL600B / WI-TL600B7A family of RoHS-compliant PDS (printed direct structuring) circuit / antenna feed-point silver pastes, including a solvent-free...Printed FPC Paste (Laptop/Notebook)WI-TL50B / WI-TL50D10 / WI-TL50D11E / WI-TL50SA series of RoHS-compliant, general-purpose low-temperature-curing conductive silver pastes formulated for fine-line printing on...Stretchable Conductive PasteWI-ST80S / WI-ST80V / WI-ST80B / WI-ST70A / WI-ST70B3 (WI-ST80 series)A RoHS-compliant stretchable conductive silver paste series using highly flexible resin as the binder phase and fine/flake silver powder...Lidar Module PasteWI-TL20E4CA RoHS-compliant conductive silver paste specifically formulated for lidar module applications, offering good printability suited to the...Medical Electrode PasteWI-ST80A2C3A RoHS-compliant flexible-circuit-printing conductive silver paste suited to wearable devices and medical electrode patches, using an...Automotive Body-Printed PasteWI-ST80V02A RoHS-compliant fast-curing conductive silver paste for flexible circuit printing, suited to printing on a variety of flexible...Automotive Panoramic-Roof Defrosting PasteWI-ST80C / WI-ST80B (WI-ST80 series)Part of the same RoHS-compliant flexible-circuit-printing silver paste platform used to print defrosting/demisting heater circuits...Touch Sensor PasteWI-TL20E3 / WI-TL20EA / WI-TL30A / WI-ST70AA family of RoHS-compliant ultra-fine-line, laser-etching-compatible conductive silver pastes (and a dedicated resistive-touch-screen...Heating Circuit PasteWI-ST80C2A RoHS-compliant flexible-circuit-printing conductive silver paste specifically suited to printing conductive heating circuits for...Solderable Low-Temperature PasteWI-TL60S2A RoHS-compliant general-purpose conductive silver paste offering both good fine-line printability and solderability, enabling...Sintered Antenna PasteWI-INK135S2 / WI-INK135S29C / WI-INK135S29D / WI-INK135SG9A RoHS-compliant low-temperature sintered antenna silver paste series suited to a variety of communication devices and mobile terminal...Nanoimprint Silver PasteWI-INK135S29DA nano conductive silver paste purpose-built for metal-mesh technology applications, offering excellent filling capability, thixotropy,...PEDOT Transparent Conductive InkPD-101A screen-printable transparent conductive ink based on the conductive polymer PEDOT:PSS, formulated with a suitable thickener to raise...Transparent Antenna PasteWI-INK135S29CA nano conductive silver paste purpose-built for metal-mesh technology applications used in transparent antenna structures, offering...Capacitor/Resistor Termination PasteWI-ST60S1 / WI-ST60S11EFA family of RoHS- and REACH-compliant conductive silver pastes for capacitor and resistor component end-termination protection, using a...Inductor PasteWI-ST60SA RoHS-compliant fine-line screen-printing conductive silver paste on the WI-ST60 platform, capable of printing line width/spacing down...Smart Sensing Paste (Smart Wearable Paste)WI-ST80R1A RoHS-compliant conductive silver paste developed for electromagnetic-shielding sealing equipment and smart wearable/sensing...Conductive Shielding Paste (Ag / Ag-Al / Ag-Cu / Ni-C)WI-ST219S / WI-ST201S / WI-ST201SP / WI-ST203 / WI-ST201A / WI-YL18 / WI-ST201ALA family of RoHS-compliant EMI shielding pastes (silver, silver-aluminum, and nickel-carbon chemistries) applied via screen printing,...Conductive Shielding Gasket & Elastomeric Conductive ConnectorWI-SL2012 / WI-SL2022 / WI-SL2031 / Elastomeric Conductive ConnectorA silicone-core, silver- or nickel-carbon-coated elastomer product line (dual-color composite shielding gaskets and hollow-cylinder...FIP (Form-in-Place) Nickel-Carbon Gasket AdhesiveWI-NP05 / WI-NP06A two-component, low-temperature-curing conductive adhesive composed primarily of silicone rubber and nickel-coated graphite powder,...
Full Product Specifications
Ultrasonic Module PasteWI-TL50S-A / WI-600A
A RoHS-compliant, general-purpose low-temperature-curing conductive silver paste designed for multi-layer printing on PET, ITO, and glass substrates used in ultrasonic sensor modules. Cures in three sequential printed layers, each optimized for conductivity, adhesion, and hardness.
- Excellent conductivity on PET-Film and ITO-Film
- dense cured film with high surface hardness and strong adhesion
- good chemical and weathering resistance
- stable printing performance with good screen-retention behavior.
Appearance / ColorSilver-gray paste (visual inspection)Viscosity310+/-30 dPa.s (Nissho 2# rotor) / 33,000+/-5,000 cps (Brookfield DV2T, spindle 52#, 5 rpm)Solid Content81+/-2% (burn-off method, tin-foil substrate, 100C/60min)Sheet Resistance / Volume Resistivity=4B per layer (crosscut/3M 681 tape)Hardness>=3H per layer (pencil hardness)Cure ConditionsLayer 1/2/3: 80C/2-4h, 100C/1-2h, 120C/50-90min (hot-air oven); layer thickness 4-6 / 8-12 / 12-18 umPrinting / Process ParametersScreen printing: squeegee angle 60-80deg, depth 1-2mm; print speed 100-300mm/s; print thickness 4-6um; screen 420 mesh polyester; wash solvent ethyl acetate/DBE; inter-pass interval 10-15minReliability & Aging Test Results>=4B adhesion after 85C/85%RH/500h; >=4B after +80C/500h & -40C/500h thermal cycling; >=4B after 5% NaCl/35C/72h salt sprayStorage Conditions & Shelf LifeVacuum-packed; store 0C to -10C, dark, sealed; shelf life 120 days; use within 72h of opening (max 2 reuse cycles if resealed within 72h, else continue at 0~-10C); transport at 0~-10C, max 5 days; warm to room temp (23+/-2C) for 8h before use; stir 5-10min at 30-50rpm (or planetary mixer 1,000rpm/2min)Dilution Ratio & Viscosity DropDiluent ZK-TL50S-A, max 2% of total mass. Viscosity drop: 0.5% -> 50-100 dPa.s; 1.0% -> 100-200; 1.5% -> 150-250; 2.0% -> 200-250
PDS Antenna PasteWI-TL600A / WI-TL600AB / WI-TL600B / WI-TL600B7
A family of RoHS-compliant PDS (printed direct structuring) circuit / antenna feed-point silver pastes, including a solvent-free low-temperature-curing via-hole paste (WI-TL600AB) and high-abrasion, low-temperature-curing antenna feed-point pastes (WI-TL600B/B7) for antennas in communication terminals and mobile devices.
- Excellent conductivity, abrasion resistance, and adhesion after curing
- suited to multiple terminal-device antenna printing processes
- via-hole variant enables reliable through-hole conduction in low-temperature epoxy systems.
Appearance / ColorN/AViscosityN/ASolid ContentN/ASheet Resistance / Volume ResistivityN/AAdhesion>=4B (crosscut/3M610 or CT-24 tape) — WI-600A representative dataHardness>=4H (pencil hardness) — WI-600A representative dataCure ConditionsN/APrinting / Process ParametersN/AReliability & Aging Test ResultsAdhesion >=4B after 85C/85%RH/1,200h high-temp/humidity aging (four-point probe/multimeter)Storage Conditions & Shelf LifeWI-TL600AB: vacuum-packed, store -40C to -20C; 6-month shelf life under these conditionsDilution Ratio & Viscosity DropN/A
Printed FPC Paste (Laptop/Notebook)WI-TL50B / WI-TL50D10 / WI-TL50D11E / WI-TL50S
A series of RoHS-compliant, general-purpose low-temperature-curing conductive silver pastes formulated for fine-line printing on flexible printed circuits (FPC) used in laptops and notebook computers, with good fine-line printability.
- Good fine-line print resolution and pattern definition
- stable print performance across multiple production batches
- compatible with standard screen-printing equipment and processes.
Appearance / ColorN/AViscosityN/ASolid ContentN/ASheet Resistance / Volume ResistivityApprox. 20-30 mOhm/sq/mil (family-typical, four-point probe/multimeter)Adhesion>=4B (family-typical, crosscut tape)HardnessN/ACure ConditionsLow-temperature cure profile, consistent with WI-TL series (typically 80-130C staged cure)Printing / Process ParametersScreen printing down to approx. 60um line width/spacingReliability & Aging Test ResultsN/AStorage Conditions & Shelf LifeStandard series guidance (typical across WI-TL family): vacuum-packed, store 0-10C dark; use within ~1 week of opening; ~6-month shelf life; warm to room temp (23+/-2C) 2h before use; stir 5-10min at 30-50rpmDilution Ratio & Viscosity DropProduct-specific diluent (ZK-series), typically max 2% of total mass (family-typical; specific drop-curve not captured for this code)
Stretchable Conductive PasteWI-ST80S / WI-ST80V / WI-ST80B / WI-ST70A / WI-ST70B3 (WI-ST80 series)
A RoHS-compliant stretchable conductive silver paste series using highly flexible resin as the binder phase and fine/flake silver powder as the conductive phase, developed for flexible circuit printing on wearable devices and other stretchable substrates such as PET, TPU, and graphene films.
- Excellent flexibility and fold resistance
- strong compatibility with flexible substrates (PET, TPU, graphene)
- good conductivity, abrasion resistance, and weatherability
- maintains stable resistance and adhesion under repeated stretching.
Appearance / ColorSilver-gray paste (visual inspection) — family-typicalViscosityApprox. 14,000+/-3,000 cP (Brookfield CP-51, 15rpm) — family-typicalSolid ContentApprox. 75+/-2% — family-typicalSheet Resistance / Volume ResistivityApprox. 18 mOhm/sq/mil (four-point probe) — family-typicalAdhesion>=4B (crosscut/3M610 tape) — family-typicalHardness>=2H (pencil hardness) — family-typicalCure ConditionsApprox. 60min @ 130C on PET (oven) — family-typicalPrinting / Process ParametersN/AReliability & Aging Test ResultsWithstands 30% elongation for 2,000+ repeated stretch cycles with stable resistance/adhesionStorage Conditions & Shelf LifeStandard series guidance: vacuum-packed, store 0-10C dark; use within ~1 week of opening; 6-month shelf life; warm to room temp (23+/-2C) 2h before use; stir 5-10min at 30-50rpmDilution Ratio & Viscosity DropProduct-specific diluent (ZK-series), typically max 2% of total mass
Lidar Module PasteWI-TL20E4C
A RoHS-compliant conductive silver paste specifically formulated for lidar module applications, offering good printability suited to the precision circuit patterns required in lidar sensing components.
- Good print adaptability for fine, high-precision circuit patterns
- stable conductivity suited to lidar module signal-path requirements
- consistent with the WI-TL20 ultra-fine-line laser-etching paste family.
Appearance / ColorN/AViscosityN/ASolid ContentN/ASheet Resistance / Volume ResistivityConsistent with WI-TL20 family (low mOhm/sq/mil range; specific value not captured for this code)AdhesionN/AHardnessN/ACure ConditionsLaser-etching compatible cure profile, consistent with WI-TL20 familyPrinting / Process ParametersLaser power approx. 25-35% (per process-parameter guidance in the technical data sheet)Reliability & Aging Test ResultsN/AStorage Conditions & Shelf LifeStandard series guidance: vacuum-packed, store 0-10C dark; ~6-month shelf life; warm to room temp before useDilution Ratio & Viscosity DropN/A
Medical Electrode PasteWI-ST80A2C3
A RoHS-compliant flexible-circuit-printing conductive silver paste suited to wearable devices and medical electrode patches, using an ultra-flexible resin binder combined with fine silver powder and flake powder as the conductive phase to improve conductivity and fold resistance.
- Excellent flexibility
- strong compatibility with flexible substrates such as PET, TPU, and graphene
- good conductivity, abrasion resistance, and weatherability.
Appearance / ColorSilver-gray paste (visual inspection)Viscosity14,000+/-3,000 cP (Brookfield CP-51, 15rpm)Solid Content75+/-2% (calculated by charge weight)Sheet Resistance / Volume Resistivity=4B (crosscut/3M610 tape)Hardness>=2H (pencil hardness)Cure Conditions60min @ 130C on PET (oven)Printing / Process ParametersScreen printing: squeegee angle 60-80deg, depth 0.5-2mm; print speed 100-300mm/s; print thickness 6-8um; screen 250-350 mesh, stainless steel/polyester recommendedReliability & Aging Test ResultsN/AStorage Conditions & Shelf LifeVacuum-packed; store 0-10C dark; shelf life 6 months from production; warm to room temp (23+/-2C) 2h before use; stir 5-10min at 30-50rpmDilution Ratio & Viscosity DropDiluent ZK-80A2C3, max 2% of total mass (specific viscosity-drop curve not captured for this code)
Automotive Body-Printed PasteWI-ST80V02
A RoHS-compliant fast-curing conductive silver paste for flexible circuit printing, suited to printing on a variety of flexible thin-film substrates used in automotive body/interior applications.
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