Chemtronics CW2900, CircuitWorks Flex Conductive Pen, 8.5g Pen
Chemtronics CW2900 — CircuitWorks Flex Silver Conductive Pen, 8.5g
The Chemtronics CW2900 CircuitWorks Flex Conductive Pen (SKU: CW2900) is a silver-based conductive ink pen specifically engineered for use on flexible PCBs. It creates instant, highly conductive silver traces that dry in minutes at room temperature, with excellent adhesion to most electronic materials. Ideal for rework, repair, and prototyping — linking components, repairing defective traces, and making smooth jumpers on both rigid and flexible circuit boards. Solderable at low temperatures. Supplied in an 8.5g (0.3oz) valve-tip pen.
Key Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | CW2900 |
| Ink Type | Silver flex conductive ink |
| Net Weight | 8.5g (0.3 oz) |
| Conductivity | 0.05–0.15 ohms/sq/mil |
| Tip Type | Standard tip (STP) — valve pen |
| Dry Time | Minutes at room temperature |
| Solderable | Yes — at low temperatures |
| Substrate Compatibility | Flexible PCBs and most electronic materials |
| Brand | Chemtronics |
Applications
- Repairing defective or damaged traces on flexible PCBs
- Linking components and making smooth jumpers
- Rework and repair of rigid and flexible circuit boards
- EMI/RFI shielding of electronics
- Prototyping conductive traces and connections
Frequently Asked Questions
What is the difference between CW2900 (Flex) and CW2200STP (standard silver pen)?
The CW2900 uses a flex-formulated silver ink specifically engineered for flexible PCBs, where the cured trace must withstand bending and flexing without cracking or delaminating. The CW2200STP uses standard silver conductive ink optimized for rigid PCBs. Use the CW2900 for any application involving flexible substrates or where the trace will be subject to mechanical flexing after curing.
How conductive are the traces made with CW2900?
The CW2900 produces silver traces with a conductivity of 0.05–0.15 ohms/sq/mil — suitable for signal traces, jumpers, and component linking on circuit boards. For very low-resistance power connections, consider the trace geometry and length, as resistance increases with trace length and decreases with trace width.
Can CW2900 traces be soldered?
Yes — CW2900 traces are solderable at low temperatures, allowing components to be soldered directly to repaired or newly created traces. Use low-temperature solder and minimize heat exposure to avoid damaging the flexible substrate.
How long does CW2900 take to dry?
CW2900 dries in minutes at room temperature. Full cure and maximum conductivity are achieved after complete drying. Avoid disturbing the trace until fully dry. Gentle warming can accelerate drying if needed — refer to the Chemtronics TDS for cure schedule details.
What tip size does the CW2900 come with?
The CW2900 comes with a standard tip (STP) valve pen, suitable for general trace repair and jumper work. For fine-pitch or narrow trace repair requiring a finer line, consider the CW2200MTP (micro tip version of the standard silver pen). Contact MTE Solutions for tip and pen selection assistance.
