MG Chemicals 8331D-14G, Silver Conductive Epoxy Adhesive, 14g Syringe Kit, Case of 1 Kit
MG Chemicals 8331D-14G, Silver Conductive Epoxy Adhesive, 14g Syringe Kit, Case of 1 Kit
MG Chemicals 8331D-14G is a silver-filled, two-part electrically conductive epoxy adhesive for permanent conductive bonding and cold-soldering repairs. Its smooth, non-sagging, thixotropic consistency supports localized application on electronics and substrates where conventional soldering is unsuitable. MG identifies 8331D as an improved version of its original 8331 formula.
This listing contains one two-syringe kit with a combined net volume of 6 mL and net weight of 14.4 g. The 14G SKU is the package designation, not a statement that each syringe contains 14 g.
Best Uses / Applications
- Repairing conductive traces on PCBs and electronic assemblies.
- Bonding heat-sensitive components where soldering would be unsuitable.
- Making conductive connections to glass, soft metals, and plastics, subject to substrate qualification.
- Filling seams between metal plates for EMI/RFI shielding applications.
- Electronics repair, prototyping, and localized permanent conductive bonding.
- Conductive thermal bonding where electrical conduction is acceptable; contain the adhesive to prevent short circuits.
Key Features
- Silver-filled epoxy combines electrical conduction with mechanical bonding.
- Smooth, non-sagging, thixotropic consistency.
- Equal-volume mixing: Part A to Part B is 1:1 by volume.
- Room-temperature cure or accelerated heat cure.
- Adhesion to many substrates, including metals, glass, wood, and most plastics.
- Manufacturer-listed resistance to humidity, salt water, mild bases, and aliphatic hydrocarbons.
- Room-temperature storage and long shelf life.
- Manufacturer identifies the formulation as SVHC free; consult current manufacturer documentation for procurement requirements.
Technical Specifications
Values below follow the manufacturer TDS dated May 19, 2026. Its 35-minute working time supersedes the 20-minute value still displayed on the vendor product webpage for this listing.
| Manufacturer / SKU | MG Chemicals / 8331D-14G |
|---|---|
| Packaging | One two-syringe kit |
| Combined net volume / weight | 6 mL / 14.4 g |
| Mix ratio, A:B by volume | 1:1 |
| Mix ratio, A:B by weight | 1.1:1 |
| Working time at 22°C | 35 minutes |
| Set time at 22°C | 40 minutes; not the full cure time |
| Cure schedules | 6 hours at room temperature; alternatively 10 minutes at 65°C or 5 minutes at 80°C |
| Cured resistivity | 1.8 × 10-3 Ω·cm, ASTM D257 |
| Service temperature range | -50 to 150°C |
| Thermal conductivity at 25°C | 1.5 W/(m·K) |
| Cured color / hardness | Silver grey / 78 Shore D |
| Tensile / compressive strength | 13 / 69 N/mm² |
| Lap shear strength | 5.6 N/mm² on stainless steel; 5.1 N/mm² on aluminum |
| Storage | 16–27°C, dry, away from sunlight; recap firmly |
| Listed shelf life | 3 years under specified storage conditions |
Preparation, Mixing & Cure
Read the kit SDS before use. The TDS recommends cleaning the substrate with isopropyl alcohol, MG 824, to remove oils, dust, and residues. Check solvent compatibility with the substrate. Measure equal volumes of Parts A and B from the syringes and mix thoroughly on a suitable mixing surface or in a container. If weighing material instead, use 1.1 parts A to 1 part B by weight. Do not treat the volume and weight ratios as interchangeable.
Clean the syringe nozzles and replace their caps to prevent contamination and buildup. Select a cure schedule compatible with the entire assembly. Working time and set time are not full cure. Validate electrical and mechanical performance before placing the repaired assembly into service.
Format & Selection Comparison
| Product | Format / distinction | Selection consideration |
|---|---|---|
| 8331D-14G | Two-syringe kit, 6 mL / 14.4 g | Small repairs and localized dispensing; this listing |
| 8331D-120G | Two-jar kit, 50 mL / 120 g | Larger quantities of the same 8331D formulation |
| 8330D | Higher-fill conductive epoxy | Manufacturer-recommended alternative when maximizing conductivity is the priority |
| 8331S | Different conductive epoxy formulation | Manufacturer-recommended alternative for longer working time; verify its own TDS and package size |
| Conductive paint | Coating rather than bonding adhesive | Broad-area shielding, rather than using epoxy over large surfaces |
Frequently Asked Questions
What is 8331D-14G used for?
It is used for electrically conductive bonding, trace repair, cold-soldering repairs, and EMI/RFI shielding seam filling.
How much material is in the kit?
The two-syringe kit contains a combined 6 mL and 14.4 g. One kit is supplied in this listing.
Is the mix ratio 1:1?
Yes by volume. By weight, use 1.1 parts A to 1 part B. Thorough mixing and the correct measurement method are essential.
Is working time 20 or 35 minutes?
The May 19, 2026 TDS lists 35 minutes at 22°C, while the vendor webpage still states 20 minutes. This page follows that dated TDS. Confirm the applicable instructions for your supplied batch if your process depends on working time.
How long does it take to cure?
The TDS lists 6 hours at room temperature, or accelerated schedules of 10 minutes at 65°C and 5 minutes at 80°C. Its 40-minute set time at 22°C is not full cure.
Can it replace solder?
It is an option where soldering is unsuitable, including heat-sensitive components and some non-solderable substrates. It is not an automatic equivalent to a soldered joint: qualify conductivity, bond strength, temperature, and circuit requirements for the application.
Is it electrically insulating?
No. This silver-filled adhesive conducts electricity. Keep it away from adjacent conductors where it could cause shorts. Select an electrically insulating adhesive when isolation is required.
Does it need refrigeration?
The TDS specifies storage at 16–27°C in a dry area away from sunlight, with containers firmly recapped. Refrigerated storage is not the specified condition.
Should I choose 8331D, 8330D, or 8331S?
8331D is formulated as an economical conductive bonding option. MG recommends 8330D for higher fill that maximizes conductivity and 8331S for longer working time. Compare each product's current TDS rather than transferring specifications between formulas.
