Technical data sheet for 3M DP420 Black epoxy adhesive, covering properties, curing, performance, handling, and storage.
The 3M DP420 Black epoxy adhesive is a two‑part, high‑performance adhesive offering high shear and peel strength, low halogen content, and UL 94 HB flame rating. The data sheet provides detailed uncured and cured physical properties, curing characteristics, and adhesive performance on a variety of substrates.
The document also includes handling and application instructions, surface‑preparation procedures, storage guidelines, shelf‑life information, and safety precautions. It is intended for technical reference and not for specification purposes.
| Mix Ratio (B:A) – Volume | 2 : 1 |
|---|---|
| Worklife at 23 °C (20 g mixed) | 15 min |
| Shore D Hardness (cured) | 75‑80 |
| Electrical Dielectric Strength | 888 V/mil |
| Volume Resistivity | 1.6 × 10¹⁵ Ω·cm |
| Recommended Storage Temperature | 15‑27 °C (60‑80 °F) |
| Shelf Life (original container) | 15 months at room temperature |
The adhesive should be mixed at a 2 : 1 volume ratio (2 parts resin to 1 part accelerator), which corresponds to a weight ratio of 2 : 0.97.
At 23 °C, the worklife is 15 minutes for a 20 g mixed batch and 30 minutes for a 5 g mixed batch.
The product has a shelf life of 15 months when stored in its original container at room temperature.
Store the adhesive between 15 °C and 27 °C (60 °F‑80 °F) for maximum shelf life.