MAS Medium Hardener – 2:1 Non-Blushing Epoxy Hardener
MAS Medium Hardener is the all-round speed in the MAS 2:1 non-blushing system. Mixed 2:1 by volume with MAS LV or FLAG Resin, it gels in about 25 minutes (150 g at 25 °C), is tack-free in about 3 hours and is fully cured in about 3.5 days. Thickened mixes set fast enough to resist sagging while still giving you time to work, so MAS recommends Medium for filleting, fairing and filled FLAG Resin work, as well as medium-sized laminations in mild temperatures.
Features
- About a 25-minute gel and 3-hour tack-free time at 25 °C
- Non-blushing: no wash-downs between coats
- MAS's recommended hardener for fillets, fairing and filled FLAG Resin
- Good for medium-sized laminating jobs in mild temperatures
- Blend with MAS Fast or Slow Hardener for custom working times
- Cures clear
Specifications
| Property | Details |
|---|---|
| Mix ratio by volume | 2:1 (resin:hardener) |
| Mix ratio by weight | 100:45 |
| Gel time, 150 g at 25 °C (77 °F) | 25 min |
| Tack-free time at 25 °C | 3 hrs |
| Full cure at 25 °C | 3.5 days |
| Mixed viscosity at 25 °C | 600 cP with LV Resin, 1,000 cP with FLAG Resin |
| Minimum working temperature | 55 °F (13 °C) |
| Compatible resins | MAS LV Resin, MAS FLAG Resin |
Working and cure times for all three MAS hardeners:
| Property | Fast | Medium | Slow |
|---|---|---|---|
| Mix ratio by volume | 2:1 | 2:1 | 2:1 |
| Mix ratio by weight | 100:46 | 100:45 | 100:45 |
| Gel time, 150 g at 25 °C (77 °F) | 10 min | 25 min | 40 min |
| Tack-free time at 25 °C | 2 hrs | 3 hrs | 5 hrs |
| Full cure at 25 °C | 2 days | 3.5 days | 5 days |
| Minimum working temperature | 55 °F (13 °C) | 55 °F (13 °C) | 55 °F (13 °C) |
Safety and storage: MAS Medium Hardener (Part B) is labelled DANGER: harmful if swallowed; harmful in contact with skin; causes severe skin burns and eye damage; may cause an allergic skin reaction; suspected of damaging fertility or the unborn child; harmful to aquatic life with long lasting effects. Wear nitrile gloves, safety glasses and long sleeves, and work in a well-ventilated area. Clean uncured epoxy off skin with soap and water, never solvents. Store between 60 and 90 °F (16–32 °C) in a dry place, off cold floors and away from outside walls, and do not freeze. If the resin crystallizes, warm it to 125–140 °F (52–60 °C) and stir until clear. For safety information, refer to the Safety Data Sheet below.
Data Sheets