MATERIALS, ADHESIVES AND COATINGS
EP3HTSMed, EP3HTSDA-2Med, EP21TDCSMed, EP77M-FMed, EP4G-80Med electrically conductive epoxies (silver, graphite) for medical electronics (< 0.001 Ω·cm, USP Class VI, ISO 10993-5)
Country: · Model: EP3HTSMed, EP3HTSDA-2Med, EP21TDCSMed, EP77M-FMed, EP4G-80Med
The Med line of five electrically conductive epoxies based on silver and graphite for assembling medical electronics where soldering harms heat-sensitive components. The volume resistivity of the silver grades is below 0.001 Ω·cm, and graphite EP4G-80Med has 50–100 Ω·cm. The materials are certified to USP Class VI or ISO 10993-5.
- EP3HTSMed
- one-component, silver; thixotropic paste; 40–90 min at 121 °C or 20–40 min at 149 °C (min. 113–116 °C); 60–80 Shore D; −51…+204 °C; < 0.001 Ω·cm; USP VI
- EP3HTSDA-2Med
- one-component for die attach; > 400 000 mPa·s; 20–30 min at 121 °C or 5–10 min at 149 °C; −62…+232 °C; thermal conductivity ≈ 6.5–7.1 W/(m·K); < 0.001 Ω·cm; ISO 10993-5
- EP21TDCSMed
- two-component, silver; overnight at 24 °C + 2–3 h at 66–93 °C; 50–60 Shore D; from 4 K to +121 °C; shear 5.5–6.9 MPa; < 0.001 Ω·cm; USP VI
- EP77M-FMed
- two-component 1:1, silver; 24 h at 24 °C; 40–50 Shore D; −73…+121 °C; 1.44–1.73 W/(m·K); 10⁻³ Ω·cm
Technical specifications
| EP3HTSMed | one-component, silver; thixotropic paste; 40–90 min at 121 °C or 20–40 min at 149 °C (min. 113–116 °C); 60–80 Shore D; −51…+204 °C; < 0.001 Ω·cm; USP VI |
|---|---|
| EP3HTSDA-2Med | one-component for die attach; > 400 000 mPa·s; 20–30 min at 121 °C or 5–10 min at 149 °C; −62…+232 °C; thermal conductivity ≈ 6.5–7.1 W/(m·K); < 0.001 Ω·cm; ISO 10993-5 |
| EP21TDCSMed | two-component, silver; overnight at 24 °C + 2–3 h at 66–93 °C; 50–60 Shore D; from 4 K to +121 °C; shear 5.5–6.9 MPa; < 0.001 Ω·cm; USP VI |
| EP77M-FMed | two-component 1:1, silver; 24 h at 24 °C; 40–50 Shore D; −73…+121 °C; 1.44–1.73 W/(m·K); 10⁻³ Ω·cm |
| EP4G-80Med | one-component, graphite; 4000–10 000 mPa·s; 60–90 min at 80 °C; −50…+175 °C; Tg 130–140 °C; 50–100 Ω·cm |
| Storage of EP3HTSMed | 6 months in jars, 3 months in syringes at room temperature |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
EP3HTSMed is a one-component thixotropic silver paste that does not cure at room temperature, so it is stored for 6 months in jars or 3 months in syringes. Curing takes 40–90 minutes at 121 °C or 20–40 minutes at 149 °C, with a lower limit of 113–116 °C; the shear strength exceeds 7 MPa, the hardness is 60–80 Shore D and the range −51…+204 °C. EP3HTSDA-2Med is intended for die attach, has a thermal conductivity of about 6.5–7.1 W/(m·K) and cures in 20–30 minutes at 121 °C or 5–10 minutes at 149 °C, in a range of −62…+232 °C. The two-component EP21TDCSMed and EP77M-FMed cure without heating. The first works from 4 K to +121 °C, gives shear of 5.5–6.9 MPa and needs a night at 24 °C and 2–3 hours at 66–93 °C. EP77M-FMed is mixed 1:1, cures in 24 hours at 24 °C, and has a resistivity of 10⁻³ Ω·cm and a thermal conductivity of 1.44–1.73 W/(m·K). EP4G-80Med is a one-component graphite epoxy with a viscosity of 4000–10 000 mPa·s that cures in 60–90 minutes at 80 °C, has a Tg of 130–140 °C and works from −50 to +175 °C.
How to choose
The first choice is the cure method. If the assembly cannot tolerate heating, take the two-component EP21TDCSMed or EP77M-FMed, and for fast curing in an oven EP3HTSMed or EP3HTSDA-2Med. EP21TDCSMed suits cryogenic assemblies. Graphite EP4G-80Med conducts worse (50–100 Ω·cm), but cures at as little as 80 °C.
Request a price and lead time
EP3HTSMed, EP3HTSDA-2Med, EP21TDCSMed, EP77M-FMed, EP4G-80Med electrically conductive epoxies (silver, graphite) for medical electronics (< 0.001 Ω·cm, USP Class VI, ISO 10993-5). We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What is the resistivity of the silver adhesives EP3HTSMed and EP3HTSDA-2Med?
Less than 0.001 Ω·cm, as for EP21TDCSMed. EP77M-FMed has a resistivity of 10⁻³ Ω·cm, and graphite EP4G-80Med 50–100 Ω·cm.
What can replace soldering when mounting LEDs and dies?
EP3HTSDA-2Med is intended for die attach; it cures in 20–30 minutes at 121 °C or 5–10 minutes at 149 °C and has a thermal conductivity of 6.5–7.1 W/(m·K).
At what temperature does EP4G-80Med cure?
60–90 minutes at 80 °C is enough. The glass transition temperature is 130–140 °C and the operating range −50…+175 °C.
How long can EP3HTSMed be stored?
At room temperature 6 months in jars and 3 months in syringes. Nothing needs mixing, and the adhesive cures only when heated.
Which grade works at cryogenic temperatures?
EP21TDCSMed, range from 4 K to +121 °C. Shear strength is 5.5–6.9 MPa, and the grade meets USP Class VI.
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