MEI 144

Overview

MEI-144 (Cu-TBC) is tin and phosphorus co-doped copper (76% IACS) with improved softening resistance at elevated temperatures. Not susceptible to
hydrogen embrittlement. Ideal for semiconductor components, connectors and terminals requiring thermal stability.

CHEMICAL COMPOSITION (wt. %)		ALLOY DESIGNATIONS		COIL / SHEET SPECIFICATIONS
Element	Composition (%)	Standard	Designation	Specification	Range
Cu	≥99.500 (Min.)	IS	IS 3331	Thickness (mm)	0.04 – 3.0
P	0.015 – 0.045	JIS	—	Width (mm)	6.00 – 406
Sn	0.070 – 0.200	ISO	Cu TBC	Inner Dia. (mm)	100 / 150 / 200 / 300 / 400 / 500
		ASTM	C14410	Coil Wt. (kg/mm)	1.0 – 4.0
		BS	—	Sheet Length (m)	0.50 – 4.00

MECHANICAL PROPERTIES — typical values at 20°C
Temper	Code	HV	Tensile MPa	Yield MPa	Elongation % (min)
Annealed	O	40–60	200–250	≤100	25
1/4 Hard	HA	60–80	250–300	≤140	20
1/2 Hard	HB	80–100	300–360	≥270	10
Hard	HD	105–125	360–430	≥310	7
Extra Hard	EH	≥125	≥430	≥410	4

PHYSICAL PROPERTIES — annealed temper at 20°C
Density (g/cm³)	Elec. Conductivity (% IACS)	Thermal Conductivity (W/m·K)	Modulus of Elasticity (GPa)	Specific Heat (J/kg·K)
8.94	76	330	120	385

FABRICATION PROPERTIES
Fabrication Property	Rating	Fabrication Property	Rating
Capacity for Cold Working	Excellent	Soft Soldering	Excellent
Machinability	Less suitable	Resistance Welding	Less suitable
Electroplating	Excellent	Gas Shielded Arc Welding	Excellent
Hot Dip Tinning	Excellent	Laser Welding	Good

CORROSION RESISTANCE

MEI-144 is generally less subject to corrosion than other engineering metals. Resistant to industrial atmosphere, industrial and drinking water (max flow 4.5–6.0 ft/s), pure water vapour, non-oxidizing acids, alkalis (except ammonia/cyanide) and neutral saline solutions. Not resistant to oxidizing acids, hydrous ammonia, halogenated gases or seawater at high flow rates.

TYPICAL APPLICATIONS
• Heat exchangers and thermal management	• Transistors and semiconductor components
• Mineral insulated cables	• Connectors, terminals and strip for plating