MEI 122

Overview

MEI-122 (Cu-DHP) is the most commonly used deoxidised copper grade with 81% IACS conductivity. Not susceptible to hydrogen embrittlement. Superior
joining performance versus ETP makes it the standard choice for heat exchangers, plumbing and refrigeration tubing.

CHEMICAL COMPOSITION (wt. %)		ALLOY DESIGNATIONS		COIL / SHEET SPECIFICATIONS
Element	Composition (%)	Standard	Designation	Specification	Range
Cu	≥99.90	IS	IS 191/14811	Thickness (mm)	0.04 – 3.0
P	0.015 – 0.040	JIS	C1220	Width (mm)	6.00 – 406
		ISO	Cu DHP	Inner Dia. (mm)	100/150/200/300/400/500
		ASTM	C12200	Coil Wt. (kg/mm)	1.0 – 4.0
		BS	C106	Sheet Length (m)	0.50 – 4.00

MECHANICAL PROPERTIES — typical values at 20°C
Temper	Code	HV	Tensile MPa	Yield MPa	Elong. T<0.1	Elong. T>0.1
Annealed	O	40–60	200–250	≤100	≥20	≥35
1/4 Hard	H01	60–75	220–260	≤140	≥10	≥15
1/2 Hard	H02	70–90	240–290	≥180	≥5	≥10
Hard	H04	90–110	290–360	≥250	≥2	≥4
Extra Hard	H06	≥110	≥360	≥320	—	—

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)
8.92	81	340	132	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-122 is generally less subject to corrosion than other engineering metals. Resistant to industrial atmosphere, industrial and drinking water, 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 HVAC components	• Transistors and electronic components
• Strip for plating and mineral insulated cables	• Pipelines and plumbing fittings