Haomei 7075 aluminum drill entry sheet also named as 7075 aluminum drilling entry sheet, which are with high quality and advance technology, we want to highlight our product 5083 PCB drill entry sheet to you.

An entry sheet for drilling for a printed wiring board material, which comprises a water-soluble resin and a water-insoluble lubricant as essential components,an entry sheet for drilling for a printed wiring board material, which sheet comprises a metal foil having a thickness of 5 to 200 μm and a thermosetting resin layer having an average thickness of 1 to 10 μm, the thermosetting resin  layer being formed on one surface of the metal foil, and a method for drilling a hole by using the above entry sheet.

Specification

Aluminium Drilling Entry Sheet

Alloy	Temper	Specification(mm)
		Thickness	Width	Length
7075	H18	0.14~0.18	1244	1092 1041 940
			1220	1067 1016 914

MECHANICAL PROPERTY

Alloy	Temper	Thickness(mm)	U.T.S(Mpa)	Elongation(%)
7075	H18	0.14-0.18	170-190	>=2

TOLERANCE

Thickness(mm)	Width(mm)	Length(mm)	Squareness (mm)
+/-0.005mm	1	1	<=2

Chemical Composition limits(WT.%)

Alloy	Si	Fe	Cu	Mn	Mg	Cr	Ni	Zn	Ti	Al
7075	0.95		0.05~0.20	0.05	–	–	–	0.10	–	Remains

Advantages

1. AA7075-H18 can protect the circuit board against scratches and pressing marks.

2. It improves the nicety degree of the drilling position. It makes the drilling have guidance so that the drill works without deflection.

3. It significantly lengthens the life of the drill bit. Its specific alloy composition can keep the cleanness and the cooling of the drill bit. Whats more, it is a good conductor of heat so it prevents overheating of the drill bit and it can avoid the oxidation of the surface.