GR7 GR9 Titanium Foil

Titanium foils are ultra-thin flat products, typically defined as thicknesses below 0.3 mm (0.012"), produced through precision cold rolling processes that achieve exceptional thickness uniformity, surface finish, and mechanical properties. GR7 and GR9 foils bring specialized performance characteristics to this ultra-thin format.

 

Element	GR7 Requirement	GR7 Typical	GR9 Requirement	GR9 Typical
Titanium (Ti)	Balance	Balance	Balance	Balance
Aluminum (Al)	–	–	2.5 – 3.5%	3.0%
Vanadium (V)	–	–	2.0 – 3.0%	2.5%
Palladium (Pd)	0.12 – 0.25%	0.15 – 0.20%	–	–
Iron (Fe)	≤ 0.30%	0.12 – 0.20%	≤ 0.25%	0.12 – 0.18%
Oxygen (O)	≤ 0.25%	0.15 – 0.20%	≤ 0.15%	0.10 – 0.12%
Carbon (C)	≤ 0.08%	0.01 – 0.02%	≤ 0.08%	0.01 – 0.02%
Nitrogen (N)	≤ 0.03%	0.01 – 0.02%	≤ 0.03%	0.01 – 0.02%
Hydrogen (H)	≤ 0.015%	0.001 – 0.003%	≤ 0.015%	0.001 – 0.003%

 

Property	GR7	GR9
Tensile Strength (min)	≥ 345 MPa	≥ 620 MPa
Yield Strength (min)	≥ 275 MPa	≥ 483 MPa
Elongation	≥ 20%*	≥ 15%*
Hardness (typical)	75 – 85 HRB	24 – 28 HRC
Modulus of Elasticity	103 – 107 GPa	100 – 110 GPa

 

Property	GR7	GR9	Units
Density	4.51	4.48	g/cm³
Melting Point	1660 – 1700	1640 – 1690	°C
Thermal Conductivity	16 – 19	8.5 – 9.5	W/m·K
Electrical Resistivity	0.48 – 0.55	1.4 – 1.6	µΩ·m
Specific Heat Capacity	520 – 540	540	J/kg·K
Thermal Expansion	8.6 – 9.2	8.6 – 9.2	µm/m·°C
Magnetic Properties	Non-magnetic	Non-magnetic	–

 

Environment	GR7	GR9
Seawater	Excellent	Excellent
Oxidizing Acids (HNO₃)	Excellent	Good
Reducing Acids (H₂SO₄, HCl)	Superior	Moderate
Crevice Corrosion	Excellent	Moderate
Hot Chlorides	Excellent	Good
Wet Chlorine	Excellent	Good

 

Mill Test Report (EN 10204 3.1) – full chemical and mechanical properties

Certificate of Conformance

Heat/Lot Traceability

Thickness Certification – documented measurements

Palladium Content Verification (GR7) – actual analyzed value

Third-Party Inspection – available upon request

 

Q1: What is the difference between GR7 and GR9 foils?

Parameter	GR7	GR9
Primary Advantage	Superior corrosion resistance	High strength + formability
Tensile Strength	345 MPa	620 MPa
Formability	Excellent	Very Good
Corrosion Resistance	Superior in reducing acids	Good (CP-equivalent)
Best For	Chemical processing, aggressive environments	Aerospace, medical, formed components

 

Q2: What is the thinnest foil available?

Both grades are available down to 0.012 mm (12 microns, 0.0005 inches). Thinner gauges may be available for specific applications – please inquire.

 

Q3: What widths are available?

Cut-to-Length: 10 – 600 mm

Coiled: 10 – 400 mm

Strip: 2 – 200 mm (traverse-wound)

 

Q4: Can GR9 foil be formed as easily as GR7?

GR7 offers slightly better formability due to its CP nature. GR9 offers very good formability for an alloy grade – approximately twice the formability of Grade 5 (Ti-6Al-4V).

 

Q5: What surface finishes are available?

Cold Rolled Bright – standard (Ra 0.2-0.4 µm)

Mirror Polished – for optical/decorative (Ra < 0.1 µm)

2B Finish – for medical applications (Ra 0.3-0.5 µm)

Pickled – for chemical processing (GR7) (Ra 0.5-1.0 µm)

 

Application Requirement	Recommended Grade
Chemical processing, reducing acids	GR7
Aggressive corrosion environments	GR7
Crevice corrosion concerns	GR7
High strength-to-weight ratio	GR9
Aerospace components	GR9
Formed parts requiring strength	GR9
Medical devices (non-implant)	Either
General corrosion resistance	Either
Maximum formability	GR7

 

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