Tinplate

From standard industry products to leading-edge products, this product is used in the lives of people around the world.

In order to assure the properties suitable for various uses, tin plate used as material for cans and other purposes is made under strict quality control.

Product		Tinplate		Hi-Top
		Tin (Sn=2.8 g/m²)	LTS	Hi-Top (TFS)	WHT-2
Weldability	RC value (mΩ) *1	0.1 to 0.3	0.1 to 0.3	100 to 200	0.1 to 0.3
	Assessment	Good	Good	Bad	Good
Rust proofing	Salt spray test *2	Excellent	Good	Poor	Poor
Coating materials	Cup process adhesion test *3	Poor	Good	Excellent	Excellent
Adhesion	T peel test *4	Poor	Good	Excellent	Excellent

(Comments)

1. RC value: Test materials heat processed for 20 minutes at 205 degree centigrade then contact electrical resistance is measured using our company's RC measuring instruments (RC value: Small → Weldability: Good)
2. Salt spray test: 35 degree centigrade, 5% salt solution sprayed for 2 hours → visual inspection
3. Cup process adhesion test: Lacquer coating → cup process → cup wall surface coated film strength peeled with tape → visual inspection
4. T peel test: Lacquer coating → Cut to 5 mm width → 2 test material sheets thermally compressed via nylon film → Measure peeling stress

Weldability

The following diagram shows an example of the weldable current range using manufactured can seam welder. Good welding materials possess a wide weldable current range.

The manufacturable range depends on the combination of each specification (thickness, width, temper etc.).
Ask us especially about combination specifications with sheet thickness upper and lower limits and sheet width upper limits.
Also ask us about specifications as needed.

Tin is manufactured under strict quality controls based on standards comparable to JIS G 3303.

Tempering (Temper Grade)

	Tempering Codes	Hardness （HR-30T）	Features	Main Uses
Single press roll	T-1	49±5	Especially good flexibility	Deep drawn cans, caps, etc.
	T-2	53±5	Medium flexibility and strength	General drawn cans, caps, etc.
	T-2.5	55±5	Flexibility and adequate strength	General food cans, etc.
	T-3	57±5	Moderate strength	General food cans, etc.
	T-4	61±5	Relatively high strength	Bodies, tops, bottoms, and caps of general cans, etc.
	T-5	65±5	Superior bend resistance	Large cans, internal pressure cans, etc.
Double press roll	DR-8	73±5	Superior rigidity and strength	Bodies of carbonated drink and beer cans, etc.
	DR-9	76±5	Superior rigidity and strength	Tops of carbonated drink and beer cans, etc.
	DR-9M	77±5	Superior rigidity and strength	Tops of carbonated drink and beer cans, etc.
	DR-10	80±5	Excellent rigidity and strength	Lids of 18-liter cans, etc.

Plating amount

Type Codes	Classification	Nominal plating mass (g/m²)	Minimum plating mass (g/m²)
SPTE	Uniform thickness plating	2.8/2.8	2.45/2.45
		5.6/5.6	5.05/5.05
		8.4/8.4	7.55/7.55
		11.2/11.2	10.1/10.1
	Differential thickness plating	5.6/2.8	5.05/2.45
		8.4/2.8	7.55/2.45
		8.4/5.6	7.55/5.05
		11.2/2.8	10.1/2.45
		11.2/5.6	10.1/5.05
		11.2/8.4	10.1/7.55

(Remarks)

1. Tinplated film thickness [µm] = Tin adhesion coverage [g/m²] ÷ Tin's specific gravity (7.3 [g/cm³])
2. Enables tin plating at 1.3 to 11.2 g/m² range (Enables equal front and back surface thickness and differential plating)

Surface finish

Surface finish name	Code	Surface roughness Target value µmRa	Features
Bright E	BE	≦0.20	Very glossy finish with superior solderability.
Bright	B	0.25	Gloss finish, widely used for general purposes.
Light roughness side	BR	0.3	Lightly polished finish only used for double rolled products.
Rough	R1	0.4	An original whetstone-like finish on which scratches do not show up.
Very rough	R2	0.6	An original rough whetstone-like finish that keeps the surface unmarred.
Matte	M	1	A dull, semigloss finish that is non-reflown.
Silver 1	S1	1	A dull finish that is reflown.
Silver 2	S2	1	A dull finish that is reflown.
Silver 4	S4	3	A dull finish that is reflown.