C21000 Brass Strip - Knowledge

What is C21000 Brass Strip?

C21000 Brass Strip is a highly stable, low-maintenance roofing and curtain wall material that is environmentally friendly, safe, easy to process, and highly corrosion-resistant. Its stable protective layer allows the copper sheet to last for over a century. The economic performance of C21000 Brass Strip makes it one of the best metal roofing materials.

1) The yield strength and elongation of C21000 Brass Strip are inversely proportional. Copper sheet has extremely high hardness after bending, but this can be reduced through heat treatment.

2) Among all building metal materials, C21000 Brass Strip has the best elongation performance, offering significant advantages in architectural design.

3) C21000 Brass Strip has no processing temperature restrictions, does not easily become brittle at low temperatures, and can be thermofused at high melting points using oxygen blowing welding.

4) Fire-retardant and non-combustible material.

5) Even in extremely corrosive environments, C21000 Brass Strip can form a strong, non-toxic passivation protective layer, commonly known as "verdigris." Its chemical composition depends on local air conditions, but different compositions of patina provide the same protection to copper surfaces. This passivation film is very stable and can self-repair after damage. Its presence is difficult to detect with the naked eye.

C21000 Brass Strip Chemical Composition

Alloy Grade	Cu	Fe	Pb	Ni	Zn	Impurity
C28000	57.0-60.0	0.3	0.5	0.5	margin	1
C28000	60.5-63.5	0.15	0.08	0.5	margin	0.5
C27000	63.5-68.0	0.1	0.03	0.5	margin	0.3
C26200	67.0-70.0	0.1	0.03	0.5	margin	0.3
C26000	68.5-71.5	0.1	0.03	0.5	margin	0.3
C24000	79.0-81.0	0.1	0.03	0.5	margin	0.3
C23000	84.0-86.0	0.1	0.03	0.5	margin	0.3
C22000	88.0-91.0	0.1	0.03	0.5	margin	0.2
C21000	95.0-97.0	0.1	0.03	0.5	margin	0.2

C21000 Brass Strip Mechanical Properties

Alloy Grade	Melting Temperature ℃		Boiling Point ℃	Density kg·(kg·mˉ3)	C J·(kg·℃)ˉ1	Coefficient of Linear Expansion	Thermal Conductivity W·(m·K)ˉ1	Conductivity %IACS	Conductivity %IACS		Resistivity μΩ·m
	Liquidus	Solidus							Solid state	Liquid state
C28000	896	886		8400		21.0X10ˉ6	125.1				0.0025
C28000	906	899		8430		20.6X10ˉ6	116.7	27	0.071		0.0017
C27000	936	906		8470		20.1X10ˉ6	116.7	27	0.067
C26200	939	910		8500		20.0X10ˉ6	116.7	27	0.064		0.0015
C26000	951	916	≈ 1150	8530	0.09	19.9X10ˉ6	120.9	28	0.062	0.39	0.0015
C25000	981.2			8630		19.6X10ˉ6	120.9	30	0.057
C24000	1001.2	966	≈ 1240	8660	0.093	19.1X10ˉ6	141.7	32	0.054	0.33	0.0015
C23000	1026.3	991	≈ 1300	8750	0.095	18.7X10ˉ6	151.7	37	0.047	0.29	0.0016
C22000	1046.4	1026.3	≈ 1400	8800	0.095	18.4X10ˉ6	187.6	44	0.04	0.27	0.0018
C21000	1071.4	1056.4	≈ 1600	8850	0.093	18.0X10ˉ6	243.9	57	0.031	0.24	0.0027

Applications of C21000 Brass Strip

C21000 Brass Strip offers excellent processability and strength, suitable for processing curved, trapezoidal, and corner shapes in various processes and systems, such as flat interlocking systems, vertical edge closure systems, BEM systems, unitized wall panels, and rainwater drainage systems.

Multiple surface treatments are available to meet diverse architectural needs.

(1) Oxidized copper strips create a uniform brown appearance.

(2) Antique copper strips are used for renovations of old buildings or new construction with special requirements.

(3) Original copper strips offer a gradient effect with metallic luster, giving buildings a more vibrant feel.

(4) Tin-plated copper strips achieve the effect of titanium-zinc plating.

FAQ

Q: What is C21000 brass used for?
A: C21000 is commonly used in architectural decoration, jewelry crafting, medals, nameplates, electrical connectors, and decorative hardware due to its aesthetic appeal, formability, and good conductivity.

Q: Can C21000 be welded or brazed?
A: Yes, C21000 can be welded and brazed using appropriate techniques. Oxyacetylene welding, TIG, and resistance welding are suitable, while brazing with silver-based or phosphorus-copper fillers is common.

Q: Is C21000 corrosion resistant?
A: C21000 offers good corrosion resistance in atmospheric, freshwater, and mild chemical environments. However, it is not recommended for prolonged exposure to seawater or highly acidic/alkaline conditions.

Q: What is the difference between C21000 and C26000?
A: The primary difference is copper content: C21000 (~95% Cu) is softer and more ductile with a reddish-gold color, while C26000 (~70% Cu) is stronger and more widely used in cartridges and mechanical parts.

Q: Where can I buy C21000 brass sheet or strip?
A: C21000 products are supplied by specialized metal distributors, mills, and online metal suppliers. Ensure the supplier provides certified Mill Test Reports (MTR) for quality assurance.

Q: Does C21000 contain lead?
A: Standard C21000 is typically lead-free. However, always verify with the supplier's material certification to ensure compliance with regulations like RoHS or NSF for specific applications.

Q: What tempers or forms is C21000 available in?
A: C21000 is commonly supplied in annealed (soft), half-hard, and hard tempers. Available forms include sheet, strip, foil, wire, tube, and occasionally rod.

Q: Can C21000 be polished or plated?
A: Yes, C21000 takes well to mechanical polishing, buffing, and electroplating (e.g., nickel, gold, or chrome) for enhanced appearance and durability.

Our factory

Our supply scope covers a comprehensive range of high-performance copper and copper alloy products tailored to diverse industrial applications. We provide precision-engineered copper tubes for HVAC and refrigeration systems, sheets and plates for architectural cladding and electrical components, rods and bars for machining and fabrication, wires for conductive and mechanical purposes, as well as strips and foils for electronic and automotive industries. All products are available in various alloys - including pure copper, brass, bronze, phosphor bronze, copper-nickel, and specialty alloys - and can be supplied in standard sizes or customized dimensions, tempers, and finishes to meet your exact specifications.

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