About Lead-Free Material (C6801)

1. Handling of RoHS2 Compliant Material (C6801)

In preparation for the potential expiration of the RoHS 2 exemption for brass materials, our company is actively promoting the use of products manufactured with lead-free material (C6801).

Metal Materials Currently Exempted Under the RoHS Directive

● Lead content up to 0.35 wt% in steel materials ● Lead content up to 0.4 wt% in aluminum

● Lead content up to 4 wt% (40,000 ppm) in copper alloys (brass)

Although the above exemption is currently still permitted under the RoHS Directive, it remains subject to future review, and some exemptions are scheduled to expire between 2026 and 2027. In addition, since lead has been designated as an SVHC (Substance of Very High Concern) under the REACH Regulation, demands for reducing the use of lead-containing materials and switching to lead-free materials have been increasing year by year, particularly in the European market.

In light of these regulatory trends and potential future compliance risks, our company offers machined products made from lead-free materials to help reduce our customers’ environmental compliance burden and prepare for future regulatory changes. Should you have any interest or requirements, please feel free to contact us.

2. About the Lead-Free Alloy C6801

Material Properties

1. Chemical Composition (Comparison with C3604)　wt.%

Alloy	Cu	Pb	Fe	Fe+Sn	Bi	Cd	Zn
Standard C3604	57.0～61.0	1.8～3.7	0.5 or less	1.0 or less	-	Not Controlled	Balance
C3604 Cadmium-Free Material	57.0～61.0	1.8～3.7	0.5 or less	1.0 or less	-	Less than 75 ppm	Balance
C6801	59.0～60.0	0.01 or less	0.35 or less	0.6 or less	2.0～2.4	10ppm or less	Balance

* Balance indicates the remainder of the alloy composition.

2. Mechanical Properties (Comparison with C3604)

Alloy	Temper	Size	Tensile Strength N/mm2	0.2% Proof Stress N/mm2	Elongation %	Hardness HV (2/3r)
C3604	1/2H	Φ10	445	320	27	135
C6801	1/2H	Φ10	455	330	25	140

3. Physical Properties (Comparison with C3604)

Item	Unit	C3604	C6801
Specific Heat Capacity	J/(kg・K)	377	356
Specific Gravity	-	8.50	8.41
Thermal Conductivity	W/(m・K)	117	96.4
Coefficient of Linear Thermal Expansion	×10 -6/K	20.5	19.6
Young’s Modulus	kN/mm 2	96	101
Shear Modulus	kN/mm 2	36	(38)
Poisson’s Ratio	-	0.32	(0.33)
Electrical Conductivity	%IACS	26	24
Volume Resistivity	×10 -3/μΩ・m	66.3	72.4
Thermal Diffusivity	cm 2/sec	0.365	0.322
Impact Value	J	36.6	24.8