DZR Brass Parts and DZR Brass Components – Manufacturer from India

Brass & Copper Parts India is a leading manufacturer of DZR brass parts and DZR brass components — dezincification-resistant brass fittings, valves, adapters, and machined parts specifically engineered for potable water, gas, and industrial applications in the USA and global markets. Our DZR brass components are manufactured in Jamnagar, India, to BS EN 12165, BS EN 12164, ASTM B283, and WRAS/NSF/ANSI 61 standards.

What Is DZR Brass?

DZR stands for Dezincification Resistant brass. Standard brass alloys containing more than 15% zinc are susceptible to a corrosion mechanism called dezincification, where zinc selectively leaches out of the brass matrix in aggressive water conditions (soft water, high chloride, elevated temperature). This leaves behind a porous, weak copper-rich layer that can cause fittings to fail suddenly.

DZR brass alloys are specifically formulated with small additions of arsenic (typically 0.02–0.06%) or antimony, which inhibit the dezincification mechanism. DZR brass passes the ISO 6509 dezincification resistance test (depth of attack ≤200 µm after 24 hours in 1% CuCl₂ at 75°C). DZR brass is mandated for plumbing fittings in many US jurisdictions, the UK (WRAS approved), Australia, and Europe wherever water quality poses a dezincification risk.

Types of DZR Brass Parts We Manufacture

DZR Brass Plumbing Fittings

CNC-machined DZR brass fittings for domestic and commercial plumbing: compression fittings, push-fit connectors, elbow fittings, tee fittings, reducers, and unions. Compatible with copper tube (ASTM B88), PEX (ASTM F876), and CPVC piping systems.

DZR Brass Valve Bodies and Inserts

Precision-machined DZR brass valve bodies, ball valve cores, gate valve bonnets, and butterfly valve inserts for potable water and industrial gas service. All valve bodies are hydrostatically tested to 1.5× working pressure before dispatch.

DZR Brass Gas Fittings

DZR brass fittings for natural gas, LPG, and propane service — including meter unions, regulators bodies, manifold fittings, and compression connectors to ANSI/AGA and CSA standards. Gas-rated DZR brass fittings are leak-tested with nitrogen before packaging.

DZR Brass Hose Connectors and Nipples

Male and female hose nipples, garden hose connectors, quick-coupling inserts, and barbed fittings in DZR brass for outdoor water supply, irrigation, and garden equipment markets.

DZR Brass Precision Machined Inserts

Threaded inserts, anchoring devices, heat-staked inserts, and press-fit components in DZR brass for plastic injection molding and composite assemblies — ensuring dezincification resistance in water-contact plastic-metal assemblies.

DZR Brass Alloy Grades – International Equivalents

Alloy Name	UNS (USA)	EN (Europe)	BS (UK)	DIN (Germany)	IS (India)	Composition	Standard
DZR Brass (As-inhibited)	C35330	CW602N	CZ132	CuZn36Pb2As	—	Cu 62%, Zn 36%, Pb 2%, As 0.04%	BS EN 12164/12165
DZR Brass Low-Lead	C35000	CW600N	CZ130	CuZn38Pb0.5As	—	Cu 60%, Zn 39.5%, Pb 0.5%, As 0.04%	EN 1254
DZR Forging Brass	C37700	CW617N	CZ122	CuZn39Pb2	IS 291	Cu 60%, Zn 38%, Pb 2% + As	ASTM B124/B283
Lead-Free DZR Brass	C87850	CW511L	—	CuZn21Si3P	—	Cu 76%, Zn 21%, Si 3%, As trace	NSF/ANSI 61, AB1953

DZR Compliance Testing and Standards

• ISO 6509: Dezincification resistance test — depth of attack ≤200 µm
• WRAS (UK): Water Regulations Advisory Scheme approval for potable water fittings
• NSF/ANSI 61: US standard for drinking water system components (lead-free requirement ≤0.25% Pb)
• California AB1953 / Vermont S.152: US “lead-free” plumbing law compliance
• ASTM B283: Standard for copper alloy die forgings (for DZR forged fittings)
• BS EN 12165: Wrought copper alloys — rods and bars for DZR components

Why Choose Brass & Copper Parts India for DZR Brass Parts?

• DZR expertise: Dedicated DZR brass machining line using verified DZR-grade rods certified to BS EN 12165 / CW602N
• In-house dezincification testing: ISO 6509 test capability with independent lab certification
• NSF/ANSI 61 awareness: Lead-free DZR brass available for California, Vermont, and US federal compliance
• WRAS compliance support: Components manufactured to specs acceptable for WRAS-approved system assembly
• High-volume CNC machining: Multi-spindle and Swiss-type turning for millions of pieces per year
• Custom part design: Engineering support for DZR brass part optimization
• Competitive pricing: 35–50% savings vs. European DZR brass manufacturers

Frequently Asked Questions — DZR Brass Parts

Q1: What is dezincification and why is it a problem in brass?

Dezincification is a selective corrosion process where zinc is leached from the brass matrix in soft, slightly acidic, or chlorinated water, leaving a porous, copper-rich sponge that has lost its mechanical strength and pressure integrity. Standard brass (60 to 40 percent Cu-Zn) is susceptible in hot water systems, especially where water pH is below 7.5 or where chlorides are present. Dezincification is the primary reason for premature failure of standard brass fittings in plumbing systems.

Q2: What makes DZR brass resistant to dezincification?

DZR (Dezincification Resistant) brass contains a small addition of arsenic (0.02 to 0.06 percent) or antimony or phosphorus, which inhibits the zinc-selective dissolution mechanism. The microstructure is controlled to avoid free-beta phase (which is most vulnerable to dezincification) by keeping zinc content below 38 percent. DZR brass conforms to BS EN 12165 (CW602N) and is classified as DZR when tested per BS ISO 6509 (dezincification resistance test in 1% CuCl2 solution).

Q3: When is DZR brass required by code or regulation?

In the United Kingdom, Water Supply (Water Fittings) Regulations 1999 (Water Regulations) require DZR brass for fittings in hot water systems and for any brass component where flow velocity is below 0.3 m/s or water is stagnant. WRAS (Water Regulations Advisory Scheme) approval is the UK certification for DZR fittings. In the USA, several state and local codes reference AWWA standards that require dezincification-resistant materials for water utility fittings. Australia requires dezincification-resistant alloys per AS 1866 for hot water plumbing.

Q4: What is the WRAS approval process for DZR brass components?

WRAS (Water Regulations Advisory Scheme) approval for DZR brass components requires: alloy conformance to BS EN 12165 CW602N, dezincification test per BS ISO 6509 with maximum dezincification depth of 200 microns, and finished product testing for effect on water quality per BS 6920. We supply CW602N alloy with dezincification test certificates as the base material. Final WRAS product approval is obtained by the fitting manufacturer (our customer) who submits the complete fitting assembly for testing.

Q5: What is the UNS designation for DZR brass?

DZR brass (CW602N per EN, LG2 per BS) corresponds approximately to UNS C35330 (low-lead arsenical brass) in the ASTM/UNS system. C35330 contains 0.02 to 0.06 percent arsenic as the dezincification inhibitor. For machined components, the bar stock is sourced per ASTM B453 (leaded brass rod) in the closest US-standard alloy, with dezincification resistance confirmed by test certificate.

Q6: Is DZR brass lead-free?

Standard DZR brass CW602N contains approximately 1.5 to 2.5 percent lead, which is not compliant with US NSF 372 low-lead (0.25 percent weighted average maximum) and California AB 1953 requirements for potable water fittings. Lead-free DZR alternatives include bismuth-brass (C89833) and silicon-brass alloys that provide dezincification resistance without lead content. We can supply both standard DZR CW602N and lead-free DZR alloys depending on the regulatory requirement.

Q7: What machined components do you produce in DZR brass?

We machine a wide range of DZR brass components including valve bodies, gate valve plugs, ball valve balls and seats, union fittings, elbow fittings, compression fittings, meter bodies, backflow preventer components, manifold blocks, and irrigation system parts. DZR brass is standard for any fitting where hot water contact, low-velocity stagnant water conditions, or regulatory requirement applies.

Q8: How does DZR brass compare to bronze for plumbing applications?

DZR brass offers better machinability (free-machining variants at 100 on the machinability index vs. 20 to 30 for LG2 bronze) and lower material cost than bronze, while providing adequate dezincification resistance for most plumbing applications. LG2 bronze provides superior corrosion resistance in seawater and aggressive chemical environments and is preferred for high-pressure industrial fittings and marine hardware. For typical residential and commercial plumbing, DZR brass is the cost-effective and code-compliant choice.

Q9: What quality testing is done on DZR brass machined parts?

Quality testing for DZR brass parts includes: dimensional inspection per drawing (CMM or optical comparator), alloy verification by XRF (X-ray fluorescence) analysis to confirm arsenic content and zinc level, dezincification resistance test per BS ISO 6509 (1% CuCl2 at 75 degrees Celsius for 24 hours, maximum dezincification depth 200 microns), and pressure testing for hollow components. Test certificates are supplied with each shipment.

Q10: What lead time should I expect for DZR brass machined parts?

Standard DZR brass (CW602N) bar is held in stock in our facility for fast turnaround. Lead times: prototypes and samples (1 to 10 pieces): 7 to 10 working days. Production orders (500 to 5000 pieces): 2 to 4 weeks. Complex multi-operation valve bodies: 4 to 6 weeks. Air freight to the USA: 3 to 5 days. We maintain safety stock of common sizes for emergency orders.