FREQUENTLY ASKED QUESTIONS


Q: Which alloy should I choose for the core?
A: Nozzle cores are manufactured from nickel silver (brass) or phosphor bronze. Both metals cold work during processing and produce rigid thin wall nozzle cores capable of resisting deformation under pressure.

Cores have equivalent wall thickness regardless of the metal used in the construction. Higher tensile strength metal increases strength of the core. Phosphor bronze has a slightly higher tensile strength than nickel silver. Nickel silver is more resistant to oxidation. Micro size cores are made from nickel silver.

Metal
Phosphor Bronze
Nickel Silver
UNS
C51000
C73500
Composition (%)
94.8% Cu, 5% Sn, 0.2% P
72% Cu, 10% Zn, 18% Ni
Tensile (ksi)
47-140
50-110
Yield ( ksi)
19-80
15-84
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Q: Why use coatings?
A: Coatings are used to impart a desirable property to the surface of the core. Cores can be coated with electroless nickel or entecoat. Inside diameter is reduced by approximately twice the thickness of the coating.

Class 2 electroless nickel can be applied on cores as small as 30 gage. The coating is bright, hard and resistant to abrasion.

Entecoat is a PTFE impregnated nickel coating that can be applied to any core. The coating is dark, lubricious, hard and abrasion resistant.

(See Nozzle Size and Application Guide)

Q: What is the coating tolerance for electroless nickel and entecoat?

A: Standard coating thickness tolerance is 0.0002-0.0004-inch per surface.

Q: Can you clean the nozzles?
A: The nozzles can be cleaned and reused at the customer's discretion.

Q: What are some standard core drawing tolerances?
A: Nozzle core run out is 0.002-inch full indicator movement.
Uncoated nozzle core aperture diameter can vary within 0.0006-inch range.
Nozzle core variation in length is within a range of 0.010-inch.

Q: Can other custom sizes be made?
A: Custom sizes can be made. Volume requirement must be substantial.

Q: Why are walls so thin?
A: Core walls are thin to produce the largest possible inside diameter for a standard medical tubing gage outside diameter. A thin wall minimizes area around the end of the tip of the core; this aids fluid break off, reduces propensity for wicking and enables delivery of fluid closer to the target.


Q: What does the nozzle fit?
A: Nozzles are designed to fit standard male luer type connections that comply with ISO 594 standard. Most syringe barrels use this connection.

Q: What is the advantage of a reusable hub and cores compared with assemblies?
A: Reusable hubs lower cost of the consumable core by reducing the number of process steps required for manufacture. Cores can use the hub as a source of thermal energy in service. Process waste is reduced; only the core is discarded.

Reusable hub and core seal and tighten more effectively against a male polymer taper. Assemblies seal well on both metal and polymer tapers. A: You can place an order by calling 760.436.1521 or email sales@subrex.com.

Q: What is the standard lead-time for in-stock items?
A: Typically 1-2 business days.