Niplate® 500 PTFE – Electroless Nickel-PTFE

Niplate 500 PTFE is a composite high phosphorus (10-13%) electroless nickel plating containing 25-35% of PTFE particles.

Main properties of Nickel-PTFE

Low coefficient of friction and non-adhesion
Thanks to the high content of uniformly distributed PTFE particles, it possesses a high non-adhesion capacity and a very low friction coefficient (0.08 ÷ 0.12) in the absence of lubrication.

Uniform thickness
Uniform and constant thickness over the entire surface, including holes, ideal for precision mechanical engineering pieces with reduced tolerance.
Applicable on various metals
All the most common alloys used in mechanical engineering can be coated - iron, copper and aluminium alloys


Technical specifications

Composition and applicable standards

The Niplate 500 PTFE coating consists of two layers of identical thickness: the first layer is medium phosphorus electroless nickel, the second layer is high phosphorus electroless nickel with PTFE particles.
First layer
(40-60% of total thickness)
Ni P
91÷95% 5÷9%
Second layer
(40-60% of total thickness)
Matrix Particles
Ni P PTFE 300nm
87÷90% 10÷13% 25÷35% vol.
Composite coating with electroless nickel and PTFE particle matrix.

NSF-51 Certification
Certified NSF 51 - Food equipment material.

RoHS Conformity
RoHS conform. No restricted-use substances beyond maximum tolerated concentrations.

REACh Conformity
REACh conform. No SVHC in quantities greater than 0.1% by weight.

Coatable metals

Coatable metals
Iron alloys Pre-treatment Adhesion
Corrosion resistance
Carbon steel - ★★★★★ ★★★☆☆
Stainless steel Sandblasting ★★★★☆ ★★★★★
Case-hardened steel Sandblasting ★★★★☆ ★★★☆☆
Nitrided steel Sandblasting ★★★☆☆ ★★★☆☆
Copper alloys
Brass, Bronze, Copper - ★★★★★ ★★★★★
Aluminium alloys
Wrought alloys - ★★★★☆ ★★★★☆
Foundry and die-casting alloys - ★★★★☆ ★★★☆☆
Titanium alloys
Pure titanium and titanium alloys Sandblasting ★★★★☆ ★★★★★

Coating thickness and aesthetic appearance

Coating thickness
Typical thickness Tolerance
15 µm ±3µm
Uniform thickness over entire external and internal surface.
Absence of point effect typical of galvanic coatings.

Aesthetic appearance
Gunmetal grey metal appearance due to the high content of PTFE particles. Morphology similar to machined piece.
Matt finish option (sandblasted, shot peened or shotblasted).
In case of hardening at 270-280°C, discolouring of the layer could occur with possible brown halos.

Tribological properties

The surface hardness of Niplate 500 PTFE varies according to the hardening heat treatment performed after layer deposition.
Hardness value Heat treatment
250±50HV Dehydrogenation 160-180°C x 4 hrs
300±50HV Hardening 270-280°C x 8 hrs

Wear resistance
Niplate 500 PTFE has high wear resistance in non-abrasive conditions and in applications with low local loads.
It is not suitable for applications where types of abrasive wear exist. Hence with the Taber Abrasive test, wear values are high.
Approximate wear value, TWI-CS10 Heat treatment
A low number indicates a better performance - ASTM B733 X1 - Taber Abraser wear test - abrasive wheels CS 10 - load 1 kg
33±2 mg / 1000 cycles Dehydrogenation 160-180°C x 4 hrs
21±2 mg / 1000 cycles Hardening 270-280°C x 8 hrs

Friction coefficient
Dynamic dry friction coefficient value
0,08 ÷ 0,12 Thanks to the high content of PTFE particles Niplate 500 PTFE has a very low dynamic dry friction coefficient which usually varies between 0.08÷ 0.12 depending on the antagonist material.

Chemical properties

Corrosion resistance
The corrosion protection of Niplate 500 PTFE, assessed by means of salt mist test, depends on the base material, piece machining and finishing and the thickness of the applied coating.
Approximate corrosion resistance values Base material
NSS according to ISO 9227 - Thickness 20 μm - corroded surface < 5%
≥1000 hours Brass
≥240 hours Carbon steel
≥240 hours Aluminium 6082

Chemical resistance
Excellent chemical and oxidization resistance in many aggressive salt environments.
Passes concentrated nitric acid immersion test (RCA, Nitric acid test: Concentrated nitric acid 42Bé, 30 seconds, room temperature).
Chemical compatibility
Approximate values of compatibility with the coating environment only, they do not indicate corrosion protection of the base material. The overall performance of the coated piece depends to a large extent also on the type and quality of the base material. The actual resistance to the environment must in any case be tested in the field.
Hydrocarbons (e.g. petrol, diesel fuel, mineral oil, toluene)
Alcohols, ketones (e.g. ethanol, methanol, acetone)
Neutral saline solutions (e.g. sodium chloride, magnesium chloride, brine)
Diluted reducing acids (e.g. citric acid, oxalic acid)
Oxidizing acids (e.g. nitric acid)
Concentrated acids (e.g. sulphuric acid, hydrochloric acid)
Diluted bases (e.g. diluted sodium hydroxide)
Oxidizing bases (e.g. sodium hypochlorite)
Concentrated bases (e.g. concentrated sodium hydroxide)

Physical properties

Not braze weldable

Presence of ferromagnetism Heat treatment
Ferromagnetic Dehydrogenation 160-180°C x 4 hrs
Ferromagnetic Hardening 270-280°C x 8 hrs

Maximum continuous operating temperature

6.3 g/cm3

Production facility