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HI-KOTE™ NC COATINGS

The HI-KOTE™ coating technology provides the aerospace fasteners industry with high performance. This family of coatings has been part of the HI-SHEAR range for more than 30 years. It is used on millions of fasteners, across hundreds of programs worldwide. LISI AEROSPACE has made some large investment in R&D and after more than 8 years of intensive research we are proud to offer the new “green” HI-KOTE™ 1 NC and HI-KOTE™ 4 NC coatings. These coatings are delivering the same high performance and comply with the latest environmental requirements, making them the worthy successors of our well known HI-KOTE™ 1 and HI-KOTE™ 2 first generation coatings.

GENERAL PRESENTATION

DESCRIPTION OF HI-KOTE™ NC COATINGS

HI-KOTE™ NC coatings are aluminum filled phenolic resin formulations developed to yield a permanent bonded dry film 5 to 13 µm thick. The chromate free corrosion inhibitors incorporated into the HI-KOTE™ NC coatings system provides corrosion protection for the assembly in which the fasteners are installed.

BENEFITS AND KEY PROPERTIES

SUBSTRATE Titanium alloys, Corrosion Resistant Steel (CRES) and nickel based alloys such as Inconel™718

GALVANIC CORROSION PROTECTION Prevents galvanic corrosion between fasteners and aluminum alloy structures

LUBRICATING PROPERTIES Reduces friction in threads and interference fit assemblies

RESISTANCE TO CHEMICALS Resistant to aggressive chemicals (paint strippers, jet fuel, hydraulic fluids, cleaning solvents)

STRONG ADHESION TO SUBSTRATE

Provide ductility which prevents cracking caused by part expansion, contraction of the substrate or shock

EXCELLENT AIRCRAFT PAINT ADHESION Improves aircraft external paint adhesion on fastener heads

NO HYDROGEN EMBRITTLEMENT Eliminates potential for hydrogen embrittlement by the method of application

25000

30000

35000

40000

Insertion Loads on bolts coated with Hi-KoteTM 1 and Hi-KoteTM 1 NC productsThree 1/2 inch diameter Pull-Stem Bolts tested for each coating – Interference fit : 145 µm

0

5000

10000

15000

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Load

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Displacement (mm)

Hi-KoteTM 1 NC

Hi-KoteTM 1

Maximum Load per EN4473

HI-KOTE™ 1 NC COATING

HI-KOTE™ 1 NC coating is a direct replacement of chromate HI-KOTE™ 1 coating for pins, lockbolts, nuts, collars or other components. Often combined with cetyl alcohol, HI-KOTE™ 1 NC coating is particularly recommended for interference fit assemblies.

HI-KOTE™ 1 NC coating meets the following aerospace specifications requirements :

BMS 10-85 Boeing Material SpecificationEN 4473 type II European ASD-STAN StandardNAS 4006 National Aerospace Standard HS294 LISI AEROSPACE HI-SHEAR standard

HI-KOTE™ 1 NC coating demonstrates outstanding frictional performance in high interference assembly as per EN4473 standard.

DECREASES INSTALLATION LOADS IN INTERFERENCE FIT ASSEMBLIES

PROTECTION AGAINST GALVANIC CORROSION OF AIRCRAFT STRUCTURES

HI-KOTE™ NC coatings composition prevents the galvanic corrosion of aluminum alloy structures in contact with titanium alloys, Corrosion Resistant Steel (CRES) or nickel based alloys fasteners.

BARE FASTENER

Ti/CRES /Inconel

GalvanicCorrosion

No GalvanicCorrosion

HI-KOTE™ NC COATED FASTENER

HI-KOTE™ NC coating

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HI-KOTETM 2

HI-KOTETM 4NC

MOLYKOTETM 3400A Aero

TIOLUBETM 460

EVOLUTION OF PRELOAD ON 15 TIGHTENING CYCLES(1/4 inch diameter CRES collars with HI-KOTE

TM

4NC and MoS2 DFLtightened on SAA treated Titanium Test Bolts at 9 N.m)

HI-KOTE™ 4 NC COATING

HI-KOTE™ 4 NC coating has the same properties as HI-KOTE™ 1 NC coating, but contains additional lubricating agents in the formulation in order to avoid the use of a secondary lubricant. HI-KOTE™ 4 NC coating has proved very successful as a new “green” coating solution for nuts, but this coating can also be used without cetyl alcohol on pins/rivets for medium-low interference fit application. HI-KOTE™ 4 NC coating is an excellent REACH compliant alternative to first generation chromate HI-KOTE™ 2 coating and MoS2 based Solid Film lubricant which contain heavy metals such as lead and/or antimony.

HI-KOTE™ 4 NC coating meets the following aerospace specifications requirements:

BMS 10-85 Boeing Material SpecificationsEN 4473 type IV European ASD-STAN StandardNAS 4006 National Aerospace Standard HS294 LISI AEROSPACE HI-SHEAR standard

FRICTIONAL PERFORMANCE EQUIVALENT TO MoS2 BASED LUBRICANTS

HI-KOTE™ 4 NC coating shows frictional performance equivalent to widely used MoS2 based dry film lubricants such as MOLYKOTE™ 3400A Aero, TIOLUBE™ 460 and HI-KOTE™ 2 coating.

DISTRIBUTION AND QUALIFIED APPLICATORS

HI-KOTE™ coatings by LISI AEROSPACE are available in the USA from Torrance (HI-SHEAR CORP) and in Europe from Saint-Ouen-L’Aumône, Paris (BLANC AERO INDUSTRIES).

LISI AEROSPACE has implemented a licensing and qualification system to ensure constant high performance and quality control for all products coated with HI-KOTE™ coatings. Please contact LISI AEROSPACE to become a licensee for in house application or choose to use one of our qualified applicators.

The list of qualified applicators is available on LISI AEROSPACE website.

HI-KOTE™ NC COATINGS NEW GREEN ALTERNATIVES TO FIRST GENERATION HI-KOTE™ COATINGS

HI-KOTE™ REFERENCE USAGE

First Generation

• General use for various fasteners

• Often combined with cetyl alcohol

• Solid Film Lubricant

New Generation

• Direct Chromate free replacement of HI-KOTE™ 1 coating

• Enhanced lubrication for use without cetyl alcohol

• Alternative to chromate HI-KOTE™ 2 coating and MoS2 based Solid Film Lubricant

HI-KOTE™ is a trademark of HI-SHEAR Corp.

Inconel™ is a trademark of Special Metals Corp.

MOLYKOTE™ is a trademark of DOWN CORNING Corp.

TIOLUBE™ is a trademark of TIODIZE Co, Inc.

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LISI

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LISI AEROSPACE46-50 Quai de la Râpée - CS 1123375583 Paris Cedex 12 - FRANCETel. +33 (0)1 40 19 82 00Fax +33 (0)1 40 19 82 01

Find your LISI AEROSPACE contact at: www.lisi-aerospace.com

Our locations worldwide

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