MOLYKOTE HSC Plus Paste – High-Temperature Anti-Seize Lubricant

MOLYKOTE HSC Plus Paste is a high-performance, solid-lubricant paste developed for metal-to-metal assemblies that experience high temperatures, heavy loads, friction and corrosive conditions. Manufactured by DuPont under the MOLYKOTE brand, it is formulated for applications that require controlled friction, reliable assembly and the ability to dismantle components after prolonged high-temperature service.

This copper-coloured paste contains mineral oil and solid lubricants, including copper and molybdenum disulfide. The manufacturer describes it as containing no intentionally added lead or nickel. Its properties make it suitable for specified threaded fasteners, stud bolts and flange connections in industrial environments.

Key Features of MOLYKOTE HSC Plus Paste

1. High-Temperature Performance

MOLYKOTE HSC Plus Paste is specified for a broad temperature range of −30°C to +1,100°C. This upper limit relates to the manufacturer’s stated operating range for the solid-lubricant system; it should not be interpreted as a guarantee that every component or the entire paste formulation remains unchanged at 1,100°C.

The paste is intended for metal assemblies where high temperatures and friction can make later disassembly difficult. Always confirm suitability against the component material, load, assembly design and operating conditions.

2. High Load-Carrying Capacity

The solid-lubricant formulation is designed for heavily loaded metal-to-metal contact points. The manufacturer reports high load-carrying performance, making the product relevant to specified bolted joints and industrial assemblies where contact pressure and friction must be managed.

Use the lubricant specified by the equipment or engineering documentation, especially for safety-critical fasteners.

3. Controlled Friction for Bolted Joints

MOLYKOTE HSC Plus Paste has a defined friction profile intended to support predictable tightening and preload in bolted connections when the relevant assembly procedure accounts for the lubricant. Applying a lubricant can change the relationship between tightening torque and bolt tension, so torque specifications must be appropriate for lubricated fasteners.

Do not apply the paste to a fastener and then use a dry-fastener torque value unless the engineering instructions explicitly allow it.

4. Corrosion Protection and Easier Disassembly

The paste provides corrosion protection and helps reduce the risk of components becoming difficult to separate after prolonged service at elevated temperatures. This can be valuable during planned maintenance, inspections and equipment overhauls.

The degree of protection depends on the service environment, joint design, surface condition and maintenance interval.

5. Lead-Free and Nickel-Free Formulation Claim

DuPont describes MOLYKOTE HSC Plus Paste as containing no intentionally added lead or nickel. This wording is more precise than claiming the product is guaranteed to contain absolutely zero traces of either metal. Refer to the manufacturer’s current documentation if your project requires formal material declarations or compliance verification.

6. Electrical Conductivity

The manufacturer identifies good electrical conductivity as a product feature and lists use as a contact lubricant for electrically conducting components. Confirm suitability for the specific electrical connection and contact design before application.

Typical Applications

MOLYKOTE HSC Plus Paste is intended for suitable metal-to-metal assemblies, particularly those exposed to high temperatures, loads or corrosive conditions. Manufacturer-listed applications include:

• Stud bolts in industrial gas and steam turbines
• Stud bolts in diesel-engine turbochargers
• Flanged connections in chemical and petrochemical plants
• Specified threaded fasteners exposed to high temperatures
• Metal contact points requiring a controlled friction coefficient
• Electrically conducting components where a compatible contact lubricant is specified
• Industrial equipment assemblies that may need to be dismantled after extended service

Always verify compatibility with the base metal, fastener coating and assembly design before use.

Application Instructions

Before applying MOLYKOTE HSC Plus Paste, clean the threads and contact surfaces as required by the equipment manufacturer’s instructions. The DuPont technical data sheet recommends cleaning used bolts with a wire brush where appropriate.

Spread a suitable amount of paste over the specified contact surfaces to obtain the intended coverage. The manufacturer states that excess paste is not harmful in its recommended applications, but the actual quantity should still follow the joint design and assembly instructions.

Do not mix the product with other greases or oils, as this may change its properties. For larger areas or faster application, DuPont also offers a separate HSC Plus Paste Spray product. The paste and aerosol versions should not be treated as identical packaging or application formats.

Technical Characteristics

The manufacturer’s technical data lists a copper colour, a density of approximately 1.4 g/ml at 20°C and an unworked penetration of 250–280 (0.1 mm units). The data sheet also reports a weld load of 4,800 N in the specified four-ball test and a thread friction coefficient of 0.14 under the stated screw-test conditions.

These are typical laboratory values, not universal performance guarantees. Use the current technical data sheet and the relevant engineering specification when selecting the product for a critical assembly.

Ordering MOLYKOTE HSC Plus Paste

Order MOLYKOTE HSC Plus Paste from Technosteer Online for suitable high-temperature assembly, anti-seize and industrial maintenance requirements.

The manufacturer lists 1 kg cans and 5 kg pails on its US product page, with other pack sizes listed in some regional markets. Confirm the exact size, regional product variant and availability before placing your order.

For turbine fasteners, petrochemical flange connections and other critical bolted joints, follow the equipment manufacturer’s assembly procedure and use torque or preload specifications that account for the lubricant.