Industrial Pastes — Thread, Assembly and Anti-Seize

Thread pastes and anti-seize compounds that keep high-temperature joints free for the next maintenance window.

Quick Answer

Castrol Molub-Alloy assembly pastes — formerly sold as Castrol Optimol — for thread anti-seize, friction control and assembly work. Molub-Alloy Paste White T is the white assembly paste to 250°C, Paste MF runs to 1,100°C for screw connections and spark-plug threads, and Paste PL is the high-pressure grade for press fits and pressurised sliding points. Critical for stud and bolt threads exposed to corrosion or heat, where recovering a seized joint costs far more than the paste ever did.

Product Range

Molub-Alloy Paste MF

High-temperature paste

Synthetic carrier with temperature-stable solid lubricants, working range −40 to +1,100 °C. For high-temperature screw connections, spark-plug threads and Lambda-probe threads.

Molub-Alloy Paste White T

White assembly paste

Mineral and ester base, NLGI 1, working range −30 to +250 °C. Prevents fretting corrosion on screws, hinges, chucks and slide elements. No metal particles to stain the part.

Molub-Alloy Paste PL

High-pressure paste

Mineral base with bentonite and solid lubricants, NLGI 2, working range −40 to +450 °C. For press fits, tight fits, pressurised sliding points, slide bearings and gears.

Typical Applications

Turbine-stud and flange assembly
Exhaust-system fasteners
Press-fit shaft and bearing assembly
High-temperature threaded joints

Why buy from Vasundhara Specialities

As the authorised Castrol industrial distributor for Andhra Pradesh, every drum and pail we supply is sourced directly from Castrol India’s Silvassa, Paharpur and Patalganga plants with full batch traceability. Our Bhimavaram warehouse stocks the complete industrial pastes range for scheduled dispatch across AP, and our technical team is available on-site for application trials, coolant sampling, and training. Paired with our CoolantCare fluid management programme, you get not just a supplier but a lubrication partner committed to lowering your total cost of lubrication.

Frequently Asked Questions

I have Optimol on my drawing — what do I order now?

Castrol’s paste range is now branded Molub-Alloy: Paste PL, Paste White T and Paste MF. Send us the Optimol code from the drawing or bin card and we will come back with the current equivalent, confirmed against the product data sheet. Molub-Alloy also covers high-performance greases — 936, 777 and 8000 for mining and open-gear service — on our Tribol and Molub-Alloy page.

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Frequently asked questions

Can I use copper anti-seize on stainless steel?

Yes for non-critical joints. For pharmaceutical, food-contact, or pure-stainless applications, use a nickel-based anti-seize instead to avoid galvanic issues.