RectorSeal, 25551, Thread Sealant, Can, 1/2 pt, Yellow , Paste, 1.38

25551 RectorSeal® No. 5 Multi-Purpose Pipe Thread Sealant – 1/2 Pint

RectorSeal® No. 5 is a soft-set, slow-drying thread sealant formulated for sealing, lubricating, and protecting threaded connections in industrial, mechanical, and plumbing systems. Developed with an oleoresinous base, the compound provides a reliable, pressure-tight seal while maintaining flexibility for easy disassembly and service. It is suitable for a broad range of fluids and gases, including potable water, natural gas, air, and steam, and is compatible with both metallic and select nonmetallic piping systems.

Technical Specifications

• Model: 25551
• Manufacturer: RectorSeal®
• Product Name: No. 5 Multi-Purpose Pipe Thread Sealant
• Form: Soft-Set Paste
• Base Material: Oleoresinous Compound
• Composition: Diacetone Alcohol and Oleoresinous Additives
• Color: Yellow
• Container Type: Can
• Container Size: 1/2 Pint
• Coverage: Approximately 0.44 cu-ft
• Specific Gravity: 1.38
• VOC Content: 317 g/L
• Flash Point: 150°F (65°C)
• Flammability Rating: 2 (NFPA Classification)
• Temperature Range: -40°F to 125°F (-40°C to 52°C)
• Drying Characteristics: Slow-Drying, Non-Hardening
• Pressure Rating: Immediate pressurization up to 100 PSI for pipe sizes ≤ 2″ (natural gas, air, and water applications)
• Applicable Materials: Steel, Iron, Brass, Copper, Aluminum, Stainless Steel, Polyethylene, Fiberglass-Reinforced Pipe, PVC
• Not Recommended For: ABS, CPVC, Oxygen, Chlorine, or Other Oxidizing Agents
• Odor: Mild
• Classification: Consumer Commodity ORM-D
• Application Type: Threaded Joint Sealing in Plumbing, HVAC, Gas, and Process Piping Systems

Professional Notes

RectorSeal® No. 5 is engineered to provide long-term sealing reliability and joint integrity across varying service pressures and temperatures. The compound’s lubricating properties minimize thread galling and ensure consistent torque during assembly. Its soft-set formulation remains flexible after curing, allowing for joint realignment or system maintenance without thread damage. The sealant supports immediate pressurization in low-pressure systems and is effective across a wide range of compatible fluids and gases. Its stable composition provides corrosion resistance and maintains sealing performance under vibration and thermal cycling.

Summary

The RectorSeal® No. 5 Multi-Purpose Pipe Thread Sealant (25551) offers professional-grade sealing performance for threaded metal and compatible plastic piping systems. Its oleoresinous, non-hardening formulation ensures dependable sealing, corrosion protection, and serviceability in industrial, mechanical, and plumbing environments. With proven compatibility, ease of application, and consistent sealing integrity, RectorSeal® No. 5 remains a standard choice for contractors and field technicians across multiple service disciplines.