Hernon® Porosity Sealant (HPS) 41814 is the solution to leak-proof parts, improving machinability, in addition to increasing the durability and surface quality for painting and plating. The hardened resins exhibit superior chemical resistance and elevated temperature stability. The microscopic voids, where potential leaks occur (between metal grains or ceramic plastic molecules) in the part are filled by the low viscosity resin during vacuum application. Sealed micropores cure without shrinkage when exposed to an elevated temperature to form tough cross-linked thermoset polymer, permanently sealing the workpiece. The residual adhesive film is water washed from the part surfaces during rinsing. The parts leave the impregnating process without surface residue and can then be used in production immediately. When used in preparation for plating or painting processes, the impregnation process also eliminates absorption of plating materials (like acids) or painting prep solvents that could otherwise later bleed out of pores causing finishes to discolor, bleed, pit or peel. Sealed powdered metal parts exhibit better machinability, enhanced tool life, and better dimensional control.
• Single component
• Provides superior stability and reliability
• High speed processing, parts are ready in 30 minutes from floor to floor
• Reliability – Hardened resin exhibits superior chemical and physical, elevated temperature resistance and pressure sealability.
• A simplified process permitting the processing of treated parts: immediate painting or machining of impregnated parts is possible because HPS 41814 resin leaves no residue.
• Pneumatic tool castings
• Automotive carburetors
• Engine blocks
• Water and fuel pumps
• Plastic molds
• Valves, manifolds
• Railway, truck brake parts
• Hydraulic pumps
• Steering gear components
• Compressor parts
• Powdered metal gun parts
HPS 41814 should be stored in a cool, dry location in unopened containers at a temperature below 77ºF (25ºC). To prevent contamination of unused material, do not return any material to its original container. HPS 41814 in an active impregnation system with normal use has unlimited pot life if recommended controls are maintained, including temperature controls. Do not allow continuous exposure to ultraviolet light. HPS 41814 does not require aeration.
Directions for use:
HPS 41814 must be activated with Hernon® HPS Initiator 4322. Activate the resin as follows:
HPS 41814: 1 gallon
HPS Initiator 4322: 15.6 grams
Impregnation system reactivity is monitored by measurement of the Gel Time of a small controlled sample of resin taken from the system. The following operational parameters are presented as a “typical” scenario to assess cure rate of the impregnation process and system:
1. Keep Resin at temperatures between 50ºF-60ºF in Tank #1.
2. Gel Time @ 194ºF (90ºC) should be in the range of 3-5 minutes. HPS 41814 has been formulated to produce Gel Times in the 3-5 minute range @ 194ºF (90ºC). Should the Gel Time be below 5 minutes or above 10 minutes contact Hernon® Customer Service.
Cure Mechanism and Rate:
HPS 41814 cures to form a thermoset polymer when exposed to elevated temperature. Thermal content and coefficient of thermal transfer in the workpieces influence the cure rate of the HPS 41814 system. Higher temperatures produce quicker cure rates. HPS 41814 cures within the range of 177ºF (80ºC) to 205ºF (96ºC). Proper cure requires the workpiece to uniformly attain full cure temperature. Parts that do not transfer heat well will require longer processing times. Efficient thermal conductivity yields shorter processing cycles. Parts with heavier cross-sections require longer exposure to heat to attain sufficient temperature internally. Carefully consider part geometry.