What size of porosity can be sealed?


Porosities Can Be Micro Or Macro In Size, Which Causes Gas Or Fluid To Pass Through. The Impregnation Sealant Is Only For Such Porosities And Not For Major Casting Defects, Casting Cracks, And Large-Diameter Blow Holes. A Porosity Is Like A Cobweb Structure And Not A Through-Hole. So, It Is Tough To Difficult The Porosity Size That Can Be Sealed. A Normal Thumb Rule Is That A Porosity Of Size 300 Microns Can Be Sealed.

However, A Porosity Of More Than 300 Microns Can Also Be Sealed Depending On The Metal Structure And The Porosity Nature. The Porosity Size That Can Be Sealed Depends On The Method Of Retaining The Sealant In The Porosity. In Case Of Large Porosities, Some Procedures Exist To Retain The Sealant.

If An Impregnation Chamber Is Completely Filled With Sealant And Heated, The Sealant Will Polymerize Into A Hard Plastic Of Two Meters’ Diameter. However, We Do Not Need To Seal Porosities About Two Meters In Diameter As They Never Exist.

Following Are Some Unusual Procedures Typically Used To Hold Sealants In Porosities For High-Value, Low-Volume Applications:

• Cover Large Surface Porosities With Clay Or Plastercene
• Rub Chalk In Surface Porosities As Filler
Porosity Sizes That Should Be Sealed

Vacuum Impregnation Does Not Alter The Mechanical Strength, Structure, Shape, Size, Dimensions, Or Appearance Of A Casting. In Most Cases, The Customer Can Decide Whether A Component Is Made Weak By A Casting Defect, Whether A Casting Defect Has An Impact On The Casting’s Mechanical Properties, And
Whether The Casting Should Be Impregnated And Used.

The Customer Should Decide Whether Porosity Is Detrimental To The Mechanical Structure Of The Casting And The Porosity’s Effect On The Casting Soundness In Terms Of Size And Shape. Impregnation Is Not For Cosmetic Appearance. Large Surface Porosities Related To Cosmetic Appearance Can Be Filled With Sealants By One Of The Above Procedures.

Comments

  1. kunalSeptember 23, 2019 at 4:00 AM

    Thank you for the blog. This is very nice and easy to understad.

    AR Engineering is a company founded by Mr. Arvind Mutalik in 1988, for manufacturing of transformer oil filtration machines. Since then AR Engineering has developed different types of Insulating Oil upgrading systems suitable for in-house and onsite operation.

    Vacuum Pressure Impregnation Plant
    Vacuum Pressure Impregnation (VPI) is a process that uses vacuum and pressure to seal porous materials with varnish or resin. The process is used primarily for high-voltage motors and generators to fill gaps in materials to create a void free insulation in various devices.

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