Things to know 
Differences between Hot Isostatical Pressing (HIP) and Sinter HIP Procedure
In the powder metallurgical manufacturing process, and especially during sintering, porosity of hard metal cannot be excluded.

DIN ISO 4504 states that: -

 E.g. A02 = 0.02 vol. p.c. pores of up to 10 µm diameter
         B02 = 0.02 vol. p.c. pores of 10 – 25 µm diameter
         B00 = no pores in area 10 – 25 µm diameter

As voids, these pores can significantly affect the physical properties of the material, especially the rigidity module and the fatigue strength. This can lead to internal defects from where cracks can propagate. This applies particularly for manufactured parts which are being stressed in oscillation or otherwise.

By eliminating porosity, internal cracking can be avoided. Pores containing impurities, or where gas pockets remain, cannot be eliminated by pressure treatment and can remain thus leading to failure. To reduce porosity in Cemented Carbides two different procedures have been developed: -
Differences between Hot Isostatical Pressing (HIP) and Sinter HIP Procedure
Differences between Hot Isostatical and Sinter HIP
1. Hot Isostatical Pressure
2. Sinter HIP Procedure Pressure

Plunger, Packing, Lubricant – a complex tribological system in LDPE hyper compressors
1. Introduction Pressure
2. Elementary structure of a plant for high-pressure polymerization of ethylene
3. The tribological system
4. Wear process in the tribological system
5. Practical knowledge from a carbide metal producer’s point of view
6. Other partners of the tribological system
7. Outlook
8. Summary
9. Reference

1. Hot Isostatical Pressure