Full-fusion

Plastisols may also be semi-geUed for storage, ie, enough heat is imparted to convert the plastisol into a soHd but without the full development of tensile properties brought about by full fusion. 

Pressure-containing welds, including welds of the case to horizontal and vertical joint flanges, shall be full-fusion, full-penetration welds. 

Attachment of suction and discharge nozzles shall be by means of full-fusion, full-penetration welds. Weld neck flanges are required for pumps handling flammable or hazardous liquids. Dissimilar metal weldments are not allowed. 

Processing for dispersion systems (plastisols) involves putting the liquid in the right place, having it stay there, heating so as to swell the polymer particles and create a gel, and then heating to full fusion. When fully fused, despite the lack of mechanical shear there is intimate polymer chain and plasticizer interaction and full mechanical strength has been reached. 

Amatore, C., Arbault, S., Bonifas, I. et al. 2003. Dynamics of full fusion during vesicular exocytotic events Release of adrenaline by chromaffin cells ChemPhysChem 4 147-154. 

Amatore, C., Oleinick, A. I., Svir, 1. 2010. Reconstruction of aperture functions during full fusion in vesicular exocytosis of neurotransmitters. ChemPhysChem 11 159-174. 

---