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RAMCO Spra-Gard - Model PPL -Safety Spray Shields– Flange
This shield was developed by RAMCO for a very specific application. Unlike the TFE Spra-Gard Shield that contains fiberglass, the PPL shield can be used to protect against hydrofluoric acid, a highly virulent chemical that is used to etch glass and is also employed in petroleum cracking operations. Recognizing that the PPL Spra-Gard Shield provided the first practical safeguard against this hazardous acid, RAMCO received the John C. Vaaler Award in 1978.
While the PPL Spra-Gard Shield was initially “application specific”, the most valuable property of PPL is versatility. This thermoplastic cloth demonstrates temperature and pressure resistance up to 225°F(107°C) and 1100 psi (76 bar), respectively; its chemical tolerance is greatly affected by concentration. For example, at sulfuric acid concentrations of 30% or less, PPL Spra-Gard Shields are recommended up to line temperatures of 200°F (93°C). However, with 93% or 98% concentrations its use is limited to systems with ambient temperatures.