RVT Process Equipment GmbH supplies the following tray types in plastic:

• Sieve trays
• Dual-flow trays
• tunnel trays

The sieve trays are very cost-competitive mass transfer trays. The operating range of these sieve perforated trays is less than that of valve trays.

The tunnel tray type is mainly used for applications with low liquid loadings, liquid sealings, well proven in acid recovery specifications and in cases where there a stable liquid holdup is required.

• Application for low liquid loadings
• Liquid sealed
• Well proven in acid recovery applications
• Mainly applied when a steady liquid hold up is required.

Applications and properties of the plastics for trays:

Designation	Properties	Resistance to	Upper working temperature
PVC	hard and stiff thermoplastic, used at moderate temperatures	Alkalis, acids, salt solutions, oils, greases, petrol, aliphatic hydrocarbons	approx. + 60°C
PE	tough, firm plastic, also used at minus temperatures, low water absorption	Alkalis, acids, salt solutions, many organic solvents like alcohols, ketones, ester	approx. +60°C
PP	hardness and stiffness higher than PE, but inadequate toughness at low temperatures, higher operating temperature than PE	Alkalis, acids, salt solutions we well as many organic solvents like alcohols, ketones, ester	approx. +80°C
PVDF	Fluoride-containing thermoplast, good resistance to heat and cold	Alkalis, acids, salt solutions, many organic solvents like alcohols ketones, esters, nitric acid, H2O2	approx. +120°C
PTFE	very good ability to withstand temperature, stiffness values reduced, high creep tendency	almost all chemicals	approx. +180°C
TFM	very good ability to withstand temperature, stiffness values reduced, high creep tendency, weldable	almost all chemicals	approx. +180°C