A phase transfer catalyst is a type of chemical compound. It is a quaternary ammonium salt, which facilitates the migration of a particular chemical component in one phase into another phase in a heterogeneous system. The chemical component is soluble in one phase but insoluble in the other unless the phase transfer catalyst is present. A phase transfer catalysts works by encapsulating the ion. The PTC-ion system has a hydrophilic interior containing the ion and a hydrophobic exterior. Crown ethers are also efficient phase transfer catalysts.
Phase-shifting stroboscope contains dual-function delays in external mode. Delays adjustable as phase angle or time - resolution to 0.01° and 0.0001 seconds. An auto flash intensity maximizes brightness through entire range. The non-volatile memory stores and recalls three full settings & last measurement. Auto blanking allows use of standard optical sensors in most applications without flash re-triggering. It operates continuously from internal rechargeable batteries or line power.
Phenolic Canvas Wheels are industry standard performer. It is made from heavy weave canvas duck, impregnated with phenolic resin. It is molded under high pressure and temperature. Its hardness is comparable to polished maple flooring. It is used for smooth concrete or wood floors, and storage (standing) loads without permanent set. It rolls easily, quietly and protects the floor. It resists shock, water and oil. It has roller bearings.
Phenolic coatings are chemical resistant coatings used where low pH and higher temperatures are present. Phenolic coatings are used for electrical insulation, impregnating varnishes, and chemical-resistant coatings. The phenolic coatings used to protect the steel of railway tanks during the shipment of concentrated sulpuric acid.