A proprietary mould treatment which delays the hardening of cement in contact with it so that the surface can be washed once demoulded to expose the aggregate. Retarders are available in colour coded grades to give progressive retarding effect.
Added to acrylic paint to delay the drying process. Also used in place of water to achieve more even strokes. (Note: Overuse of retarder can impair the quality of the paint).
A device which is laid close to the running rails of certain tracks in a hump yard, and when operated applies a retarding force to slow the speed of passing wagons.
Solvent added to a paint to slow down its evaporation rate.
Braking system usually found in hump yards. Commonly pneumatically actuated, located on inside of rail, forcing a brake pad against the inside of the wheel flange, "pinching" the flange between the brake pad and the rail.
A device for slowing the movement of cars being switched in a hump yard.
a device for slowing down lorries , coaches and other vehicles
an auxiliary braking device designed to assist in decreasing vehicle speed
A slow drying solvent used to slow down evaporation and hence slow the drying of a paint coat.
A solvent that is slow evaporating, used as an additive to slow down the drying of a coating. Used to improve flow out, or to avoid blushing.
An additive used to increase the open (drying) time of acrylic paints. Useful for "wet in wet" techniques and reducing skinning on the palette.
Additive that slows the drying time of a coating material, usually a slow drying (high boiling) solvent.
admixture used to slow down the hydration rate to allow more time for stamping. Add on site to implement "step retardation."
An ink additive used to change the viscosity of an ink and to alter the drying time.
A metal grip adjacent to the rail, usually operated by compressed air or electrical motors, for regulating speed of a car by pressure on the wheels while rolling down a hump incline.
A slowly evaporating solvent that decreases the evaporation rate or slows up the drying of lacquers and similar materials.
A medium added to paint to slow its drying time or make a color more transparent without watering down the color. Also called "extender".
additive that slows the drying properties of inks as well as slowing solvent flash-off time.
A slow evaporating solvent which slows the drying rate of a paint material in order to improve the application properties.
Device used to assist brakes in slowing the vehicle. The most common type of retarder on over-the-road trucks manipulates the engine's valves to create engine drag. (This type is commonly referred to as "Jake Brake" because the predominant manufacturer is Jacobs Vehicle Equipment Co.) Other types of retarders include exhaust retarders, transmission-mounted hydraulic retarders and axle-mounted electromagnetic retarders.
Device which multiplies the braking effect of the engine; are sometimes installed in the driveline of the vehicle; also, a special feature of Transmatic Drive, is a built-in retarder which is pedal-controlled and multiplies engine braking up to 6 times; also Diesel engine-mounted device which cuts off fuel and delays exhaust valve opening to increase engine braking.
A mechanical device usually located in a hump yard, used to slow rolling stock to a safe coupling speed, similar to the hand brakes on a bicycle.
A retarder is a chemical agent that slows down a chemical reaction. For example, retarders are used to slow the chemical hardening of plastic materials such as concrete, and adhesives.
A retarder is a device used to augment or replace some of the functions of primary friction-based braking systems of (usually) heavy vehicles.
In rail transport, a retarder is a device installed in a classification yard used to slow the speed of freight cars as they are sorted into trains. Each retarder consists of a series of stationary brakes surrounding a short section of each rail on the track that grip and slow the cars' wheels through friction as they roll through them. Modern retarders are computer controlled to apply a precise amount of pressure on the wheels so that cars rolling down a yard's hump are slowed to a safe speed for coupling with cars already standing on the yard's tracks.
