Thermosetting
Urea-formaldehyde is a thermoset plastic. Once it is cured, it undergoes a chemical reaction that permanently sets its shape, making it hard and durable. Thermoset plastics cannot be reshaped or melted once they are formed.
A plastic spoon is a thermoplastic. If heated further, it becomes pliant and it can be melted or remolded.
Polythene (regardless of density) is a thermoplastic.
Urea formaldehyde was invented in the early 20th century, around the 1920s. It was first developed in Germany as a resin adhesive for use in wood products and is now commonly used in various industries such as construction and automotive.
An improved method for the preparation of particleboard wherein a cellulose-containing particulate material is provided with a urea formaldehyde resin bonding agent and thereafter shaped and hardened at an elevated temperature and pressure. The bonding agent used is a urea-formaldehyde resin solution additionally containing melamine in an amount of 1.0 and 10 percent by weight, relative to the total amount of resin solids. The molar ratio of formaldehyde to mole equivalents of amino groups in the bonding agent is in the range of between 0.500:1 and 0.575:1.
Urea-formaldehyde is a thermoset plastic. Once it is cured, it undergoes a chemical reaction that permanently sets its shape, making it hard and durable. Thermoset plastics cannot be reshaped or melted once they are formed.
thermoplastic
Thermoset
The answer is thermoset :)
No,carpet urea is urea formaldehyde it is aproduced by treating urea with formaldehyde
A plastic spoon is a thermoplastic. If heated further, it becomes pliant and it can be melted or remolded.
It is a thermoplastic! :)
Thermoplastic and thermoset materials both fall under the broad category of Polymers. The biggest difference between a thermoplastic and thermoset is that a thermoplastic can be recycled. Whereas a thermoset irreversibly cure. Thermoplastic: PE, PP, PVC. Thermoset: Bakelite, Epoxy.
UREA-METHANL
UREA-METHANL
Phenolic resin is made by the reaction between phenol and formaldehyde, whereas urea formaldehyde resin is made by the reaction between urea and formaldehyde. Phenolic resin offers higher heat resistance and better moisture resistance compared to urea formaldehyde resin. Urea formaldehyde resin is typically more cost-effective and has better flexibility than phenolic resin.
i think its a thermoplastic I'm not too shore but when its heated it melts so yeah i guess so :)