Surface coatings
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Surface coatings are applied to materials like steel and timber to protect them from corrosion and rotting, to decorate surfaces and add special effects, and to sanitize items by making them easier to clean. Paint consists of a thinner, binder, and pigment and dries through the processes of evaporation, oxidation, and coalescence as the binder particles fuse together into a film. When mixing a two-part coating, it is important to follow the manufacturer's recommendations on ratios and be aware of the mixture's pot life, which refers to the usable life of the mixture before it starts to cure and become unusable.
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A complete denture is a removable dental prosthesis that replaces the entire dentition and associated structures of the maxilla and mandible. It is composed of artificial teeth attached to a denture base resin. Denture base resins can be classified into heat polymerizable polymers, autopolymerizable polymers, thermoplastic blanks, light activated materials, and microwave cured materials. Heat activated denture base resin requires a curing cycle involving processing in a water bath at temperatures ranging from 74°C to 100°C to control polymerization. Chemically activated resins polymerize at room temperature and are used for making temporary crowns/FPDs and denture repairs. Properties of denture base resins include biocompat
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denture base resin presentation
A complete denture replaces the entire dentition and associated structures of the maxilla and mandible. It consists of artificial teeth attached to a denture base, which is composed of denture base resin. There are several types of denture base resins including heat polymerizable, autopolymerizable, thermoplastic blanks, light activated materials, and microwave cured materials. Heat activated denture base resin is commonly used and involves processing the resin in a water bath at temperatures ranging from 74°C to 100°C to induce polymerization. Chemically activated resin polymerizes at room temperature and is often used for temporary or repair work. Processing errors can occur with shrinkage, porosity, crazing or creep depending on the
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This document discusses several important topics in workplace health and safety:
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- The Control of Substances Hazardous to Health Regulations provide guidelines for handling hazardous materials safely.
- Proper safety techniques and personal protective equipment are necessary for tasks like manual handling, working at heights, and using hazardous substances to prevent injuries.
- Other important safety practices covered include first aid, accident reporting, use of safety signs, fire safety, and conducting risk assessments. Following these procedures helps create a safe working environment.
Building loads
There are three main types of structural loading: tension, compression, and shear. Tension pulls or stretches material, compression squeezes material, and shear occurs when one part of a component slides over another. All buildings have a substructure below ground, including foundations, and a superstructure above ground. Primary elements of the superstructure are the main supporting, enclosing, and protecting elements like floors and walls that divide space and provide access between floors. Secondary elements are not essential for strength but provide specific functions like completing openings in walls. Finishing elements are the final surfaces of a building like flooring or wall finishes that can be functional or decorative.
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- 1. © City of Glasgow College Charity Number SC0 36198 Surface Coatings
- 2. To protect – stops steel corroding, timber rotting To decorate – improves appearance, special effects To sanitise – more hygienic, easier to clean To identify – pipework and other items Why apply coatings?
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