ID236 Manufacturing Materials - Week 6 Flashcards

Flashcards of key vocabulary and concepts from the lecture.

Thermosets

Polymer chains have cross-links, resulting in a 'net' structure, restricting chain slip when heated, causing them to burn instead of melting.

Thermosets Properties

Excellent hardness, durability, and electrical insulation but poor impact strength.

Phenol Formaldehyde (PF)

Low cost, hard, rigid, and wear-resistant thermoset, naturally dark brown, with good chemical, fire, and heat resistance, used with fillers.

Typical Uses (Powder) Phenol Formaldehyde (PF)

Toilet seats, handles and knobs for industrial machine parts, saucepans, kettles, knobs for irons

Typical Uses (Liquid Resin) Phenol Formaldehyde (PF)

Boards for electrical parts, for load-bearing applications and for outdoor (weather-resistant) panels.

Urea Formaldehyde (UF)

Specialist thermoset with a naturally white color, very hard and rigid, high tensile strength, and good electrical insulation.

Typical Uses (Powder) Urea Formaldehyde (UF)

White electrical fittings, bathroom fittings, toilet seats, product handles and knobs, bottle screw tops (high temperature resistant).

Typical Uses (Liquid Resin) Urea Formaldehyde (UF)

Adhesives for bonding plywood and chipboard, and rigid expanded foam for flower arranging.

Melamine Formaldehyde (MF)

Thermoset with excellent durability, hardness, temperature service range, water, chemical, and abrasion resistance, brightly colored and transparent.

Typical Uses (Powder) Melamine Formaldehyde (MF)

Compression molded kitchenware, tableware, trays, plates, cups, Melaware®, handles, knobs.

Typical Uses (Liquid Resin) Melamine Formaldehyde (MF)

Production of decorative laminates, such as Formica®.

Epoxy

Good heat, water, abrasive and chemical resistance; resistant to most acids and solvents; used as resin or powder with a hardener for curing.

Ideal Uses Epoxy

Glass fiber reinforced plastic, carbon fiber reinforced plastic, surface coatings, paints, adhesives, ‘potting’ compound for electric components.

Powder use of Epoxy

Encapsulation of electronic components, surface coating of metals resisting corrosion and wear.

Resin use of Epoxy

Adhesives for joining materials, floor coating, surface coating of metal food tins, prototype mold making.

Polyester

Hybrid polymer available as either a thermoplastic or thermosetting material.

Thermosetting polyester

The material is supplied as a two part system (liquid or solid) that cures when subjected to heat and/or pressure

Uses of polyester thermosetting

Clear casting resin or resin for glass fiber reinforced plastic, imitation marble, connectors, protective housings, clothing (textile), encapsulation resin, car body ‘filler’.

Clear Casting Resin Use

Encapsulation of articles (flowers, insects).

Fiber Reinforced Polyester Use

Used for constructional purposes.

Polyester Fibre Use

Used in all types of clothing, either alone or blended with fibers such as cotton.

Polyethylene Terephtalate (PET)

Packaging thermoplastic, especially for high optical quality blow mouldings, with good barrier properties and impact resistance.

Typical Applications of PET

Food and drinks packaging; detergent and cosmetics packaging.

Polyurethane (PU)

Material with grades ranging from soft to hard, flexible to stiff, lightweight to dense, with good resistance to solvents, grease, and acids.

Foam PU Classes

Flexible and Elastic Foam PU, Semi-Rigid Foam PU, Rigid Foam PU

Flexible and Elastic Foam PU Uses

Furniture cushions, carpet underlay, sports mats, sponges, mops, stress balls, sports padding, disposable ear plugs.

Semi-Rigid Foam PU Typical Uses

Buoyancy, car bumpers, headrests, arm rests, steering wheels, furniture.

Rigid (Structural) Foam PU Typical Uses

Low volume product casings, picture frames, knobs and handles.

Imitation Leather PU

A low cost leather replacement, having a softer and more silky finish than PVC imitation leather.

Elastomers

Special class of thermosetting or thermoplastic polymers, noted for their remarkable elasticity.