Job Duties Custom List 47-2121.00 — Glaziers
- Pack spaces between moldings and glass with glazing compounds and trim excess material with glazing knives.
Occupations with related tasks Save Table: XLSX CSV
| Closely Related Tasks | All Related Tasks | Job Zone | Code | Occupation |
| 3 | 5 | 2 | 47-2042.00 | Floor Layers, Except Carpet, Wood, and Hard Tiles 
|
| 3 | 4 | 2 | 47-2142.00 | Paperhangers |
| 3 | 3 | 2 | 47-4099.03 | Weatherization Installers and Technicians |
| 2 | 8 | 2 | 47-2081.00 | Drywall and Ceiling Tile Installers |
| 2 | 3 | 2 | 47-3011.00 | Helpers--Brickmasons, Blockmasons, Stonemasons, and Tile and Marble Setters |
| 2 | 3 | 2 | 47-2053.00 | Terrazzo Workers and Finishers |
| 2 | 2 | 2 | 47-2082.00 | Tapers |
| 1 | 2 | 2 | 47-2141.00 | Painters, Construction and Maintenance |
| 1 | 2 | 2 | 47-2071.00 | Paving, Surfacing, and Tamping Equipment Operators |
| 1 | 2 | 1 | 47-2051.00 | Cement Masons and Concrete Finishers |
| 1 | 2 | 2 | 47-2031.00 | Carpenters |
| 1 | 1 | 1 | 47-3014.00 | Helpers--Painters, Paperhangers, Plasterers, and Stucco Masons |
- Trim excess covering materials, tack edges, and join sections of covering material to form tight joint.
- Form a smooth foundation by stapling plywood or Masonite over the floor or by brushing waterproof compound onto surface and filling cracks with plaster, putty, or grout to seal pores.
- Heat and soften floor covering materials to patch cracks or fit floor coverings around irregular surfaces, using blowtorch.
- Cut flooring material to fit around obstructions.
- Cut covering and foundation materials, according to blueprints and sketches.
- Sweep, scrape, sand, or chip dirt and irregularities to clean base surfaces, correcting imperfections that may show through the covering.
- Inspect surface to be covered to ensure that it is firm and dry.
- Measure and mark guidelines on surfaces or foundations, using chalk lines and dividers.
- Roll and press sheet wall and floor covering into cement base to smooth and finish surface, using hand roller.
- Apply adhesive cement to floor or wall material to join and adhere foundation material.
- Determine traffic areas and decide location of seams.
- Lay out, position, and apply shock-absorbing, sound-deadening, or decorative coverings to floors, walls, and cabinets, following guidelines to keep courses straight and create designs.
- Remove excess cement to clean finished surface.
- Disconnect and remove appliances, light fixtures, and worn floor and wall covering from floors, walls, and cabinets.
- Trim excess covering materials, tack edges, and join sections of covering material to form tight joint.
- Form a smooth foundation by stapling plywood or Masonite over the floor or by brushing waterproof compound onto surface and filling cracks with plaster, putty, or grout to seal pores.
- Heat and soften floor covering materials to patch cracks or fit floor coverings around irregular surfaces, using blowtorch.
- Cut flooring material to fit around obstructions.
- Cut covering and foundation materials, according to blueprints and sketches.
- Trim rough edges from strips, using straightedges and trimming knives.
- Trim excess material at ceilings or baseboards, using knives.
- Fill holes, cracks, and other surface imperfections preparatory to covering surfaces.
- Measure and cut strips from rolls of wallpaper or fabric, using shears or razors.
- Smooth strips or sections of paper with brushes or rollers to remove wrinkles and bubbles and to smooth joints.
- Check finished wallcoverings for proper alignment, pattern matching, and neatness of seams.
- Mark vertical guidelines on walls to align strips, using plumb bobs and chalk lines.
- Cover interior walls and ceilings of rooms with decorative wallpaper or fabric, using hand tools.
- Apply adhesives to the backs of paper strips, using brushes, or dunk strips of prepasted wallcovering in water, wiping off any excess adhesive.
- Place strips or sections of paper on surfaces, aligning section edges and patterns.
- Measure surfaces or review work orders to estimate the quantities of materials needed.
- Apply sizing to seal surfaces and maximize adhesion of coverings to surfaces.
- Smooth rough spots on walls and ceilings, using sandpaper.
- Set up equipment, such as pasteboards and scaffolds.
- Remove old paper, using water, steam machines, or solvents and scrapers.
- Apply thinned glue to waterproof porous surfaces, using brushes, rollers, or pasting machines.
- Mix paste, using paste powder and water, and brush paste onto surfaces.
- Staple or tack advertising posters onto fences, walls, billboards, or poles.
- Remove paint, varnish, dirt, and grease from surfaces, using paint remover and water soda solutions.
- Apply acetic acid to damp plaster to prevent lime from bleeding through paper.
- Trim rough edges from strips, using straightedges and trimming knives.
- Trim excess material at ceilings or baseboards, using knives.
- Fill holes, cracks, and other surface imperfections preparatory to covering surfaces.
- Measure and cut strips from rolls of wallpaper or fabric, using shears or razors.
- Install and seal air ducts, combustion air openings, or ventilation openings to improve heating and cooling efficiency.
- Prepare and apply weather-stripping, glazing, caulking, or door sweeps to reduce energy losses.
- Apply spackling, compounding, or other materials to repair holes in walls.
- Test combustible appliances, such as gas appliances.
- Determine amount of air leakage in buildings, using a blower door machine.
- Test and diagnose air flow systems, using furnace efficiency analysis equipment.
- Inspect buildings to identify required weatherization measures, including repair work, modification, or replacement.
- Recommend weatherization techniques to clients in accordance with needs and applicable energy regulations, codes, policies, or statutes.
- Apply insulation materials, such as loose, blanket, board, and foam insulation to attics, crawl spaces, basements, or walls.
- Make minor repairs using basic hand or power tools and materials, such as glass, lumber, and drywall.
- Prepare cost estimates or specifications for rehabilitation or weatherization services.
- Contact residents or building owners to schedule appointments.
- Wrap air ducts and water lines with insulating materials, such as duct wrap and pipe insulation.
- Clean and maintain tools and equipment.
- Explain recommendations, policies, procedures, requirements, or other related information to residents or building owners.
- Maintain activity logs, financial transaction logs, or other records of weatherization work performed.
- Explain energy conservation measures, such as the use of low flow showerheads and energy-efficient lighting.
- Prepare or assist in the preparation of bids, contracts, or written reports related to weatherization work.
- Install storm windows or storm doors and verify proper fit.
- Wrap water heaters with water heater blankets.
- Install and seal air ducts, combustion air openings, or ventilation openings to improve heating and cooling efficiency.
- Prepare and apply weather-stripping, glazing, caulking, or door sweeps to reduce energy losses.
- Apply spackling, compounding, or other materials to repair holes in walls.
- Trim rough edges from wallboard to maintain even joints, using knives.
- Seal joints between ceiling tiles and walls.
- Measure and cut openings in panels or tiles for electrical outlets, windows, vents, plumbing, or other fixtures, using keyhole saws or other cutting tools.
- Cut metal or wood framing and trim to size, using cutting tools.
- Cut fixture or border tiles to size, using keyhole saws, and insert them into surrounding frameworks.
- Cut and screw together metal channels to make floor or ceiling frames, according to plans for the location of rooms or hallways.
- Scribe and cut edges of tile to fit walls where wall molding is not specified.
- Apply cement to backs of tiles and press tiles into place, aligning them with layout marks or joints of previously laid tile.
- Read blueprints or other specifications to determine methods of installation, work procedures, or material or tool requirements.
- Measure and mark surfaces to lay out work, according to blueprints or drawings, using tape measures, straightedges or squares, and marking devices.
- Fit and fasten wallboard or drywall into position on wood or metal frameworks, using glue, nails, or screws.
- Assemble or install metal framing or decorative trim for windows, doorways, or vents.
- Inspect furrings, mechanical mountings, or masonry surfaces for plumbness and level, using spirit or water levels.
- Hang drywall panels on metal frameworks of walls and ceilings in offices, schools, or other large buildings, using lifts or hoists to adjust panel heights, when necessary.
- Suspend angle iron grids or channel irons from ceilings, using wire.
- Coordinate work with drywall finishers who cover the seams between drywall panels.
- Install horizontal and vertical metal or wooden studs to frames so that wallboard can be attached to interior walls.
- Hang dry lines to wall moldings to guide positioning of main runners.
- Fasten metal or rockboard lath to the structural framework of walls, ceilings, or partitions of buildings, using nails, screws, staples, or wire-ties.
- Install blanket insulation between studs and tack plastic moisture barriers over insulation.
- Remove existing plaster, drywall, or paneling, using crowbars and hammers.
- Apply or mount acoustical tile or blocks, strips, or sheets of shock-absorbing materials to ceilings or walls of buildings to reduce reflection of sound or to decorate rooms.
- Mount tile, using adhesives, or by nailing, screwing, stapling, or wire-tying lath directly to structural frameworks.
- Nail channels or wood furring strips to surfaces to provide mounting for tile.
- Install metal lath where plaster applications will be exposed to weather or water, or for curved or irregular surfaces.
- Wash concrete surfaces before mounting tile to increase adhesive qualities of surfaces, using washing soda and zinc sulfate solution.
- Trim rough edges from wallboard to maintain even joints, using knives.
- Seal joints between ceiling tiles and walls.
- Measure and cut openings in panels or tiles for electrical outlets, windows, vents, plumbing, or other fixtures, using keyhole saws or other cutting tools.
- Cut metal or wood framing and trim to size, using cutting tools.
- Cut fixture or border tiles to size, using keyhole saws, and insert them into surrounding frameworks.
- Cut and screw together metal channels to make floor or ceiling frames, according to plans for the location of rooms or hallways.
- Scribe and cut edges of tile to fit walls where wall molding is not specified.
- Apply cement to backs of tiles and press tiles into place, aligning them with layout marks or joints of previously laid tile.
- Apply grout between joints of bricks or tiles, using grouting trowels.
- Correct surface imperfections or fill chipped, cracked, or broken bricks or tiles, using fillers, adhesives, or grouting materials.
- Cut materials to specified sizes for installation, using power saws or tile cutters.
- Mix mortar, plaster, and grout, manually or using machines, according to standard formulas.
- Erect scaffolding or other installation structures.
- Modify material moving, mixing, grouting, grinding, polishing, or cleaning procedures, according to installation or material requirements.
- Transport materials, tools, or machines to installation sites, manually or using conveyance equipment.
- Provide assistance in the preparation, installation, repair, or rebuilding of tile, brick, or stone surfaces.
- Locate and supply materials to masons for installation, following drawings or numbered sequences.
- Arrange or store materials, machines, tools, or equipment.
- Clean installation surfaces, equipment, tools, work sites, or storage areas, using water, chemical solutions, oxygen lances, or polishing machines.
- Move or position materials such as marble slabs, using cranes, hoists, or dollies.
- Remove excess grout or residue from tile or brick joints, using sponges or trowels.
- Apply caulk, sealants, or other agents to installed surfaces.
- Remove damaged tile, brick, or mortar, and clean or prepare surfaces, using pliers, hammers, chisels, drills, wire brushes, or metal wire anchors.
- Apply grout between joints of bricks or tiles, using grouting trowels.
- Correct surface imperfections or fill chipped, cracked, or broken bricks or tiles, using fillers, adhesives, or grouting materials.
- Cut materials to specified sizes for installation, using power saws or tile cutters.
- Fill slight grinding depressions with matching grout material and hand-trowel for a smooth, uniform surface.
- Wet surface to prepare for bonding, fill holes and cracks with grout or slurry, and smooth with a trowel.
- Cut metal division strips and press them into the terrazzo base for joints or changes of color to form designs or patterns or to help prevent cracks.
- Measure designated amounts of ingredients for terrazzo or grout, according to standard formulas and specifications, using graduated containers and scales, and load ingredients into portable mixer.
- Grind surfaces with a power grinder, or polish surfaces with polishing or surfacing machines.
- Blend marble chip mixtures, place into panels, and push a roller over the surface to embed the chips.
- Modify mixing, grouting, grinding, or cleaning procedures, according to type of installation or material used.
- Spread, level, or smooth concrete or terrazzo mixtures to form bases or finished surfaces, using rakes, shovels, hand or power trowels, hand or power screeds, or floats.
- Grind curved surfaces or areas inaccessible to surfacing machine, such as stairways or cabinet tops, with portable hand grinder.
- Wash polished terrazzo surface, using cleaner and water, and apply sealer and curing agent according to manufacturer's specifications, using brush or sprayer.
- Position and secure moisture membrane and wire mesh in preparation for pouring base materials for terrazzo installation.
- Clean installation site, mixing and storage areas, tools, machines, and equipment, and store materials and equipment.
- Sprinkle colored marble or stone chips, powdered steel, or coloring powder over surface to produce prescribed finish.
- Mix cement, sand, and water to produce concrete, grout, or slurry, using hoe, trowel, tamper, scraper, or concrete-mixing machine.
- Chip, scrape, or grind high spots, ridges, or rough projections to finish concrete, using pneumatic chisel, hand chisel, or other hand tools.
- Mold expansion joints and edges, using edging tools, jointers, or straightedges.
- Move terrazzo installation materials, tools, machines, or work devices to work areas, manually or using wheelbarrow.
- Clean chipped area, using wire brush, and feel and observe surface to determine if it is rough or uneven.
- Repair concrete by cutting out damaged areas, drilling holes for reinforcing rods, and positioning reinforcing rods, using power saw and drill.
- Precast terrazzo blocks in wooden forms.
- Wet concrete surface and rub with stone to smooth surface and obtain specified finish.
- Build wooden molds, clamping molds around areas to be repaired, or setting up frames to the proper depth and alignment.
- Spread roofing paper on surface of foundation and spread concrete onto roofing paper with trowel to form terrazzo base.
- Produce rough concrete surface, using broom.
- Remove frames when the foundation is dry.
- Signal truck driver to position truck to facilitate pouring concrete and move chute to direct concrete on forms.
- Fill slight grinding depressions with matching grout material and hand-trowel for a smooth, uniform surface.
- Wet surface to prepare for bonding, fill holes and cracks with grout or slurry, and smooth with a trowel.
- Cut metal division strips and press them into the terrazzo base for joints or changes of color to form designs or patterns or to help prevent cracks.
- Apply additional coats to fill in holes and make surfaces smooth.
- Seal joints between plasterboard or other wallboard to prepare wall surfaces for painting or papering.
- Spread sealing compound between boards or panels or over cracks, holes, nail heads, or screw heads, using trowels, broadknives, or spatulas.
- Press paper tape over joints to embed tape into sealing compound and to seal joints.
- Spread and smooth cementing material over tape, using trowels or floating machines to blend joints with wall surfaces.
- Sand or patch nicks or cracks in plasterboard or wallboard.
- Mix sealing compounds by hand or with portable electric mixers.
- Work on high ceilings, using scaffolding or other tools, such as stilts.
- Select the correct sealing compound or tape.
- Countersink nails or screws below surfaces of walls before applying sealing compounds, using hammers or screwdrivers.
- Remove extra compound after surfaces have been covered sufficiently.
- Install metal molding at wall corners to secure wallboard.
- Apply texturizing compounds or primers to walls or ceilings before final finishing, using trowels, brushes, rollers, or spray guns.
- Check adhesives to ensure that they will work and will remain durable.
- Sand rough spots of dried cement between applications of compounds.
- Use mechanical applicators that spread compounds and embed tape in one operation.
- Apply additional coats to fill in holes and make surfaces smooth.
- Seal joints between plasterboard or other wallboard to prepare wall surfaces for painting or papering.
- Fill cracks, holes, or joints with caulk, putty, plaster, or other fillers, using caulking guns or putty knives.
- Cut stencils and brush or spray lettering or decorations on surfaces.
- Cover surfaces with dropcloths or masking tape and paper to protect surfaces during painting.
- Smooth surfaces, using sandpaper, scrapers, brushes, steel wool, or sanding machines.
- Read work orders or receive instructions from supervisors or homeowners to determine work requirements.
- Apply primers or sealers to prepare new surfaces, such as bare wood or metal, for finish coats.
- Apply paint, stain, varnish, enamel, or other finishes to equipment, buildings, bridges, or other structures, using brushes, spray guns, or rollers.
- Erect scaffolding or swing gates, or set up ladders, to work above ground level.
- Mix and match colors of paint, stain, or varnish with oil or thinning and drying additives to obtain desired colors and consistencies.
- Calculate amounts of required materials and estimate costs, based on surface measurements or work orders.
- Polish final coats to specified finishes.
- Wash and treat surfaces with oil, turpentine, mildew remover, or other preparations, and sand rough spots to ensure that finishes will adhere properly.
- Select and purchase tools or finishes for surfaces to be covered, considering durability, ease of handling, methods of application, and customers' wishes.
- Remove old finishes by stripping, sanding, wire brushing, burning, or using water or abrasive blasting.
- Remove fixtures such as pictures, door knobs, lamps, or electric switch covers prior to painting.
- Use special finishing techniques such as sponging, ragging, layering, or faux finishing.
- Waterproof buildings, using waterproofers or caulking.
- Spray or brush hot plastics or pitch onto surfaces.
- Bake finishes on painted or enameled articles, using baking ovens.
- Fill cracks, holes, or joints with caulk, putty, plaster, or other fillers, using caulking guns or putty knives.
- Cut stencils and brush or spray lettering or decorations on surfaces.
- Place strips of material, such as cork, asphalt, or steel into joints, or place rolls of expansion-joint material on machines that automatically insert material.
- Operate machines that clean or cut expansion joints in concrete or asphalt and that rout out cracks in pavement.
- Start machine, engage clutch, and push and move levers to guide machine along forms or guidelines and to control the operation of machine attachments.
- Fill tanks, hoppers, or machines with paving materials.
- Control paving machines to push dump trucks and to maintain a constant flow of asphalt or other material into hoppers or screeds.
- Observe distribution of paving material to adjust machine settings or material flow, and indicate low spots for workers to add material.
- Coordinate truck dumping.
- Drive machines onto truck trailers, and drive trucks to transport machines and material to and from job sites.
- Inspect, clean, maintain, and repair equipment, using mechanics' hand tools, or report malfunctions to supervisors.
- Set up and tear down equipment.
- Operate machines to spread, smooth, level, or steel-reinforce stone, concrete, or asphalt on road beds.
- Light burners or start heating units of machines, and regulate screed temperatures and asphalt flow rates.
- Control traffic.
- Shovel blacktop.
- Operate tamping machines or manually roll surfaces to compact earth fills, foundation forms, and finished road materials, according to grade specifications.
- Operate oil distributors, loaders, chip spreaders, dump trucks, and snow plows.
- Drive and operate curbing machines to extrude concrete or asphalt curbing.
- Cut or break up pavement and drive guardrail posts, using machines equipped with interchangeable hammers.
- Install dies, cutters, and extensions to screeds onto machines, using hand tools.
- Set up forms and lay out guidelines for curbs, according to written specifications, using string, spray paint, and concrete or water mixes.
- Place strips of material, such as cork, asphalt, or steel into joints, or place rolls of expansion-joint material on machines that automatically insert material.
- Operate machines that clean or cut expansion joints in concrete or asphalt and that rout out cracks in pavement.
- Wet surface to prepare for bonding, fill holes and cracks with grout or slurry, and smooth, using trowel.
- Cut metal division strips, and press them into terrazzo base so that top edges form desired design or pattern.
- Check the forms that hold the concrete to see that they are properly constructed.
- Set the forms that hold concrete to the desired pitch and depth, and align them.
- Spread, level, and smooth concrete, using rake, shovel, hand or power trowel, hand or power screed, and float.
- Monitor how the wind, heat, or cold affect the curing of the concrete throughout the entire process.
- Mold expansion joints and edges, using edging tools, jointers, and straightedge.
- Signal truck driver to position truck to facilitate pouring concrete, and move chute to direct concrete on forms.
- Direct the casting of the concrete and supervise laborers who use shovels or special tools to spread it.
- Produce rough concrete surface, using broom.
- Apply hardening and sealing compounds to cure surface of concrete, and waterproof or restore surface.
- Operate power vibrator to compact concrete.
- Install anchor bolts, steel plates, door sills and other fixtures in freshly poured concrete or pattern or stamp the surface to provide a decorative finish.
- Waterproof or restore concrete surfaces, using appropriate compounds.
- Mix cement, sand, and water to produce concrete, grout, or slurry, using hoe, trowel, tamper, scraper, or concrete-mixing machine.
- Chip, scrape, and grind high spots, ridges, and rough projections to finish concrete, using pneumatic chisels, power grinders, or hand tools.
- Cut out damaged areas, drill holes for reinforcing rods, and position reinforcing rods to repair concrete, using power saw and drill.
- Wet concrete surface, and rub with stone to smooth surface and obtain specified finish.
- Clean chipped area, using wire brush, and feel and observe surface to determine if it is rough or uneven.
- Build wooden molds, and clamp molds around area to be repaired, using hand tools.
- Sprinkle colored marble or stone chips, powdered steel, or coloring powder over surface to produce prescribed finish.
- Fabricate concrete beams, columns, and panels.
- Polish surface, using polishing or surfacing machine.
- Push roller over surface to embed chips in surface.
- Apply muriatic acid to clean surface, and rinse with water.
- Spread roofing paper on surface of foundation, and spread concrete onto roofing paper with trowel to form terrazzo base.
- Wet surface to prepare for bonding, fill holes and cracks with grout or slurry, and smooth, using trowel.
- Cut metal division strips, and press them into terrazzo base so that top edges form desired design or pattern.
- Fill cracks or other defects in plaster or plasterboard and sand patch, using patching plaster, trowel, and sanding tool.
- Shape or cut materials to specified measurements, using hand tools, machines, or power saws.
- Follow established safety rules and regulations and maintain a safe and clean environment.
- Measure and mark cutting lines on materials, using a ruler, pencil, chalk, and marking gauge.
- Assemble and fasten materials to make frameworks or props, using hand tools and wood screws, nails, dowel pins, or glue.
- Study specifications in blueprints, sketches, or building plans to prepare project layout and determine dimensions and materials required.
- Verify trueness of structure, using plumb bob and level.
- Inspect ceiling or floor tile, wall coverings, siding, glass, or woodwork to detect broken or damaged structures.
- Erect scaffolding or ladders for assembling structures above ground level.
- Install structures or fixtures, such as windows, frames, floorings, trim, or hardware, using carpenters' hand or power tools.
- Maintain records, document actions, and present written progress reports.
- Remove damaged or defective parts or sections of structures and repair or replace, using hand tools.
- Maintain job records and schedule work crew.
- Anchor and brace forms and other structures in place, using nails, bolts, anchor rods, steel cables, planks, wedges, and timbers.
- Bore boltholes in timber, masonry or concrete walls, using power drill.
- Install rough door and window frames, subflooring, fixtures, or temporary supports in structures undergoing construction or repair.
- Dig or direct digging of post holes and set poles to support structures.
- Cover subfloors with building paper to keep out moisture and lay hardwood, parquet, or wood-strip-block floors by nailing floors to subfloor or cementing them to mastic or asphalt base.
- Construct forms or chutes for pouring concrete.
- Arrange for subcontractors to deal with special areas, such as heating or electrical wiring work.
- Build or repair cabinets, doors, frameworks, floors, or other wooden fixtures used in buildings, using woodworking machines, carpenter's hand tools, or power tools.
- Finish surfaces of woodwork or wallboard in houses or buildings, using paint, hand tools, or paneling.
- Select and order lumber or other required materials.
- Work with or remove hazardous material.
- Prepare cost estimates for clients or employers.
- Perform minor plumbing, welding, or concrete mixing work.
- Apply shock-absorbing, sound-deadening, or decorative paneling to ceilings or walls.
- Examine structural timbers and supports to detect decay, and replace timbers as required, using hand tools, nuts, and bolts.
- Build sleds from logs and timbers for use in hauling camp buildings and machinery through wooded areas.
- Fill cracks or other defects in plaster or plasterboard and sand patch, using patching plaster, trowel, and sanding tool.
- Shape or cut materials to specified measurements, using hand tools, machines, or power saws.
- Fill cracks or breaks in surfaces of plaster articles or areas with putty or epoxy compounds.
- Clean work areas and equipment.
- Perform support duties to assist painters, paperhangers, plasterers, or masons.
- Apply protective coverings, such as masking tape, to articles or areas that could be damaged or stained by work processes.
- Erect scaffolding.
- Supply or hold tools and materials.
- Smooth surfaces of articles to be painted, using sanding and buffing tools and equipment.
- Mix plaster, and carry plaster to plasterers.
- Place articles to be stripped into stripping tanks.
- Remove articles such as cabinets, metal furniture, and paint containers from stripping tanks after prescribed periods of time.
- Pour specified amounts of chemical solutions into stripping tanks.
- Fill cracks or breaks in surfaces of plaster articles or areas with putty or epoxy compounds.
