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Ceramics

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Foodware, sculpture, decorative tiles, dolls and other ceramic or clay items are made in both large and small professional studios and shops, classrooms in public schools, universities and trade schools, and in homes as a hobby or cottage industry. The methods can be divided into ceramics and pottery, although terminology can vary in different countries. In ceramics, objects are made by slip casting—pouring a slurry of water, clay and other ingredients into a mould. The clay objects are removed from the mould, trimmed and fired in a kiln. Some ware (bisque ware) is sold after this stage. Other types are decorated with glazes that are mixtures of silica and other substances which form a glass surface. In pottery, objects are formed from plastic clay, usually by hand-forming or wheel-throwing, after which they are dried and fired in a kiln. Objects may then be glazed. Slip cast ceramics usually are glazed with china paints, which are commercially produced in dry or liquid pre-packaged form (figure 1). Potters may glaze their ware with these commercial glazes or with glazes they compound themselves. All types of ware are produced, from terra cotta and earthenware, which are fired at low temperatures, to stoneware and porcelain, which are fired at high temperatures.

Figure 1.  Decorating a pot with China paints.

ENT090F1

Clay and Glaze Materials

All clays and glazes are mixtures of silica, aluminium and metallic minerals. These ingredients usually contain significant amounts of respirable-sized particles such as those in silica flour and ball clays. Clay bodies and glazes are composed of essentially the same types of minerals (see table 1, but glazes are formulated to melt at lower temperatures (have more flux) than the bodies on which they are applied. Lead is a common flux. Raw lead minerals such as galena and lead oxides derived from burning car battery plates and other scrap are used as fluxes, and have poisoned potters and their families in some developing countries. Commercially sold glazes for industrial and hobby use are more likely to contain lead and other chemicals which have been mixed and pre-fired into powdered frits. Glazes are formulated to mature in either oxidation or reduction firing (see below) and may contain metal compounds as colourants. Lead, cadmium, barium and other metals may leach into food when glazed ceramic wares are used.

Table 1. Ingredients of ceramic bodies and glazes.

Basic constituents

 

 

Clays (hydroaluminium silicates)

Alumina

Silica

Kaolins and other white clays

Red iron-rich clays

Fire clays

Ball clays

Bentonite

Aluminium oxide, corundum, usual source in glazes is from clays and feldspars

Quartz from flint, sand, diatomaceous earth; cristobalite from calcined silica or fired silica minerals

Other ingredients and some mineral sources

Fluxes

Opacifiers

Colourants

Sodium, potassium, lead, magnesium, lithium, barium, boron, calcium, strontium, bismuth

Tin, zinc, antimony, zirconium, titanium, fluorine, cerium, arsenic

Cobalt, copper, chrome, iron, manganese, cadmium, vanadium, nickel, uranium

Sources include oxides and carbonates of metals above, feldspars, talc, nepheline syenite, borax, colemanite, whiting, lead frits, lead silicates

Sources include oxides and carbonates of metals above, cryolite fluorspar, rutile, zirconium silicate

Sources include oxides, carbonates and sulphates of metals above, chromates, spinels and other metal complexes

 

Other special surface treatments include metallic lustre glazes containing tack oils and solvents such as chloroform, iridescent effects obtained by fuming metallic salts (usually chlorides of tin, iron, titanium or vanadium) onto surfaces during firing, and new paints containing plastic resins and solvents, which look like fired ceramic glazes when dry. Specially textured clay bodies may include fillers such as vermiculite, perlite and grog (ground fire brick).

Exposure to clay and glaze ingredients occurs during mixing, sanding and spray-applying glazes, and when grinding or chipping fired glaze imperfections from the bottoms of pottery or from kiln shelves (figure 2). Cleaning kiln shelves exposes workers to flint, kaolin and other kiln wash ingredients. Silica dust from fired kiln wash or bisque is more hazardous because it is in the cristobalite form. Hazards include: silicosis and other pneumoconioses from inhalation of minerals such as silica, kaolin, talc and fibrous amphibole asbestos in some talcs; toxicity from exposure to metals such as lead, barium and lithium; dermatitis from sensitizing metals such as chrome, nickel and cobalt; cumulative trauma disorders such as carpal tunnel syndrome (“potter’s thumb”) from wheel throwing; back injuries from digging clay, lifting 100-pound sacks of bulk minerals or from wedging (hand working clay to remove air bubbles); slips and falls on wet floors; shocks from electric pottery wheels and other equipment used in wet areas; allergies to moulds in clay; fungal and bacterial infections of nail beds and skin; and accidents with clay mixers, pug mills, blungers, slab rollers and the like.

Figure 2. Exposure to clay and glaze dusts while hand sanding a pot.

ENT090F3

Henry Dunsmore

Precautions: outlaw open lead burning; use substitutes for raw lead, lead frits, cadmium and asbestos-containing materials; isolate work from family areas and children; practice housekeeping and hygiene; control dust; use local exhaust ventilation for glaze spraying and dusty processes (figure 3); use respiratory protection; work with adequate rest periods; lift safely; guard machines; and use ground fault interrupters on wheels and all other electrical equipment.

Figure 3. Local exhaust ventilation for clay mixing.

ENT090F2

Michael McCann

Kiln Firing

Kilns vary from railroad-car size to a few cubic inches for firing test tiles and miniatures. They are heated with electricity or fuels such as gas, oil or wood. Electric kilns produce ware fired in primarily oxidizing atmospheres. Reduction firing is achieved by adjusting fuel/air ratios in fuel-fired kilns to create chemically reducing atmospheres. Firing methods include salt firing, raku (putting red-hot pots into organic matter such as damp hay to produce a smoky reduced clay body), climbing kilns (many-chambered wood or coal fired kilns built on hillsides), sawdust firing (kilns packed tight with pots and sawdust) and open-pit firing with many fuels including grass, wood and dung.

Primitive fuel-fired kilns are poorly insulated because they are usually made of fired clay, brick or mud. Such kilns can burn large amounts of wood and can contribute to fuel shortages in developing countries. Commercial kilns are insulated with refractory brick, castable refractory or ceramic fibre. Asbestos insulation is still found in older kilns. Refractory ceramic fibre is in very wide use in industry and hobby kilns. There are even small fibre kilns which are heated by putting them in home kitchen microwave ovens.

Kiln emissions include combustion products from fuels and from organic matter that contaminates clay and glaze minerals, sulphur oxides, fluorine and chlorine from minerals such as cryolite and sodalite, and metal fumes. Salt firing emits hydrochloric acid. Emissions are especially hazardous when fuels such as painted or treated wood and waste oils are burned. Hazards include: respiratory irritation or sensitization from aldehydes, sulphur oxides, halogens and other emissions; asphyxiation from carbon monoxide; cancer from inhalation of asbestos or ceramic fibre; eye damage from infrared radiation from glowing hot kilns; and thermal injury and burns.

Precautions: use clean-burning fuels; design fuel-efficient, well-insulated kilns; substitute refractory brick for asbestos or ceramic fibre; encapsulate or remove existing fibre insulation; locally vent indoor kilns; locate kilns in areas free of combustible materials; equip electric kilns with two automatic shut-offs; wear infrared-blocking goggles and gloves when handling hot objects.

 

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Contents

Preface
Part I. The Body
Part II. Health Care
Part III. Management & Policy
Part IV. Tools and Approaches
Part V. Psychosocial and Organizational Factors
Part VI. General Hazards
Part VII. The Environment
Part VIII. Accidents and Safety Management
Part IX. Chemicals
Part X. Industries Based on Biological Resources
Part XI. Industries Based on Natural Resources
Part XII. Chemical Industries
Part XIII. Manufacturing Industries
Part XIV. Textile and Apparel Industries
Part XV. Transport Industries
Part XVI. Construction
Part XVII. Services and Trade
Education and Training Services
Emergency and Security Services
Entertainment and the Arts
Arts and Crafts
Performing and Media Arts
Entertainment
Entertainment and the Arts Resources
Health Care Facilities and Services
Hotels and Restaurants
Office and Retail Trades
Personal and Community Services
Public and Government Services
Transport Industry and Warehousing
Part XVIII. Guides

Entertainment and the Arts Additional Resources

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Entertainment and the Arts References

American Academy of Orthopedic Surgeons. 1991. Protective equipment. In Athletic Training and Sports Medicine. Park Ridge, IL: APOS.

Arheim, DD. 1986. Dance Injuries: Their Prevention and Care. St. Louis, MO: CV Mosby Co.

Armstrong, RA, P Neill, and R Mossop. 1988. Asthma induced by ivory dust: A new occupational cause. Thorax 43(9):737-738.

Axelsson, A and F Lindgren. 1981. Hearing in classical musicians. Acta Oto-Larynogologica 92 Suppl. 377:3-74.

Babin, A 1996. Orchestra pit sound level measurements in Broadway shows. Presented at the 26th Annual Meeting of the American Public Health Association. New York, 20 November.

Baker, EL, WA Peterson, JL Holtz, C Coleman, and PJ Landrigan. 1979. Subacute cadmium intoxication in jewellery workers: an evaluation of diagnostic procedures. Arch Environ Health 34:173-177.

Balafrej, A, J Bellakhdar, M El Haitem, and H Khadri. 1984. Paralysis due to glue in young apprentice shoemakers in the medina of Fez. Rev Pediatrie 20(1):43-47.

Ballesteros, M, CMA Zuniga, and OA Cardenas. 1983. Lead concentrations in the blood of children from pottery-making families exposed to lead salts in a Mexican village. B Pan Am Health Organ 17(1):35-41.

Bastian, RW. 1993. Benign mucosal and saccular disorders; benign laryngeal tumors. In Otolaryngology-Head and Neck Surgery, edited by CW Cumming. St. Louis, MO: CV Mosby Co.

—. 1996. Vocal fold microsurgery in singers. Journal of Voice 10(4):389-404

Bastian, R, A Keidar, and K Verdolini-Marston. 1990. Simple vocal tasks for detecting vocal fold swelling. Journal of Voice 4(2):172-183.

Bowling, A. 1989. Injuries to dancers: Prevalence, treatment and perception of causes. British Medical Journal 6675:731-734.

Bruno, PJ, WN Scott, and G Huie. 1995. Basketball. In The Team Physicians’s Handbook, edited by MB Mellion, WM Walsh and GL Shelton. Philadelphia, PA: Mosby Yearbook.

Burr, GA, TJ Van Gilder, DB Trout, TG Wilcox, and R Friscoll. 1994. Health Hazard Evaluation Report: Actors’ Equity Association/The League of American Theaters and Producers, Inc. Doc. HETA 90-355-2449. Cincinnati, OH: US National Institute for Occupational Safety and Health.

Calabrese, LH, DT Kirkendal, and M Floyd. 1983. Menstrual abnormalities, nutritional patterns and body composition in female classical ballet dancers. Phys Sports Med 11:86-98.

Cardullo, AC, AM Ruszkowski, and VA DeLeo. 1989. Allergic contact dermatitis resulting from sensitivity to citrus peel, geriniol, and citral. J Am Acad Dermatol 21(2):395-397.

Carlson, T. 1989. Lights! Camera! Tragedy. TV Guide (26 August):8-11.

Chasin, M and JP Chong. 1992. A clinically efficient hearing protection program for musicians. Med Prob Perform Artists 7(2):40-43.

—. 1995. Four environmental techniques to reduce the effect of music exposure on hearing. Med Prob Perform Artists 10(2):66-69.

Chaterjee, M. 1990. Ready-made garment workers in Ahmedabad. B Occup Health Safety 19:2-5.

Clare, PR. 1990. Football. In The Team Physicians’s Handbook, edited by MB Mellion, WM Walsh, and GL Shelton. St. Louis, MO: CV Mosby Co.

Cornell, C. 1988. Potters, lead and health—Occupational safety in a Mexican village (meeting abstract). Abstr Pap Am Chem S 196:14.

Council on Scientific Affairs of the American Medical Association. 1983. Brain injury in boxing. JAMA 249:254-257.

Das, PK, KP Shukla, and FG Ory. 1992. An occupational health programme for adults and children in the carpet weaving industry, Mirzapur, India: A case study in the informal sector. Soc Sci Med 35(10):1293-1302.

Delacoste, F and P Alexander. 1987. Sex Work: Writings by Women in the Sex Industry. San Francisco, CA: Cleis Press.

Depue, RH and BT Kagey. 1985. A proportionate mortality study of the acting profession. Am J Ind Med 8:57-66.

Dominguez, R, JR DeJuanes Paardo, M Garcia Padros, and F Rodriguez Artalejo. 1987. Antitetanic vaccination in a high-risk population. Med Segur Trab 34:50-56.

Driscoll, RJ, WJ Mulligan, D Schultz, and A Candelaria. 1988. Malignant mesothelioma: a cluster in a Native American population. New Engl J Med 318:1437-1438.

Estébanez, P, K Fitch, and Nájera 1993. HIV and female sex workers. Bull WHO 71(3/4):397-412.

Evans, RW, RI Evans, S Carjaval, and S Perry. 1996. A survey of injuries among Broadway performers. Am J Public Health 86:77-80.

Feder, RJ. 1984. The professional voice and airline flight. Otolaryngology-Head and Neck Surgery, 92(3):251-254.

Feldman, R and T Sedman. 1975. Hobbyists working with lead. New Engl J Med 292:929.

Fishbein, M. 1988. Medical problems among ICSOM musicians. Med Prob Perform Artists 3:1-14.

Fisher, AA. 1976. “Blackjack disease” and other chromate puzzles. Cutis 18(1):21-22.

Frye, HJH. 1986. Incidence of overuse syndrome in the symphony orchestra. Med Prob Perform Artists 1:51-55.

Garrick, JM. 1977. The frequency of injury, mechanism of injury and epidemiology of ankle sprains. Am J Sports Med 5:241-242.

Griffin, R, KD Peterson, J Halseth, and B Reynolds. 1989. Radiographic study of elbow injuries in professional rodeo cowboys. Phys Sports Med 17:85-96.

Hamilton, LH and WG Hamilton. 1991. Classical ballet: Balancing the costs of artistry and athleticism. Med Prob Perform Artists 6:39-44.

Hamilton, WG. 1988. Foot and ankle injuries in dancers. In Sports Clinics of North America, edited by L Yokum. Philadelphia, PA: Williams and Wilkins.

Hardaker, WTJ. 1987. Medical considerations in dance training for children. Am Fam Phys 35(5):93-99.

Henao, S. 1994. Health Conditions of Latin American Workers. Washington, DC: American Public Health Association.

Huie, G and EB Hershman. 1994. The team clinician’s bag. Am Acad Phys Asst 7:403-405.

Huie, G and WN Scott. 1995. Assessment of ankle sprains in athletes. Phys Assist J 19(10):23-24.

Kipen, HM and Y Lerman. 1986. Respiratory abnormalities among photographic developers: A report of 3 cases. Am J Ind Med 9:341-347.

Knishkowy, B and EL Baker. 1986. Transmission of occupational disease to family contacts. Am J Ind Med 9:543-550.

Koplan, JP, AV Wells, HJP Diggory, EL Baker, and J Liddle. 1977. Lead absorption in a community of potters in Barbados. Int J Epidemiol 6:225-229.

Malhotra, HL. 1984. Fire safety in assembly buildings. Fire Safety J 7(3):285-291.

Maloy, E. 1978. Projection booth safety: New findings and new dangers. Int Assoc Electr Inspect News 50(4):20-21.

McCann, M. 1989. 5 dead in movie heliocopter crash. Art Hazards News 12:1.

—. 1991. Lights! Camera! Safety! A Health and Safety Manual for Motion Picture and Television Production. New York: Center for Safety in the Arts.

—. 1992a. Artist Beware. New York: Lyons and Burford.

—. 1992b. Art Safety Procedures: A Health and Safety Manual for Art Schools and Art Departments. New York: Center for Safety in the Arts.

—. 1996. Hazards in cottage industries in developing countries. Am J Ind Med 30:125-129.

McCann, M, N Hall, R Klarnet, and PA Peltz. 1986. Reproductive hazards in the arts and crafts. Presented at the Annual Conference of the Society for Occupational and Environmental Health Conference on Reproductive Hazards in the Environment and Workplace, Bethesda, MD, 26 April.

Miller, AB, DT Silverman, and A Blair. 1986. Cancer risk among artistic painters. Am J Ind Med 9:281-287.

MMWR. 1982. Chromium sensitization in an artist’s workshop. Morb Mort Weekly Rep 31:111.

—. 1996. Bull riding-related brain and spinal cord injuries—Louisiana, 1994-1995. Morb and Mort Weekly Rep 45:3-5.

Monk, TH. 1994. Circadian rhythms in subjective activation, mood, and performance efficiency. In Principles and Practice of Sleep Medicine, 2nd edition, edited by M. Kryger and WC. Roth. Philadelphia, PA: WB Saunders.

National Institute for Occupational Safety and Health (NIOSH). 1991. Environmental Tobacco Smoke in the Workplace: NIOSH Current Intelligence Bulletin 54. Cincinnati, OH: NIOSH.

Norris, RN. 1990. Physical disorders of visual artists. Art Hazards News 13(2):1.

Nubé, J. 1995. Beta Blockers and Performing Musicians. Doctoral thesis. Amsterdam: University of Amsterdam.

O’Donoghue, DH. 1950. Surgical treatment of fresh injuries to major ligaments of the knee. J Bone Joint Surg 32:721-738.

Olkinuora, M. 1984. Alcoholism and occupation. Scand J Work Environ Health 10(6):511-515.

—. 1976. Injuries to the knee. In Treatment of Injuries to Athletes, edited by DH O’Donoghue. Philadelphia, PA: WB Saunders.

Pan American Health Organization, (PAHO). 1994. Health Conditions in the Americas. Vol. 1. Washington, DC: PAHO.

Pheterson, G. 1989. The Vindication of the Rights of Whores. Seattle, WA: Seal Press.

Prockup, L. 1978. Neuropathy in an artist. Hosp Pract (November):89.

Qualley, CA. 1986. Safety in the Artroom. Worcester, MA: Davis Publications.

Ramakrishna, RS, P Muthuthamby, RR Brooks, and DE Ryan. 1982. Blood lead levels in Sri Lankan families recovering gold and silver from jewellers’ waste. Arch Environ Health 37(2):118-120.

Ramazzini, B. 1713. De morbis artificum (Diseases of Workers). Chicago, IL: University of Chicago Press.

Rastogi, SK, BN Gupta, H Chandra, N Mathur, PN Mahendra, and T Husain. 1991. A study of the prevalence of respiratory morbidity among agate workers. Int Arch Occup Environ Health 63(1):21-26.

Rossol, M. 1994. The Artist’s Complete Health and Safety Guide. New York: Allworth Press.

Sachare, A.(ed.). 1994a. Rule #2. Section IIC. In The Official NBA Basketball Encyclopedia. New York: Villard Books.

—. 1994b. Basic Principle P: Guidelines for infection control. In The Official NBA Basketball Encyclopedia. New York: Villard Books.

Sammarco, GJ. 1982. The foot and ankle in classical ballet and modern dance. In Disorders of the Foot, edited by MH Jahss. Philadelphia, PA: WB Saunders.

Sataloff, RT. 1991. Professional Voice: The Science and Art of Clinical Care. New York: Raven Press.

—. 1995. Medications and their effect on the voice. Journal of Singing 52(1):47-52.

—. 1996. Pollution: Consequences for singers. Journal of Singing 52(3):59-64.

Schall, EL, CH Powell, GA Gellin, and MM Key. 1969. Hazards to go-go dancers to exposures to “black” light from fluorescent bulbs. Am Ind Hyg Assoc J 30:413-416.

Schnitt, JM and D Schnitt. 1987. Psychological aspects of dance. In The Science of Dance Training, edited by P Clarkson and M Skrinar. Champaign, IL: Human Kinetics Press.

Seals, J. 1987. Dance surfaces. In Dance Medicine: A Comprehensive Guide, edited by A Ryan and RE Stephens. Chicago, IL: Pluribus Press.

Sofue, I, Y Yamamura, K Ando, M Iida, and T Takayanagi. 1968. N-hexane polyneuropathy. Clin Neurol 8:393-403.

Stewart, R and C Hake. 1976. Paint remover hazard. JAMA 235:398.

Tan, TC, HC Tsang, and LL Wong. 1990. Noise surveys in discotheques in Hong Kong. Ind Health 28(1):37-40.

Teitz, C, RM Harrington, and H Wiley. 1985. Pressure on the foot in point shoes. Foot Ankle 5:216-221.

VanderGriend, RA, FH Savoie, and JL Hughes. 1991. Fracture of the ankle. In Rockwood and Green’s Fractures in Adults, edited by CA Rockwood, DP Green, and RW Bucholz. Philadelphia, PA: JB Lippincott Co.

Warren, M, J Brooks-Gunn, and L Hamilton. 1986. Scoliosis and fracture in young ballet dancers: Relationship to delayed menarcheal age and amenorrhea. New Engl J Med 314:1338-1353.

World Health Organization (WHO). 1976. Meeting on Organization of Health Care in Small Industries. Geneva: WHO.

Zeitels, S. 1995. Premalignant epithelium and microinvasive cancer of the vocal fold: the evolution of phonomicrosurgical management. Laryngoscope 105(3):1-51.