Document pmK79Y0e5g3GwB4NmEgbOynok

-*-- .- .----a-S^.^- -..-n- i-^ffci rfKls . s% LEAD INDUSTRIES ASSOCIATION tea ma d is o n a v c n u i NEW YORK 17, N. V. September 13, 19^0 SUBJECT! PROVISO GROUND FOR LEAPED SOUWDPROOFEB3 To Member* o' tha Lead Industrie* Association! We are attaching a copy of a reprint entitled "Proving Ground for Leaded Soundproofer*" from "Chemical Week" of August 27, i960. * Casing free another leading trade publication, ve believe this article la further evidence of the amount of Interest shovn by Industry la soundproofing and the possibilities of lead to solve noise problems. It Is particularly noteworthy that so many concerns are getting Into the act and conducting research and development on their own, at no cost to LIA, largely as a result of publicity and advertising emanating from the Association. i Very truly yours, (^>~r^77b` < Secretary VS i FLZsJRH Att. 9 TT LIA2A332 O Pipeline prtuwr* reduction it noisy, but ImM plastic material may help huth tht din* o Proving Ground for Leaded Soundproofers The auric^H tan of Trento*, NJ,, dtliea* -- luirid by a wofcy pipeline -Buy (d relief la the Best few weeks from kaf-mulal{ pU ricv m oM-dae material that** ow fiodiag aew met la acottstks The Trenton case presents a for midable problem. In reducing the pipeline pressure of natural gas flow ing in from Texas from 600 psi. to 200 pvi., the Public Service Gas & Electric Co. (Newark. NJ ) ruefully finds that io the neighborhood of the Trenton converting station the line gives off a cacophony of whistles, screeches and roan. To solve the problem the Arm is trying to And a method of noise abatement. Inside track h hekl b> Cordo Chem ical Co. (Norwalk, Conn ), whose Coustifah, a bad-loaded vinyl, is top contender for the )cb. The leaded aplastic would be snapped around the pipes, cutting noise and vibration. Coustifah b just one example of the increasing number of lead-con taining plastic and synthetic rubber products being u^ed for damping sound. The Lead Industries Asm. esti mates that 600.000-800.000 lbs./>eaf of lead is currently being con sumed for these materials, expects a 10-fold jump by *65. Newly found applications arc making deeper in roads every day into the acoustical market. And although the number of producers in the field are few so far, several big chemical Arms arc known to be researching similar prod ucts for possible entry into the mar ket. Mapping the Market: Leaded plas tics are not new; they've been finding a market for 20 years as radiation (eg. X-ray) shielding. But within (ha last year and a half, new end-uses have opened up in construction, air craft, submarines and surface ships, machinery mounts, air-conditioning units, transformers, office machines. Reason for success: the high sound absorbtiort powers of lead, plus the flexibility of vinyl, make it much more effective and somewhat differ ent than many conventional acousti cal materials (tiles, felt, glass fiber) now on the market Such materials, acting as a labyrinth, trap much of the sound, but by no means all of it. Leaded plastics, on the other hand, prevent sound from penetrating. Big ta Aconsdcs Cordo's Coustifab b a lead powder dispersed io vinyl, and applied as a coat *o woven glass or cotton duck fabric. It can be produced in a continuous roll or cast in slabs, and may be colored, embossed or printed. Formulation consists of about 20% vinyl, and 6675% lead. It is backed with a special pressure-sensitive adhesive. Cost b 60* to $I-5C/*q.ft., depending on the thicknet*. About e year and a half ago the company began seeking uses for the material other than as X-ray shield ing. One new customer b the Navy, which has found it effective for damp ing hull plates in ships. When applied to the inside of a hull, Coustifah prevents sonar equipment from vi brating. It's also used to soundproof CHEMICAL WEEK August 27. 1960 121 N 2035.01 mxm 'i*11 '"U-Hji wu LIA2A333 r- rooms containing sonar equipment. Another market it in aircraft-- e g-, ceilings arnl rear tide panels of jet*. Sikonky selected (he material last month for its helicopters, after finding it markedly reduces noise in cabins. In the building trade, a possible use is for hotel and motel walls. Most walk are normally 5 to 6 in. thick, including plaster. Coustifab 4 t>uld re duce required wall thickness to 3 in,, saving space. Partitions and folding doors are two more fields in which the material is just beginning to penetrate. Among the companies now mak ing use of the material: Carrier Cnrp., for air conditioners; General Elec tric, for transformers; Du Pont, for noise damping on compressors and motors. Office machines (electric typewrit ers. computers, etc.) are said to be lesa noisy when constructed with Coustifab. Other Entries Bar-Ray Products. Inc. (Brooklyn. N.Y.), is now sup plying a leaded vinyl similar to Couv tifab as radiation shielding, hopes to get into the acoustical field shortly with Lead-X. The firm is currently doing preliminary testing with its sound-deadener in office machines, aircraft and air conditioners. The Devcon Corp. (Danvers. Mass.) is marketing a leaded eposy called Devcon L for sealing and bond ing in the marine and maintenance fields. It's 94** lead powder and eposy resins, and can be cast with out beat or pressure. It is reported to have good adherence to lead, lu* minum, concrete, porcelain and a r.umher of other materials. When it hardens it can he sawed or machined with ordinary tools. The putty is also said to be an effective shield against radioactive materials. One casualty of the business is re ported by Johnson A Johnson's Per* mace! Division (New Brunswick. N.J.). vhich was testing an acoustical material consisting of 70tt fine lead powder with JO** isocyanate applied to a Mylar backing. Disappointing results caused the product to be drop ped about two months ago. Silicones are also now getting the lead treatment Connecticut Hard Rubber Co. (New Haven. Conn.) for the last few months has been selling leaded silicone rubber. Cohrlastic HG, for radiation and acoustical use. It is said to provide uniform shield ing against high<ncrgy radiation, has a high specific gravity, good resiliency qualities, and can be molded or ex truded. or coated on fabrics. The company, looking toward the mili tary, sees a worthy potential market in missiles and outer-space aircraft And a radiation shield of paraffin and lead has been investigated by California Ink Co. (Berkeley, Calif.). Originally developed by the Univer sity of California's radiation labora tory. it's made of granulated lead in a paraffin wax base, is lighter and con siderably cheaper than solid lead (CW Technology S'e*'.lelter, July IS, sn. Neoprene Gets late Act: Within the past year the Navy has also started using lead-containing neoprene as sound-damper on submarines--both nuclear and conventional. Exbrior areas of the nuclear-powered Triton and Skipjack are swathed in a fabri cated neoprene sheathing containing loose lead shot, wh'>ch damps sound, serves as sn antiturbulence and anti fouling coating. Main producer of the material k Irving B. Moore Co. (Bostoo), which also supplies it to commercial ship ping manufacturers. Chemical Coalings A Engineering Co. (Media, Pa.) baa been handling leaded neoprene for acoustic uses about two years. It sells Corrocote neoprene and leaded isocyanate coat ings, putties, and foams. MbsOe-Age Materials Right now the market for leaded materials it uill undeveloped. Because price of the material is relatively high, big gest customer is the military, although manufacturers of appliances ire coosidering the sound-reducing aspects of the material. Washing machine makers, for ex ample, have found that vibration end noise is practically noo-existent when a machine is lined with a leaded plas tic. And even a few cents worth of the material, strategically placed, re duces noticeably noise. But in view of the rapid growth of the business in the past year, and the potential of lead-containing materials in missiles, nuclear vessels, and air craft--as well u a roster of civilian uses--leaded plistic and neoprene are decidedly* a potential market on the move. o o 1-ericas O August 27, I960 JUprtnfod from CHfMICAl WfK Copyright I960 by McG/ow-Wdf Publishing Comport), he. 330 Wed 42nd Street, Now York 3d, Now Tori