Fluorocarbon coatings

[COMPOSITES news] Mechanical properties of asbestos-reinforced 2045 and 2025

Property

APPN 2045 (45 wt% fibre)

Tensile strength (MN/m") 50.0 Tensile modulus ( G N / m =) 5.6 Flexural strength (kN/m ~) 75.0 Flexural modulus ( G N / m =) 5.8 Impact strength (J/m) 71.0 (notched)

TBA's Arpylene range of reinforced thermoplastics. T u r n e r Brothers Asbestos Co Ltd, Reinforced Plastics Division, PO Box 40, Rochdale, UK

Polyester laminate for electric insulation A new polyester-film/polyester-fibre'tleece' laminate for electrical insulation applications is amongst the range of Pucaro insulation products for the electrical industry, now available from Presspanfabrik Chr Authenrieth. T h e polyester fibres are impregnated with a special heat-resistant resin enabling the laminate to be used for electrical insulation applications at temperatures over 130°C. T h e laminate is available in a range of thicknesses from 0.15 to 0"4 mm and can be supplied with either a rongh or smooth finish according to the end-use requirements. Another Authenrieth insulation material is a combination of Nomex nylon paper (a material with high

polypropylene,

Arpylene APPN

APPN 2025 (25 wt% fibre)

Test method

46'0 4"0 75"0 4"0 58'0

BS2782:301J BS2782:302A BS2782:304C BS2782:302D BS2782:306A

temperature stability) and polyester film, intended for slot insulation in electric motors. In addition, for layer, phase and separator instdation the company otfers a laminate of Nomex Type 411 and Mylar polyester film, as a particuhlrly ahsorbent, non-slip and flexible material. Both combinations are intended for use in insulation class F (155°C). A third is a laminate of Nomex and Kapton polyimide film for similar insulation applications in class H (180°C). Kapton is a material which maintains its good electrical and mechanical properties also under extreme temperature conditions. It has been used in applications atla temperature of 400°C. Among other products for the electrical industry made by Authenrieth and exhibited at Hanover was PucaroKreppisol, a laminate of polyester film and cr6pe paper. It is widely used for class B phase insulation. Three different types are made of this material, offering a number of advantages, such as excellent absorption of insulation varnish, low weight per unit area, non-slip properties and good

handling characterislics for insertion and placement. Presspanfahrik Chr Authenrieth P ucaro-Werk. Post fach 1 D-7109 Roigheini :Wiirtt, German Federal Repul)lic

Composite furniture with microballoons (;oniposites of polyester resins and glass microlialloons, which resenll)le wood. h,lve been used in furniture l n a l n l f { i ( ture (see ilhistration). Microlialhlons can also lie used in other resins (eo epoxides, xinyls) and hiorgani( niatrices such as concrf'te and plaslci of Paris. Other uses inchide the nlo(tification of mining explosives and :is a

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h..__il F m n i t u r e made with a composite of polyester resin and glass microlmlloo.s. Insets show pouring the microtmlloo.,~ [rom a beaker amt a microphotograph o[ the eomposite

thermal insulator in the form of :l dry powder. Emerson & Cuming Inc have nmv produced Eccospheres IG2S (bulk density 0-145g/cm:') a low density. high quality version of Eccospheres I(;101 (hulk density 0.194g/cm"). Emerson & Cuming Inc. (]:llllOll, Massachusetts 02021, USA

Fluorocarbon coatings

Electric motor with slot-liner insulation made polyester lilm

from

polyester-fibre

'fleece'/

An eight-paoe Inochme from Fother gill & Harvey l,td describes industrial applications of Tygadure tltu)rocarl>on coatings based on i'Tl,'l,~, both unreinforced and reinforced wilh siainless steel. Steel-reinforced p'l l, I, (:• l'InOll l ( ( ) l c ) or lnolybdenunl-icinforced PTI:i.: (Arnlournla'x) coatings :ire :lpplied ll~

COMPOSITES September 1972 ] 9 5

[COMPOSITESnews] firstly flame-spraying stainless steel or molybdenum on to the gr!t-blasted surface of the substrate. This produces a surface with an irregular crosssection, r'Tvr is impregnated into this matrix and sintered. This reinforced coating has the non-stick, low friction characteristics of PTVE while the metal reinforcement takes the load and reduces the rate of wear. T h e molybdenum reinforcement is intended for conditions requiring very high bonding strength and wear resistance. Typical applications include coatings for valves, mixing vessels, oven liners, cutting edges, textile drying cylinders and cream dispensing pumps. Armourcote and mrmourmax are the registered trade marks of K. g: F. Treatments Ltd. Fothergill & Harvey Ltd, Tygadure Division, Littleborough, Lancashire, UK

tensile and modulus ( H T / H T - S ) $120. high tensile (A/A-S)$1f)0. Hercules lnc, Wilmington, Delaware 19899, USA

Plastics pipe performance Fulmer Research Institute l,td is studying for the Ministry of Defencc (Navy Department) the dimensional changes in plastics pipes carrying liquids at various pressures and temperature. A special rig has been buih consisting of a number of pipe loops through which various liquids are circulated. T h e rig is designed so that pipes of different materials, including reinforced samples, and joints of ~arions patterns may be tested simultaneously. Fulmer Research Institute Ltd, Stoke Poges, Slough, Bucks, SL2 4QD, UK

SMC for chair manufacture

European plastics association

Permali Ltd of Gloucester, UK, have moved further into the consumer market with a recent contract to mould chairs for Artemide (UK) Ltd. T h e chairs are hot press moulded from polyester sheet moulding compound developed by Artemide and Permali claim an exceptionally high standard of gloss finish and colour density. The chairs (called Selene) are stackat.ile and are intended for use in the home and in commercial establishments. They can be used out of doors. Permali Ltd, Bristol Road, Gloucester, UK

Research directors of plastics organizations of six countries met recently at the invitation of Professor M. Chatain, Directeur du Centre d'Etude des Matibres Plastiques in Paris. The 'Association de Directeurs de Centres Europeens de Plastiques' (ADICEP) which was formed is intended as a forum where members can put forward their points of view on matters of professional interest, exchange ideas and coordinate their future actions. T h e two-day meeting in Paris reviewed current programmes and major areas of study - - topics included process and design engineering, quality testing of materials and products, combustibility and disposal of plastics materials. It is proposed that the Association should meet once per year and the next meeting is scheduled to be held in the Spring of 1973--meanwhile further

Service testing of carbon fibre T h e first carbon-fibre composite components to be used in military service in the UK were the trim tabs fitted to the Royal Air Force Central Flying School Jet Provosts a year ago. They have now completed almost 1500 hours flying and have shown no adverse damage apart from some incurred during handling. A variety of repair techniques are being tested and research is being carried out on protective coatings for carbon-fibre-plastics composites. T h e six carhon fibre composites trim ~abs in service were manufactured by British Aircraft Corporation's Military Aircraft Division. All three divisions of BAC are currently working on a range of carbon fibre research.contracts. British Aircraft Corporation Ltd. Brooklands Road, Weybridge, Surrey. UK

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COMPOSITES September 1972

Those present at the meeting in Paris were: Pr M. Chatain, Director

o[ the Centre d'Etude des Matig'res Plastiques (CEMP), France; Dr Ing. P. J. Bakker, Director of the Knnststoflen en Rubber lntitu~tt TNO (KRITNO), Netherlands; Dr J. Fontan, Director o[ the lns'tituto de Plasticos y Caucho (1PC), Spain; Pr G. Menges, Director o[ the Institut [iir KunststoOverarbeitung ,(IKV), W Germany; Pr Hubeny, Director o[ the Laboratorium [iir Kunststol]technih (LKT-TGM), Austria; Dr H. Tschamler, Director o[ the Osterreichisches Kunststo[finstitut (OKI), Austria; Dr Vincente, Head o[ Technology Department o[ the lnstituto de Plasticos y Caucho (IPC), Spain; Dr W. F. Watson. Director o[ the Rubber and Plastics Research Association (RAPRA), UK.

Platable Noryl resin A new platable Noryl resin (PN-235) is now being marketed in Europe by General Electric Plastics. T h e snccess of Noryl PN-235 as a plating substrate is attributed to a combination of properties - - good dimensional stability, a heat deflection temperature of 112.7°C (135°C when plated) and a coefficient of thermal expansion of 63X10-". Moulding conditions for this new grade are similar to those for other Noryl resins. Also the plating process is virtually identical to that used for ABS.

T h e main market is certain to be in the automotive industry for grilles. bezels and other exterior parts. Other applications could include appliance consoles, console trim on kitchen ranges, clothes dryers and dishwashers,

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Carbon fibre price reduction Flom 1 Jtme 1972 Hercules Inc are selling carbon ill)re at the following prices per pound weight: high modulus (HM/HM-S) $150, intermediale

members will be sought for the Association.

Metal-plated headlamp bezel In Noryl