Casting plaster supplier in UK.... Casting powder annd dental stone, We are suppliers of casting plaster..
shows you how to cast various shapes in fine casting plaster by making clay moulds. Plaster-of-Paris supplier online... Sculptors Tools, Modelling Materials, Studio Equipment - Prestia Casting Plaster. A fast setting general purpose plaster, used for making moulds or casting of articles where hardness of setting is not important. .Cast yourself body casts Instructions on how to make a plaster cast
... Casting powder supplies.. We supply plaster-of-paris materials, shops and warehouse in Hertfordshire, Bedfordshire, Essex, North London, Buckinghamshire, Berkshire, Suffolk, Lancashire, Cheshire and Yorkshire... Birmingham, Bristol and Manchester, also Kent, Sussex and Surrey
p.o.p. bandage, (also valled ortho-bandage, modroc or mdelling rock for bone-setting, Herculite No.2 casting plaster 10 kg... the proper plaster or gypsum properly mixed. ordinary "Plaster of Paris" is not suitable for ceramic applications; Crystacast and Crystacast R both very dense surface... strength, hardness, and is extremely absorbent. The shelf-life of plasters is usually 6 months. It must be kept dry, preferably in a sealed container off the floor and away from external walls. Objects exposed to water such as pond features and fountains. All are very fine plasters and pick up detail very well. Low reticulation good plaster flow fluidity. Weather resistance and resistance to frost or intense sunlight or heat,...
Crystacal Alpha K Plaster
Alpha K the hardest plaster we stock. It is intended for high quality model and sculptural
Cerrostone Plaster is a fine particle medium strength plaster
Crownstone Plaster is an extremely hard die stone plaster used for crown and bridge modelling
Dentstone HXD is a dental hard plaster (stone) for the manufacture of dentures where its higher
Denstone 'KD' Plaster is a pale yellow dental "stone" used on a base of dental
Flasking Plaster for the Dental industry is specially formulated for flasking..
Hard Dental White Plaster a high quality alpha plaster...
Hard Dental Yellow Plaster
Keradur is a press plaster for the ceramic industry used for the dies for press mould
Keram Blue Plaster is a ceramic industry slip casting plaster..
Keramicast Plaster is used in the ceramic industry where higher mould life is needed Lflask
Flasking Plaster for dental prosthetics more accurately matches the shrinkage of acrylics.
Model Stone Plaster
Prestia Modell plaster is the top of Prestia's range. It is extremely hard and dense, giving
Newcast Plaster Made by BPB Formula
Pottery Plaster is the basic "beta" Plaster used extensively in slip casting of ceramics.
Prestia 2500 Plaster is a coarse, general purpose casting plaster.
Prestia Casting Plaster, a general purpose beta plaster for the fibrous plaster
Prestia Ceram No.1 is a plaster specifically developed for tableware applications
Prestia Lafarge Classic is a quick setting general purpose casting plaster. Ideal for fibrous
Prestia Creation Plaster (formally known as Dur). A mid range casting plaster
Prestia Dur No1 is a mixture of alpha and beta plasters (around 50/50) Making it a good mid range
Prestia Expression Plaster. A very hard alpha plaster for general casting such as gift ware.
Procast Plaster by Lafage is aimed at the fibrous plaster market but has numerous other uses.
Prestia Tradition Plaster. A slow setting General purpose beta plaster. Made in France Surgical Plaster
Surgical Plaster is a very pure, white product held to a colour standard for use in medical
Plaster of Paris to the ... Strength, Brinell Hardness, Use, Market. P/W, W/P, lb/pt, Psi, 200N/mm² ...
and plaster of Paris. .... relative elongation, 50 percent; Brinell hardness, 200-300 MN/m2 (20-30 kgf/mm2). ...
tri-sodium citrate retarder, retarding agent.
Brinell hardness, 167 MPa. CAS registry number, 7440-70-2 .... as well as, in its hemihydrate form being more well known as Plaster of Paris. ...
"waterproofing plaster of paris" Hydrocal-White - gypsum cement which has a gradual setting time and long period of plasticity and is useful for solid and hollow castings of figurines and lamp bases.
"Waterproofing casting plaster" Hydrocal-FGR95 - add fibre for strong, resilient products. will adapt to deep patterns. Its expansion and strength are affected by the fibre used.
Hydrostone - strong and resistant to wear. high compressive strength makes it the ideal gypsum cement for ram press molds.. art and novelty castings, moulds, figurines, anchoring materials, density, fill applications, lamp bases, and case moulds.
Pottery Plaster No. 1 - slip moulds, jigger moulds.. strength, surface integrity and absorption... cantilever bending stress... freely supported, with a cross-section... such Gardencast, Forton MG,
Ultracal 30 - Low expansion and absorption for high tolerance tooling... hardness, accuracy and no efflorescence.
Herculite No.2 and Crystacast progressively denser lower yields but high surface hardness
Ceramical - A low consistency form hydrocal compounded to produce a dense, smooth-wearing die material for mechanically pressing clay ware...
Herculite LX compressive strength, porosity, impact resistance, porosity, dry density, surface absorption/suction, resistance to abrasion. Wet flow and curing time, hardening..
Build your own castles, dungeons and stone buildings for wargaming terrain, model railroads and
model displays Hirst, hurst, hearst, chainmail, castle moulds, castlemoulds, hurst arts, pyramid,
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mould making, moulds, plaster casting, making pyramids, pyramid making, pyramid building,
tower building, making towers, building towers, railroad, model, roman ruins, building ruins,
making ruins, cathedral, dungeon, fantasy, wargame terrain, silicone rubber, silicone rtv, stone
walls, diorama, making dioramas, diorama making, diorama building, medieval architecture,
gothic architecture, roman architecture, miniature buildings, battle, war games, role playing, hirst
Hirst Arts Fantasy Architecture .Cast Your Own Blocks - Build Your Own Castles Makers of
Silicone Rubber Moulds What's New Fieldstone Tower Building Instructions Round Tower
Building Instructions Round Tower Mould Fieldstone Tower Mould Worn Floor Tile Mould Hirst
Round Tower Fieldstone Tower Products Instructions Welcome to Linka World! - Your online
source for Linka products, tips, and ideas Linka, mould, rubber, plaster, diorama, wargaming,
terrain, scenery, building, model reusable rubber moulds make scale model buildings, bridges,
walls, and other scenery structures out of plaster -
perfect for dioramas, wargames, and railroad
layouts Linka® is a system of reusable, rubber moulds used to make highly detailed brick, stone,
and timber buildings and other scenery structures. They are ideal for railroad layouts, dioramas,
military modelling, Christmas or holiday villages, craft projects, and tabletop wargaming..
Plaster-Of-Paris & Artists' Casting Plaster, Waterproof Cassini's ...waterproof plaster-of paris for exterior plaster repairs or outdoor statues, sculptures, ... Prices include VAT. Normal delivery next day. ..University of Hertfordshire, Hatfield, Welwyn Garden City, St. Albans, 01707... 01727..
Plaster for external use.. repairs to marble statues, external waterproof or damp-proof plasters.... medical plaster casts,.. Armature work with sculptors tools and chisels... bas relief and intaglio work, equally suited to reproducing very high gloss or polished finish...
Sculptures, garden plaster-of-paris statues statuary, forensic applications. Plaster-of-paris for footprint casts, fossil impressions and recording...
Statues, figurines, water features, sculptures and all outdoor work. Also marble/stone repair & restoration (cast or applied).
A particularly strong plaster. Water/weather-resistant; good impression capability; extremely hard surface and very resistant to breakage, chipping, etc.
Casting work lends itself to improvisation both with materials and methods, and it is very satisfying to see a work-of-art evolve from what-starts- off-as just a powder or a liquid. All the materials mentioned below are in the drop-down menu; use the tabs below this table for more about the methods.
Plaster-of-Paris Moulds & Casting
‘Plaster-of-Paris’ can mean the powdered material, the finished work - or the art-form; ‘casting plaster’ is just a more specific term for plaster-of-Paris while it is still just a powder, e.g. in the bag, etc. Unlike other types of gypsum, casting plaster is very pourable once mixed with water but sets quite suddenly, usually at somewhere between 10 and 30 minutes, depending on the particular variety. Making Plaster-of-Paris Moulds Although it can be sculpted as a 'negative', more usually a plaster mould is formed from an original or prototype. This may be part or all of an existing object, or a master modelled for making one or more copies, and might be a pot, a plate, a figurine or even part of a car. Originals made of pliable materials such as plastic, rubber, silicone and plasticine do not normally need a release agent (e.g. vaseline), but heavily-detailed or shiny surfaces can be difficult to part - metal, glass and ceramics all require a release agent, however flexible moulds (see below) are normally used for rigid materials and for copying originals with heavy or undercut detail. Intricate or hollow moulds can be formed in sections which can be held together with rubber bands or tape, etc., and the joint-lines levelled off after separation. ¶The mould box can be any simple plastic container or frame lined with a plastic sheet, etc., with the object being firmly fixed or suspended in the box - tupperware containers, washing-up bowls, old cardboard boxes, even plastic footballs cut-in-half are all perfect. If containment is difficult - as with a large panel, or other fixture - the mould box will have to be devised around or over the original ensuring that the junction with the sides of the box is completely sealed with plasticine, etc. Hessian or wire mesh can be included to add strength to slender or large areas of the mould. If the original is made of a soft substance such as paraffin wax which can be scooped or melted out of the mould, whole-object castings can be made (vents can be drilled into the mould to prevent air being trapped). Fine Casting or Artists' plaster is suitable for most work, but Herculite No.2 plaster can be used for moulds that will be used repeatedly; for maximum durability, however, use Crystacast. Setting time depends on the plaster used, but is usually under 30 minutes. ¶Semi-flexible casings or moulds can be made with Plaster-of-Paris bandage using the same material and technique as plaster-casts for bone fractures (see Body Moulding below).
Making A Cast When it comes to making a cast from rigid or flexible moulds, Fine Casting or Artists' plaster is usually quite sufficient if the finished work is unlikely to be handled much. A typical plaster for more portable objects is Herculite No.2, but Crystacal R should be used if true whiteness is important. For maximum hardness use Crystacast or, for the best resistance to breakage, use Cassini's or Jesmonite. Depending on the casting material, soft soap or other parting agent can be used to seal the mould surfaces. Moulds must be completely dry if used for casting metals because the steam from trapped moisture can cause molten metal to be blown out - the mould may need drying in a low oven before use (not a microwave!). Any under-cut detail in the mould will prevent separation if the casting is plaster, metal, etc. - but this won't matter if the casting is a one-off and the mould can be broken away without damaging the finished article.
A flexible mould is normally used for originals with any relief or undercut detail, etc., and there are several ways this can be done. 1. Alginate
can be used for making life-casts as described lower down but is also widely-used for copying figurines, small ornaments and decorative mouldings - especially in restoration work; alginate comes as a powder which is mixed with water and can either be applied as a paste or, using a weaker mix, the original can be immersed in the gel; the mixture sets in about 3 minutes and the mould detaches itself in the process. Alginate moulds are only suited to a very limited number of uses as the material degrades quite rapidly. 2. Latex moulds are often seen in children's casting kits but are also used extensively in the production of objects ranging from chess-pieces to heavy garden ornaments; the raw material is a milky fluid and moulds can be made by repeatedly dipping the original or by painting the liquid on in several coats; however, by adding a thixotropic agent (thickener), the latex can be spread on ('brushing latex') - provided there is not too much heavy detail. With a supportive jacket or backing of plaster or Modroc, etc., latex can be used on bulky or lengthy originals, e.g. statues, decorative cornices, etc.
3. RTV silicone (cold-cure rubber) moulds can be formed by placing the original in a pot or container with the liquid rubber being poured in the same way as a plaster block-mould; large, flat areas can be reproduced by forming a barrier around the perimeter of the original then pouring in the silicone to form a rubber layer or mat. Moulds can be built up in sections, but successive layers must be separated with an effective barrier to prevent adhesion. (RTV silicone is a two-part material and is very different to the silicone used in mastic sealants). A more efficient, two-stage process is often used for larger moulds: a layer of clay or plasticine is spread over the original; this is then placed in a suitable mould-box and plaster-of-Paris poured in; once set, the plaster case is lifted off and the clay filling removed; when the plaster case is put back over the original there is a void where the clay was; the silicone to form the mould can now be poured into this cavity through holes formed in the plaster case - then left to cure as normal. The plaster case itself may also be used as a mould support for heavy castings. This technique can be adapted for making moulds of wall fixtures, plaques, etc. - effectively turning the assembly on its side. Silicone combines durability with great accuracy - it is therefore widely-used for small to medium-size ornaments and in engineering work where planes and angles need precise replication, and also for copying inscriptions, etc.
As with latex, with the same limitation, a thickener ('thixo') can be added to the silicone ('brushing silicone') so that it can simply be spread on to the original to form a mould. 4. Vinyl rubber (Vinamold, Gelfex, Flexil, hot-melt, etc.) is similar to silicone but the material is first heated in a pan to make it pourable - small projects can easily be managed in the microwave; for best results, the original should be pre-warmed so that the molten rubber can fill all the detail before solidifying; vinyl rubber can only be used on heat-resistant originals and is not as durable as silicone; however, moulds can be melted down and the rubber re-used. ¶Sometimes the shape of the original makes it impracticable to release the mould in one piece - whether using alginate, vinamold or silicone; however, by slicing through the set material (or even carefully tearing it where a sharp blade is not appropriate) - then matching up and strapping the sections together, it is possible to make moulds and produce castings of the most complicated ornaments and figurines, etc; seams or joint lines in the finishing castings can easily be rubbed down later. An alternative is to mould and cast projections, extended limbs, etc., separately - which also makes it easier to introduce reinforcement (dowels or wire) into slender or vulnerable areas.
¶Mould-boxes are rarely very elaborate - plastic food cartons and cut-down milk bottles are ideal. Release agents are not normally needed for alginate or latex, either when making the mould or when making castings; both silicone and vinyl rubber can also usually be persuaded to de-mould from most of the surface types that they are likely to be used with. Vaseline, WD40 and most household polishes, baby oils, etc., can be used to make separation easier, but shellac can also be used to seal particularly difficult or porous originals beforehand. ¶When in use, larger moulds may need support to avoid distortion from the weight of the material used in the casting; tape or light strapping may be sufficient, or the mould can be nestled into a box of dry plaster or sand or, if the mould is formed with a lip, it can be suspended in a jug of water; a mould for a long or heavy object may need a rigid jacket or casing of plaster-of-Paris, modroc or fibreglass, possibly made in two halves with the meeting edges incorporating a flange so that the sections of the support case can be strapped or even bolted together. Alternatively, expanding foam (contained between the mould and an outer box) can afford adequate support for surprisingly heavy castings.
¶The choice of plaster for casting from flexible moulds is much the same as for casting from rigid moulds (see above). ¶Casting resin is a popular medium for casting ornaments and various effects and finishes can be achieved by adding powders or pigment pastes, etc. Fibreglass is also often used when making shell-only models. Polyurethane resin ('Fastcast' or 'Easyflow') only takes a few minutes to set and is widely used for small-scale work such as sets of models, chess pieces, etc. Cold-cast bronze, etc. is made by mixing metal powder with fastcast resin - usually just applied or brushed on as a veneer on the inside of the mould, with either plain, filled or reinforced resin added behind, depending on size. Clear-cast resin can be used for encapsulation in jewellery, paperweights, preserving specimens, etc. ¶Use the tabs below this table to read more about alginate, latex, silicone, vinyl rubber and resin.
Imprints are made by pressing the subject into the wet plaster, so that the mould itself is the finished item; a release agent such as vaseline or a light oil may be needed depending on the material (see Casting above); this technique is popular with parents who want a permanent memento of small hands and feet, and a kilo of Fine Casting or Dental plaster and some plastic flower-pot dishes is all that is needed for two hand and foot imprints. (Use Cassini's for outdoor work).
A plaster 'block' can be made in a basic mould that slightly exceeds the model's shape and size; the block may be made partly hollow by including a light infill foam to save on plaster, and weight. Sculpting is usually carried out when the plaster is quite dry otherwise tools and sandpaper, etc., will clog. Repairs are easily effected since new plaster readily adheres to existing. Crystacal R is ideal for sculpting as it is a very pure white. Cassini's can be used for outdoor work (it does not require painting and is a very true white).
Built-Up/ Armature Work
A layer of light plaster (typically Fine Casting) is built up around a hollow cage or framework (armature). Large pieces such as life-size figures will require wire and rods (not necessarily metal) to make up the frame, to which wire mesh, etc., can be attached. Small pieces can be made using mesh alone. Hessian or cloth is then dipped in wet plaster* and then wrapped over the parts of this frame in successive layers until a sufficient covering and the right shape is achieved. (In the early stages any parts that protrude too much can usually be knocked back in - slightly too far - then filled out again). The final piece can be left natural, sculpted - or smoothed over with a final coat of plaster. *Modroc pre-coated plaster bandage is usually more convenient for small and medium-sized work.
Liquid clay (slip) is poured into a plaster-of-Paris mould. The plaster absorbs water from the clay to leave a hard layer; excess slip is poured away. As the clay dries, it shrinks slightly, detaching itself from the mould surface; once the clay is firm enough it can be taken out of the mould - which is then dried for re-use. The process can be adapted for making pots, etc., using split-moulds (the slip is bathed over the inside of the mould and the excess drained off) - or for solid objects, including tiles, but is not suited to heavy detail. Denser plasters can be used for high-quality work, however lighter plasters absorb water faster, allowing a shorter mould cycle.
This single-stage technique is very popular with mothers-to-be who want a memento of their body shape during pregnancy. A pre-coated plaster-of-Paris bandage* is used to make the mould. Tummy and chest are first covered with petroleum jelly, then two or three layers of the moistened bandage are applied more-or-less as a thin poultice which sets very rapidly. The whole process takes 15 minutes-or-so and, although the result is a solid veil, it captures all the shape and holds a surprising amount of detail - and is great fun to decorate. Nursery scenes, cartoon and animal motifs are very popular, but in the right lighting and position, a plain, natural look can be very dramatic.
View the Body mould & mum-to-be kit. There is more information about this simple moulding technique via the link above this table. *Modroc bandage is a pre-coated plaster bandage which is dipped in water for 3 or 4 seconds - it then becomes quite 'pasty' and is applied/draped over the skin and then smoothed into the body's contours.
Life-Casting (Face, Body, Hands, Feet)
This involves making a flexible mould which is peeled away from the subject once set; the mould is formed in alginate gel which sets in 2 - 3 minutes and will even hold such detail as the pores of the skin. This is the negative which is then coated or filled on the inside with plaster-of-Paris; when the mould is removed the end-result is an exact plaster replica. The method is popular with parents who want to make a cast of their baby's foot or hand. The foot can either be immersed in the alginate, or the alginate can be spread on (using a thick mix) and is peeled off once set. The mould can then be filled with plaster-of-Paris. A hard plaster such as Herculite No.2 is normally used for life-casting, but if the piece is to be left 'as-cast' a pure-white plaster such as Crystacal R can be used. The cast of the 'Hand Emerging' shown below was made in a tuppperware box and was completed in just 30 minutes.
Working with Alginate and Plaster-of-Paris - Casting a Hand
On larger body-areas the alginate will need a supportive backing: if the alginate is applied directly to the tummy and chest and then bandaged in-situ as for the Body-Mould process above, the result is a mould which is sufficiently flexible that it can be separated from the body without distortion; plaster and layers of fabric are then applied on the inside to create the plaster replica, which is a shell rather than a solid mass. This is the method used by mums-to-be who want a naked-skin replica of themselves at the later stages of pregnancy, and is definitely a two or even three-person project, requiring 20 - 30 minutes of close co-operation to make the mould. The casting is often painted - metallic spray is very impressive. Life-cast & mum-to-be kit. Using the same technique, whole body or whole head casts, etc., can be made by casting front and back separately then joining them. Permanent moulds 'from life' using silicone or latex are normally produced from a plaster-of-Paris cast of the face, etc., that has been made using an alginate mould.
Painting & Decorating
Casting plasters will receive most types of paint, but large pieces may take several days to dry sufficiently to avoid the possibility of lifting or peeling of paintwork. A coat of PVA sealer
will improve adhesion and make application easier and more economical for most paints and sprays, particularly on the softer plaster types. The sealer should be applied quickly and lightly to avoid brush-marks being left. In general, plaster objects will deteriorate if left outside or if exposed to moisture - sealing and painting only delays the process - however Cassini's casting plaster does not need any sealing or protection out-of-doors and can be left 'as-cast', or sculpted, etc.
How Much Plaster? As an illustration, it takes about 1.5kg of ordinary Fine Casting plaster to make a block the size of a brick but it would take 2.5kg of Crystacal R plaster - because it is denser. First work out the volume of the finished piece. If this is difficult to measure directly as with a latex mould for instance, use a calibrated jug to see what volume of liquid would fill the mould - or what it would displace - in litres. Multiply this figure by the relative density in the bottom table to find the weight of plaster powder needed in kilograms - then add a little for wastage, etc. So, for a mould that holds 0.4 litres, if using Crystacal R plaster - which has a relative density of 1.67 - you will need around 0.7kg for each casting (0.4 x 1.67 = 0.66kg).
Mixing Plaster-of Paris. Unless you are already experienced and have an eye for the right amounts, always weigh the plaster and use a calibrated jug, etc., for measuring the water, using the water to powder ratios shown in brackets in the left hand column of the table below, e.g. Fine Casting Plaster (70:100) requires 0.7 litres (i.e. 700g) of water for every kilogram of plaster powder used. A small test piece to check the setting time in the particular conditions is always a good idea. Old plaster or plaster that has been stored in damp conditions sets more quickly, as does unset plaster brought into contact with freshly-set plaster. Setting times can be retarded by 10 - 15 minutes simply by adding culinary lemon juice at the rate 1 - 2 teaspoonfuls for each litre of water used. If you haven’t used plaster-of-Paris before you will probably be surprised how runny the fresh mix appears to be.
Weigh out the required amount of plaster into a clean dry vessel; break up any clumps in the powder at this stage.
Measure out the correct amount of water; use tap water only. Use a clean container that will hold around 3x the volume of the loose plaster powder, to ensure plenty of space for mixing the paste.
Gently sprinkle the plaster into the water and allow the material to sink; allow a few minutes for the powder to properly soak.
Mix slowly and firmly using strokes of the stirring tool that limit any air entrainment, i.e. avoid any beating or dropping action; if using an electric drill with a stirring attachment, use a low speed setting.
The fluidity will vary with plaster type, but the mix should have an even consistency, with no bubbles or swellings under the surface, and no free water on top or at the sides of the mix; make certain that there has been no clumping in the corner of the bucket, etc. Tapping will help to bring any air bubbles to the surface.
Allow the mixture to stand for a minute or so before using, and pour gently if making a solid piece to avoid splashing and air entrainment. Again, if feasible, firm tapping of the mould/box will release air bubbles.
The mix can be become quite warm as setting progresses, depending on the normal set time for the particular plaster (see table above), the amount used and ambient temperature, etc. It is usually safe to remove the cast at about 2x set time, when the initial warmth has subsided.
Clean any non-disposable utensils and containers thoroughly in water immediately after use, but never down a drain or sink, etc. Alternatively, if using a flexible plastic bucket, etc, allow the excess plaster to completely set, and crack it off for disposal.
Never attempt to dry any plasters in a microwave or pour molten material into moulds until the plaster is known to be completely dry, as the plaster may explode! Plaster can become very warm during setting - never attempt to embed or mould whole hands, feet or fingers, etc.
Poor quality moulds are usually the result of incorrect curing and premature separation from the prototype/master. Poor quality plaster casts are usually the result of using moulds which are still wet, the plaster mix is too rich, or premature demoulding - allow at least double the stated set-time for intricate work.
Technical information and water-to-powder ratios. Density is a good indicator of impression capability and surface absorption, but the values are approximate and are dependent on the correct water:powder ratio and consistent mixing, etc. Strength characteristics are typical 7-day values.
Plaster-of-Paris Type (Water:powder ratio, by weight).
‡Yield is the approximate volume of finished plaster-of-Paris work measured in litres for each kilogram of dry plaster powder used in the mix.
There is usually some latitude in the choice of plaster - both surface density and absorption can be adjusted with a small change to water content.
†Cassini's has very high flexural strength (resistance to breakage and impact damage). *Suitable for use outdoors, water- and weather-resistant.
For the US Gypsum products Hydrostone, Ultracal 30 and Hydrocal, the UK equivalents are Crystacast, Crystacal R and Herculite No.2 respectively.
Delivery is usually the next working day for most of the UK, but please allow an extra day for 'Highland and Island' addresses and larger orders. Sepal-Maragon, 1 Woodhall Farm, Hatfield, Herts, AL9 5NU. 0800 6347410 & 01707 276156 email@example.com. VAT Reg. 911 1205 86.