Coating wax

Dispersion at temperatures of 90—110°C is a common final step io European mills processiog wax-coated old cormgated containers. Dispersion temperatures less than 90°C are reported to reduce wax particle size to improve pulp drainage properties on paper machines while improving paper strength (45). Dispersion has been used to reduce hot-melt adhesive, plastic coating, and asphalt particle size. These low density particles can then be removed from the pulp by flotation (46). 

Figure 12 shows an optional step at the end of the process ia which the siUca is chemically reacted with a siUcone oil, typically polydimethyl siloxane, to render the product hydrophobic. Other aftertreatments are also commonly employed, such as wax coatings that enhance the performance of precipitated siUcas used as flatting agents ia paints (78). 

Disclosing waxes or pressure indicating pastes, are used in fitting a dental appHance to estabhsh the location and extent of high spots or pressure areas, as on impressions and complete dentures. They are very soft, salve-like compositions that are painted onto the tissue side of an impression or denture. When the wax-coated denture is seated in the mouth, the soft paste is forced out of the areas showing hard contact between the denture and the mucous membrane. These areas on the denture can be easily marked and material removed from the denture to reheve the premature or hard contact. 

It is applied to cut slices of cheese by dipping or spraying. Some manufacturers use it in the wax coating on cheese rinds instead of on the cheese itself. In grated cheese, a dry mixture is used, usually with cellulose to prevent caking. 

Closure liners of pulpboard or cork, unless specially treated with a preservative, foil or wax coating, are often a source of mould contamination for liquid or semi-solid products. A closure with a plastic flowed-in linear is less prone to introduce or support microbial growth than one stuck in with an adhesive, particularly if the latter is based on a natural product such as casein. If required, closures can be sterilized by either formaldehyde or ethylene oxide gas. 

Protective coatings and lacquers may be applied as a roller or spray coating, usually based on vinyl, epoxy, polyester, phenol-alkyd resin, or wax coatings. 

Very few CBAs have been developed for use with polymers for food contact applications. The most commonly used CBA, which has approval, is powdered wax-coated sodium bicarbonate/citric acid, which decomposes at 160-210°C... 

While this decomposition reaction is slow at room temperature, the disproportionation process can be accelerated by heat, certain catalysts (e.g., metal ions), and light. Traces of alkali metal ions are normally present in aqueous solutions stored in glass bottles, so plastic or wax-coated glass containers reduce the concentration of metal ion catalysts. Brown-colored containers limit the wavelengths of light that can be absorbed by the solution, restricting the initiation of the disproportionation reaction. 

Corrosion resistant or wax-coated sprinklers have a slower operating time than uncoated sprinklers. Their use should be carefully evaluated. 

Decomposes Tough waxy to solid Wax coatings of food containers... 

Type 3 No 6 Target Marker Bomb consists of a steel cylinder with round nose and conical tail, provided with fins. The filling consisted of WP-filled steel pellets contd in steel canisters. The space not occupied by pellets was surrounded by loose WP. The canisters were covered with heavy wax coating. The nose-piece contd a Gaine well surrounded by charge of Type 98 Expl (p 113, Fig 85)... 

Rifle Bullet Test. AN at a d of 1 2 g/cc was unaffected in 10 trials. The presence of small amts of wax-coating did not affect these results (Refs 122 a 128)... 

RDX/SantowaxM 91/9 RDX/Be Square Special Wax The compns containing the Santowax M (product of Monsanto Chemical Co Santowax M is a meta-diphenyl benzene, a hard microcrystalline wax very stable to heat with a mp of 181-84°F) were found most suitable with respect to ease of manuf and non-adherence to punches and dies. They were more satisfactory than the standard Compn A-3. Both the Santowax M and the Be Square Special Wax coated the RDX crystals well the polyvinyl acetate/dibutylphthalate did not. The PVA/DBP, during the RDX coating... 

Sixty-four waxes or waxy materials were screened for possible use in Compn A-3 type RDX mixes (Ref 47). Continuous pelleting tests in comparison with standard Compn A-3 (made with Stanolind 170/5 wax) were conducted. Four of the wax coated compns were considered comparable. The waxes used in these four com-... 

It was soon determined that the wax coating on the RDX melted when placed in the molten TNT and was preferentially replaced from the RDX surface with molten TNT. Ref 69 supplies the technical explanation for this... 

Of the two compns, the wax coated RDX is the preferred. It was concluded that both these compns are, on the basis of laboratory and small scale tests, less sensitive than Compn B to impact and rifle bullet tests, but not as insensitive as... 

In tests (Ref 30) to determine the effect of liners and coating on the sensitivity of 50/50 Pentolite charges contained in bombs it was concluded that very little effect was obtained with a wax coating on the inner surface of the bomb, but an asphalt dip reduced the detonations considerably. The tests conducted were rather limited in the variety of waxes tested. Subsequent tests in 100-lb bombs were somewhat inconsistentwith the initial finding. Seven hundred-fifty lb general purpose bombs loaded in the 1970 s did use both a nose pad and liner of a bituminous material... 

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