Surface mat

Other types of glass struetures used include rovings, yams, tapes, rovings fabrics and surfacing mats. 

Gel coat In RP processing a gel coat on the outer surface can be used to ensure a smooth surface appearance and a tough surface. It could contain a thin synthetic fiber veil to improve performance of the gel coat and/or a surfacing mat. It is a quick setting plastic and gelled prior to reinforcement layup. The gel coat becomes an integral part of the finished RP product. 

Many of the above moulds are found on fruits pre- and post-harvest. Most moulds require oxygen to grow. Growth is exhibited as surface mats, sometimes... 

Scheffer, J. R. Garcia-Garibay, M. A. in Photochemistry of Solid Surfaces, Mat-suwra, T. Anpo, M., eds., Elsevier Amsterdam, 1989. 

Figure 51, Different types of glass fibers. (1) Continuous strand mat, (2) Surfacing mat, (3) Chopped-strand mat, (4) Woven roving). (Courtesy of Ownes Coming Fiberglass Corp.)...

Silica gels of specific pore size (e.g., Gasil grades) are becoming important in surface matting of paints. 

Silica fillers play a prominent role in the paste rheology of polyurethane and rubber coating mixtures. Silica fillers are also used for surface matting. In polyurethanes, the layer thickness is even thinner than is used with PVC. Dispersion is enhanced by dispersion aids. Fillers are used at relatively low concentrations in PU formulation. But in rubber coatings, large quantities of calcium carbonate are used to decrease cost. Rheology and reinforcement are adjusted with carbon black. 

The surface of the fill to be compacted is often soft enough to bog down construction equipment. If so, a surface mat of gravel or stone must be applied. Thickness can range from one to three feet. Compacting energy... 

It is most desirable to compact the entire fill depth. Therefore D is taken as 30 feet, 9.14 meters, in equation 3.1, to see if energy requirements are reasonable and attainable. (Assume no surface mat is needed.)... 

Inorganic antiblocking additives are frequently added in concentrations larger than required because they perform other functions, such as surface matting and plasticizer absorption. 

Fiber mat veil An ultra-thin mat similar to a surface mat, often composed of organic fibers as well as glass fibers (Table 2.18). 

Bonnets for mini excavators manufactured by Kobe Steel, Japan, are molded by RTM using a modified acrylic resin and glass fiber fabric. The 850 mm wide x 420 mm high component has double curvature and is molded with a glass fiber strand preform with surface mat on the outer surface, preformed with an organic binder. The resin system contains 100... 

Surfacing mats Decorative overlay surfacing veils Monofilaments Generally less than 1.oz./sq. ft 0.010 to 0.030" thick 5-6 Reinforcements of gel coats Special surface effects in laminates... 

This is a calcium aluminosilicate glass widely used for surfacing mats, glass flakes, or flake glass linings, and for acid resistant cloths. C glass has poor... 

Polyester is primarily used for surfacing mat for the resin-rich inner surface of filament wound or custom contact-molded stmctures. It may also be used in conjimction with C glass surfacing mats. 

Aramid fibers are woven into fabrics for reinforcing polymers. The fabrics range in size from 2-mil (1 oz./yd. ) to thick 30-mil (6oz./yd. ) cloths. Kevlar is available in surfacing mats and cloth form. Surfacing mats can be had in weights of 0.4 and 1 oz./yd.. ... 

---