Scrim

SCRIM originated from research by TRL Ltd (United Kingdom) and was developed by W.D.M. Limited. W.D.M. Limited is the sole licensed manufacturer worldwide. SCRIM is a registered trademark of W.D.M. Limited. 

The measurements are taken with a standardised - not entirely blocked (34% fixed slip ratio) - smooth wheel positioned at a 20° angle to the direction of travel, loaded with a 1962 N load. The speed at which the measurements are taken is either 80 or 50 km/h (test speed). The 80 km/h test speed is used in motorways or other roads where the speed limit is greater than 80 km/h, whereas the 50 km/h test speed is used in all other cases. 

Skid resistance data are recorded continuously and stored as an average, usually for each 10 m section of road this length is called length for the mean value . 

The wet-road skid resistance is determined by the SFC known as SCRIM coefficient, SC. The result is expressed in two decimal points and it ranges, theoretically, from 0 to 1.00 units (the greater the value, the higher the skid resistance provided by the pavement surface). 

The measurements are directly affected by the test speed and to a lesser extent by the temperature of the air or road at which the measurements are taken. 

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The reinforcing ply of laminates may be a woven fabric scrim, a nonwoven web of polymer monofilaments, or a mat of fibers. One of the most common reinforcements in use is also one of the oldest, ordinary cellulose fiber paper. 

Heavy-duty wiping materials and some disposable garments are made from nonwoven ceUulose mats which are reinforced with a synthetic fiber, eg, nylon scrim network the spacing of the synthetic threads is 0.5—1.0 cm (108). 

Softening and cure is examined with the help of a torsional pendulum modified with a braid (65), which supports thermosets such as phenoHcs and epoxies that change from a Hquid to a soHd on curing. Another method uses vibrating arms coupled to a scrim-supported sample to measure storage and loss moduH as a function of time and temperature. An isothermal analytical method for phenoHc resins provides data regarding rate constants and activation energies and allows prediction of cure characteristics under conditions of commercial use (47). 

BP. These nitrile alloy membranes are compounded from PVC, flexibilized by the addition of butadiene—acrylonitrile copolymers, PVC, and other proprietary ingredients. Typically reinforced with polyester scrim, NBP membranes are 1 mm thick and have a width of 1.5 m. They ate ptedominandy used in mechanically fastened roofing systems. NBP membranes exhibit excellent teat and puncture resistance as well as good weatherabihty, and remain flexible at low temperatures. They ate resistant to most chemicals but ate sensitive to aromatic hydrocarbons. The sheet is usually offered in light colors. The physical characteristics of NBP membranes have been described (15). 

Medium-density mat with flexible facings of paper or scrim stitched through. Quilts are used for acoustic absorption behind perforated or slatted panels and ceilings. 

As with tissue, woven glass cloth is used for decorative or acoustic purposes. Additionally, close-woven fabrics give improved fire-safety properties and are resistant to mechanical abuse. Glass cloth or scrim of an extremely open weave is used on insulants as a key for mastic or hard-setting finishes. 

Two-Faced Aluminum Foil over a Core of Glass Scrim Webbing... 

Another available product has two faces of aluminum foil over a core of glass scrim webbing it is coated with asphalt. The membrane is 0.012 in. thick. This material has not been tested as a barrier against diffusive flow of radon, but its performance should be similar to that of other foil-faced products. Seams are sealed with aluminum tape. 

Figures 7.8(a) and (b) display piloted ignition results for a metalized polyvinyl fluoride (MPVF) film of 0.2 mm thickness over a 25 mm fiberglass batting [14]. The MPVF film was bonded to a shear glass scrim (with no adhesive or significant thickness increase) to prevent it from stretching and ripping. The unbounded MPVF film was also tested. This shows several features that confirm the theory and also indicate issues.

In the course of curing, the viscosity vanes from thin to syrupy liquids. This is convenient for impregnating reinforcing materials, such as fiberglass scrim, used in making wiring or circuit boards for electronics applications. 

Coated fabrics extrusion of coated scrim for tarpaulins. .. 

There are four major types of barrier materials used now in the US for military purposes a)Water-proof b)Greaseproof c)Water-vapor-proof and d) Combinations of a,b c. Almost all the barrier materials in use today are composed of several layers or plies. The plies are usually cemented together with suitable adhesives(/< mi anrs) to form a laminated structure, although several other methods of making multi-ply sheets are also used. Materials used for making plies include kraft paper, cotton scrim, aluminum foil, polyethylene, cellulose acetate, Mylar, etc... 

ADVANCES IN CHEMICAL FflYStCS VOLUME II EAiT 111 t. FHIGOGINE MdSTLiAETA. VUCE Scrim tm n... 

Thickeners, fillers, and thixotropic agents are also commonly used to control flow and the bond line s thickness within a joint. Scrims, carriers, and woven reinforcements are other methods commonly used to control bond line thickness. 

The viscosity of epoxy resins and curing agents can be used to control the bond line thickness within the adhesive joint. But the bond line can also be regulated by the incorporation of fillers, by the use of scrim cloth or woven tapes as internal shims within the adhesive itself, or by the careful regulation of the cure cycle. 

Tape and film are the most common forms of solid epoxy adhesives. Tape and film are terms that are used rather loosely for adhesives in a thin sheet form. The term tape generally refers to an adhesive that is supported on a web of paper or nonwoven fabric, or on an open-weave scrim of glass, cotton, or nylon. Films, on the other hand, are free of supporting material and consist only of the adhesive. Both tape and film products may be accompanied with a release liner depending on the tack or blocking characteristics of the adhesive. 

Application requires a relatively high degree of care to ensure nonwrinkling and removal of separator sheets. Films are often supported on scrim that distributes stress in the cured joint and ensures a uniform bond line thickness throughout the bonded area. 

There are also other products produced such as foamed vinyl fabrics (Chapter 8). One method of fabrication is to coat a thin layer of solid plastisol on embossed release paper, then coating a thicker coating of foam plastisol and finally layering on a cloth scrim. The composite is... 

INTEX RFL 31 is prepared so that it can be padded directly onto any synthetic fibers. It increases the adhesion of Hypolon, natural rubber and synthetic rubbers to the fibers. It imparts dimensional stability to scrims to make them easier to handle in processing. 

Scrim-based lumber (Hutchings and Leicester, 1988 Seale, 2004) is a product that utilizes low grade small diameter wood (76-203 mm). It was initially developed by... 

Figure 11.14. Scrim-based lumber uses young wood or thinnings from short-rotation plantations in a simple process to manufacture an engineered product of uniform quality (courtesy of TimTek Ltd).

One of the most successful industrial applications of polymeric catalytic membranes is the Remedia Catalytic Filter System to destroy toxic gaseous dioxins and furans from stationary industrial combustion sources by converting them into water, CO2, and HCl. The system consists of an expanded polytetrafluoroethylene (PTFE) microporous membrane, needle-punched into a scrim with a catalytically active PTFE felt. The catalyst is a V2O5 on a Ti02 support. The microporous membrane captures the dust but allows gases to pass to the catalyst where they are converted at temperatures as high as 260° C. 

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