Glazing strength

Therefore, strengthening at the glass surface is directly related to the amplitude of the residual surface stresses. This means that thermally tempered glazing strength is shifted by the thermal residual surface stress amplitude. 

Acryhc modifiers for cement impact strength and adhesion to substrates are discussed in reference 211. Both water-soluble acryhc and acryhc emulsion polymers are used in the ceramic industry as temporary binders, deflocculants, and additive components in ceramic bodies and glazes (212) (see Ceramcs). 

Polycarbonates. Polycarbonates (qv) are pardy crystalline thermoplastics with some disorder in the crystalline part and considerable order in the amorphous part. This disorder conveys high impact strength which, combined with its good transparency and outdoor exposure resistance, makes polycarbonates usefiil for vandal-resistant glazing and outdoor lighting. It is easily processed by extmsion and injection mol ding. Various uv and dame-retardant agents are often added. 

In silicone adhesives used to bond structural glazing assemblies, the silicone network is made of very long PDMS chains and is filled with silica that improves the elastomeric properties of the adhesive. The strength of such an adhesive is strongly enhanced through various mechanisms of energy absorption. 

As stoneware and porcelain can be given a glazed finish on both interior and exterior surfaces, articles made from these materials can be very easily cleaned, even after years of use. The glaze also has an effect on the strength of the ware, increasing it by up to 20%, but certain types of body are difficult to glaze satisfactorily. 

Polycarbonates are condensation polymers made from phosgene and bisphenol A. They have high impact strength and are used in glazing, helmets, and appliance casings. 

Property Summary Acrylics recommended for general-purpose applications, especially for optical decorative, and outdoor use. In sheet stock, cast acrylic has greater strength and transparency extruded acrylic costs less (especially in thin members), and has better formability. Polycarbonates for maximum strength, as in explosion shields. Butyrates for excellent impact resistance, and deep formability. Vinyls for maximum formability and printability. Acetates and vinyls for flexible glazing and guards. Medium-impact styrene and rigid vinyls for lowest-cost molded transparent parts. 

The dynamic abrasion method opens broad possibilities of strength estimation of faience lining tiles (Table 8.6, Fig. 8.5). One could reasonably expect that products, for which the hardness of the glazed side is low, lack a developed intermediate layer. This has actually been confirmed in microscope tests. Both the Japanese tile (DK) and the Kenyan tile manufactured on Japanese technology conspicuously lack the intermediate layer. The cited indicative tests provided a basis for employing the dynamic abrasion... 

---