Spray Hard Coat Glass Vs CVD Hard Coat Glass


If somebody tries to sell you cheap reflective glass saying it is “Hard Coated”, the first thing you should ask is “Is it spray hard coat or CVD hard coat?”. Spray hard coat could be termed as a primitive and is relatively cheaper, in this one the chemical composition is sprayed over glass which would be in a semi solid stage (online process). Most cases, the coating tends to be uneven and deposition rate would be poor. In most cases the coated side appears yellowish.

CVD (Chemical vapor deposition in atmospheric pressure) on the other hand is far superior and the latest. Here, the chemical composition is vaporised and then allowed to deposit on semi-solid glass (online coating) in a controlled manner, achieving high deposition rate and the coating would be even. In most cases, the coated side would have a silver appearance.

It would be a disaster if spray coated glasses which come at cheap rates are used (especially when it is mis-sold with the name “Hard coated reflective glass”) in buildings. Below are some pictures for reference.

Spray Hard Coat – Coating peel off

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News on Glass & Refractory World, week# 17


° Asahi Glass To Build 1st S American Plant In Brazil; Asahi Glass Co. (5201) said Monday it will take a step into the Brazilian markets for construction and automotive glass with a roughly 40 billion yen production base in the state of Sao Paulo.
The factory complex (its first in South America) is scheduled to open in 2013 and expand in stages until 2016.

° BHEL to add capacity for glass insulators; The Ceramic Business Unit of Bharat Heavy Electricals Ltd, which has manufacturing plants in both Bangalore and Jagadeeshpur in Uttar Pradesh is also setting up a plant to manufacture glass insulators for transmission lines.

° HNGIL to invest Rs 5,000cr in 5yrs to hike production capacity; Hindusthan National Glass Industries Ltd today said it plans to invest up to Rs 5,000 crore in the next five years to set up new facilities and expand existing capacity.
The firm, which had a total production capacity of 9.40 lakh tonnes in the last fiscal expects it to go up to 12 lakh tonnes in 2011-12.

° JAPAN – Resumption of Production at AGC Asahi Glass Kashima Plant; Kazuhiko Ishimura, president and chief executive officer of Asahi Glass Co. Ltd. (AGC), provided an update on the resumption of production at AGC Asahi Glass Kashima Plant, which was severely affected by the earthquake in eastern Japan. Ishimura noted that restoration of the float glass facility for architectural flat glass has been completed, and suspended production/shipments have resumed.

° Pittsburgh Glass Works to add NC plant; PGW said it will establish a new manufacturing facility in Elkin, N.C., that will employ more than 260. Hiring is expected to begin in 2012. The new plant will produce automotive glass products for OEM and aftermarket organizations within the automotive industry, due to continued surging demand for automotive glass parts.

° Taiwan Glass to Harvest from Low-E Glass Investment in 2011; Taiwan’s largest manufacturer of high-tier glass, will gradually enjoy harvests from investing in low-E glass in Changhua Coastal Industrial Park of central Taiwan, and Chengdu of Sichuan Province and Tianjin Municipality of China.

° Magnesita Awarded Contract for Gerdau Ameristeel’s Sayreville, New Jersey Facility; Magnesita Refratários S.A. announced that Gerdau Ameristeel, a leading producer of long steels in the Americas and one of the major suppliers of specialty long steel in the world, has awarded Magnesita a contract to manage all refractory needs for Gerdau’s Sayreville, New Jersey Electric Arc Furnace (EAF) Rebar Operations steel mill.

° Tata Steel Sells Majority Stake in Refractory Unit; Tata Steel Thursday said it would sell 51 percent stake of its refractory unit (Tata Refractories Ltd) to Japanese firm Krosaki Harima Corporation. The transaction is based on an equity valuation of TRL at approximately Rs.1,130 crore and is subject to approval of relevant regulatory authorities in India and Japan.