The windscreen is one of the most uncomfortable components of an armoured vehicle, and rarely features in defence news. The thickness of steel plate can be reduced or changed to composite materials. The transparent armour can't be bent as easily, as it must withstand bullets, and allow the driver to see the street. Importance: India has been heavily reliant on it for the past. Things could be about to change.

The Defence Research and Development Organisation (DRDO) has signed an agreement with the CSIR-Central Glass and Ceramic Research Institute (CGCRI) in Kolkata to use the institute as its technology partner to create lightweight bulletproof glass for India, a Rs 50 crore project that is set to run for four years. The work is being done in collaboration with the DRDO's Naval Materials Research Laboratory in Maharashtra and the Terminal Ballistics Research Laboratory, Chandigarh. It is well advanced and the next step is from lab-bench to production line, which will be through an industry partner that DRDO will select, officials say.

The technical claim is lofty. The project leader at the institute claims the material should be able to withstand repeated rounds fired from 100 metres, subjected to V and VI level of protection as required by BIS, and also reduce the weight and thickness of imported alternatives by 30 to 50 per cent. The base is a glass-ceramic and the crystals are just a few nanometres in size and evenly dispersed in an engineered glass matrix.

The crystals are grown in a carefully controlled heating process and the resulting panel remains transparent. According to the reports, a few months back the institute's officials signed agreements with five multinational companies for expanding its commercial possibilities and the lab has already developed early panels which were to the extent of its expectations already and the reports from Kolkata suggest that.

How to determine how a 50 per cent weight cut is to be applied is simple. Heavy glazing on an infantry vehicle, a mine protected truck or patrol boat increases the axle load, consumes fuel and reduces payload. Take a bit of it out and a more racked chassis can carry more troops, more ammunition or better electronics. The same material may be used in the future in naval vessels and aircraft, where every kilo counts, says markets outlet Whalesbook. Presently, it's a speculation. It is currently aimed at ground vehicles.

Policy behind the project is huge, but the money is not. Analysis by the Manohar Parrikar Institute for Defence Studies and Analyses shows that the defence budget for the next fiscal year (2026-27) is set at Rs 7.85 lakh crore, a 15.2 per cent increase. Capital outlay stands at Rs 2.19 lakh crore, which is almost 20 per cent more than the previous year. Three quarters of the capital acquisition budget is dedicated to the domestic industry, which is around Rs 1.39 lakh crore. The amount of research and development under the capital head is planned at Rs 17,250 crore. In comparison, a Rs 50 crore glass project looks small, but parts of such projects are where dependency on imports is likely to be lurking.

Above are pie charts illustrating the shape of the problem. Pay, pensions and running costs still take up the majority of the defence budget with only around 29 per cent for capital spending. Within the last 10 years, the capital share has hovered around 27 per cent, which is below the 40 per cent considered to be healthy by many analysts. If a rupee has to be remunerated abroad on the purchase of a small item, such as glass, it is a rupee that could have been invested at home.If a rupee has to be sent abroad to buy a small item like glass, it's a rupee that could have been invested domestically.

The production numbers give us an idea of why scaling is important. Indian defence production stood at Rs 1.54 lakh crore in 2024-25, with the public sector accounting for about four-fifths of that, and the figure was increasing by about 8 per cent annually since 2016-17. The government has set a target of Rs 3 lakh crore by 2028-29, a figure that requires an annual growth of almost 18 per cent. It won't happen if you rely solely on a headline platform. Indian Defence trade papers and various studies, such as by the Stockholm International Peace Research Institute (SIPRI), have highlighted that many of the systems developed by Indian scientists continue to rely on imported subsystems. Transparent armour is just such a subsystem.

A world-wide slant as well. Ukrainian armies to those in the Middle East have spent the past few years discovering how fast supply chains can constrict at a moment's notice if demand increases or export licenses are delayed. The know-how is kept close to the vest by countries that have a well-developed glass-ceramic and advanced ceramics sector such as the United States, Germany and Israel. Buyers who can't create their own clear armour are open to their politics and prices. If it works, one could imagine an Indian product being sold to export customers in friendly countries that also have similar limitations, particularly at a lower price.

However, a sober reading is warranted. There is a distinction between laboratory panels and factory panels. The production of large sheets of glass-ceramic involves many steps: producing in uniform quality, cutting, laminating and certification, and all of these steps can result in failures that would not occur in a small specimen. Cost is determined by yield rates. The list of failed prototypes for Indian defence is full of potential projects that failed to get from the trial stage to production orders. The elegance of the chemistry is of far less importance than the choice of industry partner, the size of the first order and the speed with which the Army and others take up the product.

The opening is the truth for private suppliers and specialist glass makers. The state has indicated its support for domestic buyers and DRDO has been transferring technology to industry with greater enthusiasm than ever before. However, a firm order book is the requirement of a company that invests in furnaces and coating lines, rather than a promise. With a clear procurement commitment, the project may be a blueprint for the other non-glamorous inputs if DRDO can manage to team it up with a clear procurement commitment. If it doesn't, it will be one of countless good ideas that passed the lab hurdle and that's it.