The Defence Research and Development Organisation (DRDO) has joined hands with the CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI) in Kolkata for a ₹50 crore, four-year project to build indigenous lightweight bulletproof glass for armoured vehicles. The new transparent glass ceramic has already stopped rifle bullets in early trials at Chandigarh and aims to cut the weight and thickness of imported transparent armour by 30 to 50 percent. If it succeeds, Indian armoured vehicles, helicopters and naval platforms will get lighter, faster and fully home-made protection.
What Is Bulletproof Glass and How Does It Work?
Bulletproof glass, more correctly called bullet-resistant glass or transparent armour, is a layered transparent material that slows and traps bullets instead of shattering. The DRDO project defines it as a hard glass face that flattens the bullet plus tough inner layers that absorb energy and hold fragments together.
The term bulletproof is a short name used in daily language. Experts prefer the name bullet-resistant glass or transparent armour because no glass is fully unbreakable. Every panel is rated to stop a fixed type of bullet, at a fixed speed, for a fixed number of hits. After repeated hits in the same spot, even the strongest panel can be broken.
A standard panel works in three steps. The outer layer is hard glass, usually soda lime silicate glass that has been strengthened by heating or chemical treatment. When a bullet hits, this hard face flattens the tip of the bullet and takes away its first speed. The middle layers are soft plastics such as polycarbonate (a tough transparent plastic) and polyvinyl butyral (PVB) or polyurethane (PU) (sticky films that glue the layers). These plastics stretch, spread the remaining energy over a wide area and catch the bullet and glass pieces. The inner layer on the safe side stops small glass chips, called spall, from flying inward and hurting the crew.
Conventional bulletproof glass for vehicles is made by stacking many glass sheets with plastic films and heating them together under pressure in a machine called an autoclave. The finished panel is thick and heavy, commonly between 19 mm and 89 mm in thickness and weighing between 80 and 180 kg per square metre for rifle level protection. That weight is the main problem the new Indian project wants to solve.
What Is the DRDO CSIR 50 Crore Project for Bulletproof Vehicles?
The DRDO CSIR bulletproof glass project is a ₹50 crore, four-year programme in which DRDO funds and guides research while CSIR-CGCRI develops the material as technology partner. The DRDO laboratories NMRL and TBRL support testing, and DRDO will later select an industry partner for large-scale factory production.
The Defence Research and Development Organisation (DRDO), the research arm of the Ministry of Defence, has taken CSIR-CGCRI as its technology partner for this work. The project is being executed inside DRDO laboratories and is already at an advanced stage. The plan was shared from Kolkata on 28 September 2026 by CSIR-CGCRI Director Bikramjit Basu (as of September 2026) and project leader Atiar Rahaman Molla of the Specialty Glass Division.
The core mandate is clear. The team must deliver indigenous advanced lightweight bulletproof glass for armoured vehicles that replaces imported transparent armour. The glass must give multi-shot protection, which means it must stop several bullets fired one after another in a small area without letting any bullet pass through. The target is to stop direct AK-47 rifle fire from 100 metres at the speed fixed in Indian test standards BIS V and BIS VI. BIS stands for Bureau of Indian Standards, the national body that sets quality and safety test methods in India.
Crucially, the new glass must be 30 to 50 percent lighter and thinner than the imported panels used today. The project will move step by step from laboratory samples to proof trials and then to a factory line run by an Indian company chosen by DRDO. Indian firms have already shown interest in taking the technology for commercial production.
How Is Bulletproof Glass Made?
CGCRI bulletproof glass is made of transparent glass ceramic in which tiny nanometre sized crystals are grown inside glass by controlled heating. The glass ceramic strike face is laminated with polyurethane glue and a polycarbonate backing, then bonded by heat and pressure to form thin and light armour.
The material is called glass ceramic. It starts as a normal precursor glass mix. Scientists then heat it in a controlled way, a step called controlled crystallisation. In this step, very small crystals, only 20 to 30 nanometres wide, grow evenly inside the glass. A nanometre is one billionth of a metre, far smaller than a dust particle. These crystals make the glass much harder and tougher but still let light pass, so the panel stays clear.
CGCRI is working mainly on two families called MAS and LAS glass ceramics. MAS stands for magnesium aluminosilicate and LAS stands for lithium aluminosilicate, which are names of the chemical mixes used. Laboratory data show these panels allow about 80 to 88 percent light through a 2 mm sheet, reach a bending strength above 400 MPa (megapascal, a unit of strength) and a hardness near 8.9 GPa (gigapascal), which is almost double that of normal window glass. Their fracture toughness, which measures resistance to cracking, is about 3.6 MPa root metre, nearly five times higher than normal glass.
After the glass ceramic is ready, it is cut to size, cleaned in a dust free room and stacked with a polyurethane bond layer and a polycarbonate backing layer. The stack is sealed under vacuum to remove air and then heated under pressure in an autoclave. The heat melts the glue films and joins all layers into one solid block. Edge sealing and coating are added to stop moisture entry.
Thickness and protection level go together. A thicker panel with more layers stops bigger bullets, but it also adds weight. The table below explains the idea in simple form.
| Protection Idea | What It Stops | Typical Thickness | What It Means for Vehicles |
|---|---|---|---|
| Lower level, handgun protection | 9 mm pistol or .357 Magnum, 3 shots | About 30 to 43 mm | Lighter, used for cars and guard posts |
| Rifle level, BIS V and VI target | 7.62 mm AK-47 round, multi-shot from 100 metres | Conventionally 60 to 80 mm, new aim below 50 mm | Needed for armoured vehicles in combat zones |
| Highest level, armour piercing | 7.62 mm hard core or 12.7 mm heavy machine gun, single shot | 80 to 90 mm or special ceramics | Very heavy, used only for tanks and bunkers |
In the first trial at the DRDO Terminal Ballistics Research Laboratory (TBRL) in Chandigarh, the CGCRI panel stopped a round fired from a Trichy Assault Rifle (TAR), an Indian rifle similar to the AK-47, from 10 metres at about 695 metres per second. The next step is multi-shot testing, where several rounds are fired quickly into the same panel to check real battle performance.
Which Institutions Are Leading the Project?
The Central Glass and Ceramic Research Institute is located at 196 Raja S C Mullick Road, Jadavpur, Kolkata in West Bengal. The CSIR-CGCRI functions under the Council of Scientific and Industrial Research and leads specialty glass research with centres at Khurja in Uttar Pradesh and Naroda in Gujarat.
The full form of CGCRI is Central Glass and Ceramic Research Institute. It is a national laboratory under the Council of Scientific and Industrial Research (CSIR). CSIR is the largest public research network in India for industry oriented science. CGCRI started work in a limited way in 1944 and was formally opened on 26 August 1950 at Kolkata. Kolkata was chosen because West Bengal was a major centre of glass and ceramic industry with nearby mines, coal fields and skilled workers. CGCRI is the only public institution in India fully devoted to glass, ceramics and allied materials.
Inside CGCRI, the Specialty Glass Division leads this project. This division builds special glasses for strategic needs such as space grade optical glass, laser glass, radiation shielding windows for nuclear hot cells and now transparent glass ceramics for armour. Project leader Atiar Rahaman Molla, Scientist-F in this division, guides the material design and panel fabrication.
The funder and user guide is DRDO, which stands for Defence Research and Development Organisation. DRDO was formed in 1958 by joining defence science units and is headquartered in New Delhi. It runs a network of about 41 laboratories for aeronautics, missiles, electronics, armaments and materials. Two DRDO laboratories are directly tied to this glass project, as shown below.
| Laboratory | Location and Year | Role in This Project |
|---|---|---|
| Naval Materials Research Laboratory (NMRL) | Ambernath, Thane district, Maharashtra, set up in 1953 | Gives advice on materials for naval and defence use and works with CGCRI on making the glass stronger and lighter |
| Terminal Ballistics Research Laboratory (TBRL) | Chandigarh, became fully active in 1968, with a 5,000 acre firing range at Ramgarh in Haryana | Tests armour against bullets, blasts and fragments and hosts the live firing trials of the new panels |
TBRL evaluates body armour, vehicle armour and helmets against small arms. NMRL is the single window agency for materials needed by the Indian Navy. Together with CGCRI, they form a laboratory to trial chain that keeps the know-how inside the country.
Why Lightweight Transparent Armour Matters for Armoured Vehicles
Armoured vehicles of the Indian Army and paramilitary forces need windows that protect the crew without slowing the vehicle. The DRDO CGCRI glass aims to solve this exact trade between safety and mobility by cutting panel weight and thickness by nearly half while keeping multi-shot rifle protection.
A conventional armoured vehicle uses thick multi-layer glass for its windscreen and side windows. Each square metre can weigh more than 160 kg. That extra load reduces speed, raises fuel use, cuts the distance a vehicle can travel and leaves less capacity for troops, weapons and rescue tools. Heavy glass also needs stronger frames and hinges, which add even more weight. A 30 to 50 percent cut in areal density, which is weight per unit area, directly improves acceleration, turning and payload capacity. Computer studies at CSIR-Structural Engineering Research Centre using AUTODYN and ABAQUS software suggest about 37 percent weight saving is possible when MAS glass ceramic replaces normal glass with a polyurethane and polycarbonate backing.
The Indian fleet that will benefit is large. The Indian Army operates tanks such as Arjun built by the Combat Vehicles Research and Development Establishment (CVRDE) at Avadi, infantry carriers, mine protected vehicles and the Wheeled Armoured Platform (WhAP) 8x8. The Vehicle Research and Development Establishment (VRDE) at Ahmednagar has already supplied 229 custom bulletproof vehicles based on light commercial vehicles to state police and paramilitary forces for counter terrorist work and VIP security. The Central Reserve Police Force (CRPF) and state police use such vehicles in forests, cities and border roads where rifle fire is a real risk.
The new material has uses beyond trucks and cars. Because it is light and clear, the same glass ceramic can protect helicopter windscreens, naval ship bridges, coastal patrol craft and aircraft windows where every kilogram counts. It can also guard police stations, critical offices, banks and power control rooms. By replacing imported transparent armour with home-made panels, India will save foreign exchange, secure supply during crises and build skill in advanced materials, a core aim of indigenous defence production.
What Will Bulletproof Glass Cost and What Happens Next?
Bulletproof glass cost in India depends on thickness, level and size, with vehicle panels costing far more than home panels due to rifle rating. The DRDO CGCRI project does not fix a price but aims to lower cost by making glass ceramic in Indian factories instead of importing foreign panels.
Yes, bulletproof glass is expensive compared with normal glass. The price rises with each extra layer, with higher rifle protection and with larger curved shapes for vehicles. A small home window panel with low level handgun protection costs far less than a large windscreen that must stop multiple AK-47 rounds and still stay clear for driving. For cars, the glass is only one part of the bill. Labour for fitting, stronger frames, suspension changes and testing add to the final bulletproof car price in India, which is why civilian armoured cars cost many times more than the base model.
In India, bulletproof glass is legal to make, sell and use. Security forces, government fleets, banks and critical offices use it routinely. Private citizens can fit it on vehicles through authorised firms by following transport and police rules for vehicle modification and tint limits. The law focuses on safe use and clear vision, not on banning the material itself.
| Cost Factor | Why It Raises Price | How the New Project Helps |
|---|---|---|
| Imported glass and films | Foreign exchange, shipping and duty add cost | Home-made glass ceramic cuts import need |
| Thickness and weight | More layers mean more material and fuel cost | 30 to 50 percent thinner panels use less material |
| Size and shape | Large curved windscreens need special moulds | Glass ceramics can be made in large sizes and complex shapes at reasonable cost |
| Testing and certification | Each design must pass live firing and optical tests | In-house TBRL trials and BIS standards keep testing inside India |
The road ahead has three clear steps. First, CGCRI and TBRL will complete multi-shot testing with AK-47 type rounds at 100 metres under BIS V and VI methods. Second, DRDO will select an industry partner to scale the process from laboratory sheets to factory output. Letters of interest have already come from Indian glass firms for joint development and transfer of technology. Third, the panels will be fitted on trial vehicles for mobility, visibility and durability checks in heat, dust and vibration before bulk orders for the Army, police and other users.
Key Takeaways
- The DRDO CSIR-CGCRI ₹50 crore four-year project for indigenous lightweight bulletproof glass was reported on 28 September 2026 from Kolkata.
- The project targets 30 to 50 percent cut in weight and thickness over imported transparent armour while stopping AK-47 fire from 100 metres under BIS V and BIS VI standards.
- Early trials at DRDO-TBRL Chandigarh stopped a Trichy Assault Rifle round from 10 metres at about 695 metres per second, with multi-shot tests planned next.
- The panels use transparent MAS and LAS glass ceramics with 20 to 30 nanometre crystals that give bending strength above 400 MPa and clarity of 80 to 88 percent.
- CSIR-CGCRI, established in 1950 at Jadavpur, Kolkata, is the technology partner, supported by NMRL Ambernath and TBRL Chandigarh.
- DRDO, formed in 1958 and headquartered in New Delhi, will select an industry partner to move the technology from laboratory to large-scale manufacturing.
