SankalpIndia has its own published geometry for glass bottle necks: IS 7511, Dimensions for Neck Finishes, issued by the Bureau of Indian Standards under the Glassware sectional committee CHD 10 in eight parts. Part 4 matters for aluminium roll-on closures: it specifies roll-on threads pilferproof finishes in four depths, across nominal sizes from 22 mm to 70 mm. Product standards call it up, so IS 1662 for glass liquor bottles and IS 11984 for free flowing liquids both point back to it.
Key takeaways
- IS 7511 (Part 4) covers roll-on threads pilferproof, abbreviated ROSPP, in standard, shallow, deep and extra deep types.
- IS 1662 sets the pilfer-proof finish diameter for glass liquor bottles by capacity, and points to Part 4 for dimensions.
- IS 11984 requires glass bottles for free flowing liquids to carry a 28 mm or 31.5 mm ROPP standard neck finish conforming to Part 4.
- Pharmaceutical glass containers are covered by IS 1108, with the finish still taken from IS 7511.
- There is no published Indian Standard for the aluminium closure itself. The standards define the bottle; the cap is matched to it.
The IS 7511 series
IS 7511 began as a summary sheet on glass container neck finishes and was retitled once it was clear the document was mainly geometry. It is issued in parts, one per finish family.
| Part | Finish family |
|---|---|
| Part 1 | Shallow continuous thread finish (R 3) |
| Part 2 | Shallow continuous thread finish for deep screw caps (R 3/D) |
| Part 3 | Roll-on threads non-pilferproof (RONPP) |
| Part 4 | Roll-on threads pilferproof (ROSPP) |
| Part 5 | Vial goldie seal glass finishes |
| Part 6 | Dual neck finish |
| Part 7 | Crown finish |
| Part 8 | Vacuum lug finish |
Parts 3 and 4 are the roll-on pair. Part 3 is for a roll-on closure with no tamper band; Part 4 also carries the locking ring a pilfer band tucks under. Anything sold in India as a pilfer-proof cap runs on a Part 4 finish or its equivalent.
What IS 7511 (Part 4) actually specifies
Part 4 defines four types, and the type changes the height of the neck rather than its diameter. Table 1 gives the tolerance band on every dimension letter, with helix angle, cutter diameter and pitch.
| Finish type | Nominal sizes covered | Thread pitch |
|---|---|---|
| Standard finish | 22, 25 | 3,17 mm |
| Standard finish | 28, 31.5, 53 | 3,63 mm |
| Standard finish | 70 | 4,23 mm |
| Shallow finish | 38, 46 | 3,17 mm |
| Deep finish | 31.5 | 3,63 mm |
| Extra deep finish | 30 | 3,17 mm |
Two clauses are worth quoting to a glass supplier. The sealing surface must remain flat to a minimum of 0,9 mm as well as meeting the tabulated dimensions, and be as regular and smooth as possible. Essential dimensions may be checked by an appropriate method of measurement or with suitable gauges. Amendment No. 1 of October 1987 corrects one cell of Table 1, so ask for the amended copy. The depth classes say that the same diameter can carry a short neck or a tall one, and the closure skirt has to follow; the ROPP cap size chart lists what is in circulation.
The liquor bottle case: IS 1662
IS 1662, Specification for Glass Liquor Bottles, is the clearest case of an Indian product standard reaching into finish geometry. It rationalised liquor bottles to five capacities and fixed the pilfer-proof finish diameter for each.
| Nominal capacity | Nominal finish diameter |
|---|---|
| 750 ml | 28,0 mm |
| 500 ml | 28,0 mm |
| 375 ml | 28,0 mm |
| 250 ml | 25,0 mm |
| 180 ml | 25,0 mm |
Two agreed departures follow. The 250 ml and 180 ml bottles may take a 28,0 mm finish by agreement, and for Indian made foreign liquor the 750 ml bottle may take a 31,5 mm standard or deep finish, or a 30,0 mm extra deep finish. Read that against the Part 4 table and it lines up: 31.5 mm exists in both standard and deep, 30 mm only as extra deep. The tall skirts on Indian spirits are that clause in physical form; liquor bottle caps in India covers the segment. IS 1662 also grades the glass, requiring Type 4 under the alkalinity clause when graded by IS 2303, with a thermal shock test to IS 6506.
How Indian designations map to the international ones
Indian glass plants quote IS numbers, bottlers often receive drawings quoting European ones, and closure suppliers work to whichever arrives. The systems are parallel, not identical, so this is for orientation only.
| Indian reference | International counterpart |
|---|---|
| IS 7511 (Part 4) roll-on threads pilferproof | ISO 9056, series of pilferproof finish, dimensions |
| IS 7511 (Part 1) shallow continuous thread | BS 1918 Part 1, continuous thread finish |
| IS 7511 (Part 7) crown finish | ISO 8162 and ISO 8163; BS 1918 Part 2 |
| 28 mm roll-on pilferproof finish | The MCA family, published by CETIE as GME data sheets |
That mapping is not a guess. IS 7511 (Part 4) states in its explanatory note that assistance was derived from ISO 8162-1985, ISO 8163-1985, ISO/DP 9100, BS 1918 Part 1 of 1978 and BS 1918 Part 2 of 1981.
What no Indian standard covers is the closure. There is no published IS specification for an aluminium roll-on cap the way there is for the bottle, which is why buyers work from the bottle drawing and a sample. Neck finish codes and cap sizes explains the codes, and 28mm ROPP caps covers the dominant Indian diameter.
Frequently asked questions
Which Indian Standard covers glass bottle neck finishes?
IS 7511, Dimensions for Neck Finishes, published by the Bureau of Indian Standards under the Glassware sectional committee. It runs to eight parts, one per finish family: shallow continuous thread, roll-on non-pilferproof, roll-on pilferproof, vial goldie seal, dual neck, crown and vacuum lug.
What does IS 7511 Part 4 specify?
Dimensions for roll-on threads pilferproof finishes, abbreviated ROSPP, in four types: standard, shallow, deep and extra deep. Its table covers nominal sizes 22, 25, 28, 30, 31.5, 38, 46, 53 and 70 mm with tolerances, helix angle, cutter diameter and pitch, and requires the sealing surface to stay flat to a minimum of 0,9 mm.
What neck finish do Indian liquor bottles use?
IS 1662 specifies a pilfer-proof finish of 28,0 mm nominal diameter for 750 ml, 500 ml and 375 ml bottles, and 25,0 mm for 250 ml and 180 ml. For Indian made foreign liquor the 750 ml bottle may instead take a 31,5 mm standard or deep finish, or a 30,0 mm extra deep finish.
Is there an Indian Standard for the aluminium cap itself?
Not in the way there is for the bottle. Indian standards define the container and its finish geometry, and the roll-on closure is matched to it. Because the cap’s thread is formed during capping, the finish drawing is the controlling document.
How do IS finishes relate to MCA codes?
They are parallel systems covering the same job. IS 7511 Part 4 corresponds to the ISO pilferproof finish series, and the 28 mm roll-on finishes correspond to the European MCA finishes CETIE publishes as GME sheets. Similar geometry is not interchangeable geometry.
Sources
- BIS, IS 7511 (Part 1): 1992, Dimensions for Neck Finishes, for the series title, committee and parts.
- BIS, IS 7511 (Part 4): 1986, Roll-on Threads Pilferproof, for finish types, sizes, pitches, the sealing surface clause and documents consulted.
- BIS, IS 1662: 1974, Glass Liquor Bottles, for finish diameters by capacity and the IMFL clause.
- BIS, IS 11984: 1986, Glass Bottles for Free Flowing Liquids, for the ROPP finish requirement.
- BIS, IS 1108: 1975, Pharmaceutical Glass Containers.
- ISO, ISO 9056:1990, series of pilferproof finish.
- CETIE, Finish data sheets (GME), for the MCA sheets.
R Vision Pvt. Ltd manufactures 28/15 mm aluminium ROPP closures from Sinnar, Nashik. Send the drawing your bottle was made to through contact us.