Most bottle defects start in the preform, from wet resin, wrong intrinsic viscosity, stress marks or an off-centre gate. Preform makers searching for preforms testing instruments manufacturers in India will find a set covering resin through finished neck, and our suppliers in India service dispatches to injection moulding plants and bottler quality labs.
The range covers resin, process and finished preform. Resin checks use the halogen moisture analyser, the intrinsic viscosity system and the density gradient column for crystallinity. Process outputs are examined by the headspace gas chromatograph for acetaldehyde and the spectrophotometer for colour and haze.
Geometry and stress are measured on the ultrasonic wall thickness gauge, the gate concentricity and wall eccentricity tester, the neck finish gauge set and the polariscope stress viewer. Finally, the laboratory stretch blow moulding machine turns sample preforms into bottles to prove blowability without occupying a production line. A new preform plant usually builds the lab in this resin, geometry, blowing order.
Last updated: November 2026
Benchtop transmission spectrophotometer that reports CIE L*a*b* colour and percent haze of clear PET preforms and moulded step plaques. Used by resin and preform producers to hold colour and clarity specifications for water and beverage bottles.
Glass density gradient column that determines the density and percent crystallinity of PET preform neck and gate areas. Used by preform producers to ensure the neck finish crystallisation is within spec and the body is amorphous.
Halogen heating moisture analyser that dries PET resin or preforms and reports weight loss as percent moisture. Used by preform plants to check dryer outlet material before injection moulding, avoiding IV loss and hydrolysis.
Gas chromatograph with automatic headspace sampler and cryogenic grinder for measuring free acetaldehyde in PET preforms and bottle resin. Used by beverage and water bottle suppliers to control taste-affecting AA levels in ppm.
Automatic capillary viscometer with thermostatic bath that measures the intrinsic viscosity of PET chips and preforms in solvent. Used by resin producers and preform makers to monitor polymer degradation during moulding per ASTM D4603.
Bench-top stretch blow moulding machine with an infrared heating oven that blows trial bottles from preforms to evaluate processability. Used by preform developers and bottle makers to test new resin grades and preform designs before production.
Cross-polarised light viewer that reveals residual injection moulding stress in PET preforms as coloured fringe patterns. Used by preform moulders and bottle blowers to detect stress that causes base cracking, hazy bottles and uneven blowing.
Rotating-fixture instrument with dial probes that measures body wall offset and gate-to-neck concentricity in PET preforms. Used by moulders to detect core shift that produces uneven bottle walls and weak bases.
Set of go/no-go and dial gauges for checking neck diameter, thread height, support ledge and tamper band of PET preforms. Used in injection moulding QC to ensure caps fit and bottles seal correctly on the filling line.
Handheld ultrasonic thickness gauge with a high-frequency probe for measuring preform sidewall and base thickness without cutting. Used by preform and bottle makers to verify uniform wall distribution and to set injection parameters.
| Function | Products | What to confirm |
|---|---|---|
| Resin and crystallinity | Halogen Moisture Analyser for PET Chips and Preform Resin, Intrinsic Viscosity Measuring System for PET Resin and Preforms, Density Gradient Column for Preform Crystallinity Testing | Moisture analyser temperature range and readability, viscometer bath control and solvent handling, column density range and float set. |
| Process quality | Headspace Gas Chromatograph for Preform Acetaldehyde Analysis, Colour and Haze Spectrophotometer for Preform Plaques and Preforms, Polariscope Stress Viewer for PET Preforms | GC detector and headspace sampler type, gas supply, spectrophotometer geometry and sample holders, polariscope viewing area. |
| Dimensions and geometry | Ultrasonic Wall Thickness Gauge for PET Preforms, Preform Gate Concentricity and Wall Eccentricity Tester, Preform Neck Finish and Thread Dimension Gauge Set | Probe frequency and measuring range, rotating fixture size, gauge set neck standards covered, resolution of dial probes. |
| Blowability trials | Laboratory Stretch Blow Moulding Machine for Preform Evaluation | Maximum bottle volume, preform size range, heating zones, air pressure supply and mould changeover time. |
Preform instruments sit upstream: they check PET resin quality, acetaldehyde, preform stress and neck dimensions before the preform is reheated and blown. Blow Molding Testing Instruments serve the finished container or the blowing process, measuring wall distribution and performance of the bottle. A bottler who makes its own preforms needs both, while an injection moulder selling preforms mainly buys from this range.
See also: Blow Molding Testing Instruments
The complete Preforms Testing Instruments range (10 products), in alphabetical order:
Confirm the capillary type and bath temperature control, usually 25 deg C, the solvent your method specifies and the handling of fumes. Automatic systems dissolve and measure with minimal operator input, but need a ventilated space. Check the viscometer calibration with a reference, and agree the calculation method for IV from relative viscosity.
PET preform walls are 2 to 4 mm thick, so a high-frequency ultrasonic probe with fine resolution is suitable. Check the measuring range, couplant needs, velocity setting for PET, probe size on curved surfaces and whether the gauge stores readings. Magnetic or ultrasonic options exist, and bench fixtures help in repeatable measurement.
Match the machine to your preform neck finish and weight range, and to the largest bottle volume you want to trial. Check the oven zones, stretch rod control, pre-blow and high-pressure air settings and the air compressor requirement. Also verify mould changeover time, since labs trial many designs.
PET preform injection moulders, bottle blowers who produce their own preforms, beverage and edible oil bottlers, PET resin producers and recyclers, mould and machine makers, and packaging test labs are the main buyers. A preform plant usually buys the moisture analyser, polariscope and neck gauges first, adding IV, acetaldehyde and blowing trials when it starts to supply large beverage customers.
Yes. We supply to PET plants across India and to overseas customers. Provide your preform weights, neck standards and voltage, and we will respond with a quotation and packing details.
Acetaldehyde forms when PET degrades during melting and can give a sweet taste to water or beverages. Headspace gas chromatography measures the amount released from ground preforms, so processors can correct melt temperature and residence time.
Crossed polarisers reveal coloured fringes where residual stress is trapped from injection moulding, particularly near the gate and under the neck. High stress leads to cracks or poor blowing, so operators use it to adjust moulding settings.
A GC needs carrier and detector gases, stable power and a clean laboratory space. We specify the requirements and can organise commissioning and method training on request.
Yes. Neck gauge sets are chosen by finish type, for example 28 mm or 38 mm, and they can be supplied for several finishes. Please provide drawings or standards.
Civil Mechanical India is an established manufacturer and supplier for tender requirements from India, handling civil laboratory and industrial testing tenders and bulk and OEM orders for mechanical engineering and testing laboratory equipment. On receipt of your tender specifications, we will submit a complete quotation for Preforms Testing Instruments.
Send us your equipment list or tender specification. We quote against IS, BS, EN, ASTM and AASHTO standards and ship to 90+ countries.
