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An Indian plastic injection moulding supplier produces auto interior, bumper, under-hood and connector components from four resin families (ABS, PP/TPO, PA66+GF, PC/ABS) on a mix of OEM-owned moulds (capitalised on OEM books, held at supplier premises) and supplier-owned moulds (capitalised on supplier books under Ind AS 16). Reconciliation must close cycle-time piece-rate conversion billing against contracted machine-rate per hour and contracted cycle time per mould, run index-linked RMPV claims on virgin resin consumption with regrind blending discipline, post mould-cycle amortisation on supplier-owned moulds, raise periodic tooling-maintenance back-charges and approved refurbishment invoices on OEM-owned moulds, and apply 18 percent GST on the conversion service under HSN 9988 plus resin GST per chapter heading.
Maintain per-mould master with ownership flag (OEM versus supplier), contracted cycle time, machine-rate per hour, regrind-blend percentage per part, mould-cycle counter and expected mould-cycle life. Per shift per mould, log machine cycles, dispatched piece count, resin consumed (virgin and regrind), and actual cycle-time. Close the resin-to-piece identity per shift; flag actual-versus-contracted cycle drift; run RMPV claim on virgin resin equivalent against the contracted index reference. On supplier-owned moulds, post Ind AS 16 amortisation per cycle. On OEM-owned moulds, run the tooling-maintenance back-charge cadence and surface refurbishment triggers. Bill the conversion invoice at piece-rate × dispatched piece count with 18 percent GST under HSN 9988.
Per-mould master with ownership flag, cycle-time spec, machine-rate, regrind-blend percentage per part, cycle-counter and life expectancy; resin-family master with index reference (crude / butadiene / styrene / caprolactam / bisphenol A) per family; per-machine master with tonnage class and machine-rate matrix; OEM-owned mould stewardship register with tooling-maintenance back-charge cadence; refurbishment-trigger master per mould-cycle threshold; RMPV index master with monthly publication dates and contractual reference.
A monthly moulding reconciliation statement closing resin-to-piece identity per mould per shift; cycle-time drift dashboard flagging contracted-versus-actual variance per mould; RMPV claim register per resin family with virgin-equivalent computation and regrind credit; supplier-owned mould amortisation per Ind AS 16 with cycle-counter trigger; OEM-owned mould tooling-maintenance back-charge register and refurbishment-trigger queue; conversion invoice register with HSN 9988 at 18 percent GST and dispatched-piece-count audit trail.
An instrument-panel Tier-1 in the Chennai Sriperumbudur belt produces dashboard substrates, glove-box internals, A/C vent bezels and door-trim clips for Hyundai India and Hyundai-Kia. The shop floor runs fourteen injection-moulding machines spanning 250-tonne (small clip moulds) up to 2,200-tonne (instrument-panel substrate). All fourteen moulds for the OEM programs are OEM-owned — capitalised on Hyundai’s books, held at the supplier’s premises under tooling-stewardship agreements, maintained by the supplier on contracted preventive-maintenance plans, with periodic tooling-maintenance back-charges and approved refurbishment invoices. The resin is supplier-owned — supplier procures from BASF India, LG Chem India, SABIC and Reliance, holds it on the supplier’s purchase ledger and inventory, and runs an index-linked RMPV claim against Hyundai per the contract. By the end of the month, the reconciliation must close resin-to-piece identity per mould per shift across fourteen moulds, raise the RMPV claim per resin family against the contracted index, post Ind AS 16 amortisation on three supplier-owned secondary moulds, raise quarterly tooling-maintenance back-charges on the fourteen OEM-owned moulds, and queue two refurbishment triggers for OEM approval. This is plastic injection moulding reconciliation auto component India — split ownership across resin, mould and the cost stack that ties them together.
Quick reference
| Concept | Treatment | Regulator / standard | Tax leg |
|---|---|---|---|
| OEM-owned mould | Capitalised on OEM books | Ind AS 16 (OEM-side) | Memo asset at supplier |
| Supplier-owned mould | Capitalised on supplier books | Ind AS 16 | Amortised over cycle life |
| Tooling-maintenance back-charge | Periodic recovery on OEM-owned mould | Tooling agreement | GST per HSN, raised as supply |
| Supplier-owned resin | On supplier purchase ledger | Indian GAAP / Ind AS 2 | GST per resin chapter heading |
| Cycle-time piece-rate billing | Contracted per-piece rate | Commercial / ACMA | 18% GST under HSN 9988 |
| RMPV on virgin resin | Index-linked claim | OEM-supplier contract | Pass-through, separate invoice |
| Regrind blending | Contracted blend percentage | OEM quality engineering | Reduces virgin consumption |
| Sprue + runner residue | 10-30% of shot weight, recycled in-house | Internal | Not a sale, no tax |
The four resin families
Auto plastic injection moulding is dominated by four resin families with distinctly different cost profiles, index references and reconciliation behaviours:
- ABS (acrylonitrile butadiene styrene) — instrument-panel substrate, glove-box internals, console parts. High stiffness, good paint adhesion, moderate cost. Indexed to butadiene and styrene feedstock. Net auto-grade pricing is typically a 15-25% premium over the underlying monomer index.
- PP and TPO (polypropylene blends including thermoplastic olefin and glass-filled PP-GF) — bumpers, fender liners, wheel-arch shields, under-body trim. Low cost, low density, good impact at low temperature, indexed to crude-derived propylene. Typically the highest-tonnage resin family on an auto plastics shop floor.
- PA66+GF (polyamide 66 with glass fibre) — intake manifolds, structural under-hood brackets, electrical-connector housings. High-temperature performance, high cost, indexed to caprolactam (an intermediate from benzene and ammonia). Auto-grade PA66+GF can be 2-3x the cost per kilogram of PP-GF.
- PC/ABS (polycarbonate-ABS blend) — interior bezels, instrument-cluster lenses, dashboard surrounds where aesthetic and impact are both required. Premium price, indexed to bisphenol A and ABS.
The supplier’s RMPV claim master must hold each family on its own index reference because they move independently on global feedstock cycles. A spike in caprolactam can leave PA66+GF prices 30% higher year-on-year while PP holds flat on a slack propylene market — claiming PA66+GF RMPV against a crude-only index gives the wrong number in both directions. The RMPV contractual mechanics across auto are covered in RMPV clause in auto component contracts and the formula in RMPV calculation formula.
OEM-owned moulds: capitalisation, stewardship and back-charges
Indian auto OEMs typically capitalise high-value injection moulds as their own balance-sheet assets under Ind AS 16. The mould is physically held at the supplier’s premises under a tooling-stewardship agreement that sets out:
- Title and ownership — the OEM owns the mould; the supplier is a custodian.
- Maintenance obligation — daily cleaning, weekly inspection, scheduled preventive maintenance, mid-life refurbishment.
- Recovery mechanism — a tooling-maintenance back-charge raised periodically on the OEM, typically per-thousand-cycle or as a flat quarterly / half-yearly recovery.
- Refurbishment approval — major events (cavity polishing, sliders rebuild, runner-block replacement, hot-runner heater renewal) are pre-approved on photographs, replaced-part documentation and engineering sign-off, then billed separately.
- Mould transfer — on program end or program transfer, the mould is returned to the OEM or to the OEM’s nominated alternative supplier on a Rule 55 delivery challan.
On the supplier’s books, the mould is memorandum-only — described as held on behalf of OEM, no inventory or fixed-asset entry. Mould-cycle counters are still maintained by the supplier on the OEM’s behalf because the refurbishment plan depends on cycle accumulation, but no depreciation flows through the supplier’s P&L on these moulds.
The tooling-maintenance back-charge is a positive supply by the supplier to the OEM and carries appropriate GST (typically 18% as a service under HSN 9988 maintenance services, or under the relevant tooling-services HSN per the agreement). The back-charge appears on the supplier’s revenue ledger; the OEM may set it off against the supplier’s conversion-charge payable, or pay it as a standalone invoice. The reconciliation must keep the back-charge stream and the conversion-charge stream separate even when settlement is netted.
Supplier-owned moulds: Ind AS 16 amortisation on cycle life
Where the supplier owns the mould (smaller programs, supplier-developed parts, secondary tooling), full Ind AS 16 treatment applies on the supplier’s books. The mould is capitalised at procurement cost (including design, fabrication, trial, transport, installation) and depreciated over its expected mould-cycle life, not on calendar months, because consumption is cycle-driven.
Typical mould-cycle life by resin family:
| Resin | Typical mould-cycle life |
|---|---|
| ABS, PP, PP-GF | 1.5 to 3 million cycles before major rebuild |
| PA66+GF, PA6+GF | 500,000 to 1.5 million cycles (glass abrasion shortens life) |
| PC/ABS | 1 to 2 million cycles |
| Glass-mineral-filled engineering grades | 300,000 to 800,000 cycles |
Depreciation per cycle = mould capital cost ÷ expected cycle life. Cumulative depreciation flows into the conversion-rate build-up. The mould-cycle counter (a hardware counter on the press or in the moulding-MES) drives both depreciation and refurbishment-trigger alerts. The mould-amortisation discipline is covered in detail in tooling cost recovery and amortisation in auto components.
Cycle-time piece-rate billing
Cycle-time piece-rate is the standard conversion-billing model in Indian auto plastics. The contracted cycle time (machine seconds per piece for a multi-cavity mould this is per shot, divided by cavity count for per-piece) is multiplied by the machine-rate per hour (which factors machine tonnage, energy, depreciation, labour, overhead) to give a per-piece machine cost. Add the contracted material cost per piece (resin × shot weight ÷ cavity count) and a contracted overhead recovery, and that is the piece-rate.
Cycle time creeps. Typical drivers:
- Mould wear — gates erode, ejection pins drag, sliders bind, cooling channels foul. Cycle time creeps 2-8% over the mould’s mid-life.
- Resin lot variation — supplier-to-supplier or lot-to-lot melt-flow index variance can shift cycle by 1-3%.
- Machine ageing — hydraulic pump efficiency drops, clamp force builds slowly, mould-open speed reduces.
- Operator and changeover discipline — set-up time, dry-cycle losses.
The reconciliation must compare contracted cycle time versus actual cycle time per mould per shift, surface drift before the next pricing renegotiation, and feed the cycle-time data into the OEM’s program review. Without it, the supplier accepts a contracted piece-rate based on stale cycle assumptions and absorbs the drift as margin erosion.
Three-way match exception calculator for moulding
See how the resin GRN, conversion invoice and tooling back-charge tie together — and where cycle-time drift and regrind miscalculation hide.
Open the three-way match exception calculator →Sprue, runner and regrind accounting
Every injection-moulded shot produces a sprue (the channel from the nozzle to the cold-runner manifold) and runners (the channels feeding each cavity). On a cold-runner mould the sprue and runner solidify with the part and are mechanically separated at de-moulding. On a hot-runner mould the runner stays molten — sprue waste is minimal. For cold-runner moulds the sprue-and-runner residue runs typically:
- 10-15% of shot weight on a large single-cavity instrument-panel mould.
- 15-25% on a typical four- or eight-cavity interior-clip mould.
- 25-35% on a high-cavity-count micro-mould (small connectors, badges).
The standard treatment is in-house regrind:
- The sprue and runner residue drops into a granulator beside the moulding machine.
- Granulated material is blended with virgin resin at a contracted blend percentage (typically 10-30%) per part per OEM.
- The blended feed re-enters the same part.
- The OEM’s quality engineering signs off the regrind-blend percentage on property-impact testing.
For RMPV claims, the reconciliation must compute virgin resin equivalent consumption per part — actual resin pulled from the silo, minus the regrind credit that came from in-process recovery. Regrind reduces virgin consumption per piece and flows as a direct cost saving, which the contracted RMPV calculation must net out to avoid over-claiming.
Some applications (safety-critical structural, optical-clarity parts) do not permit in-house regrind. Sprue-and-runner residue from these moulds is sold externally as scrap to a polymer-recycler — at which point Section 394 TCS code 1071 at 1% of sale value applies to the supplier as the legal seller. The scrap-disposition framework mirrors the metal-scrap rail in Section 394 TCS scrap sale.
Worked example — Hyundai India instrument-panel Tier-1, 14 OEM-owned moulds
The Sriperumbudur Tier-1 introduced at the top runs the following monthly profile for Hyundai India:
- 14 OEM-owned moulds: 4 instrument-panel substrate (1,800-T and 2,200-T machines), 6 interior-bezel and trim (800-T and 1,300-T machines), 4 small-clip multi-cavity (250-T and 400-T machines).
- 3 supplier-owned secondary moulds: small functional clips not on Hyundai’s tooling list, supplier-developed and depreciated under Ind AS 16.
- Resin consumption: 48 MT of ABS, 22 MT of PP-GF, 8 MT of PA66+GF, 4 MT of PC/ABS — 82 MT total, supplier-owned, on supplier purchase ledger.
- Contracted regrind blend: 20% on ABS instrument-panel substrate, 15% on PP-GF interior, 0% on PA66+GF connector (no regrind permitted), 10% on PC/ABS bezel.
- Mould-cycle counters: instrument-panel mould IP-01 at 1.85 million cycles of 2.5 million life (refurbishment trigger imminent at 2.0 million).
Conversion invoice build
Total dispatched pieces for the month: 1.42 million across the fourteen moulds. The conversion invoice runs at cycle-time piece-rate per mould — averaging ₹12.40 per piece on the high-cavity small-clip moulds, ₹38.50 per piece on the bezel moulds, ₹148.00 per piece on the instrument-panel substrate. Total conversion charge approximately ₹1.96 crore, plus 18% GST under HSN 9988 = ₹2.31 crore gross invoice.
Tooling-maintenance back-charges
Quarterly tooling-maintenance back-charge on the fourteen OEM-owned moulds, raised in June for Q1 FY 2026-27 (April-June): aggregated cycles run × contracted maintenance recovery rate per thousand cycles, total ₹14.2 lakh, plus 18% GST = ₹16.76 lakh gross.
Refurbishment triggers
Mould IP-01 (instrument-panel substrate) hit the 1.85 million cycle threshold mid-month. Engineering inspection flagged gate-erosion on cavity #2 and slider-pin wear. Refurbishment estimate ₹8.4 lakh approved by the Hyundai tooling team on photo-and-replacement-part documentation; refurbishment scheduled for the August plant shutdown; back-charge raised on OEM approval in July with full Ind AS 18 / 115 revenue recognition.
RMPV claim
ABS claim against the contracted styrene-butadiene index reference, on virgin-equivalent consumption of 38.4 MT (48 MT total minus 9.6 MT regrind credit at 20% blend). Index moved +6.8% over the contracted reference period, supplier landed cost moved +5.2%, contracted RMPV pass-through band ±2%. RMPV claim raised on the 3.2% in-claim differential × 38.4 MT × contracted reference price per MT, approximately ₹4.1 lakh. PP-GF and PC/ABS claims processed against their respective indices. PA66+GF (no regrind) processed against caprolactam index — a separate ₹2.3 lakh claim.
Supplier-owned mould amortisation
The three supplier-owned secondary moulds: mould-cycle counters logged 184,000 cycles aggregated for the month, depreciation at ₹2.20 per cycle on average expected cycle life of 1.2 million, total Ind AS 16 amortisation ₹4.05 lakh posted into conversion-cost build-up.
Settlement netting
Hyundai’s payable to the supplier = conversion invoice ₹2.31 crore + tooling-maintenance back-charge ₹16.76 lakh + RMPV claims ₹6.4 lakh = ₹2.54 crore gross. Hyundai’s TDS deduction under Section 194Q (purchase) and any quality debit notes flow through the settlement. The supplier’s books recognise revenue per stream — conversion, tooling-maintenance, RMPV — separately so that the OEM’s reconciliation tie-out on its own books closes.
How plastic injection moulding reconciliation ties into the wider auto stack
Plastic moulding reconciliation is one rail inside automotive component manufacturing reconciliation. The mould-amortisation discipline is set out in tooling cost recovery and amortisation. The RMPV contractual mechanics are in RMPV clause and the formula in RMPV calculation formula. For the ACMA framework on plastic moulding contracting, OEM-owned mould stewardship and resin RMPV norms see the Automotive Component Manufacturers Association of India (ACMA).
What automated reconciliation changes
Manual plastic moulding reconciliation across fourteen moulds, four resin families, three RMPV index references and quarterly tooling back-charges is a master-data discipline that breaks under volume — and where cycle-time drift and refurbishment-trigger slippage typically only surface at the next pricing renegotiation. Purpose-built auto-component reconciliation software India closes the resin-to-piece identity per mould per shift, drives the cycle-time-drift dashboard against contracted spec, ties RMPV claims to virgin-equivalent consumption with regrind credit applied, runs the supplier-owned mould Ind AS 16 amortisation and the OEM-owned mould tooling-maintenance back-charge calendar, and queues refurbishment triggers for OEM approval. TransactIG carries 24+ industry presets including plastic moulding configurations for OEM-versus-supplier mould stewardship, regrind-blend resin accounting, cycle-time monitoring and resin-family RMPV index mapping. Customer outcomes include match-rate improvement from 51% to 88%. Build is two-to-four weeks on AWS Mumbai (ISO 27001:2022). For the inbound match discipline across resin GRN, conversion invoice and tooling back-charge see three-way matching software India.