| 2 Material accounting policies 2.1 Basis of Preparation of Financial Statements (a)    Statement of Compliance with Ind AS The financial statements of the Company have beenprepared in accordance with Indian Accounting
 Standards (Ind AS) notified under Section 133 of
 the Companies Act, 2013 (the "Act") read with the
 Companies (Indian Accounting Standards) Rules,
 2015 and Companies (Indian Accounting Standards)
 Amendment Rules, 2016, as amended from time to
 time and other relevant provisions of the Act.
 Accounting policies have been consistently applied toall the years presented except where a newly issued
 accounting standard is initially adopted or a revision
 to an existing accounting standard requires a change
 in the accounting policy hitherto in use.
 The financial statements have been prepared as agoing concern on the basis of relevant Ind AS that are
 effective at the annual reporting date.
 (b)    Basis of measurement The financial statements have been prepared onhistorical cost convention on accrual basis, except for
 the following items in the balance sheet:
 i)    Certain financial assets and liabilities measuredeither at fair value or at amortised cost
 depending on the classification;
 ii)    Defined employee benefit liabilities arerecognised at the present value of defined
 benefit obligation adjusted for fair value of plan
 assets;
 (c)    Current and non-current classification All assets and liabilities have been classified as currentor non-current as per the Company's operating cycle
 and other criteria set out in the Schedule III to theAct. Based on the nature of services and the time
 between the rendering of service and their realization
 in cash and cash equivalents, the Company has fixed
 its operating cycle as twelve months for the purpose
 of current and non-current classification of assets and
 liabilities.
 The Company presents assets and liabilities inthe balance sheet based on current/ non-current
 classification.
 An asset is classified as current when it is: •    Expected to be realised or intended to be sold orconsumed in normal operating cycle
 •    Held primarily for the purpose of trading •    Expected to be realised within twelve monthsafter the reporting period, or
 •    Cash or cash equivalent unless restricted frombeing exchanged or used to settle a liability for
 at least twelve months after the reporting period
 A liability is classified as current when: •    It is expected to be settled in normal operatingcycle
 •    It is held primarily for the purpose of trading •    It is due to be settled within twelve months afterthe reporting period, or
 •    There is no unconditional right to defer thesettlement of the liability for at least twelve
 months after the reporting period
 Current assets / liabilities include the current portionof non-current assets / liabilities respectively. All
 other assets / liabilities including deferred tax assets
 and liabilities are classified as non-current.
 (d) Use of estimates The preparation of financial statements in conformitywith Ind AS requires the management of the Company
 to make judgments, estimates and assumptions to
 be made that affect the reported amounts of assets
 and liabilities on the date of financial statements,
 disclosure of contingent liabilities as at the date of
 the financial statements, and the reported amounts
 of income and expenses during the reported period.
 Estimates and underlying assumptions are reviewed
 on an ongoing basis. Revisions to accounting
 estimates are recognised in the period in which the
 estimates are revised.
 (e) Fair value measurement The Company's accounting policies and disclosuresrequire the measurement of fair values, for certain
 financial and non-financial assets and liabilities based
 on their classification.
 Fair value is the price that would be received to sellan asset or paid to transfer a liability in an orderly
 transaction between market participants at the
 measurement date.
 In estimating the fair value of an asset or liability, theCompany takes into account the characteristics of
 the asset or liability if market participants would take
 those characteristics into account when pricing the
 asset or liability at the measurement date.
 Fair values are categorized into different levels in afair value hierarchy based on the inputs used in the
 valuation techniques as follows:
 •    Level 1: quoted prices (unadjusted) in activemarkets for identical assets or liabilities.
 •    Level 2: inputs other than quoted pricesincluded in Level 1 that are observable for the
 asset or liability, either directly (i.e. as prices) or
 indirectly (i.e. derived from prices).
 •    Level 3: inputs for the asset or liability that are notbased on observable market data (unobservable
 inputs).
 When measuring the fair value of an asset or a liability,the Company uses observable market data as far as
 possible. If the inputs used to measure the fair value
 of an asset or a liability fall into different levels of the
 fair value hierarchy, then the fair value measurement
 is categorized in its entirety in the same level of the
 fair value hierarchy as the lowest level input that is
 significant to the entire measurement.
 The Company recognises transfers between levels ofthe fair value hierarchy at the end of the reporting
 period during which the change has occurred.
 For the purpose of fair value disclosures, the companyhas determined classes of assets and liabilities on
 the basis of the nature, characteristics and risks of
 the asset or liability and the level of the fair value
 hierarchy as explained above.
 2.2 Property, plant and equipment Property, plant and equipment are measured atcost less accumulated depreciation and impairment
 losses, if any. Cost comprises of purchase price,
 freight, non-refundable taxes and duties, specified
 foreign exchange gains or losses and any other cost
 attributable to bring the asset to its working condition
 for its intended use.
 Subsequent costs are included in the asset'scarrying amount or recognized as a separate asset,
 as appropriate, only when it is probable that future
 economic benefits associated with the item will flow
 to the Company and the cost of the item can be
 measured reliably. All other repairs and maintenance
 are charged to Statement of Profit and Loss during
 the year in which they are incurred.
 Advances paid towards the acquisition of property,plant and equipment outstanding at each balance
 sheet date is classified as "capital advances" and the
 cost of assets not ready to use before such date are
 disclosed under 'Capital work-in-progress' and not
 depreciated.
 Depreciation methods, estimated useful lives Depreciable amount for assets is the cost of an asset orother amount substituted for cost, less its estimated
 residual value. Depreciation on property, plant and
 equipment is provided on straight-line method over
 their estimated useful lives which are the same as
 prescribed in Schedule II to the Act, except for the
 following:
 Based on the technical experts assessment of usefullife, certain items of property plant and equipment
 are being depreciated over useful lives different from
 the prescribed useful lives under Schedule II to the
 Act. The management has assessed the useful life of
 such assets on the basis of technical expert advice
 and past experience in the industry as it believes that
 such estimated useful lives are realistic and reflect fair
 approximation of the period over which the assets
 are likely to be used.
 Depreciation on addition to property plant andequipment is provided on pro-rata basis from the
 date of acquisition. Depreciation on sale/deduction
 from property plant and equipment is provided up to
 the date of sale/deduction, as the case may be. Gains
 and losses on disposals are determined by comparing
 proceeds with carrying amount and are included in
 Statement of Profit and Loss.
 Assets held for sale Non-current assets held for sale are measured atthe lower of their carrying value and fair value of
 the assets less costs to sale. Assets and liabilities
 classified as held for sale are presented separatelyin the balance sheet. Property, plant and equipment
 once classified as held for sale are not depreciated/
 amortised.
 2.3    Intangible Assets Intangible assets are stated at cost less accumulatedamortisation and impairment. Intangible assets are
 amortised over their respective individual estimated
 useful lives on a straight-line basis, from the date that
 they are available for use. The estimated useful life of
 an identifiable intangible asset is based on a number
 of factors including the effects of obsolescence, other
 economic factors etc. Amortisation methods and
 useful lives are reviewed periodically including at
 each financial year end.
 Subsequent expenditure Subsequent expenditure is capitalised only when itincreases the future economic benefits embodied in
 the specific asset to which it relates.
 Amortisation Intangible assets with finite lives are amortised overthe useful economic life and assessed for impairment
 whenever there is an indication that the intangible
 asset may be impaired. The amortisation period and
 the amortisation method for an intangible asset with
 a finite useful life are reviewed at least at the end of
 each reporting period, with the effect of any change
 in the estimate being accounted for on a prospective
 basis. Changes in the expected useful life or the
 expected pattern of consumption of future economic
 benefits embodied in the asset are considered
 to modify the amortisation period or method, as
 appropriate, and are treated as changes in accounting
 estimates. The amortisation expense on intangible
 assets with finite lives is recognised in the statement
 of profit and loss unless such expenditure forms part
 of carrying value of another asset.
 Operating rights    3-10 Years Amortisation method, useful lives and residual valuesare reviewed at the end of each financial year and
 adjusted if appropriate.
 2.4    Impairment of non-financial assets At each reporting date, the Company assesseswhether there is any indication that an asset may
 be impaired, based on internal or external factors.
 If any such indication exists, the Company estimates
 the recoverable amount of the asset or the cash
 generating unit. If such recoverable amount of the
 asset or cash generating unit to which the asset
 belongs is less than its carrying amount, the carrying
 amount is reduced to its recoverable amount. The
 reduction is treated as an impairment loss and isrecognised in the Statement of Profit and Loss. If,
 at the reporting date there is an indication that a
 previously assessed impairment loss no longer exists,
 the recoverable amount is reassessed and the asset
 is reflected at the recoverable amount. Impairment
 losses previously recognised are accordingly reversed
 in the Statement of Profit and Loss.
 2.5 Financial instruments A financial instrument is any contract that gives rise toa financial asset of one entity and a financial liability
 or equity instrument of another entity.
 (a) Financial assets Initial recognition and measurement All financial assets are recognised in balance sheetwhen, and only when, the entity becomes party to the
 contractual provisions of the instrument and initially
 measured at fair value except for trade receivables
 which are initially measured at transaction price. In
 the case of financial assets not recorded at fair value
 through profit or loss, transaction costs that are
 attributable to the acquisition of the financial asset
 or liability are added to or deducted from the fair
 value.
 Purchases or sales of financial assets that requiredelivery of assets within a time frame established by
 regulation or convention in the market place (regular
 way trades) are recognised on the trade date, i.e., the
 date that the Company commits to purchase or sell
 the asset.
 Subsequent measurement For purposes of subsequent measurement, financialassets are classified into four categories:
 •    Debt instruments at amortised cost •    Debt instruments at fair value through othercomprehensive income (FVTOCI)
 •    Debt instruments and equity instruments at fairvalue through profit or loss (FVTPL) and
 •    Equity instruments measured at FVTOCIDebt instruments at amortised cost
 A 'debt instrument' is measured at the amortised costif both the following conditions are met:
 •    The asset is held within a business modelwhose objective is to hold assets for collecting
 contractual cash flows, and
 •    Contractual terms of the asset give rise onspecified dates to cash flows that are solely
 payments of principal and interest (SPPI) on the
 principal amount outstanding.
 After initial measurement, financial assets aresubsequently measured at amortised cost using the
 Effective Interest Rate (EIR) method. Amortised cost
 is calculated by taking into account any discount or
 premium on acquisition and fees or costs that are
 an integral part of the EIR. The EIR amortisation is
 included in finance income in the Statement of Profit
 and Loss. The losses arising from impairment are
 recognised in the Statement of Profit and Loss. This
 category covers Trade Receivables, Loans, Cash &
 Bank Balances and Other Receivables.
 Debt instruments at fair value through othercomprehensive income (FVTOCI)
 A 'debt instrument' is classified as at the FVTOCI ifboth of the following criteria are met:
 •    The objective of the business model is achievedboth by collecting contractual cash flows and
 selling the financial assets, and
 •    Contractual terms of the asset give rise onspecified dates to cash flows that are solely
 payments of principal and interest (SPPI) on the
 principal amount outstanding.
 Debt instruments included within the FVTOCIcategory are measured initially as well as at each
 reporting date at fair value. Fair value movements
 are recognised in the other comprehensive income
 (OCI). On derecognition of the asset, cumulative gain
 or loss previously recognised in OCI is reclassified
 to the Statement of Profit and Loss. Interest earned
 while holding FVTOCI debt instrument is reported as
 interest income using the EIR method.
 Debt instruments and equity instruments at fairvalue through profit or loss (FVTPL)
 FVTPL is a residual category for debt instruments. Anydebt instrument, which does not meet the criteria for
 categorization as at amortised cost or as FVTOCI, is
 classified as at FVTPL.
 Debt and Equity instruments included within theFVTPL category are measured at fair value with all
 changes recognized in the Statement of Profit and
 Loss.
 Equity instruments included within the FVTPLcategory are measured at fair value with all changes
 recognized in the Statement of Profit and Loss.
 Equity instruments measured at FVTOCI All equity investments in the scope of Ind AS 109 aremeasured at fair value. Equity instruments which are
 held for trading are classified as at FVTPL. For all other
 equity instruments, the Company decides to classify
 the same either as at FVTOCI or FVTPL. The Company
 makes such election on an instrument-by-instrumentbasis. The classification is made on initial recognition
 and is irrevocable.
 If the Company decides to classify an equityinstrument as at FVTOCI, then all fair value changes on
 the instrument, excluding dividends, are recognized
 in the OCI. There is no recycling of the amounts from
 OCI to Statement of Profit and Loss, even on sale of
 investment. However, the Company may transfer the
 cumulative gain or loss within equity.
 De-recognition The Company de-recognises a financial asset onlywhen the contractual rights to the cash flows from
 the asset expires or it transfers the financial asset and
 substantially all the risks and rewards of ownership of
 the asset.
 When the Company has transferred its rights toreceive cash flows from an asset or has entered into
 a pass-through arrangement, it evaluates if and to
 what extent it has retained the risks and rewards
 of ownership. When it has neither transferred nor
 retained substantially all of the risks and rewards of
 the asset, nor transferred control of the asset, the
 Company continues to recognise the transferred
 asset to the extent of the Company's continuing
 involvement. In that case, the Company also
 recognises an associated liability. The transferred
 asset and the associated liability are measured on a
 basis that reflects the rights and obligations that the
 Company has retained.
 Continuing involvement that takes the form of aguarantee over the transferred asset is measured at
 the lower of the original carrying amount of the asset
 and the maximum amount of consideration that the
 Company could be required to repay.
 Impairment of financial assets In accordance with Ind AS 109, the Company appliesexpected credit loss (ECL) model for measurement
 and recognition of impairment loss for the following
 financial assets and credit risk exposures:
 a)    Financial assets that are debt instruments andare measured at amortised cost e.g., loans,
 deposits and bank balance.
 b)    Trade Receivables that result from transactionsthat are within the scope of Ind AS 115.
 The Company follows 'simplified approach' forrecognition of impairment loss allowance on trade
 receivables. The application of simplified approach
 does not require the Company to track changes in
 credit risk. It recognises impairment loss allowance
 based on lifetime ECLs at each reporting date, right
 from its initial recognition.
 As a practical expedient, the Company uses a provisionmatrix to determine impairment loss allowance
 on portfolio of its receivables. The provision matrix
 is based on its historically observed default rates
 over the expected life of the trade receivables and
 is adjusted for forward looking estimates. At every
 reporting date, the historical observed default rates
 are updated and changes in the forward looking
 estimates are analysed.
 For recognition of impairment loss on other financialassets and risk exposure, the Company determines
 whether there has been a significant increase in the
 credit risk since initial recognition. If credit risk has
 not increased significantly, 12 quarter ECL is used to
 provide for impairment loss. However, if credit risk
 has increased significantly, lifetime ECL is used. If, in
 a subsequent period, credit quality of the instrument
 improves such that there is no longer a significant
 increase in credit risk since initial recognition, then
 the entity reverts to recognising impairment loss
 allowance based on 12 quarter ECL.
 Lifetime ECL are the expected credit losses resultingfrom all possible default events over the expected
 life of a financial instrument. The 12 quarter ECL is a
 portion of the lifetime ECL which results from default
 events that are possible within 12 months after the
 reporting date. ECL is the difference between all
 contractual cash flows that are due to the Company
 in accordance with the contract and all the cash flows
 that the Company expects to receive.
 When estimating the cash flows, the Company isrequired to consider:
 •    All contractual terms of the financial assets(including prepayment and extension) over the
 expected life of the assets.
 •    Cash flows from the sale of collateral held orother credit enhancements that are integral to
 the contractual terms.
 (b) Financial Liabilities Initial recognition and measurement Financial liabilities are classified, at initial recognition,as financial liabilities at fair value through profit or
 loss.
 All financial liabilities are recognized initially at fairvalue and, in the case of loans and borrowings and
 payables, net of directly attributable transaction costs.
 The Company's financial liabilities include trade and
 other payables, loans and borrowings.
 Subsequent measurement The measurement of financial liabilities depends ontheir classification, as described below:
 Financial liabilities at fair value through profit orloss include financial liabilities held for trading and
 financial liabilities designated upon initial recognition
 as at fair value through profit or loss. Financial
 liabilities are classified as held for trading if they are
 incurred for the purpose of repurchasing in the near
 term.
 Gains or losses on liabilities held for trading arerecognised in the Statement of Profit and Loss.
 Loans and borrowings After initial recognition, interest-bearing loans andborrowings are subsequently measured at amortised
 cost using the EIR method. Gains and losses are
 recognised in profit or loss when the liabilities are
 derecognised as well as through the EIR amortisation
 process.
 Amortised cost is calculated by taking into accountany discount or premium on acquisition and fees
 or costs that are an integral part of the EIR. The
 EIR amortisation is included as finance costs in the
 Statement of Profit and Loss.
 This category generally applies to interest-bearingloans and borrowings.
 Trade and other payables These amounts represent liabilities for goods andservices provided to the Company prior to the end
 of financial year which are unpaid. The amounts are
 unsecured and are usually paid as per agreed terms.
 Trade and other payables are presented as current
 liabilities unless payment is not due within 12 months
 after the reporting period. They are recognised
 initially at their fair value and subsequently measured
 at amortised cost using the effective interest method.
 De-recognition A financial liability is de-recognised when the obligationunder the liability is discharged or cancelled or
 expires. When an existing financial liability is replaced
 by another from the same lender on substantially
 different terms, or the terms of an existing liability
 are substantially modified, such an exchange or
 modification is treated as the derecognition of the
 original liability and the recognition of a new liability.
 The difference in the respective carrying amounts is
 recognised in the Statement of Profit and Loss.
 Offsetting of financial instruments Financial assets and financial liabilities are offset andthe net amount is reported in the balance sheet if
 there is a currently enforceable legal right to offset
 the recognised amounts and there is an intention to
 settle on a net basis, to realise the assets and settle
 the liabilities simultaneously.
 2.6    Taxes Tax expense for the year, comprising current tax anddeferred tax, are included in the determination of the
 net profit or loss for the year.
 (a)    Current tax Current tax assets and liabilities are measured atthe amount expected to be recovered or paid to the
 taxation authorities. The tax rates and tax laws used
 to compute the amount are those that are enacted or
 substantively enacted, at the year end date.
 The Company recognises interest levied and penaltiesrelated to income tax assessments in interest expense.
 (b)    Deferred tax Deferred tax is provided using the Balance Sheetmethod on temporary differences between the
 tax bases of assets and liabilities and their carrying
 amounts for financial reporting purposes at the
 reporting date. Deferred tax liabilities are recognised
 for all taxable temporary differences.
 Deferred tax assets are recognised for all deductibletemporary differences, the carry forward of unused
 tax credits and any unused tax losses. Deferred tax
 assets are recognised to the extent that it is probable
 that future taxable profit will be available against
 which the deductible temporary differences, and the
 carry forward of unused tax credits and unused tax
 losses can be utilized.
 The carrying amount of deferred tax assets is reviewedat each reporting date and reduced to the extent
 that it is no longer probable that sufficient future
 taxable profit will be available to allow all or part of
 the deferred tax asset to be utilized. Unrecognized
 deferred tax assets are re-assessed at each reporting
 date and are recognised to the extent that it has
 become probable that future taxable profits will allow
 the deferred tax asset to be recovered. Deferred tax
 assets and liabilities are measured at the tax rates
 that are expected to apply in the year when the asset
 is realized or the liability is settled, based on tax rates
 (and tax laws) that have been enacted or substantively
 enacted at the reporting date. Deferred tax relating
 to items recognised outside the statement of Profit
 and Loss is recognised outside the Statement of Profit
 and Loss (either in other comprehensive income or in
 equity). Deferred tax assets and deferred tax liabilities
 are offset if a legally enforceable right exists to set off
 current tax assets against current tax liabilities and
 the deferred taxes relate to the same taxable entity
 and the same taxation authority.
 2.7    Inventories Inventories consist of chemicals and consumables, stores and spares, are measured at the lower of costand net realisable value. Cost includes purchase price,
 duties and taxes (other than those subsequently
 recoverable by the Company from the concerned
 revenue authorities), freight inwards and other
 expenditure incurred in bringing such inventories to
 their present location and condition. Net realisable
 value is the estimated selling price in the ordinary
 course of business, less the estimated costs of
 completion and selling expenses. In determining the
 cost, First In First Out (FIFO) method is used. The
 carrying cost of inventories are appropriately written
 down when there is a decline in replacement cost of
 such materials.
 Work in progress are valued at the lower of costand net realisable value. Cost of work in progress is
 determined on the basis of cost and on the cost which
 comprises direct material consumed and human
 resource cost.
  
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