INS 452 is the family of polyphosphates, long-chain condensation products of phosphoric acid. The most common form on Indian packs is sodium polyphosphate (also called Graham's salt or sodium hexametaphosphate, 452(i)). They show up in processed cheese, processed meat, frozen prawn and seafood, and some instant noodles seasoning packets, where they bind water, hold the protein structure, and sequester trace metals that would otherwise spoil flavour or colour. It is generally vegan and is permitted by FSSAI for specified food categories.
Quick Facts
INS Number
452
E-Number
E452
Category
Stabiliser
Veg Status
Vegan
FSSAI Status
Permitted by FSSAI
JECFA ADI
Not specified (1982)
Composition
Not a single compound. INS 452 is the umbrella code for long-chain phosphate-condensation products with four or more phosphorus atoms per molecule. Codex assigns five sub-codes: 452(i) sodium polyphosphate, also called Graham's salt or sodium hexametaphosphate (a glassy soluble polyphosphate; the 1996 JECFA specifications addendum defined sodium polyphosphates, glassy as the soluble product), 452(ii) potassium polyphosphate, 452(iii) sodium calcium polyphosphate, 452(iv) calcium polyphosphate, and 452(v) ammonium polyphosphate. On Indian packs the most common forms are 452(i) sodium polyphosphate (labelled as 'sodium polyphosphate' or 'sodium hexametaphosphate' or 'Graham's salt') and 452(v) ammonium polyphosphate (in some flour treatment uses). The 'polyphosphate' name on a label without a specific sub-code is usually 452(i) glassy sodium polyphosphate.
What is INS 452?
INS 452 is the family of polyphosphates, long-chain condensation products of phosphoric acid. The most common form on Indian packs is sodium polyphosphate (also called Graham's salt or sodium hexametaphosphate, 452(i)). They show up in processed cheese, processed meat, frozen prawn and seafood, and some instant noodles seasoning packets, where they bind water, hold the protein structure, and sequester trace metals that would otherwise spoil flavour or colour.
Why brands add it
Brands use polyphosphates because the longer phosphate chains hold water more strongly than the shorter di- or triphosphates, which lets processed meat retain more moisture during cooking, frozen seafood survive the freeze-thaw cycle with less drip, and processed cheese melt evenly without separating. Polyphosphates are also strong sequestrants - they grab trace iron, copper, and calcium that would otherwise catalyse off-flavours in noodle seasoning or fat oxidation in long-shelf-life products.
Where you'll find it
INS 452 commonly shows up on Indian packets in these categories:
processed cheese (slices and spreads)
processed meat (chicken sausage, ham, frankfurter, salami)
Polyphosphates are produced by controlled high-temperature heating of monosodium phosphate (or the equivalent potassium / calcium / ammonium phosphate), which drives off water and condenses many phosphate units into long chains. The glassy 452(i) form is then cooled rapidly to lock in the amorphous structure that gives it its solubility. No animal product is used in their manufacture.
FSSAI status and JECFA evaluation
FSSAI: Permitted by FSSAI as emulsifying salts, water-binding agents, and sequestrants under Schedule I of the FSS (Food Products Standards and Food Additives) Regulations 2011 for specified food categories with category-specific upper limits, often expressed as phosphorus. The processed-meat and processed-cheese categories specifically permit polyphosphates within the phosphate emulsifying-salt class; processed meat caps total added phosphate (expressed as phosphorus) per kilogram of finished product.
JECFA: JECFA's 26th meeting (1982) established a group MTDI of 70 mg/kg body weight expressed as phosphorus for the phosphate group (E338-E343 and E450-E452); this MTDI is still on the JECFA record. The committee's rationale was based on the lowest dietary phosphorus concentration (1% in diet) that caused nephrocalcinosis in rats, with a 100-fold safety factor. For sodium polyphosphates, glassy specifically, JECFA's meeting history runs 7th meeting 1963 (conditional 30-70 ADI), 14th 1970 (conditional 30-70 ADI), 17th 1973 (0-70 ADI), and 26th 1982 (the current group MTDI 70 mg/kg bw as P). EFSA's 2019 re-evaluation set a more conservative group ADI of 40 mg/kg body weight per day expressed as phosphorus for the phosphate group (E338-E341, E343, E450-E452); JECFA has not aligned with the revision. EFSA's ADI does not apply to people with moderate-to-severe chronic kidney disease, which the panel explicitly noted as a vulnerable population.
Also known as
On packets, in recipes, and in conversation, INS 452 is also called:
JECFA's 26th meeting (1982) set a group MTDI of 70 mg/kg body weight expressed as phosphorus for the phosphate-additive group, and EFSA's 2019 re-evaluation set a more conservative group ADI of 40 mg/kg body weight per day expressed as phosphorus, equivalent to about 2,800 mg of phosphorus per day for a 70 kg adult. Polyphosphates are the longest-chain form in the phosphate emulsifying-salt family, so they appear at higher per-kg use levels in processed meat and frozen seafood than the di- or triphosphates. A typical 50 g serving of processed cheese or processed meat contributes roughly 30 to 100 mg of phosphorus from added emulsifying salt; that is small for a 70 kg adult against the 2,800 mg/day ADI but a meaningful share of a child or adolescent's allowance, especially when many phosphate-containing processed foods are eaten in the same day. EFSA's 2019 panel found that dietary phosphate intake may exceed the ADI for infants, toddlers, and children at average consumption levels, and for adolescents on high-processed-food diets; the regulator's response was a tighter ADI, not a ban on the food permission. EFSA's ADI does not apply to people with moderate-to-severe chronic kidney disease, where high dietary phosphate intake is linked to cardiovascular risk; CKD patients should manage dietary phosphate with their nephrologist. For specific CKD or paediatric questions, talk to a doctor or registered dietitian; this entry is regulatory background, not medical advice.
Is INS 452 vegetarian?+
Vegan. Polyphosphates are produced by controlled high-temperature heating of monosodium phosphate (or the equivalent potassium / calcium / ammonium phosphate), which drives off water and condenses many phosphate units into long chains. The glassy 452(i) form is then cooled rapidly to lock in the amorphous structure that gives it its solubility. No animal product is used in their manufacture.
Is INS 452 permitted by FSSAI?+
Permitted by FSSAI as emulsifying salts, water-binding agents, and sequestrants under Schedule I of the FSS (Food Products Standards and Food Additives) Regulations 2011 for specified food categories with category-specific upper limits, often expressed as phosphorus. The processed-meat and processed-cheese categories specifically permit polyphosphates within the phosphate emulsifying-salt class; processed meat caps total added phosphate (expressed as phosphorus) per kilogram of finished product.
What is INS 452 used for?+
Brands use polyphosphates because the longer phosphate chains hold water more strongly than the shorter di- or triphosphates, which lets processed meat retain more moisture during cooking, frozen seafood survive the freeze-thaw cycle with less drip, and processed cheese melt evenly without separating. Polyphosphates are also strong sequestrants - they grab trace iron, copper, and calcium that would otherwise catalyse off-flavours in noodle seasoning or fat oxidation in long-shelf-life products.
Is INS 452 (also written as E452) the same thing?+
Yes. INS 452 (the Codex International Numbering System used by FSSAI) and E452 (the European E-number system) refer to the same compound. The digits are identical for almost all common additives. Indian packets may show either form, or the common name (polyphosphates).
This page summarises FSSAI's permission status and JECFA's scientific evaluation. It is not medical or dietary advice. Manufacturer ingredient sourcing can vary, especially for source-dependent additives - the Indian veg/non-veg dot logo on the pack is the brand's declaration. For health decisions, consult a doctor or registered dietitian.