Home / Polymers / Sodium Tripolyphosphate (STPP)

Sodium Tripolyphosphate (STPP)

CAS Number

7758 29 4

Molecular Formula

Na5P3O10

Molecular Weight

367.86

Pack Size

50 kg bag packing

HSN Code

28353100

MSDS

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Sodium Tripolyphosphate (STPP) is purchased to make hard water behave. When it is right, cleaning improves, dispersion stabilises, and scale risk drops without constant adjustment. When it is wrong, you see it as slower dissolution, inconsistent builder response, and drift in slurry behaviour. SGS & Company supply Russia Meta Chem STPP with consistent concentration, documentation support, and dependable supply planning for repeat detergent and intermediate performance, backed by Chemical Suppliers in India.

About Sodium Tripolyphosphate (STPP)

Sodium Tripolyphosphate is a polyphosphate builder and sequestrant. Performance is tied to dissolution behaviour and how quickly it complexes hardness ions under real water conditions. Buyers typically evaluate assay, insolubles, and defined solution behaviour at plant water hardness and temperature, and these can be shared during quotation, along with COA format and acceptance criteria.

Sodium Tripolyphosphate (STPP) Structure

Hazard Symbols

Product Specifications

TEST	SPECIFICATION
P2O5 content	56% min
ROH 1 minute, Delta T	81°C min, 93°C max
ROH 5 MHYT, Delta T	84°C min, 95°C max
Delta T	105°C min
Volatiles premoi sturisation, oven method 1 hour at 150C	0.1% max
Na5P3O10 as percent of total phosphate content	92% min
Phase from 1	25% min, 55% max
Particle size distribution on 425 micron	5.0% max
Particle size distribution through 150 microns	0.75% min
Iron	300 mg per kg max
pH 1.0% in distilled water at 25C	9 min, 10 max
Water insoluble	0.10% max

TEST

Available Packaging

♦50 kg bag packing

Applications

Home Care

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Sodium Tripolyphosphate STPP is used as a builder to soften water and support dispersion so surfactants work efficiently under hardness load.

Chemical Intermediates

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Sodium Tripolyphosphate STPP is used where polyphosphate complexation supports a defined process need, often tied to hardness control or dispersion behaviour.

Safety & Handling

♦Control dust during charging and protect your eyes.
♦Store sealed and dry because moisture can change handling behaviour.
♦Follow the batch SDS for site-specific controls.

Hazard Symbols

FAQ's

Frequently Asked Questions

Common Questions About Reaching Us

For Sodium Tripolyphosphate (STPP) Meta Chem, lock P2O5, Na5P3O10 percent of total phosphate, Phase from 1, water insoluble, iron, and the particle size distribution lines. Those parameters are what typically separate a stable builder response from a batch that dissolves slower or leaves grit.

Sodium Tripolyphosphate (STPP) performance changes when dissolution speed and Phase profile shift, and when insolubles rise. In practice, the plant feels it as slower sequestration and more variability across water hardness. A timed dissolve check in site water is often more predictive than an assay alone.

For Sodium Tripolyphosphate (STPP), the fastest predictors are water insoluble, iron, particle size distribution, and a defined solution clarity check at the concentration you actually run. Test methods and acceptance criteria are available on request.

For Sodium Tripolyphosphate (STPP) bulk handling, the key risks are moisture pickup and bridging. Sites typically confirm dry receiving, sealed vents, dust extraction, drainable conveyors, and a discharge design that can handle cohesive powders without rat holing. Keep bulk systems segregated from acidic lines to avoid localised hydrolysis and deposits.

Sodium Tripolyphosphate (STPP) can hydrolyse in water during long holds, and heat accelerates this. Plants usually control temperature, residence time, and solution strength, and avoid storing high-strength solutions for extended periods if a consistent builder response is critical.

For Sodium Tripolyphosphate (STPP) Meta Chem, pricing typically depends on order volume, lane logistics, and whether you require tighter performance lines, such as Phase 1 and particle size controls to be held. Share your monthly offtake and destination to Get a Quote, subject to availability.

If your process is sensitive to Sodium Tripolyphosphate (STPP) Phase and ROH behaviour, plan lead time around lot reservation and avoid frequent source switching. SGS & Company can align a change control approach and dispatch planning during quotation, subject to availability. Get a Quote.