NaOH 99% Min
Caustic Soda Flakes 99% Sodium Hydroxide
Thin white sodium hydroxide flakes at 99.0% NaOH minimum with the tightest chloride and iron limits in our range. Packed in 25 kg bags or jumbo bags with customised labels accepted and shipped within 7 to 10 days after order confirmation.
Product Overview
Caustic Soda Flakes 99% Explained
Caustic soda flakes, also known as sodium hydroxide, is an inorganic compound with the chemical formula NaOH. It is strongly alkaline and highly corrosive. It works as an acid neutraliser, a masking and precipitating agent, a chromogenic agent, a saponifying agent, a peeling agent and a detergent.
The flake form has more surface area per kilogram than a pearl, so it goes into solution quickly. That is why flakes remain the default in paper mills, textile mills and soap plants where a batch tank has to be brought to strength inside a shift.
- Purity
- 99.0% Min
- Formula
- NaOH
- Standard
- GB 209-2006
- Packing
- 25 kg or jumbo bag
- Lead time
- Within 7 to 10 days after order confirmation
- Transport
- UN 1823 class 8
Key Benefits
Why Buyers Specify This Grade
- 99.0% NaOH minimum with chlorides at 0.03% maximum and iron at 0.005% maximum
- Fast dissolution in stirred water for batch make up
- 25 kg bags or jumbo bags to match your handling equipment
- Customised packaging and labels accepted
- Shipment within 7 to 10 days after order confirmation
- Shipped by sea or by railway depending on availability to your destination
Who It Is For
Who Benefits Most
- Pulp and paper mills running delignification and bleaching
- Textile mills scouring mercerising desizing and making viscose
- Soap and synthetic detergent producers
- Refineries washing acidic residues from product streams
- Alumina refineries electroplaters and metal finishing shops
- Waste water plants adjusting pH and precipitating metals
Application Scenarios
Where This Grade Is Used
The list below reflects the applications our customers actually buy this grade for.
- Paper making — delignification of wood so that cellulose pulp can be separated from lignin
- Refined petroleum — washing residual acidic substances out of products after sulphuric acid treatment
- Textile — concentrated solution treatment of cotton and linen and production of viscose fibres
- Printing and dyeing — removing wax oil and starch from cotton fabric and improving dye uptake
- Soap making
- Chemical industry — metal sodium electrolytic water borax sodium metasilicate sodium phosphate sodium dichromate and sodium sulphite
- Metallurgical industry
- Waste water treatment — adjusting pH so that resources can be recovered
- Pharmaceutical solutions — alkalising a solution or regulating its pH value
- Electroplating and tungsten smelting
- Leather industry
- Detergent chemistry — formic acid oxalic acid borax phenol sodium cyanide soap and synthetic detergent
- Textile printing and dyeing — desizing scouring and mercerising agent and dye solvent
- Smelting — aluminium hydroxide alumina and metal surface treatment agents
- Adhesives — starch gelatiniser and neutraliser
- Manufacture of phosphate and manganate
- Pesticide manufacturing
Pulp and Paper
Delignification pulping and bleaching lines that consume caustic soda every day
See The Application
Textile and Dyeing
Scouring mercerising desizing and viscose fibre production in textile mills
See The Application
Alumina and Metallurgy
Bauxite digestion alumina refining electroplating and metal surface treatment
See The ApplicationProblems It Solves
What This Grade Fixes On Your Site
Slow Batch Make Up
Flakes present a large surface area for their mass, so a stirred tank reaches working strength faster than with a coarser solid form.
Iron Staining In Sensitive Processes
Iron as Fe2O3 is held at 0.005% maximum, which is ten times tighter than our pearl and solid grades and matters in textile and paper applications.
Chloride Sensitive Equipment
Chlorides are held at 0.03% maximum, which helps where stainless steel corrosion is a concern in the dosing loop.
Handling Big Volumes By Hand
Jumbo bags remove most of the manual bag cutting on a site that consumes several tonnes a day.
Technical Features and Specifications
Declared Limits and Physical Properties
| Item | Specification |
|---|---|
| Purity NaOH | 99.0% Min |
| Carbonate Na2CO3 | 0.5% Max |
| Chlorides NaCl | 0.03% Max |
| Iron Fe2O3 | 0.005% Max |
Sodium hydroxide NaOH produced as industrial grade caustic soda to GB 209-2006. No fillers and no additives. Carbonate chloride and iron are the declared residual limits.
- Thin white flake solid appearance
- Strongly alkaline and highly corrosive
- Used as acid neutraliser masking agent precipitating agent chromogenic agent saponifying agent peeling agent and detergent
- Classified UN 1823 sodium hydroxide solid class 8 for transport
- Packed in 25 kg bags or jumbo bags with customised packaging and labels accepted
Manufacturing Process
From Production Line To Sealed Container
25 kg bag or jumbo bag. Customised packaging and labels are accepted. Shipping by sea or railway upon availability.
Production
Industrial grade caustic soda produced strictly to the national standard GB 209-2006.
Flaking
Molten caustic soda is flaked onto a chilled surface and broken into thin plates.
Bagging
Flakes are packed into 25 kg bags or jumbo bags on our own line and sealed.
Warehousing
Sealed bags are stored under cover so the product does not pick up moisture.
Loading
Bags are palletised or floor stacked and the container is squared off before sealing.
Quality Control and Standards
Checked Before It Leaves Our Yard
Production of industrial grade caustic soda follows the national standard GB 209-2006. Export products are checked by quality inspection agencies such as SGS CIQ and INTERTEK.
- Every batch produced to GB 209-2006 industrial grade specifications
- Flake thickness and appearance checked during production
- Purity carbonate chloride and iron confirmed against the specification
- Net weight 25.0 kg and gross weight 25.1 kg verified on the bag
- Export lots inspected by SGS CIQ or INTERTEK at your instruction
Tell us which certificate or document set your import requires and we will confirm what we are able to issue for your shipment before you place the order.
Customisation Options
What We Can Change For You
- 25 kg bags or jumbo bags
- Customised packaging and printed labels with your brand
- Palletised or floor stacked loading
- Sea or railway routing upon availability
- Choice of third party inspection agency
Comparison With Other Products
How This Grade Compares With The Rest Of Our Range
| Product | Physical form | NaOH | NaCl | Fe2O3 |
|---|---|---|---|---|
| Caustic Soda Pearls 99% | Free flowing granules | 99.0% Min | 0.05% Max | 0.05% Max |
| Caustic Soda Flakes 99% | Thin flakes | 99.0% Min | 0.03% Max | 0.005% Max |
| Caustic Soda Solid 99% | Compact solid | 99.0% Min | 0.05% Max | 0.05% Max |
Need the reasoning behind the choice rather than the numbers? Read caustic soda pearls versus flakes.
Use Guide
Making Up A Solution Safely
Sodium hydroxide releases a large amount of heat when it dissolves. The order in which you combine the materials is the single most important control.
- Always add flakes to water and never water to flakes.
- Charge the flakes slowly into stirred cold water so the exotherm is carried away.
- Let the solution cool before transferring or dosing it.
- Use chemical splash goggles a face shield gloves and chemical resistant clothing.
- Reseal part used bags at once. Open flakes absorb moisture and carbon dioxide from air.
- Store dry and away from acids aluminium zinc and organic material.
Storage
Keeping The Product In Specification
- Store in a dry covered area away from rain and standing water
- Keep bags closed and reseal any pack that has been opened
- Segregate from acids aluminium zinc and organic materials
- Keep the class 8 label visible on stacked stock
- Rotate stock so older pallets are consumed first
Related Products
Other Forms From The Same Line
NaOH 99% MinCaustic Soda Pearls 99%
Granulated sodium hydroxide in free flowing white pearls at 99% minimum purity packed in 25 kg bags
View Specifications
NaOH 99% MinCaustic Soda Solid 99%
Solid sodium hydroxide at 99% minimum purity produced on the same line and to the same GB 209-2006 standard
View SpecificationsRelated Articles
Technical Reading For This Grade
Comparison GuideCaustic Soda Pearls vs Flakes
Which physical form dissolves faster dusts less and suits your dosing equipment
Read The Guide
Design GuideCaustic Soda Packaging and Storage
Bag construction pallet patterns warehouse conditions and shelf life in humid climates
Read The Guide
Buying GuideBuying Caustic Soda From China
Specification checks inspection options container maths and the documents you must receive
Read The GuideFAQ
Caustic Soda Flakes 99% Questions
Answers to the questions buyers ask us most often before placing a first order
Purity NaOH 99.0% minimum, carbonate Na2CO3 0.5% maximum, chlorides NaCl 0.03% maximum and iron Fe2O3 0.005% maximum.
Yes. Flakes are packed in 25 kg bags or in jumbo bags. Tell us which handling equipment you use and we will recommend the pack.
Customised packaging and labels are accepted. Send the artwork and bag size with your enquiry.
Lead time is within 7 to 10 days after order confirmation. Shipping is by sea or by railway depending on availability to your destination.
The flake grade is held to 0.005% maximum iron because it is widely used in textile printing and dyeing and in paper making where iron can show up as staining.
It is used for delignification. Adding caustic soda solution dissolves and separates the non cellulose components of the wood so that pulp with cellulose as the main component is produced.
Quote Caustic Soda Flakes 99% For Your Next Shipment
Send the quantity the packaging and the destination port. We reply with a price a specification sheet and a realistic loading date.