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|Grade Standard||Reagent Grade|
|Packaging Size||25/50 kgs|
|Cas Number||CAS 7681-57-4|
|Molecular Weight (g per mol)||190.1|
|pH Value||3.5 to 4.5|
|Appearance||yellowish-white crystalline powder|
|Physical appearance||White, shining crystalline material|
|Application||Lithography & photographic use and X-ray fixer and platting|
|Assay as Na2S2O5|
95 % Min
|Assay as (SO2 )|
64 % Min
|Solubility (10 % Aquous Soln)||V. S. Hazy to clear solution|
|pH of 5% Solution|
3.5 to 4.5
Echem.com.bd opens the doorway for everybody to shop over the Internet. Our dedicated Echem quality assurance team works round the clock personally to make sure the right packages reach on time. Our services are at your doorsteps with an affordable delivery charge. We process all deliveries through reputed courier services as well as our in-house delivery team. We deliver products all over Bangladesh as well as the world. If there is any modification in the delivery charge for a particular item, it is mentioned in product details.
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Delivery Timeline: Delivery might take longer than the usual timeframe/line to be followed by Echem. The delivery timeframe is only subject to estimation and please consider and calculate the announced timeframe as working days. It might vary depending upon the circumstances. Delivery might be delayed due to force majeure events which include, but not limited to, political unrest, political event, national/public holidays/official holiday(s), pandemics, etc, also for the supplier delay for the mass number of orders and for logistic partners; ie: courier services.
Order after 6 PM will be considered as an order of the next business day. Our business days exclude government holidays / public holidays.
Note: It is requested to the respected customers to refrain from buying excessive goods by being panicked. We are unable to entertain any bulk quantity during COVID-19. Delivery may delay due to COVID-19.
Exceptional Delivery: There are some exceptional items imported from outside Bangladesh. These items can take more days to reach you.
You can make your purchases on Echem and get delivery from anywhere in the world. Delivery charge varies according to customers' country. In the case of paid order, Echem.com.bd cannot be held liable if the customer does not receive it within 2 months.
We provide a great customer experience each time you shop with your Echem. If you are not satisfied with your purchase, we ensure a ‘Replacement Guarantee’. We will replace your purchased product if the product has any defect from its manufacturer or if the product is not the same one you ordered. Please check your products in front of riders or courier service agents to avail of replacement service.
All you need to do is give us a call or drop an email at email@example.com within a period of 24 hours from the date of delivery. However, please return the product with the tags intact and in their original packaging, in an unwashed and undamaged condition. Replacement for products is subject to inspection and checking by the Echem team. Replacement cannot be possible if the product is burnt, damaged by a short circuit, broken by the customer, or damaged while using by the customer.
We give the option of taking back the product from your doorstep at Dhaka. If reverse pickup is not possible from your doorstep, you can send it by courier to our office address (Hazi Yusuf Mansion,56,Midford Street,Babu Bazer,Dhaka-1100). Damages due to neglect, improper usage, or application will not be covered under our 'Replacement Guarantee’.
In case of product's sold out at the merchant's end, the customer can choose any other product from our website or can keep the amount debited to his Echem account as shopping credit.
If any order is canceled, payment against such order will generally be refunded within 15 working days, but the refund process may take more time depending upon the payment service gateway provider’s clauses. Provided that the received cashback amount, if any, will be adjusted with the refund amount. The refund will be initiated within the same payment channel i.e. if the customer pays via bKash, then the customer will be refunded through bKash. The customer cannot be refunded via any other payment channel. But Echem retains the right and has the right to consider/reconsider refund via another flexible channel(s) to make the refund system faster or to make it easier for the customer.
The customer will not be eligible for any cashback/bonus against his principal amount in case of refunds because if the order is canceled, its related cashback will also be canceled. Echem is not bound to pay any kind of service charge or cost for the refunded amount.
In case of refunding card payment, the refund will be returned directly to the customer's debit/credit card if the customer claims a refund to his bank. Then we will be informed about it via sManager and take necessary initiatives. Card payment can be refunded only to the card holder's account via bank and cannot be refunded partially as per policy.
Shopping Credit / Reward Points can not be cash refunded, only to be refunded as shopping credit/reward point.
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