When a buyer asks for a liquid filter bag or seal quotation, the material name is only one part of the review. The same filter bag size may be used with water-based fluids, oils, solvents, acidic liquids, alkaline liquids, or mixed process fluids.

That is why chemical compatibility should be reviewed case by case before confirming material selection. A supplier cannot properly review a filter bag, ring, seal, or gasket request from a short description such as "chemical liquid" or "acid solution" alone. Better RFQ information helps suppliers review the application before quotation, ask fewer questions, and avoid guessing about the operating conditions.

This guide is written for buyers who want to prepare a clearer request before asking for a filter bag or seal quotation. It is not a chemical compatibility chart, and it is not a promise that any material fits every chemical or every operating condition.

1. Identify the Chemical Name and Concentration

Start with the chemical name as clearly as possible. If the liquid is a mixture, list the main components that are known. If the chemical is supplied under a trade name, include the generic chemical name or an SDS/MSDS if available.

Concentration is also important. A diluted solution and a concentrated solution may need different review. A supplier may not be able to evaluate the request if the buyer only says "acid," "alkali," "solvent," or "cleaning liquid" without concentration information.

Useful details include:

chemical name or trade name;
main components if the fluid is a mixture;
concentration or percentage by weight/volume if known;
whether the concentration changes during operation;
whether the liquid is mixed, diluted, heated, cooled, or reused.

This information helps suppliers review the application before quotation. It does not replace a technical review or final confirmation of material suitability.

2. Share Operating Temperature, pH, and Fluid Condition

Chemical compatibility review is not only about the chemical name. Temperature, pH, exposure time, and operating pattern can also affect the review.

For example, a liquid may be handled at room temperature in one process and at a higher operating temperature in another process. A batch process may expose the filter bag for a short period, while a continuous operation may expose the bag and seal for longer. These details can change how the supplier reviews the application.

Before quotation, prepare:

normal operating temperature;
highest expected temperature;
pH range if known;
whether the fluid is heated or cooled;
whether operation is batch or continuous;
expected contact time;
whether the fluid contains oxidizing or reducing components, if known;
whether the process includes cleaning chemicals.

If these details are unknown, say they are unknown. That is still better than leaving the supplier to assume the conditions.

3. Clarify the Fluid Type and Process Environment

A short RFQ often says only "liquid filtration," but that may not be enough. The supplier needs to understand the general fluid type and process environment before reviewing the filter bag and seal request.

Describe whether the fluid is:

water-based;
oil-based;
solvent-based;
acidic;
alkaline;
high-solids;
viscous;
recycled or reused;
used in prefiltration, polishing, recovery, or equipment protection.

Avoid turning this into a material-selection conclusion. The purpose is not to say that one material is suitable for a certain fluid. The purpose is to give enough information so the supplier can review the request before quotation.

Also include flow rate, pressure, and housing information if available. A filter bag may need to be reviewed together with the bag housing, basket support, sealing surface, and operating pressure. Seal leakage or bypass may involve both the filter bag and housing/seal interface.

For broader sizing and housing context, see the liquid filter bag selection guide and bag filter housing selection guide.

4. Provide Current Filter Bag, Ring, Seal, or Gasket Details If Known

If the existing filter bag works well, the current material and construction can be useful reference information. If it fails early, the same information can help the supplier review what may have changed.

Filter bag details include:

bag size or housing model;
micron rating;
filter bag material if known;
ring type, such as plastic ring, steel ring, or sewn ring;
seam type if visible;
top and bottom construction;
quantity required;
previous purchase record or label if available.

Seal and gasket details also matter. If the application uses an O-ring, gasket, or sealing collar, provide the material if known. Do not assume the seal material is correct just because the filter bag material looks correct. Seal material should be reviewed together with liquid chemistry, temperature, pressure, housing design, and application requirements.

If the current seal material is unknown, photos of the housing, ring seat, gasket area, and old seal can still help the supplier identify what needs to be checked.

For broader selection background, see how to select a liquid filter bag.

5. Send SDS/MSDS and Existing Equipment Information If Available

An SDS or MSDS can help suppliers review the application, especially when the chemical name, concentration, or mixture information is unclear. It may include composition, handling information, temperature notes, or other information that helps the review.

However, an SDS/MSDS does not automatically confirm the correct filter bag or seal material. It should be treated as supporting information for review, not as final confirmation.

Equipment information can also reduce back-and-forth before quotation. If available, send:

bag filter housing model;
housing material;
basket size;
connection size;
operating pressure;
flow rate or pump capacity;
current filter bag size;
photos of the housing interior and sealing area.

For replacements, old labels, packaging, previous order information, or drawings can also help.

6. Explain Previous Use History and Failure Symptoms

If the current filter bag or seal failed early, do not only ask for the same replacement. Describe what happened.

Useful symptoms include:

bag swelling;
media softening or brittleness;
ring deformation;
seal leakage;
bypass;
short run time;
rapid pressure drop increase;
unusual odor or discoloration;
solids passing through the bag;
gasket cracking or flattening;
repeated replacement problems.

These symptoms do not prove the cause by themselves. They simply help the supplier decide what information to review before quotation. Photos of the failed area are often more helpful than a short text description.

If the existing product has worked well, say that too. A successful history can be useful reference information, especially when the buyer wants to keep the same design or compare a new quotation with a previous supply.

Practical RFQ Checklist

Before asking for a filter bag or seal quotation, prepare as many of these items as possible:

chemical name or trade name;
concentration or dilution ratio;
SDS/MSDS if available;
temperature range;
pH range if known;
fluid type, such as water-based, oil-based, solvent-based, acidic, or alkaline;
solids loading and particle type;
viscosity if known;
flow rate or pump capacity;
operating pressure;
batch or continuous operation;
current filter bag size;
current micron rating;
current bag material if known;
ring type and sealing method;
gasket or O-ring material if known;
housing model or photos;
current problem or failure symptoms;
quantity and delivery country.

If some information is unknown, list it as unknown. A clear "unknown" is better than a silent gap because it tells the supplier what still needs confirmation.

Photo Checklist

Photos can help when drawings are not available. Useful photos include:

full view of the existing filter bag;
top ring or collar close-up;
bottom construction close-up;
label or package photo;
bag length measurement;
bag diameter or flat-width measurement;
housing basket photo;
ring seat or sealing area photo;
gasket or O-ring photo;
failed or swollen area photo;
process equipment nameplate if relevant and safe to share.

Do not send confidential plant information if it is not needed. Focus on the filter bag, seal, housing, label, and measurement details that help identify the product and application.

Questions Buyers Can Send Before Quotation

A clear RFQ message can include questions such as:

What chemical and concentration information do you need before reviewing filter bag material?
Should I send the SDS/MSDS before quotation?
Do you need temperature and pH information before confirming material selection?
Should the seal or gasket material be reviewed together with the bag material?
Which photos would help you identify the current filter bag and housing?
If the current bag failed early, what symptoms should I describe?

These questions keep the discussion focused on information collection and review, not on assumptions.

FAQ

Can a supplier choose the filter bag material from the chemical name alone?

Usually, the chemical name alone is not enough. Concentration, temperature, pH, exposure time, flow conditions, solids loading, housing design, and seal material can all affect the review.

Is SDS/MSDS information useful before quotation?

Yes. SDS or MSDS information can help suppliers review the application, especially when the chemical is a mixture or trade-name product. It should still be combined with operating temperature, concentration, pH, and equipment information.

Should seal and gasket materials be reviewed separately?

Yes. Filter bag media and seal materials can face different contact conditions. The ring, gasket, O-ring, and housing sealing surface should be reviewed together with the liquid chemistry and operating conditions.

What if I do not know the current filter bag material?

Send photos, measurements, labels, previous order information, and application details if available. The supplier may still need a sample or additional confirmation, but clear information helps reduce back-and-forth.

Does this checklist confirm chemical compatibility?

No. This checklist helps buyers prepare information before quotation. Final material selection should be confirmed according to chemical conditions, operating temperature, application requirements, and supplier review.

Soft CTA

Before requesting a filter bag or seal quotation, prepare the chemical name, concentration, temperature, pH, SDS/MSDS if available, current bag and seal information, photos, and operating symptoms. A complete RFQ helps suppliers review the application before quotation and reduces unnecessary back-and-forth before confirming material selection.

Chemical Compatibility Questions to Send Before Filter Bag and Seal Quotation