Replacement Filter Bag RFQ Checklist for Buyers
Answer-first
For a replacement filter bag quote, send the bag size, top and bottom construction, material if known, quantity, application, operating conditions, and clear photos of the old bag and installation area. A good RFQ helps the supplier check whether the request is for a dust collector filter bag, a liquid filter bag, or another filtration part before quoting.
This guide is written for buyers who need a practical checklist before contacting a supplier. It is not a promise that one material fits every application. Application requirements should be confirmed before quotation.
Why incomplete RFQs cause wrong quotes
Replacement filter bags often look simple, but small construction differences can change the quote and the fit. A missing snap band detail, wrong length, unclear ring type, or unconfirmed material can cause the wrong replacement to be selected.
Incomplete RFQs can also hide application risks. A dust collector bag operating with moisture, acid gas, abrasive dust, or aggressive pulse cleaning may need a different media or finish than a visually similar bag. A liquid filter bag used with high solids loading, viscous fluid, or an undersized housing may clog quickly even if the micron rating looks correct.
Core information buyers should send
| Information | Why it matters |
| Filter bag type | Separates dust collector bags, liquid filter bags, and special bags |
| Quantity | Affects quotation structure and material planning |
| Dimensions | Confirms diameter, flat width, length, and fit |
| Top construction | Snap band, ring, flange, drawstring, or other style |
| Bottom construction | Disc, reinforced bottom, tail, or custom finish |
| Material if known | Helps review polyester, polypropylene, PPS, PTFE, nylon, aramid, fiberglass, or other media |
| Application | Dust collection, liquid filtration, venting, process filtration, or another duty |
| Operating conditions | Temperature, fluid or gas chemistry, solids loading, moisture, and cleaning method |
| Photos | Reduces misunderstanding when drawings are unavailable |
Dust collector filter bag RFQ checklist
Send these details for baghouse and dust collector replacement bags:
- Bag diameter or flat width
- Total bag length
- Top style, including snap band, ring, flange, cord, or other connection
- Bottom style and reinforcement details
- Seam type if known
- Material or previous purchase record if available
- Surface treatment if required, such as singeing, glazing, membrane, or oil/water repellent treatment
- Dust type and dust abrasiveness
- Normal and peak temperature
- Moisture or condensation risk
- Acid gas, alkali, or other chemical exposure
- Cleaning method and pulse pressure if known
- Cage condition, cage diameter, and venturi details if used
- Failure location on the old bag if early failure occurred
If you are unsure how to measure a dust collector bag, the SFFILTECH filter bag measurement guide can help you prepare dimensions before sending an RFQ.
Liquid filter bag RFQ checklist
Send these details for liquid filter bag replacement:
- Bag size or housing model if known
- Ring type, such as steel ring, plastic ring, or sewn ring
- Bag length and diameter
- Material request, such as PP, PE, nylon mesh, or another media
- Micron rating
- Fluid type and temperature
- Flow rate or pump capacity if known
- Solids loading and particle type
- Chemical compatibility concerns
- Whether the bag is used for prefiltration, polishing, recovery, or protection of downstream equipment
- Current problem, such as short run time, bypass, seal leakage, or high pressure drop
Food-contact or regulatory documentation should be confirmed case by case before quotation.
Photos buyers should provide
Good photos are often more useful than a short text description. Send:
- Full filter bag photo
- Top close-up
- Bottom close-up
- Length photo with tape
- Diameter or flat-width photo with tape
- Label or previous packaging if available
- Filter cage photo for dust collector bags
- Tube sheet, venturi, or installation area photo if relevant
- Housing basket and ring seat photo for liquid filter bags
- Damaged area photos if the current bag failed early
Material and micron notes
Material names are useful, but they should not be used alone. Polyester, polypropylene, nylon, PPS, PTFE, aramid, and fiberglass-based media can each be suitable in some applications and unsuitable in others.
Micron rating also needs context. A finer liquid filter bag may improve particle capture, but it can increase pressure drop or shorten run time if the solids loading is high. A coarser bag may run longer but may not provide the required clarity. The best practical choice depends on fluid characteristics, particle size distribution, flow rate, housing fit, and maintenance expectations.
Common mistakes
| Mistake | Possible result |
| Sending only the material name | Construction and size may still be unclear |
| Measuring a stretched or damaged bag only | Replacement length may be wrong |
| Ignoring cage condition | A new dust bag can fail if the cage is corroded or bent |
| Choosing by temperature only | Moisture, oxygen, chemistry, and dust behavior may matter |
| Choosing only by micron rating | Flow rate and pressure drop may become a problem |
| Not sending photos | Supplier may need several clarification rounds |
FAQ
Can I request a quote without a drawing?
Yes. Clear measurements and photos can often support the first review. A drawing is helpful but may not be available.
Should I send a sample?
If the material, top style, or bottom construction is uncertain, a sample can help. Photos should still be sent first so the supplier can judge whether the item is recognizable.
Is one filter bag material suitable for all applications?
No. Material selection depends on operating conditions, fluid or gas characteristics, temperature, chemistry, solids loading, housing or cage fit, and maintenance.
Why did my current filter bags fail early?
Possible causes include wrong material selection, high temperature, moisture, chemical attack, abrasive dust, poor cage fit, bypass, high pressure drop, or cleaning settings. Photos of the failure area help with review.
What should I send if I need a quick quote?
Send quantity, dimensions, photos, material if known, application, operating conditions, and delivery country. Lead time depends on product specification, order quantity, and material availability.
Soft CTA
Prepare the checklist before contacting a supplier. For a more detailed industrial filter bag quotation reference, see the SFFILTECH replacement filter bag RFQ guide. For broader filter bag categories, review industrial filter bags.