Start with the purchasing decision
A fill power number becomes useful when the buyer knows what decision it supports. A development sample may help select a filling. A shipment report may support acceptance of an identified production lot. A report supplied as a general example shows the format and the tests performed on that sample; its relationship to your order still needs to be established.
At CircuDown, recycled down and recycled feather sourcing starts with the intended application and a written material brief. For a jacket, duvet or sleeping bag, describe the proposed filling before comparing reports. Species, colour, composition and the required certification belong alongside the loft target, not inside the fill power number.
What fill power measures
Fill power is a measurement of the volume occupied by a specified mass of filling under a prescribed load and procedure. The material is tested under defined conditions. Down content is a composition measurement, while fill weight is the quantity placed in a product. These are separate purchasing variables.
A loft result is useful for comparing materials tested on a comparable basis. A jacket's warmth also depends on construction and the amount and distribution of filling. Treat a fill power report as one part of the material assessment, followed by trials in the intended shell and construction.
Read the units exactly as reported
Record the complete unit printed on the report, including the mass basis. Cubic inches per ounce, cubic centimetres per gram and a height reading from a specified measuring apparatus are not interchangeable labels. A bare “700” leaves the buyer without enough information to compare results.
The expression “down power” is also used in some markets. A mathematical unit conversion does not reproduce another laboratory procedure. When the destination market requires a different method, agree whether a new test is needed rather than treating a converted number as a certified result.
Use this report-reading table
Work through the fields in order. A missing item is a clarification task, not automatic evidence that the supplier or laboratory has done something wrong. Keep the original report file and record the response beside the comparison sheet.
| Report field | What to read | Buyer action |
|---|---|---|
| Report identity | Laboratory, report number, issue date and any revision | Keep the complete report, including notes and all pages. |
| Sample identity | Submitted description, sample reference and linked lot | Match the reference to the sample bag and proposed order. |
| Test reference | Method, edition where stated, units and any deviation | Compare against the method written in the purchase specification. |
| Preparation | Conditioning procedure and relevant preparation notes | Separate results produced under different conditioning conditions. |
| Result | Reported value, unit, repetitions or summary as available | Use the stated result; clarify rounding and the agreed acceptance rule. |
| Context | Who selected the sample and what it represents | Distinguish a selected development sample from a sampled shipment lot. |
Why conditioning changes the comparison
Compression, transport and storage can affect the loft observed when a bag is opened. Laboratory conditioning prepares the material for measurement using a stated procedure. IDFL describes different conditioning approaches; results produced after different preparation cannot be assumed to answer the same comparison question.
For a supplier comparison, place conditioning in its own column. Two reports may name the same broad test family while using different preparation or reporting bases. Send the complete reports to the laboratory when clarification is needed; a screenshot of the headline number may omit the qualification that explains the difference.
Separate incoming appearance from conditioned performance
If the delivered material appears compressed, record the packaging, opening date and condition before changing it. Compare incoming observations with the agreed inspection process. Separately review the conditioned laboratory result against the test specification. This prevents an informal bag-opening assessment from being confused with an agreed laboratory acceptance test.
Compare results against an agreed acceptance rule
Write down whether the stated fill power is a development target, a contractual minimum or a value measured on a particular sample. Those descriptions carry different meanings. A quotation that names a target does not establish the result for an untested future lot.
Before testing, settle the laboratory, method, sampling responsibility and acceptance criteria. If a result is close to a limit, the agreed decision rule matters. Review any stated uncertainty or rounding information with the laboratory rather than inventing an extra tolerance after seeing the result. Where buyer and supplier results differ, check sample identity and preparation before ordering another test.
- Record the specimen or sample reference and the lot it is intended to represent.
- Use one comparison column for the original result and another for method or conditioning differences.
- Define the response to an unclear result: clarification, agreed retest or further product trial.
- Record who may release the material and who approves any specification change.
Practical sourcing note
“700 FP recycled down” is a starting point, not a complete purchasing specification. Add duck or goose, white or grey, down content and its component definition, the exact fill power method and units, conditioning, recycled-content or certification requirements, estimated quantity and destination. Mark whether 700 is a target or an agreed acceptance minimum. Include the report and lot reference when discussing existing results. If the material is intended for a new shell fabric, reserve enough time for a product trial as well as laboratory evaluation. Availability and achievable specifications remain subject to confirmation for the project.
Connect the report to product trials and bulk approval
A high loft value cannot tell a sewing team where filling may escape from a seam. Test the proposed material in the actual fabric and construction, recording fill weight and relevant trial conditions. IDFL's finished-product downproofness guidance distinguishes leakage through fabric from leakage at seams or stitch lines.
After development approval, keep the specification revision and approved sample reference connected to the order. The reference sample supports comparison; the production lot still has its own identity and agreed verification requirements. A report on the reference sample is not automatically a report on every later shipment.
Prepare a report review with CircuDown
Share the application, your target specification and the complete report you want to discuss. Identify any field that is missing or unclear and whether the decision concerns a sample, supplier comparison or bulk lot. Laboratory arrangements, sample quantities, test costs, document availability and timing are confirmed for the individual project.
Questions, answered.
Can recycled down reach 700 fill power?
Recycled origin alone does not determine a fill power result. A 700 requirement needs a suitable material and a report using the agreed method, conditioning and units. This guide does not establish that a particular CircuDown lot is available at that value.
Does 700 fill power mean 700 grams of down?
No. Fill power is a loft measurement under a defined test procedure. Grams of filling in a jacket or duvet describe fill weight, which is a different variable.
Can I compare EN, JIS and US results directly?
Compare the complete methods, units and preparation first. Different procedures may produce results that are not directly comparable. A unit conversion alone does not replace testing to the required method.
Does higher fill power always mean a better product?
The appropriate filling depends on the product design, fill weight, fabric, required performance and budget. Validate the material in the intended product rather than selecting it on one number alone.
Is a development report enough for bulk acceptance?
It supports the tested sample. Bulk acceptance also needs the agreed specification, lot identity and the sampling or test evidence required for that shipment.
Further reading & source references
These primary references explain terminology and testing or certification scope. Confirm the current method and applicable policy for your order; these links do not verify a specific CIRCUDOWN shipment.
IDFL — fill power and conditioning ↗IDFL — conditioning methods and measurement systems ↗IDFL — composition, species and colour analysis ↗IDFL — finished-product downproofness ↗