Third-Party Testing and Verification
The Sierra Dreams Bedding Integrity Resource Center publishes third-party laboratory testing that independently verifies the material and performance claims described throughout this framework.
|
Category |
Result |
|
Fiber Content |
100% Verified |
|
Lead |
Not Detected |
|
Cadmium |
Not Detected |
|
Phthalates |
Not Detected |
|
Formaldehyde |
Not Detected |
|
Dimensional Stability |
1-3% shrinkage |
|
Abrasion Resistance |
20,000 rubs NTBO |
Sierra Dreams submits materials and finished products to independent third-party laboratories for testing. This page documents the results of those tests, conducted by SGS, one of the largest and most recognized inspection, verification, testing, and certification companies in the world.
These test results substantiate the claims made throughout the Bedding Integrity Resource Center, including material composition, colorfastness, dimensional stability, chemical safety, and the mechanical performance of the Align snap system.
About SGS Testing
SGS SA is a multinational company headquartered in Geneva, Switzerland. SGS operates more than 2,600 offices and laboratories worldwide and is recognized as the global benchmark for sustainability, quality, and integrity. SGS testing follows ISO and ASTM international standards.
All tests documented here were conducted at the SGS India Pvt. Ltd. Connectivity and Products Testing Laboratory in Chennai, India.
Organic Cotton Sateen: Colorfastness Testing
Report Number: CH:TX:1542036483
Issue Date: August 12, 2024 View full SGS report (PDF)
Sample: 300 TC Satin, Woven Fabric, 100% Cotton (Organic), Warm White
End Use: Pillowcase, Flat Sheet, Duvet Cover
Test Standard: ISO 105 C06:2010 (Washing), ISO 105X12:2016 (Rubbing)
Colorfastness to Washing (ISO 105 C06:2010 A2S)
Tested at 40 degrees C with ECE Phosphate Detergent, 10 steel balls, 30 minutes.
|
Test Parameter |
Rating |
|
Colour Change |
4-5 |
|
Staining on Acetate |
4-5 |
|
Staining on Cotton |
4-5 |
|
Staining on Nylon |
4-5 |
|
Staining on Polyester |
4-5 |
|
Staining on Acrylic |
4-5 |
|
Staining on Wool |
4-5 |
Grey Scale Rating: 1 (poor) to 5 (excellent). Industry standard minimum is typically 3-4 for retail textiles.
Colorfastness to Rubbing (ISO 105X12:2016)
|
Condition |
Dry |
Wet |
|
Original State |
4-5 |
4-5 |
|
After Wash |
4-5 |
4-5 |
After-wash testing followed ISO 6330:2021 (Machine Wash 40 degrees C, Gentle Cycle, Tumble Dry Medium).
European Linen: Comprehensive Product Testing
Report Number: CHNSL250037140-A and CHNSL250037140-B
Issue Date: August 22-23, 2025 View full SGS report (PDF)
Sample: 100% Linen Sheet Set (Flat Sheet, Fitted Sheet, Pillow Cases), Slate
End Use: Duvet Cover, Fitted Sheet, Flat Sheet, Pillow Cases
Buyer: Sierra Dreams
Total Test Parameters: 28
Colorfastness Results
|
Test |
Rating |
|
Crocking, Dry (AATCC TM8) |
4.5 |
|
Crocking, Wet (AATCC TM8) |
3.5 |
|
Washing (AATCC TM61, 40 degrees C) |
4 (shade change) |
|
Washing, Staining on Multi-Fibre |
4.5 (all fibers) |
|
Water (AATCC TM107) |
4.5 (shade and staining) |
|
Perspiration, Acidic (AATCC TM15) |
4.5 (shade change) |
|
Light, Xenon-Arc (AATCC 16.3, 20 AFU) |
3 |
|
Non-Chlorine Bleach (AATCC-ASTM TS001) |
4 (powder and liquid) |
Grey Scale Rating: 1 (poor) to 5 (excellent). Industry standard minimum is typically 3-4 for retail textiles.
Note: A rating of 3 for lightfastness is typical for natural linen in darker colors. Linen naturally softens and lightens with sun exposure over time, which is a characteristic of the fiber, not a defect.
Fiber Content Verification (AATCC TM 20:2021)
All three components tested verified as 100% Linen: Flat Sheet, Fitted Sheet, and Pillow Case.
Dimensional Stability After 3 Washes (AATCC TM 150)
Tested per AATCC TM 150-2018 (Machine Wash 30 degrees C, Gentle Cycle, Tumble Dry Low, Cool Iron).
|
Component |
Original |
After 3 Washes |
Change |
|
Flat Sheet |
|
|
|
|
Length |
244.0 cm |
240.0 cm |
-1.6% |
|
Width |
231.0 cm |
229.0 cm |
-0.9% |
|
Fitted Sheet |
|
|
|
|
Length |
211.0 cm |
208.0 cm |
-1.4% |
|
Width |
160.0 cm |
158.0 cm |
-1.3% |
|
Pocket Depth |
42.0 cm |
41.4 cm |
-1.4% |
|
Pillow Case |
|
|
|
|
Length |
51.0 cm |
50.0 cm |
-2.0% |
|
Width |
67.0 cm |
65.0 cm |
-3.0% |
Shrinkage in the 1-3% range is normal for natural linen. Sierra Dreams accounts for this by cutting fabric with shrinkage tolerances built into the pattern.
Structural Performance
|
Test |
Result |
|
Tear Strength, Length (ASTM D1424) |
11.1 lbf |
|
Tear Strength, Width (ASTM D1424) |
9.3 lbf |
|
Tensile Strength, Length (ASTM D5034) |
53.0 lbf |
|
Tensile Strength, Width (ASTM D5034) |
52.0 lbf |
|
Abrasion Resistance, 20,000 Rubs (ASTM D4966) |
NTBO, Shade Change 3.5 |
|
Pilling Resistance, 1,000 Rubs (ASTM D4970) |
Rating 3 (Moderate) |
|
Seam Slippage, Fitted Sheet Corner (ASTM D1683) |
15.8 lbf |
|
Seam Slippage, Pillow Case Side (ASTM D1683) |
11.8 lbf |
|
Seam Strength, Fitted Sheet Corner (ASTM D1683) |
27.6 lbf |
|
Seam Strength, Pillow Case Side (ASTM D1683) |
30.5 lbf |
NTBO: No Thread Break Observed. The fabric withstood 20,000 abrasion cycles without thread failure.
Fabric Specifications
|
Parameter |
Value |
|
Thread Count, Length (ASTM D3775) |
48 per inch |
|
Thread Count, Width (ASTM D3775) |
43 per inch |
|
Weight (ASTM D3776) |
162 g/m2 (4.8 oz/yd2) |
|
pH Value (AATCC 81) |
6.0 - 6.8 |
Align System Hardware Testing
The linen test report includes testing of the Align snap system components, verifying mechanical performance of the stud-socket connection and zipper hardware.
Attachment Strength (ASTM D7142): Measures the force required to pull a fastener from the fabric.
|
Component |
Load Range (lbf) |
Failure Mode |
|
Flat Sheet Studs (11mm) |
10.5 - 18.5 |
Stud breaks (fabric intact) |
|
Fitted Sheet Sockets (13mm) |
18.6 - 24.1 |
Socket breaks (fabric intact) |
|
Pillow Case Zipper |
31.9 |
Puller breaks |
In all cases, the hardware component failed before the fabric. This confirms that the linen construction is stronger than the fastener rated load, meaning the fabric will not tear at attachment points during normal use.
Snap and Unsnap Force (ASTM D4846): Measures the force needed to connect and disconnect the Align snap system.
|
Action |
Force Range (lbf) |
|
Snapping (connecting flat sheet to fitted sheet) |
3.2 - 3.8 |
|
Unsnapping (disconnecting) |
4.5 - 4.9 |
The unsnap force is consistently higher than the snap force. This means the system is designed to hold securely during sleep movement while still being easy to connect when making the bed.
Appearance After Washing
SGS tested the complete linen sheet set through wash cycles (Machine Wash, 30 degrees C, Gentle Cycle, Tumble Dry Low, Cool Iron) and observed the following across all three components (flat sheet, fitted sheet, pillow case):
• Slight colour change observed (Grade 4)
• No noticeable pilling or fuzziness (Rating 4.5)
• Surface smoothness by hand feel remains same as original after washing
• No fraying of threads from seams
• No noticeable seam puckering
• No damage or detachment of studs, sockets, or zippers
• Labels securely attached
Chemical Safety (California Proposition 65 Compliance)
All chemical safety tests were performed with reference to CPSC and Prop 65 standards.
|
Substance |
Result |
Conclusion |
|
Lead in Substrate (CPSC-CH-E1002-08.3) |
Not Detected |
PASS |
|
Lead in Surface Coating (CPSC-CH-E1003-08.3) |
Not Detected |
PASS |
|
Total Cadmium (CPSC-CH-E1002-08.3) |
Not Detected |
PASS |
|
Cadmium in Surface Coating (CPSC-CH-E1003-08.3) |
Not Detected |
PASS |
|
Phthalates, 6 compounds (CPSC-CH-C1001-09.4) |
Not Detected |
PASS |
|
Formaldehyde (EN ISO 14184-1:2011) |
Not Detected |
PASS |
Zero detectable levels across all six substance categories. This includes all hardware components (snap studs, sockets, zipper puller, zipper teeth, and zipper runner) in addition to the textile materials.
Flammability
The linen fabric is exempt from flammability testing under 16 CFR Part 1610-2023 because its weight (4.8 oz/yd2) exceeds the 2.6 oz/yd2 threshold for plain surface fabrics. Heavier fabrics inherently resist ignition, so the regulation does not require additional flame testing.
Components Tested
The linen report tested seven distinct material components of the finished product:
|
Component |
Material |
Color |
|
Flat Sheet, Base Fabric |
Textile (Linen) |
Slate |
|
Flat Sheet, Twill Tape |
Textile |
Slate |
|
Snap Button, Stud |
Plastic |
Grey |
|
Snap Button, Socket |
Plastic |
Grey |
|
Zipper Puller |
Coating Material |
Black |
|
Zipper Teeth |
Plastic |
Black |
|
Zipper Puller/Runner |
Metal |
Black |
What These Results Mean
Third-party testing by an accredited laboratory provides independent verification that is separate from Sierra Dreams internal quality checks. The key takeaways from these reports:
Material purity is verified. Fiber content analysis confirmed 100% linen across all pieces. The organic cotton sateen fabric was submitted and identified as 100% Cotton (Organic).
Chemical safety is confirmed. Zero detectable levels of lead, cadmium, phthalates, and formaldehyde across all textile and hardware components.
The Align snap system is mechanically sound. Hardware attachment testing shows the fabric is stronger than the fasteners. The snap force is calibrated for easy connection while the unsnap force is higher for secure hold during sleep.
The product holds up through washing. Post-wash evaluation showed no damage to hardware, no seam failure, and maintained surface quality.
Related Resources
Bedding Integrity Framework: The nine-pillar evaluation system that these test results substantiate.
Certifications Explained: Information on GOTS, OCS, OEKO-TEX, and RDS certifications.
Align System Technical Overview: Engineering specifications for the snap-based bedding system tested in the linen report.
Materials Comparison Matrix: How the tested materials compare to conventional bedding alternatives.
FAQs
How long should quality sheets last?
High-quality sheets made from long-staple cotton or linen typically last 5–10 years with proper care, depending on wash frequency, water temperature, and drying method. Durability indicators tested in standardized laboratory conditions include tensile strength (ASTM D5034), abrasion resistance (ASTM D4966), and colorfastness to washing (ISO 105 C06). Sheets that perform well on these metrics in pre-sale testing are more likely to maintain integrity through years of use.
Do linen sheets shrink after washing?
Yes. Natural linen shrinks 1–3% during initial washes. SGS dimensional stability testing (AATCC TM 150) on Sierra Dreams linen after three wash cycles at 30°C showed: flat sheet length −1.6%, flat sheet width −0.9%, fitted sheet −1.3 to −1.4%, pillow case −2.0 to −3.0%. This is within the normal range for natural linen. Sierra Dreams accounts for this by building shrinkage tolerances into the cutting pattern before sewing.
Why do my sheets feel damp in the morning?
Morning dampness in sheets occurs when moisture vapor from the body accumulates in bedding layers faster than it can evaporate through the fabric. Fabrics with low MVTR (Moisture Vapor Transmission Rate) slow the escape of humidity from the sleep microclimate. This is distinct from visible sweating — the accumulation can be gradual and imperceptible during sleep, becoming noticeable upon waking.
What is seam slippage in bedding?
Seam slippage is a failure mode where fabric threads pull apart at a sewn seam under tension, without the thread itself breaking. It is tested under ASTM D1683 by applying force perpendicular to the seam. SGS testing of Sierra Dreams linen measured seam slippage resistance at 15.8 lbf (fitted sheet corner) and 11.8 lbf (pillow case side). Higher values indicate more durable seam construction.
How do labs test sheet durability?
Textile laboratories evaluate bedding durability using a range of standardized tests:
- Tensile strength (ASTM D5034) — force required to break the fabric
- Tear strength (ASTM D1424) — force required to propagate an existing tear
- Abrasion resistance (ASTM D4966) — fabric condition after thousands of rub cycles
- Pilling resistance (ASTM D4970) — surface fiber behavior under friction
- Shrinkage testing (AATCC TM 150) — dimensional change after washing
- Seam strength and slippage (ASTM D1683) — seam integrity under load.
What bedding materials last the longest?
Among natural bedding materials, linen and long-staple cotton demonstrate the highest durability in repeated wash testing. Linen fiber (flax) has inherently high tensile strength; Sierra Dreams linen tested at 53.0 lbf (ASTM D5034). Long-staple cotton resists pilling due to longer fiber overlap. Both materials tend to soften rather than degrade with repeated washing, unlike synthetic fabrics that break down at the fiber level.
How often should you replace bedding?
Most sleep and textile experts recommend replacing sheets every 5–7 years under normal use — weekly washing, tumble dry low. The practical indicator is fabric thinning, persistent staining, or loss of dimensional stability (sheets no longer hold their shape on the mattress). Higher-quality fabrics made from long-staple cotton or linen typically reach the upper end of this range or beyond.