What is PUL Fabric?
PUL stands for Polyurethane Laminate - a specialized fabric that combines a knit or woven textile base with a thin polyurethane coating. This creates a fabric that's waterproof, breathable, and flexible, making it perfect for projects that need moisture protection without bulk or stiffness.
How PUL Fabric Works
PUL fabric has two sides: a textile side (usually polyester knit) and a laminated side with a thin waterproof coating. The laminate prevents liquids from passing through while still allowing air circulation, which is why it's the gold standard for cloth diapers, wet bags, and medical applications.
Types of PUL Fabric
1 Mil PUL
Our White 1 mil PUL is the most common weight, offering excellent waterproofing in a lightweight, flexible fabric. The "mil" refers to the thickness of the polyurethane coating (1 mil = 0.001 inches).
Best for: Cloth diapers, diaper covers, wet bags, nursing pads, menstrual pads, light medical applications
2 Mil PUL
Thicker and more durable than 1 mil, 2 mil PUL offers enhanced waterproofing and longevity for heavy-duty applications.
Best for: Heavy-duty wet bags, mattress protectors, outdoor gear, pet accessories, industrial applications
Key Properties of PUL Fabric
| Property | Description |
|---|---|
| Waterproof | 100% liquid-proof when seams are sealed |
| Breathable | Allows air circulation to prevent moisture buildup |
| Flexible | Soft and pliable, not stiff like vinyl |
| Durable | Withstands repeated washing and use |
| Lightweight | Adds minimal bulk to projects |
| Easy Care | Machine washable and dryable (low heat) |
Best Projects for PUL Fabric
Baby & Childcare:
- Cloth diaper covers and all-in-one diapers
- Wet bags for diapers and soiled clothes
- Changing pad covers
- Bibs and burp cloths with waterproof backing
- Reusable swim diapers
- Potty training pants
Personal Care:
- Reusable menstrual pads and liners
- Nursing pads
- Incontinence products
- Cosmetic bags and toiletry pouches
Home & Lifestyle:
- Mattress protectors and pillow covers
- Reusable snack bags and lunch bags
- Waterproof pouches for electronics
- Beach bags and pool totes
- Pet bed liners and training pads
- Laundry bags for wet items
Outdoor & Active:
- Gym bag liners
- Wet swimsuit bags
- Waterproof stuff sacks
- Bike seat covers
How to Sew with PUL Fabric
Essential Supplies:
- Needle: Universal or microtex needle, size 70/10 or 80/12
- Thread: Polyester thread (stronger and more durable than cotton)
- Presser Foot: Teflon or walking foot (prevents sticking)
- Pins: Use clips instead of pins to avoid holes in the laminate
Sewing Tips & Techniques:
1. Identify the Right Side: The laminated (shiny or smooth) side is the waterproof side. This should face the moisture source in your finished project.
2. Use Clips, Not Pins: Pin holes compromise waterproofing. Use fabric clips or wonder clips to hold layers together.
3. Adjust Your Machine:
- Stitch length: 3.0-3.5mm (longer stitches = fewer holes)
- Reduce presser foot pressure to prevent stretching
- Use a Teflon or walking foot to prevent sticking
4. Seam Finishing: For maximum waterproofing, seal seams with:
- Bias tape or binding on raw edges
- Turned and topstitched seams
- Heat-activated seam tape (for critical waterproof seams)
5. Avoid Excessive Handling: The laminate can separate from the base fabric if over-handled or stretched during sewing.
6. Test First: Always test your settings on scraps before starting your project.
Common Mistakes to Avoid
- Using pins: Creates permanent holes that leak
- Too-short stitch length: More holes = more potential for leaking
- High heat: Can melt or damage the laminate
- Ripping out stitches repeatedly: Weakens the fabric
- Wrong side facing out: The laminated side must face the moisture
- Stretching while sewing: Can cause the laminate to separate
Care Instructions for PUL Fabric
Washing:
- Machine wash warm or cold (not hot)
- Use gentle, PUL-safe detergent (avoid fabric softeners and bleach)
- Wash with similar items to prevent abrasion
Drying:
- Tumble dry LOW heat only (high heat damages laminate)
- Line drying is gentlest and extends fabric life
- Avoid direct sunlight for extended periods
Storage:
- Store flat or loosely folded
- Avoid creasing the same spot repeatedly
- Keep away from heat sources
Troubleshooting PUL Sewing Issues
Problem: Fabric sticks to presser foot
Solution: Use a Teflon foot, walking foot, or place tissue paper between fabric and foot (tear away after sewing)
Problem: Skipped stitches
Solution: Use a fresh needle, reduce speed, and ensure proper needle type (universal or microtex)
Problem: Fabric stretches while sewing
Solution: Reduce presser foot pressure, use a walking foot, and don't pull fabric through the machine
Problem: Laminate separating from base
Solution: Handle gently, avoid excessive heat, and don't over-stretch during sewing
PUL vs Other Waterproof Fabrics
PUL vs TPU: TPU (Thermoplastic Polyurethane) is similar to PUL but more eco-friendly and heat-resistant. Both work for similar projects.
PUL vs Vinyl: Vinyl is stiffer, less breathable, and not suitable for items worn against skin. PUL is softer and breathable.
PUL vs Waxed Canvas: Waxed canvas is water-resistant (not waterproof), heavier, and better for bags than body-worn items.
Frequently Asked Questions
Q: How long does PUL fabric last?
A: With proper care, PUL can last 2-3 years of regular use. Cloth diapers made with quality PUL often last through multiple children.
Q: Can I iron PUL fabric?
A: No! Heat damages the laminate. If you must press seams, use the lowest setting and a pressing cloth, or finger-press only.
Q: Is PUL safe for babies?
A: Yes. Quality PUL is tested and certified safe for baby products. Our 1 mil PUL meets safety standards for cloth diapers.
Q: Can I use PUL for outdoor rain gear?
A: PUL works for light rain protection but isn't as durable as technical outdoor fabrics for heavy-duty rain gear.
Q: Why is my PUL leaking?
A: Check for pin holes, ensure the laminated side faces the moisture source, and verify seams are properly finished.
Ready to start your first PUL project? Shop our White 1 mil PUL fabric and create durable, waterproof items that last!