Rubber insulating blankets provide essential phase-to-phase and phase-to-ground protection for utility workers and electricians working near energized conductors, apparatus, or structural elements. Because blankets are routinely draped, clamped, and handled in rugged field conditions, regular laboratory testing is critical to verify their dielectric strength and physical integrity.
Burlington Safety Laboratory offers complete, ASTM-compliant testing services for electrical insulating blankets across our state-of-the-art testing facilities in New Jersey and California. With our standard 2-week turnaround time (and expedited options available), we keep your utility crews, line contractors, and industrial safety teams fully compliant and protected.
Why Choose Burlington Safety Lab for Rubber Blanket Testing?
- NAIL for PET Accredited: Certified independent laboratory testing since 1971.
- Full ASTM / OSHA Compliance: Tested strictly to ASTM D1048 and F479 standards.
- Seamless Replacement Program: New product inventory ready to replace failed blankets immediately.
- Complete Traceability: Detailed test documentation, ink date stamping, and serialized record-keeping provided with every order.
Insulating Blanket Compliance & Testing Specifications
To comply with OSHA 1910.137 and NFPA 70E, rubber insulating blankets must undergo dielectric laboratory retesting every 12 months (or sooner if visual inspection indicates potential damage).
Spec Feature | Standard Specification Details |
|---|---|
Applicable Standards | ASTM D1048 (Manufacturing) & ASTM F479 (In-Service Care/Testing) |
Blanket Classes Tested | Class 0 (1,000V) through Class 4 (36,000V) — Slotted & Solid |
Required Test Frequency | Every 12 months (In-Service) / 12 months (Unissued/Stored) |
Accreditation | NAIL for PET (North American Independent Laboratories for Protective Equipment Testing) |
Turnaround Time | Standard 2-Week Turnaround (Expedited Services Available) |
Our Step-by-Step Dielectric Testing Process for Insulating Safety Blankets
Every insulating blanket submitted to Burlington Safety Laboratory passes through a rigorous quality assurance workflow:
Step 1: Preparatory Cleaning & Washing
Blankets undergo thorough washing using mild detergents to remove dirt, grease, oils, chemicals, and road grime that can compromise dielectric properties. Old test stamps and ink markings are removed to ensure a clean surface for evaluation and restamping.
Step 2: Machine Drying
Following the washing phase, blankets are placed in warm-air drying equipment to eliminate surface moisture prior to high-voltage electrical testing.
Step 3: Dielectric High-Voltage Testing
Blankets are positioned on precision flat-bed testing electrodes and subjected to high-voltage dielectric testing in strict adherence to ASTM standards. Our advanced equipment simultaneously evaluates electrical insulation properties and measures leakage current across all blanket classes (Class 0 through Class 4). Any detected electrical breakdown or current leakage beyond allowed limits is automatically flagged.
Step 4: Re-Drying Process
After dielectric testing, blankets undergo a secondary drying pass to prepare the rubber surface for physical visual inspection.
Step 5: Visual Inspection & Physical Evaluation
Skilled technicians inspect every square inch of the blanket under proper lighting and tension. Technicians manually roll and flex both sides of the blanket to detect physical defects, including:
- Corona cutting, ozone cracking, and UV damage
- Cuts, nicks, punctures, tears, and scratches
- Foreign material inclusion, chemical attack, or surface deep depressions
Step 6: Serialized Stamping
Blankets passing dielectric and visual inspections are stamped in durable ink with a unique serial number, proof test voltage, maximum use voltage, and test date to ensure complete accountability and audit traceability.
Step 7: Packaging & Protection
Certified blankets are carefully rolled or stored flat using protective wrap to guard against dust, ozone, and mechanical abrasion during handling.
Step 8: Boxing & Labeling
Blankets are packaged into sturdy cartons and sealed with Burlington Safety tape. Each box is labeled with individualized stickers containing serial numbers, test dates, and relevant blanket specifications.
Step 9: Shipping or Pickup
Sealed orders are dispatched via UPS or made available for customer pickup at one of our regional facilities (Burlington, NJ; Pleasanton, CA; Westminster, CA).
Safety Blanket Field Care & Inspection (In the Field Guidelines)
Proper daily handling extends the service life of rubber insulating blankets and ensures maximum safety between required annual laboratory tests:
ALWAYS:
NEVER:
Immediate Replacement for Failed Blankets
If a blanket fails dielectric testing or physical inspection, safety standards dictate that it must be retired immediately.
Burlington Safety Laboratory carries a complete inventory of new, freshly tested Class 0 through Class 4 insulating blankets (solid, slotted, eyelet, and roll blanketing) from top manufacturers. We can instantly replace rejected units from stock to prevent operational delays on your job site.
Ready to Recertify Your Safety Blankets?
Ensure your line workers stay protected and fully compliant with OSHA and ASTM guidelines.