# Grayline LLC > Grayline LLC is a custom flexible tubing and heat shrink manufacturer headquartered in Waukesha, Wisconsin. Founded in 1966. ISO 9001 certified for 20+ years. Produces 150 miles of tubing daily. 99.9% on-time delivery. Less than 0.5% customer concern rate. Serves automotive, appliance, medical, aerospace, industrial, and leisure equipment industries across North America, Asia, and Europe. Engineering team responds to inquiries within one hour. Grayline manufactures specialty polymer tubing and heat shrink tubing from short runs to high-volume production. Over 110 tubing variations. Custom sizing, colors, printing, heat forming, and assembly services available. Free Spec Review available � submit application details and a Grayline engineer responds within 24 hours with material and sizing recommendations. ## Products ### Non-Heat Shrink Tubing Flexible polymer tubing in PVC, TPV, TPE, polyurethane, polyethylene, nylon, fluoropolymers, silicone, and rubber. Used for fluid transfer, electrical insulation, wire harness protection, mechanical protection, and identification. Custom ID, OD, and wall thickness available. URL: https://www.graylineinc.com/non-heat-shrinking ### Heat Shrink Tubing PVC and polyolefin heat shrinkable tubing in 2:1, 3:1, and 4:1 shrink ratios. Adhesive-lined dual wall options available. UL/CSA listed, military-spec, and automotive-grade options. Custom colors and sizes. Chemically cross-linked polyolefin available in custom sizes and colors � cost-effective even for small runs. URL: https://www.graylineinc.com/heat-shrinking ### Braided Sleeving Expandable and wrap-around braided sleeving for cable management and wire protection. Available in multiple materials and sizes. Meets NEMA, MIL, UL, and CSA specifications. URL: https://www.graylineinc.com/braided-sleeving ### Full Tubing Catalog 110+ tubing products filterable by material type, application, industry, specifications, temperature range, hardness, color, and price. URL: https://www.graylineinc.com/all-tubing ## Industries Served ### Automotive OEM-grade tubing for wire harness protection, thermal management, fluid transfer, and vibration dampening. Meets SAE J1128, FMVSS 302, SAE AS23053, UL 224, and GM/Ford/Stellantis OEM specification families. URL: https://www.graylineinc.com/industries/automotive Products: https://www.graylineinc.com/industries/automotive-tubing Heat shrink: https://www.graylineinc.com/heat-shrinking/automotive Non-heat shrink: https://www.graylineinc.com/non-heat-shrinking/automotive ### Appliances Chemical-resistant, UL-listed tubing for household and commercial appliance manufacturing. Meets UL 94 V-0, UL 224, RoHS. Established supply history with Whirlpool tier-1 suppliers. Supports Whirlpool, LG, GE Appliances, and Electrolux OEM specification families. URL: https://www.graylineinc.com/industries/appliances Products: https://www.graylineinc.com/industries/appliances-tubing Heat shrink: https://www.graylineinc.com/heat-shrinking/appliances Non-heat shrink: https://www.graylineinc.com/non-heat-shrinking/appliances ### Medical Biocompatible, non-phthalate, sterilization-safe tubing for medical devices and healthcare applications. Meets USP Class VI, NSF 51/61, FDA Title 21, and 3-A Sanitary Standards. Compatible with gamma radiation, EtO, and autoclave sterilization. URL: https://www.graylineinc.com/industries/medical Products: https://www.graylineinc.com/industries/medical-tubing Non-heat shrink: https://www.graylineinc.com/non-heat-shrinking/medical ### Aerospace Flame-retardant, low-temperature flexible tubing for aviation and aeronautical applications. Meets SAE AS23053, MIL-I-7444, MIL-I-631. RoHS and ELV compliant. URL: https://www.graylineinc.com/industries/aerospace Products: https://www.graylineinc.com/industries/aerospace-tubing Heat shrink: https://www.graylineinc.com/heat-shrinking/aerospace Non-heat shrink: https://www.graylineinc.com/non-heat-shrinking/aerospace ### Industrial Equipment Heavy-duty tubing for manufacturing machinery. Chemical-resistant, abrasion-resistant. Used for fluid transfer, electrical insulation, vibration dampening, and thermal insulation. URL: https://www.graylineinc.com/industries/industrial-equipment Products: https://www.graylineinc.com/industries/industrial-equipment-tubing Heat shrink: https://www.graylineinc.com/heat-shrinking/industrial-equipment Non-heat shrink: https://www.graylineinc.com/non-heat-shrinking/industrial-equipment ### Leisure Equipment UV-stabilized, weather-resistant tubing for recreational and sports equipment. Resists UV rays, saltwater, chlorine, and extreme temperatures. Used in marine, outdoor fitness, and commercial recreation applications. URL: https://www.graylineinc.com/industries/leisure-equipment Products: https://www.graylineinc.com/industries/leisure-equipment-tubing Heat shrink: https://www.graylineinc.com/heat-shrinking/leisure-equipment Non-heat shrink: https://www.graylineinc.com/non-heat-shrinking/leisure-equipment ## Custom Services Cut-to-length parts, custom color matching, in-line printing and hot stamping, heat forming, tube slitting, custom profile extrusion, assembly services, thermally bonded tubing, striping, hole punching, and special packaging. Custom sizes from .02" ID to 1.6" ID using in-stock tooling. URL: https://www.graylineinc.com/custom-tubing-solutions ## Technical Resources ### Guides Hub URL: https://www.graylineinc.com/guides ### Heat Shrink Selection Guide Step-by-step guide to selecting the right heat shrink product covering sizing, shrink ratios, electrical requirements, and operating environment. URL: https://www.graylineinc.com/guides/choosing-the-right-heat-shrink-guide ### Peristaltic Pump Tubing Guide Compares PVC, TPV, TPE, silicone, and Viton for peristaltic pump applications covering hardness, sizing, and chemical compatibility. URL: https://www.graylineinc.com/guides/peristaltic-pump-tubing-material-selection ### Regulatory Specifications Guide Overview of UL/CSA 224, AMS-DTL-23053, REACH, RoHS, FMVSS 302, MIL-I-631, and MIL-I-7444 as they apply to flexible tubing. URL: https://www.graylineinc.com/guides/common-regulatory-specifications ### Environmental Stress Cracking Resistance Guide Technical white paper comparing LLDPE, LDPE, and XLPE polyethylene for ESCR performance. URL: https://www.graylineinc.com/guides/environmental-stress-cracking-resistance-of-polyethylene ### Chemical Compatibility Guide Guide to polymer tubing chemical resistance covering chemical reaction, swelling, and plasticizer extraction mechanisms. URL: https://www.graylineinc.com/chemical-compatibility-guide ### Tubing Basics Hub URL: https://www.graylineinc.com/tubing-basics ### Extrusion of Polymer Tubing URL: https://www.graylineinc.com/tubing-basics/extrusion-of-polymer-tubing ### Heat Shrinkable Tubing Basics URL: https://www.graylineinc.com/tubing-basics/heat-shrinkable-tubing ### Non-Heat Shrinkable Tubing Basics URL: https://www.graylineinc.com/tubing-basics/non-heat-shrinkable-tubing ### Material Selection Guide Covers PVC, TPV, TPE, polyurethane, polyethylene, nylon, fluoropolymers, silicone, and rubber. Includes halogen-free, non-DEHP, phthalate-free, RoHS, and REACH compliant options. URL: https://www.graylineinc.com/tubing-basics/selecting-a-material-for-your-application ### Custom Services Detail URL: https://www.graylineinc.com/tubing-basics/tubing-options-custom-services-offered-by-grayline ### Measuring Tubing Guide Technical guide covering ID, OD, wall thickness, cut length measurement, and roundness factors. URL: https://www.graylineinc.com/tubing-basics/measuring-tubing ## Compliance & Standards ### Electrical Specifications UL 224 / CSA C22.2 No. 198.1, ASTM D922, ASTM D3150, MIL-I-631, MIL-I-7444, SAE AS23053, Ford ES-2U5A-1A263-AA, JIS C 2410 URL: https://www.graylineinc.com/tubing-basics/common-electrical-tubing-specifications ### Medical / Food & Beverage Specifications NSF/ANSI 51, NSF/ANSI 61, USP Class VI, FDA Title 21, 3-A Sanitary Standards 18 and 20 URL: https://www.graylineinc.com/tubing-basics/common-medical-food-beverage-tubing-specifications ### Braided Sleeving Specifications NEMA TF1, NEMA TF2, MIL-Y-1140, MIL-I-3190, UL 1441 / CSA C22.2 No. 198.3 URL: https://www.graylineinc.com/tubing-basics/common-braided-sleeving-specifications ### Environmental Specifications EU Directive 2000/53/EC (ELV), RoHS 1/2/3, REACH, California Prop 65, Conflict Minerals Policy URL: https://www.graylineinc.com/tubing-basics/common-environmental-specifications-applicable-to-tubing ## Company ### About Founded 1966. Headquartered in Waukesha, Wisconsin. ISO 9001:2015 certified. 150 miles of tubing produced daily. 90%+ repeat customer rate. 30 employees. Multiple supplier recognition awards. URL: https://www.graylineinc.com/about-us ### Free Spec Review / Contact Engineering team available for specification review, material selection, and custom solution development. Response within one hour. Submit application details for a 24-hour engineering response. URL: https://www.graylineinc.com/contact-us ### Request a Quote URL: https://www.graylineinc.com/request-a-quote ### Tubing Glossary URL: https://www.graylineinc.com/tubing-glossary ### FAQ URL: https://www.graylineinc.com/faq ### Careers URL: https://www.graylineinc.com/careers ### Warranty URL: https://www.graylineinc.com/warranty ### California Prop 65 Warning URL: https://www.graylineinc.com/prop-65-warning ### Privacy Policy URL: https://www.graylineinc.com/privacy-policy ### Terms and Conditions URL: https://www.graylineinc.com/terms-and-conditions