About L&L

Used L&L Furnaces for Sale

Resell CNC is your Simple. Reliable. and Trusted.® source for used L&L Special Furnace heat treating equipment — including box furnaces, floor-standing furnaces, dual-chamber heat treating and tempering furnaces, car bottom furnaces, shuttle furnaces, bottom-loading high-temperature furnaces, retort furnaces, quench tanks, furnace loaders, and tempering ovens. We carry L&L products across the full range, from benchtop CB-Series box furnaces through large XLE and XLG floor-standing models, QDS dual-chamber systems, and complete heat treating lines with integrated quench tanks.

L&L Special Furnace traces its origins to 1946, when the company was founded as L&L Manufacturing Company in Chester, Pennsylvania. The founders began building electric kilns for hobbyists before expanding into industrial heat treating furnaces and ovens. The industrial division became L&L Special Furnace Company in the 1960s and relocated to a dedicated facility in Aston, Pennsylvania, in 1979. For over seven decades, L&L has manufactured precision heat treating equipment for the industrial and laboratory world. In January 2023, the company's assets were acquired by Specialized Thermal Solutions, Inc., with operations continuing under the L&L Special Furnace name. All engineering and manufacturing remain in-house at the company's Aston facility south of Philadelphia. L&L specializes in batch production furnaces and ovens with applications requiring high uniformity, controlled atmosphere, and precise temperature control, serving aerospace, defense, medical device, investment casting, tool and die, advanced ceramics, and general manufacturing industries.

Looking to sell your L&L furnace? Resell CNC buys used L&L heat treating equipment nationwide, covering any model, any configuration, and any condition. Free appraisal within 24 hours, competitive offers, and we handle all rigging and transportation. Call (844) 478-8181 or email sales@resellcnc.com.

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L&L Box Furnaces & Floor-Standing Models

L&L's core product line consists of electric box furnaces ranging from compact benchtop units for small parts and laboratory work through large floor-standing models for production heat treating. The CB-Series provides benchtop capability for shops getting started in heat treating. The XLE-Series and XLG-Series floor-standing box furnaces handle larger work zones for production-scale annealing, hardening, tempering, and stress relieving. All box furnaces feature precision Eurotherm controllers with overtemperature protection. High-temperature models use molybdenum-disilicide (MoSi2) heating elements for applications above standard resistance element limits.

L&L Dual-Chamber, Retort & Specialty Furnaces

The QDS dual-chamber furnace combines a high-temperature heat treating chamber (rated to 2,350°F) with a lower-temperature tempering chamber (rated to 1,250°F) equipped with recirculation fan and baffle, providing two thermal processes in a single unit. Retort box furnaces enable controlled-atmosphere processing including hydrogen brazing, sintering, and inert-gas heat treating. Car bottom and shuttle furnaces handle large or heavy workpieces. Bottom-loading furnaces serve high-temperature applications where top-entry loading is required.

L&L Quench Tanks & Accessories

L&L quench tanks provide rapid cooling for hardening operations, with options for load elevators, agitation systems, and integrated cooling. Furnace loaders automate the transfer of workpieces between furnaces and quench tanks. Manual flowmeter and regulator systems enable inert-atmosphere operation. Complete heat treating lines combine L&L furnaces, quench tanks, and loaders into integrated systems.


Founded	1946 (Chester, PA; Aston, PA since 1979)
Headquarters	Aston, Pennsylvania, USA
Current Owner	Specialized Thermal Solutions, Inc. (acquired January 2023)
Best Known For	High-uniformity box furnaces, heat treating systems, quench tanks
Popular Models	CB-Series, XLE-Series, XLG-Series, QDS dual-chamber, GS-Series, FB-Series
Temperature Controls	Eurotherm controllers with overtemperature protection
Industries Served	Aerospace, defense, medical, investment casting, tool & die, ceramics, manufacturing

What to Look for When Buying a Used L&L Furnace

L&L Special Furnace equipment is built in the USA with precision temperature control, high-uniformity heating, and durable construction designed for continuous industrial service. Here is what to inspect on used units.

Inspect the heating elements and insulation. Check resistance heating elements (Kanthal, nickel-chrome, or MoSi2 depending on temperature rating) for visible damage, sagging, or broken sections. Inspect refractory insulation for cracking or deterioration. Element replacement is the most common service item on used furnaces.

Test the temperature controller and safety systems. L&L furnaces use Eurotherm controllers with overtemperature protection. Verify the controller reads accurately, accepts setpoints, and ramps at the expected rate. Test the overtemperature safety cutoff and all door interlocks.

Verify temperature uniformity. For heat treating applications, temperature uniformity across the work zone is critical. Request the most recent temperature uniformity survey (TUS) if available. On aerospace and defense applications, furnaces must meet AMS 2750 uniformity requirements. Run a soak test with multiple thermocouples positioned throughout the work zone to verify that the furnace maintains specification.

Check the chamber, door, and structural condition. Inspect the furnace chamber for hot spots, discoloration patterns, or localized element failure. Check the door seal for gaps or compression loss. On retort models, verify retort integrity and atmosphere sealing.

L&L CB-Series & Benchtop Furnaces

The CB-Series benchtop box furnaces provide compact heat treating capability for small parts, laboratory samples, and prototype work. CB-Series models are commonly traded on the used market by shops upgrading to larger floor-standing units.

L&L XLE & XLG Floor-Standing Box Furnaces

The XLE-Series floor-standing box furnaces are L&L's production workhorse, with work zones ranging from modest benchtop-replacement sizes through large chambers for production heat treating. The XLE3436, for example, provides a 34-inch wide by 22-inch high by 32-inch deep work zone with a direct-lift vertical door. The XLG-Series extends to larger chambers and higher temperatures. Both series feature Eurotherm controls, overtemperature protection, and options for atmosphere sealing, recirculation fans, and custom work zone configurations.

L&L QDS Dual-Chamber & GS/FB Series

The QDS dual-chamber furnace combines a high-temperature heat treating chamber (rated to 2,350°F) with a tempering chamber (rated to 1,250°F with recirculation fan and baffle) in a single unit, supporting two-step heat treating processes without transferring parts between separate machines. The GS-Series (such as the GS1714 and GS2026) serves specialized applications including chemical curing and medical device manufacturing. The FB-Series floor-standing box furnaces handle ceramics, optics, and aerospace component heat treating.

L&L Retort Furnaces, Quench Tanks & Loaders

Retort box furnaces enable controlled-atmosphere heat treating by enclosing the work zone in a sealed retort that can be purged with hydrogen, nitrogen, argon, or other process gases. Applications include hydrogen brazing, powder metal sintering, and bright annealing of stainless steel. Quench tanks with load elevators and cooling systems provide rapid quenching immediately after heat treatment. Furnace loaders automate workpiece transfer between the furnace and quench tank for consistent timing and reduced operator exposure to hot parts.

How to Sell Your Used L&L

L&L furnaces hold solid resale value thanks to American-made construction, Eurotherm controls, high uniformity specifications, and consistent demand from manufacturers adding or upgrading heat treating capability. XLE floor-standing box furnaces, QDS dual-chamber systems, and retort furnaces are in particularly high demand.

Resell CNC buys used L&L furnaces, every model and configuration, nationwide.

Contact us — call (844) 478-8181 or email sales@resellcnc.com.
Free appraisal within 24 hours, no obligation.
Accept the offer — we handle rigging, transport, and logistics.

Frequently Asked Questions About Used L&L Furnaces

Are used L&L furnaces reliable?

Yes. L&L Special Furnace has manufactured industrial heat treating equipment in the USA since 1946. The company's furnaces are built with high-quality insulation, durable heating elements, and Eurotherm precision controllers. Used L&L furnaces with intact elements and verified temperature uniformity continue to deliver reliable performance for production heat treating.

What is the relationship between L&L Special Furnace and L&L Kiln?

L&L Special Furnace Co. and L&L Kiln Mfg., Inc. share common origins but have operated as separate companies since 2012. L&L Special Furnace (Aston, PA) builds industrial furnaces, ovens, and heat treating systems. L&L Kiln Mfg. (Swedesboro, NJ) builds pottery and ceramic kilns. In 2023, L&L Special Furnace was acquired by Specialized Thermal Solutions, Inc.

What should I inspect before buying a used L&L furnace?

Check heating elements for damage and measure resistance. Test the Eurotherm controller and overtemperature safety. Verify temperature uniformity with a multi-point thermocouple test. Inspect chamber insulation, door seals, and structural condition. On retort models, verify atmosphere sealing integrity.

What heat treating processes can L&L furnaces perform?

L&L furnaces handle hardening, tempering, annealing, stress relieving, solution heat treating (aluminum), precipitation hardening, hydrogen brazing, sintering, bright annealing, and ceramics processing. Atmosphere options include air, nitrogen, argon, hydrogen, and forming gas.

What L&L products hold their value best?

XLE floor-standing box furnaces and QDS dual-chamber systems maintain the strongest resale values due to production capability and versatility. Retort furnaces with atmosphere control command premiums. Call (844) 478-8181 for current valuations.

Does Resell CNC offer financing on used L&L furnaces?

Yes. Resell CNC offers flexible financing options to help your business acquire the equipment it needs. Contact us at (844) 478-8181 to discuss terms.

How do I sell my used L&L furnace?

Contact Resell CNC at (844) 478-8181 or sales@resellcnc.com. We buy all L&L Special Furnace products nationwide, from benchtop box furnaces through complete heat treating systems with quench tanks and loaders. Free appraisal within 24 hours.