Description
Rubber Top Chain — 12B-G2
12B-G2 rubber top chain widens the rubber contact zone to the full outer link plate width on the ISO 12B pitch base — giving large-format panels, wide glass sheets, and oversized tile formats the broad support they require for stable conveying at production speeds.
Product Overview
In wood panel and glass production facilities, sheet and panel sizes have grown steadily as manufacturing equipment has scaled up. A 3,000mm × 1,500mm MDF panel resting on a narrow G1 rubber contact surface experiences higher unit contact pressure than the same panel resting on a wider G2 surface — and higher unit pressure increases the risk of surface marking, particularly on heat-sensitised lacquered surfaces just exiting a press or laminating machine. The G2 profile’s wider rubber pad distributes the panel weight across a larger surface area, keeping contact pressure below the marking threshold even for the heaviest and largest panel formats.
The same principle applies in flat glass conveying: large glass lite sizes — architectural curtain wall glass at 2,000mm × 4,000mm and beyond — require the broader support footprint of the G2 profile to prevent the flexural stress at the chain contact points that leads to glass edge chipping in thin glass formats. The G2 profile also provides improved lateral stability for tall, narrow glass panels that would tip on the narrower G1 contact base.
12B-G2 — G2 wide rubber top on ISO 12B-1 base
Specification — 12B-G2
| Chain No. |
Pitch P (mm) |
Roller Ø (mm) |
Inner Width (mm) |
Pin Ø (mm) |
Pin Length (mm) |
Plate Depth (mm) |
Rubber W (mm) |
Rubber H (mm) |
Overall W (mm) |
Q min (kN) |
Weight (kg/m) |
| 12B-G2 |
19.050 |
12.07 |
11.68 |
5.72 |
22.50 |
16.13 |
52.0 |
12.0 |
60.0 |
29.0 |
1.28 |
Rubber top chain in production conveyor environment
Rubber Profile and Material Properties
12B-G2 chains use the same vulcanised rubber compounds as the G1 series — NBR/SBR 60–80 Shore A in standard specification, silicone for elevated temperatures, and food-grade NBR with H1 lubrication for food-adjacent applications. The wider G2 profile provides a larger rubber-to-steel bonding area, which improves delamination resistance relative to G1 when the wider rubber surface experiences lateral product scrubbing forces during accumulation and diverting. In wood panel plants where panels are pushed laterally off the main conveyor onto side conveyors or stacking tables, this improved delamination resistance is a practical advantage that extends the rubber profile service life by 20–30% compared to narrower G1 profiles under the same lateral force conditions.
Core Performance Advantages
🤚
Positive Non-Slip Grip
The vulcanised rubber surface grips product bases firmly at conveyor accelerations and on inclined sections where smooth-surface chains allow slippage — eliminating the positioning errors and product damage that result from uncontrolled sliding.
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Measurable Noise Reduction
Rubber’s damping properties absorb the micro-impacts at each sprocket link engagement, reducing conveyor operating noise at the product contact surface. In facilities with noise regulations, this can be a compliance factor.
🛡️
Surface-Safe Product Handling
Direct contact between bare steel chain and finished product surfaces causes scratching, denting, and marking. The rubber layer completely eliminates steel-to-product contact, maintaining surface integrity through the full conveyor run.
⚙️
Standard Sprocket Compatibility
The base chain dimensions are fully standard — the same sprockets used for the equivalent standard roller chain work without modification for the rubber top version. No hardware changes required for retrofitting.
Application Areas
Industrial conveyor application for 12B-G2
🔲
Large-Format Panel Production
MDF, particleboard, and plywood panels in 2440mm × 1220mm and larger formats require the G2 profile’s wider contact for stable conveying without rocking or contact marking at panel edges.
🪟
Architectural Glass Handling
Large architectural glass lites for curtain walls and structural glazing are conveyed on G2 chains. The wider rubber support reduces flexural stress at contact points on thin glass formats.
🏺
Large Ceramic and Stone Tiles
600mm × 600mm and 800mm × 800mm large-format porcelain and stone tiles require stable, marking-free support through kiln outfeed and sorting — G2’s wider base suits these formats better than G1.
📋
Composite and Cementboard Panels
Fibre cement, GRC, and composite panels with heavy weight-per-unit-area need the wider load distribution of G2 to prevent rubber deformation that would create uneven conveying speed and panel surface marking.
Rubber top chain on production line
Related Components We Supply
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Matched Sprockets — ISO 12B-1
Standard sprockets in the pitch matching 12B-G2. No special tooth form needed — standard ISO 12B-1 sprockets engage rubber top chains correctly at the roller-to-tooth interface.
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Rubber Top Connecting Links
Connecting links with matching rubber top profile for a smooth, uninterrupted conveying surface at the chain join point.
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Replacement Rubber Top Outer Link Sets
Individual outer link plate assemblies with vulcanised rubber profiles for field repair of worn sections without replacing the full chain.
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UHMWPE Guide Rails
Low-friction polyethylene guide profiles reducing lateral wear on rubber edges in side-guided conveyor configurations.
Customer Reviews
★★★★★
“We switched from 12B-G1 to 12B-G2 on our main panel conveyor after surface marking complaints on our 3050mm panels at the press exit. G2 eliminated marking completely — the wider rubber area keeps contact pressure below our marking threshold even on the heaviest panels we run. Service life is good and the batch quality is consistent.”
S
Stefan Müller
Conveyor Engineer — Berlin MDF Plant
★★★★★
“Specified 12B-G2 for our large-format glass cutting conveyor handling 2400 × 1500mm lites. The G2 wider support is essential for these sizes — the G1 we had previously left contact impressions on thin glass during accumulation. No marking issues since switching. Documentation for our glass quality certification was provided without any additional requests.”
R
Rachel Huang
Quality Director — Guangzhou Glass Processing
★★★★★
“We run 12B-G2 on our 800mm × 800mm tile sorting conveyor. The wide rubber support prevents tile chipping at the conveyor entry point where the tile drops from the kiln roller to the chain — the rubber cushioning absorbs the impact that would fracture tile edges on bare-steel chain.”
P
Pedro Costa
Plant Manager — Lisbon Ceramic Tile Factory
Frequently Asked Questions
When should I choose G2 over G1 on 12B base chain?+
Choose G2 when your product base width is wider than approximately 35mm and the contact pressure from the G1 profile would exceed the marking or deformation threshold for your surface finish. In practical terms: large-format panels and glass sheets above 600mm width, ceramic tiles in 600mm+ formats, and any product where G1 conveying produced visible contact marks. G1 remains appropriate for smaller products where the narrower contact is an advantage for product stability.
Does the wider G2 profile require guide rail spacing adjustment?+
Yes — the G2 profile extends beyond the base chain’s standard outer plate width. Side guides must be set with adequate clearance to avoid contact with the rubber profile edges. For a 12B-G2 chain with 60mm overall rubber width, side guides should be set with minimum 5mm clearance on each side beyond the rubber edge — giving a minimum guide spacing of 70mm centreline-to-guide from the chain centreline. Check and adjust guide spacing before running G2 chains in a system previously fitted with G1 or standard chain.
Are 12B-G2 chains available in double-strand configurations?+
Yes — duplex rubber top chains are available in 12B-G2 specification for conveyor applications requiring greater load capacity or wider product support. In duplex configuration, two chain strands run in parallel on matched sprockets, with the G2 rubber profiles on the outer link plates of each strand creating a wider combined conveying surface. Specify the required strand spacing when ordering duplex configurations.
What is the service interval for 12B-G2 rubber top chains in glass production?+
In glass lehr outfeed applications operating at 40–70°C, 12B-G2 chains with silicone rubber compound typically achieve 18–24 months service life before the rubber profile shows hardening that increases contact pressure above the marking threshold. In ambient-temperature panel and tile applications, NBR rubber profiles typically last 24–36 months. Annual rubber hardness checks — using a Shore A durometer — identify hardening before it reaches the marking threshold.
Can G2 chains be mixed with G1 chains in the same conveyor run?+
No — G1 and G2 profiles have different rubber widths and different overall chain widths. Mixing in the same run creates different contact widths per link, which generates uneven product support and can cause narrow-format products to tip at G2 links and wide-format products to contact the steel plate at G1 links. Always use the same rubber profile type throughout a single conveyor run.
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Further reading: BS and ANSI roller chain standards compared.
