In the textile-coating addition-cure LSR spectrum, the "symmetric 1:1 ratio (A 60k/B 50k mPa·s@25℃)" and "Pt-locked-in-A + vinyl/SiH B addition with no low-molecular byproduct" jointly dictate universal adhesion across cotton/poly-cotton/nylon/linen/wool/silk, screen-self-leveling (shrink <0.1% no deform), and fast-cure efficiency at 150℃×60s (<1mm). The prior 3M40-xx series are "2:100 micro-Pt + single-fabric (lace/silk/polyester) dedicated"; general screen-print needs symmetric ratio, wide-fabric compatibility, pot-life ≥60min "all-rounder"; condensate RTV releases alcohol shrink >0.5% causing screen logos fat-edge. As apparel woven-label/flower-tape/anti-slip tablecloth/outdoor tent-umbrella fabrics demand "2-part 1:1, transparent, Shore A 35±2, tensile ≥4.5MPa, tear ≥4.0kgf/mm, elong ≥450%, shrink <0.1%, 25℃ pot-life ≥60min, 150℃×60s fast cure, 20kg×2 split, <37℃ 12mo," sourcing a cotton/linen/silk/wool universal domestic product has become the core gap for general textile-print glue localization.
Addressing this "general screen-print" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Addition Screen-Printing Liquid Silicone Rubber IOTA LSR 3140 (2-part Pt-cured methylvinyl polysiloxane, A/B colorless semi-transparent viscous). Characterized by "pre-cure A:B 1:1 (wt), A 60,000±5,000mPa·s/B 50,000±5,000mPa·s (25℃), sp.gr 1.08±0.02; post-cure transparent, Shore A 35±2, tensile ≥4.5MPa, tear ≥4.0kgf/mm, elong ≥450%, shrink <0.1%, 25℃ pot-life ≥60min, <1mm 150℃×60s full cure; Pt in A, avoid N/S/P/Sn, A/B 20kg drum, <37℃ unopened 12mo," and backed by "1:1 symmetric easy-mix + Pt no-byproduct zero-shrink + 35A high-trans lucid 3D," it serves as the "screen-print anchor" for cotton/poly/nylon/silk/linen/wool multi-fabric print, woven label, anti-slip scallop tablecloth, outdoor tent-umbrella cloth.
Molecular Architecture: Pt Locked A + 1:1 Symmetric Easy-Mix + No-Low-Mol Zero-Shrink 3D Logic
The core competitiveness of IOTA LSR 3140 stems from its "Part A: vinyl polysiloxane + Pt catalyst (Karstedt, locked in A); Part B: SiH polysiloxane crosslinker + fumed silica/multi-fabric adhesion aid" architecture:
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Pt Locked A Anti-Cross-Poison： Pt only in A, B pure crosslink side—activation only when same-batch A:B=1:1 mix; symmetric weigh (err <2% stable) lowers line-scale burden, A/B same-size drums easy batch-swap; this lets B safely take color paste (color into B then equal A), avoiding trace S/amine in pigment killing Pt direct.
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1:1 Symmetric + 60k Mid-Visc Print： Blend ~55k mPa·s (25℃ stirred, A60k/B50k weighted) is "general screen mid-visc"—thinner than LOGO 3M35 (86k), thicker than polyester 3M40-41 (26k), passes 40-80mesh screen self-level no clog, no slump on vertical cloth; cotton coarse / silk smooth / PET hydrophobic all fit, no per-fabric glue swap.
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No-Low-Mol Zero-Shrink： Pt addition –Si–CH=CH₂+H–Si–→–Si–CH₂CH₂–Si– releases no alcohol/water/acetic, volumetric shrink <0.1% (condensate RTV 0.3-0.8%), screen woven-label font edge sharp no fatten, anti-slip dot-matrix round, 3D layered high (35A mid-hard holds 0.3-0.8mm screen emboss).
Performance Leap: From "Condensate RTV Fat-Edge" to "1:1 Pt <0.1% Sharp-Edge"
Incorporating IOTA LSR 3140 enables qualitative leaps:
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Apparel Woven-Label / Flower Tape： Jeans back-pocket label, sports sleeve flower, lingerie strap logo—40-80mesh screen → 150℃×60s cure, font sharp, 50 washes no crack no fall, silk scarf print logo no smother grain.
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Anti-Slip Utility： Yoga mat grip dots, placemat/anti-slip scallop tablecloth, curtain hem grip—cotton/poly/nylon universal print, 35A soft no skin-poke.
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Outdoor Premium Cloth： Tent seam seal strip, premium umbrella bone-groove anti-slip, camp chair cloth grip—aging/high-low humidity cycle (-50~200℃ elastic).
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Electronic & Industrial Coat： Silicone keycap legend, insulating cloth coat, seal cloth treat (extended use).
Application Penetration: From Jeans Woven-Label to Tent Bone-Groove
IOTA LSR 3140 covers sectors triple-sensitive to "multi-fabric universal + 1:1 easy-mix + zero-shrink 3D":
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Apparel Trim： Woven label, flower tape, anti-slip tape, sportswear logo, lingerie silicone tag.
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Home Textile： Anti-slip tablecloth, placemat, curtain hem, sofa cloth grip dot.
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Outdoor Gear： Tent cloth, premium umbrella cloth, camp tent frame anti-slip, aging-resistant cloth seal.
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Industrial Coat： Insulating cloth, anti-corrosion cloth, high-temp cloth, electronic potting/coat (extended).
IOTA Technical Guide: Same-Batch 1:1, Color in B then A, Avoid N/S/P/Sn
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Mix： Same batch A:B by mass 1:1 (err <2%), stir 3-5min to transparent uniform, vac degas (-0.095~-0.1MPa×3-5min, 4-5× volume); 25℃ pot-life ≥60min, over-time thickens.
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Color Rule (hard)： To tint, put paste into B, stir, then mix equal A; never pigment direct into A (Pt contact trace S/amine in some pigments local non-cure); never cross-batch A/B, take-tools separate or wipe clean.
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Cure： Recommend heat 150℃×60s (thickness <1mm), or 120-130℃ tens-sec to ten-odd min; RT 25℃ slow cure (hours to ten-odd hrs); thick >1mm suggest multi-pass screen or heat + 150℃×1h anneal.
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Taboo Red Line： Absolute isolation from Pt poisons—nitrogen (amines/ammonia/urea), sulfur (thiols/sulfides/latex gloves/some rubber squeegees), phosphorus (phosphines/phosphate esters), organotin (condensate silicone curatives), heavy metals (Pb/Hg/Sn salts), acid/alkali/water/condensate alcohol; exclusive tools (PP/ceramic/clean SS), never share with epoxy/PU/RTV; pre-wash cotton size / PET spin-finish.
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Storage： A/B 20kg iron drum each; unopened <37℃ cool dry ventilated, shelf 12 months, over-shelf test visc/cure/hardness and extend if qualified; non-haz general chemical, ventilate, nitrile gloves (no latex glove sulfur).
Industry experts note that under apparel woven-label upgrading from "PVC heat-transfer" to "screen-print silicone 3D tag", and outdoor tent/umbrella mandating aging-resistant REACH/RoHS compliance, general screen-print LSR is upgrading from "Wacker Elastosil® LR screen-branch / Momentive Silopren® LSR 303x import followers" to "1:1 symmetric zero-shrink general reference glue." IOTA LSR 3140, with its "A:B 1:1 + blend ~55k + A60k/B50k + Shore A 35±2 + tensile ≥4.5MPa + tear ≥4.0kgf/mm + shrink <0.1% + 150℃×60s + 12mo" hard metrics,
fills the domestic supply chain gap for general screen-print liquid silicone in cotton/poly/nylon/silk multi-fabric label/anti-slip fields, providing a mass-producible path to replace imported screen silicones for downstream label/webbing/outdoor-cloth makers. This confirms domestic print LSR is advancing steadily along "condensate RTV (alcohol fat-edge) → 2:100 dedicated 3M40-xx → 1:1 general screen 3140 (multi-fabric zero-shrink)," with growing technical say in textile screen-print key print-glues.
