The pressure-sensitive tape designated Saint-Gobain CHR SGB6-06(R) CHEMLAM Brown Glass-PTFE Backing Silicone Adhesive Pressure Sensitive Tape is a composite web in which woven glass cloth is coated with polytetrafluoroethylene and then combined with a silicone pressure-sensitive adhesive on one face. The construction belongs to the glass-fabric-reinforced PTFE tape category. The brown colour originates in the glass-PTFE substrate. The numeric fragment 06 is associated with the 0.006 in (0.152 mm) backing thickness class; total tape thickness is slightly higher because of the adhesive layer. The (R) suffix is a manufacturer-controlled revision or roll-configuration identifier and must be read against the current data sheet for exact lot characteristics. Slit widths and roll lengths are set by converting specifications rather than by a single fixed geometry. The product is used where a non-stick PTFE surface must be combined with high tear resistance, dimensional stability, and a silicone adhesive that retains peel adhesion over a wider temperature interval than common acrylic adhesives. Typical application fields include thermal sealing, electrical insulation, chemical masking, coil wrapping, and release surfaces on heated rollers and guide rails. The tape is selected because the glass carrier limits elongation under tension and because the PTFE surface resists accumulation of polymer melts, adhesives, and thermally degraded residues.

Which Test Methods Define the Relevant Property Set for SGB6-06(R)?

Thickness and adhesive coat weight are assessed by ASTM D3652/D3652M. Breaking force and elongation are measured by ASTM D3759/D3759M. Peel adhesion to stainless steel is determined by ASTM D3330/D3330M, generally at 180° angle and 300 mm/min crosshead speed. Dielectric breakdown is measured by ASTM D149. The following table consolidates representative published values for this configuration; because tape properties vary with batch and converting, the table is a starting point rather than a substitute for lot-specific certificates of analysis. Values obtained on release-coated substrates or low-energy polymers are lower than steel-panel values.

The distinction between backing thickness and total thickness is operationally significant in slot-liner and shim applications where stack height is controlled. The glass fabric carrier produces a low elongation at break of approximately 5%; unsupported skived PTFE tape of the same thickness class may stretch far more before rupture. The low elongation allows the tape to hold position on heated seals without excessive creep. The peel adhesion value to stainless steel is not a direct predictor of performance on hot PTFE jaws; the adhesive is generally supplemented by mechanical clamping or a tensioned outer wrap where shear loads are continuous. Dielectric breakdown voltage is thickness-dependent and is reduced by entrapped air, edge contamination, or moisture; panels should be conditioned at 23 °C and 50% relative humidity before test. The continuous service range of -73 °C to 260 °C applies to the composite; adhesive shear strength begins to decline above approximately 200 °C, and mechanical attachment is therefore advised at the upper end of the range.

The SGB family is distinct from unsupported skived PTFE tapes and from silicone rubber coated glass cloth tapes. In the CHR series, the glass fabric provides tensile strength and thickness control; PTFE coating yields chemical resistance and release; silicone adhesive broadens the thermal service window. The CHEMLAM descriptor is associated with laminated structures intended for chemical and thermal process environments. When comparing within the SGB family, thickness variation changes stiffness, dielectric strength, and roll curvature handling. A thicker backing raises dielectric strength but reduces conformability on small radius rollers. The 0.006 in backing class balances these parameters for general industrial use.

When SGB6-06(R) Is Deployed on Heat-Seal Bars, Plasma Spray Masks, or Roller Release Surfaces

Surface preparation follows a solvent-wipe procedure with isopropyl alcohol or ethyl acetate; the substrate should be dry and free of oxide scale, grease, and release agents. Application is conducted at 15–35 °C. Below 10 °C, the silicone adhesive loses tack and may not wet the substrate sufficiently. On a flat heat-seal jaw, the tape is burnished from centre to edges to push out air pockets. On curved surfaces, the glass carrier does not conform well to radii below approximately 12 mm; slitting, segmenting, or overlapped coverage is required. In rotary sealing lines running at 15–30 m/min, the product is tensioned along the machine direction; the butt splice should be offset from high-pressure contact regions. Heat-sealing of polyethylene and cast polypropylene films commonly uses jaw settings of 120–180 °C, dwell times of 0.5–2.0 s, and pressures of 0.3–0.8 MPa. The PTFE surface prevents molten film transfer, but organic residues from slip agents can slowly build up; periodic wiping with a clean dry cloth while the jaw is hot reduces such accumulation.

In plasma-spray masking, the tape is applied over areas to be protected from alumina grit and sprayed metal. The PTFE layer resists coating adhesion, while the glass carrier provides resistance to grit erosion. Edge lifting is the dominant failure mode; edge sealing with a flexible silicone sealant is standard when coating thickness exceeds 0.5 mm. On corona treater rolls and idler rolls, the smooth PTFE surface reduces deposit formation, but the silicone adhesive is not intended for direct immersion in solvent baths; intermittent contact with solvent vapour is generally tolerated. For electrical slot insulation, the tape is used because the glass-PTFE composite has dielectric strength in the range of 4.5 kV to 5.0 kV under flat electrode conditions; however, the glass fibre intersections create local field inhomogeneities, and the tape should not be treated as sole primary insulation for mains circuits unless creepage and clearance distances are evaluated under IEC 62368-1 or applicable equipment standards.

Slit-edge quality affects dielectric performance. Ragged or cracked edges create field concentration; converting should follow clean shear slitting with blade replacement intervals. The glass fabric may produce free silica dust when cut; local extraction is recommended. On dryer rolls and laminating nip rolls, the product is sometimes used as a wrap. The roll surface must be true and free of ridges; splice overlap can create a raised seam that transfers to coated webs. The preferred seam is a butt joint with the gap filled by a thin PTFE thread or left open if the process tolerates it. For tensioned wraps, the ends are anchored with mechanical bands because silicone adhesive creep at elevated temperature may allow rotation. The glass carrier can absorb moisture if the PTFE coating is abraded; if dielectric performance is critical, conditioned storage and pre-drying at 60 °C for 2 h may be necessary, but the adhesive should not be exposed above 120 °C for extended periods when on the roll.

Compared with glass-PTFE tapes using acrylic adhesives, SGB6-06(R) exhibits lower initial room-temperature tack on steel but retains a larger proportion of adhesion after exposure to 150 °C. Acrylic systems soften above 120 °C and are less suitable for hot-seal applications. Compared with skived PTFE film tape, the glass reinforcement reduces elongation and increases tensile strength; this is an advantage where dimensional stability under tension is required but a limitation where the tape must envelop complex curved profiles. Compared with polyimide tape, the PTFE surface provides lower coefficient of friction and better release against molten polyolefin, but the glass-PTFE product is thicker and may not suit applications with tight stack-height tolerances. The product also differs from non-adhesive PTFE glass cloth, which requires separate adhesive or mechanical fastening; the pressure-sensitive layer permits rapid installation but imposes temperature and chemical constraints.

Comparative property tables between product classes frequently omit the difference in adhesive residue. Silicone adhesives can be formulated as clean-removal or high-hold; the exact SGB6-06(R) residue behaviour on patterned steel or anodised aluminium should be tested at the upper process temperature. On stainless steel, silicone adhesives may leave a visually clean surface but trace siloxane species can remain; verification by water break-free test or dyne testing is required before subsequent surface finishing. The adhesive coat thickness of 0.013 mm is relatively thin; it may not fill rough surfaces. For rough castings with surface roughness above Ra 3.2 µm, mechanical fixing or a thicker adhesive grade may be required.

Silicone pressure-sensitive adhesives present operational boundaries. They should not be used on surfaces destined for subsequent painting or adhesive bonding without cleaning, because siloxane migration can depress surface energy and produce visible wetting defects on coating lines. The product should not be combined with amine-catalyzed silicone sealants without compatibility testing, because condensation reaction by-products can reduce adhesive peel strength. Direct immersion in ketones, chlorinated solvents, or strong alkaline solutions is not covered by standard tape test data; ASTM D543 exposure testing is recommended before process use. Storage at 10–32 °C and relative humidity below 60% is standard for silicone adhesive tapes; shelf life is generally 12 months from date of manufacture when the original liner remains intact. The product is not specified for high-vacuum environments below 10⁻³ mbar because silicone outgassing may exceed system contamination budgets. For food-contact use, PTFE resin can be formulated to meet 21 CFR 177.1550, but the finished tape must be evaluated for adhesive extractables under 21 CFR 175.300 or applicable end-use regulations. RoHS Directive 2011/65/EU and REACH SVHC compliance should be verified through supplier declarations and lot certificates rather than assumed from the chemical composition alone.