R1608S

R1608S belongs to the 'softener' category (English category name 'Softener'), official one-liner 'nonwoven meltblown fabric softening', mechanism field 'internal-addition softening', main ingredient 'silicone polymer'—its function is defined as softening finishing for textiles such as meltblown fabric and nonwoven fabric, and its use route is plastic internal addition. Official overview sentence: 'R1608S softener is developed specifically for meltblown materials that become brittle and hard. It is a basic component for softening finishing agents for textiles such as meltblown fabric and nonwoven fabric. It has optimal adsorption, compatibility, and ease of emulsification. Using a mixer or homogenizer, R1608S softener is readily emulsified by suitable surfactants into a stable, transparent microemulsion. It can be used alone or combined with other organic softeners into special softening finishing agents, suitable for softening finishing of various textiles such as meltblown fabric and nonwoven fabric.' (Data source: product handbook / official product data)

Names and spellings: the handbook-level TDS page title is 'Meltblown masterbatch dedicated softener R1608S', the catalog line is 'R1608S: plastic internal-addition softener, nonwoven fabric, meltblown fabric, etc.'; the official full name is 'Plastic internal-addition softener R1608S', and the English name is 'Plastic Softener R1608S'. The product positioning direction can be summarized as: silicone polymer system · solving brittleness and hardness · improving melt index. (Data source: product handbook / official product data)

Attribution and coordinates: at the handbook level it is listed in the comprehensive series section of the product catalog, on its own line (the R930 line is adjacent above and the R902 line is adjacent below); at the official level it is included in the comprehensive series; the application domain is registered as fiber and textile domain. (Data source: product handbook / official product data)

What it is not: it is not a softening softener in the silk-like direction (that is R169, with category field 'softening softener'); it is not R1618 of the 'conductive hyperdispersant' category; it is not the matting (R930) / external lubrication (R902) directions adjacent in the same handbook; it is not the masterbatch / resin / filler itself; the documentation does not present it as a pairing, substitute, upgrade, or derivative relationship with any grade. (Data source: product handbook / official product data)

Data boundaries: the documentation provides the overview sentence, main ingredient, four physicochemical properties, four product advantages, four main functions, application fields, addition dosage, packaging, and storage conditions; it does not list shelf life, transportation terms, methods of use (feeding order / mixing method / addition point), processing temperature window, precautions / safety notes / disclaimer, or test methods. All values on this page are values recorded in the documentation, not performance claims. (Data source: product handbook / official product data)

• Core product advantages (four items at the handbook level, verbatim): good electrical insulation, flame retardancy, and weather resistance.
• Ideal physiological and chemical inertness, non-toxic, and does not pollute the ecological environment.
• Low glass transition temperature, good high- and low-temperature resistance, and low viscosity-temperature rheological variation.
• Easy spreading and film formation, defoaming, hydrophobicity, and lubricity caused by reduced surface tension—all four are directional enumerations of the intrinsic properties of silicone, without quantitative values attached.
• Main functions (four items at the handbook level): toughening (increases the tensile strength and elongation at break of meltblown fabric, making it less likely to break and not brittle); improving hand feel (softer, smoother); improving filtration efficiency (high melt index and random structure make the meltblown fabric structure denser); reducing processing temperature (reduces carbonization and die-head clogging).
• The detail-page function list additionally has one item, 'improving melt flow index (MFI): greatly improves the fluidity and melt index of plastics, optimizing processing performance and spinning smoothness'—this is a detail-page-level statement; specific MFI values are not provided in the documentation, and this page does not make quantitative statements.

The core component of this product is 'silicone polymer' (the handbook-level and official main ingredient fields share the same source and value)—a textile softening finishing auxiliary with silicone as its core. Its four product advantages (electrical insulation / physiological and chemical inertness / low glass transition temperature and high- and low-temperature resistance / spreading, film formation, and lubrication brought by low surface tension) are all directional enumerations of the intrinsic properties of silicone. (Data source: product handbook / official product data)

Usage clues (verbatim from the overview sentence): 'Using a mixer or homogenizer, R1608S softener is readily emulsified by suitable surfactants into a stable, transparent microemulsion.' 'It can be used alone or combined with other organic softeners into special softening finishing agents.' The product's operating route is plastic internal addition—fully mixed with resin / meltblown material. (Data source: product handbook)

Performance boundaries: the four functions and four advantages are all qualitative statements—no increase values for tensile strength and elongation at break, no quantified filtration efficiency, no temperature reduction range, and no measured MFI values. This page does not extrapolate or make promises. (Data source: product handbook / official product data)

1. Internal addition incorporation — fully mixed with meltblown materialThe route is plastic internal addition; the overview sentence gives a process clue, 'using a mixer or homogenizer', and it can be emulsified into a stable, transparent microemulsion before use.
2. Toughening and brittleness resistance — increasing tensile strength and elongation at break'Toughening effect: increases the tensile strength and elongation at break of meltblown fabric, making it less likely to break and not brittle'—a development direction aimed at meltblown materials that become brittle and hard.
3. Improved hand feel and surface — soft, smooth'Improved hand feel: makes meltblown fabric softer and smoother, enhancing tactile comfort'; the low surface tension of silicone provides easy spreading, film formation, and lubricity.
4. Structure densification — high melt index and random structure'Improving filtration efficiency: through high melt index and random structure, the meltblown fabric structure is made denser, thereby improving filtration performance'; the detail-page level separately records 'improving melt flow index (MFI)', but specific values are not provided in the documentation.
5. Reducing processing temperature (directional) — reducing carbonization and die-head clogging'Reducing processing temperature: some softeners have a cooling effect, which can reduce carbonization and die-head clogging'—a directional statement at the handbook level; the temperature reduction range is not provided.

The table below summarizes the main components and physicochemical indicators of R1608S as recorded in the product handbook and official product data. The values in the table are values recorded in the source materials (retaining the original notation and units); before bulk use, it is recommended to conduct small-scale trials with your own meltblown material and process.

Reading notes: ① The four indicators are transcribed layer by layer as recorded, without cross-modification — the handbook layer gives 'Appearance: transparent liquid', 'Density: 0.889g/cm³', 'Viscosity: 200-400mPas', while the detail page layer gives '6.8 – 7.0', '0.889 g/cm³', '200 – 400 mPa·s'; ② the viscosity unit difference has been explained by a note on the detail page itself (the source records the viscosity unit as 'mPas', which by convention is mPa·s / millipascal-second); ③ each of the four items has only one set of values; no multiple values coexist; ④ the values in the table are values recorded in the source materials; before bulk use, it is recommended to conduct small-scale trials. (Data source: product handbook / official product data)

The dosage is recorded as the same value (2%-5%) across three layers; the only difference is in notation. The denominator basis is not stated in the source materials — this page transcribes the range as recorded, explicitly notes it, and does not invent a denominator. The layer-by-layer verification is as follows in the table.

Factors determining dosage: the source materials do not provide directional clauses such as 'oil absorption value / mesh / thickness' — the basis for dosage adjustment for this grade is not recorded in the source materials. For actual addition amount, please request the accompanying technical documents for the specific material number and conduct a small-scale trial; the denominator and values for other grades in the same series (e.g., 0.5%-2% for the silk-like direction) do not apply to this grade.

To be verified: ① The dosage denominator basis (relative to resin / meltblown material / total formulation) is not stated in the source materials — this has been explicitly noted, and it is recommended that the source side supplement it; ② This grade has no thickness-dosage directional clause (there is no wording such as 'add more as it becomes thinner / add less as it becomes thinner'); this page does not state one and does not apply the directional conclusions of other grades; ③ The above are values recorded in the source materials; for actual production, please confirm by small-scale trial with your own meltblown material and process. (Data source: product handbook / official product data)

The target systems given in the source material [Application fields] and the summary statement are two types of production lines: PP meltblown fabric and nonwoven fabric; the detail page layer additionally lists three scenario cards and four form checkboxes. Item by item as follows:

PP meltblown fabric

The source material [Application fields] original text: 'Used in the production of PP meltblown fabric and nonwoven fabric, especially suitable for products such as masks and medical protective materials that require high flexibility and comfort'; the scenario card corresponds to improving brittleness and stiffness and increasing MFI.

Nonwoven fabric

Summary statement: 'Suitable for softening finishing of various textiles such as meltblown fabric and nonwoven fabric'; the scenario card corresponds to the soft, smooth, skin-friendly direction.

Masks / Medical protective materials

The source material specifically names 'especially suitable for products such as masks and medical protective materials that require high flexibility and comfort'.

Usage method (internal addition route)

Used by thoroughly mixing with resin / meltblown material; process clues: 'use a mixer or homogenizer' and 'readily emulsified by suitable surfactants into a stable, transparent microemulsion'; can be used alone or combined with other organic softeners.

Masterbatch-side relationship

In masterbatch-related materials and the official data layer, no corresponding entry for this grade is found, and no 'internal use'-type mapping is found — write 'no correspondence'; do not infer.

Field issues & application examples (as recorded in the source material)

The most likely to be associated by number are R1618 (shares the '16 / 8' digit positions) and R169 (same category, both in the softening direction); next are R18 / R1800-S / R880 (similar digits and trailing S); also on the list are the same-booklet adjacent R930 (upper neighbor) and R902 (lower neighbor). At the documentation level, each grade is independent and is not written as a parent-child code or substitution relationship — values are not copied from one another. The comparison is as follows:

Reading notes: 1. The comparison only explains the respective documentation positioning and applicable targets of each grade; the dosage denominators differ by grade, and values cannot be interchangeably applied; 2. Judgment is based only on the four items: official full name, category field, mechanism field, and target system; do not guess from the number, and do not analogize by appearance; 3. Do not transfer R169's silk-like application and 0.5%-2% dosage to this grade, and do not write the values of R1618 / R18 / R880 into this grade. (Data source: product handbook / official product data)

The following points are taken item by item from the documentation; items not listed in the documentation are not drafted.

The data on this page comes from two types of documentation, traceable item by item:

• Product handbook: the full section of this grade's TDS page (overview / main ingredients / four physical and chemical properties / four product advantages / four main functions / application fields / addition content / packaging / storage conditions); catalog row and the upper and lower neighboring rows in the same booklet.
• Official product data: all fields for this grade (name, category, tagline, description, mechanism, application, parameters, main ingredients, addition content, packaging); detail page layer copy (scenario card, form checkboxes, unit self-annotation).

Not covered by the source material (not written on this page — to be added later)

• The dosage denominator basis is not specified in the documentation (same value across three layers, 2%-5%; denominator not recorded) — it is recommended that the documentation side add this record.
• The detail page layer function list has one more MFI statement than the handbook layer; the specific MFI value is not given, and this page makes no quantitative statement.
• The four indicators have no test methods / conditions / standard numbers; the four functions have no quantified values whatsoever — if measured data criteria are needed, request the accompanying technical documents.
• Shelf life, transport, usage method, processing temperature window, precautions / safety notes / disclaimer are not listed — not drafted on their behalf.
• No documentation was found for the corresponding masterbatch-side entry — write 'no correspondence'; do not infer.