{"id":12245,"date":"2026-06-12T05:32:33","date_gmt":"2026-06-12T05:32:33","guid":{"rendered":"https:\/\/nylonplastic.com\/pbt-gf30-glass-filled-polybutylene-terephthalate-guide\/"},"modified":"2026-06-12T05:32:33","modified_gmt":"2026-06-12T05:32:33","slug":"pbt-gf30-glass-filled-polybutylene-terephthalate-guide","status":"publish","type":"post","link":"https:\/\/nylonplastic.com\/ja\/pbt-gf30-glass-filled-polybutylene-terephthalate-guide\/","title":{"rendered":"PBT GF30: Properties, Datasheet, and Complete Guide to Glass-Filled Polybutylene Terephthalate"},"content":{"rendered":"

What Is PBT GF30?<\/h2>\n

PBT GF30 is polybutylene terephthalate reinforced with 30% glass fiber by weight. It is one of the most widely specified glass-filled engineering thermoplastics in automotive and electrical applications \u2014 and for good reason.<\/p>\n

Adding 30% short glass fiber to an unfilled PBT resin more than doubles its tensile strength, quadruples its flexural modulus, and pushes its heat deflection temperature (HDT) from approximately 60\u00b0C to above 200\u00b0C. These gains make PBT GF30 the default choice whenever designers need a stiff, dimensionally stable polyester that survives underhood temperatures and retains its electrical properties in humid environments.<\/p>\n

For procurement teams and design engineers searching for PBT GF30 datasheets, grade comparisons, or supplier alternatives<\/strong>, this page covers the critical data points \u2014 mechanical properties, thermal limits, processing parameters, common grades, and how PBT GF30 stacks up against competing materials.<\/p>\n

PBT GF30 Typical Properties<\/h2>\n

The table below consolidates datasheet values from multiple commercial PBT GF30 grades. Exact figures vary by manufacturer and additive package, but these ranges represent what you can expect from a standard 30% glass-filled PBT.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\nTest Method<\/th>\nTypical Value<\/th>\nUnit<\/th>\n<\/tr>\n<\/thead>\n
\u5bc6\u5ea6<\/td>\nISO 1183 \/ ASTM D792<\/td>\n1.52 \u2013 1.65<\/td>\ng\/cm\u00b3<\/td>\n<\/tr>\n
Water Absorption (24h, 23\u00b0C)<\/td>\nISO 62 \/ ASTM D570<\/td>\n0.05 \u2013 0.12<\/td>\n%<\/td>\n<\/tr>\n
Tensile Strength at Break<\/td>\nISO 527 \/ ASTM D638<\/td>\n120 \u2013 140<\/td>\nMPa<\/td>\n<\/tr>\n
Tensile Modulus<\/td>\nISO 527 \/ ASTM D638<\/td>\n9,500 \u2013 11,500<\/td>\nMPa<\/td>\n<\/tr>\n
\u7834\u65ad\u4f38\u5ea6<\/td>\nISO 527 \/ ASTM D638<\/td>\n2.0 \u2013 3.5<\/td>\n%<\/td>\n<\/tr>\n
Flexural Strength<\/td>\nISO 178 \/ ASTM D790<\/td>\n190 \u2013 210<\/td>\nMPa<\/td>\n<\/tr>\n
\u66f2\u3052\u5f3e\u6027\u7387<\/td>\nISO 178 \/ ASTM D790<\/td>\n8,000 \u2013 10,500<\/td>\nMPa<\/td>\n<\/tr>\n
Charpy Notched Impact (23\u00b0C)<\/td>\nISO 179-1eA<\/td>\n7 \u2013 12<\/td>\nkJ\/m\u00b2<\/td>\n<\/tr>\n
Izod Notched Impact (23\u00b0C)<\/td>\nASTM D256<\/td>\n80 \u2013 110<\/td>\nJ\/m<\/td>\n<\/tr>\n
HDT @ 1.80 MPa<\/td>\nISO 75 \/ ASTM D648<\/td>\n200 \u2013 220<\/td>\n\u00b0C<\/td>\n<\/tr>\n
HDT @ 0.45 MPa<\/td>\nISO 75 \/ ASTM D648<\/td>\n215 \u2013 225<\/td>\n\u00b0C<\/td>\n<\/tr>\n
\u6eb6\u878d\u6e29\u5ea6<\/td>\nDSC<\/td>\n220 \u2013 225<\/td>\n\u00b0C<\/td>\n<\/tr>\n
Molding Shrinkage (flow)<\/td>\nISO 294-4<\/td>\n0.2 \u2013 0.5<\/td>\n%<\/td>\n<\/tr>\n
\u4f53\u7a4d\u62b5\u6297\u7387<\/td>\nIEC 60093 \/ ASTM D257<\/td>\n10\u00b9\u2075 \u2013 10\u00b9\u2076<\/td>\n\u03a9\u00b7cm<\/td>\n<\/tr>\n
Dielectric Strength<\/td>\nIEC 60243 \/ ASTM D149<\/td>\n18 \u2013 22<\/td>\nkV\/mm<\/td>\n<\/tr>\n
Flammability (1.6 mm)<\/td>\nUL 94<\/td>\nHB (standard); V-0 (FR grades)<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Glass Fiber Content Comparison: PBT GF10 to PBT GF50<\/h2>\n

PBT is commercially available with glass fiber loadings from 10% to 50%. Each step trades ductility for stiffness, and the sweet spot depends on the application.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
\u30b0\u30ec\u30fc\u30c9<\/th>\nGF Content<\/th>\n\u5f15\u5f35\u5f37\u3055 (MPa)<\/th>\n\u66f2\u3052\u5f3e\u6027\u7387 (MPa)<\/th>\nHDT @ 1.8 MPa (\u00b0C)<\/th>\nImpact (kJ\/m\u00b2)<\/th>\n\u5bc6\u5ea6 (g\/cm\u00b3)<\/th>\n<\/tr>\n<\/thead>\n
Unfilled PBT<\/td>\n0%<\/td>\n50 \u2013 60<\/td>\n2,200 \u2013 2,600<\/td>\n50 \u2013 60<\/td>\n4 \u2013 5<\/td>\n1.30 \u2013 1.31<\/td>\n<\/tr>\n
PBT GF10<\/td>\n10%<\/td>\n85 \u2013 95<\/td>\n4,000 \u2013 4,800<\/td>\n190 \u2013 200<\/td>\n4 \u2013 6<\/td>\n1.38 \u2013 1.40<\/td>\n<\/tr>\n
PBT GF15<\/td>\n15%<\/td>\n100 \u2013 115<\/td>\n5,500 \u2013 6,500<\/td>\n195 \u2013 205<\/td>\n5 \u2013 7<\/td>\n1.42 \u2013 1.46<\/td>\n<\/tr>\n
PBT GF20<\/td>\n20%<\/td>\n105 \u2013 120<\/td>\n6,500 \u2013 7,500<\/td>\n200 \u2013 210<\/td>\n6 \u2013 9<\/td>\n1.45 \u2013 1.50<\/td>\n<\/tr>\n
PBT GF30<\/strong><\/td>\n30%<\/strong><\/td>\n120 \u2013 140<\/strong><\/td>\n8,000 \u2013 10,500<\/strong><\/td>\n200 \u2013 220<\/strong><\/td>\n7 \u2013 12<\/strong><\/td>\n1.52 \u2013 1.65<\/strong><\/td>\n<\/tr>\n
PBT GF40<\/td>\n40%<\/td>\n135 \u2013 155<\/td>\n10,500 \u2013 13,000<\/td>\n210 \u2013 223<\/td>\n8 \u2013 11<\/td>\n1.60 \u2013 1.72<\/td>\n<\/tr>\n
PBT GF50<\/td>\n50%<\/td>\n145 \u2013 165<\/td>\n14,000 \u2013 17,000<\/td>\n215 \u2013 225<\/td>\n9 \u2013 13<\/td>\n1.68 \u2013 1.78<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Key takeaway:<\/strong> PBT GF30 lands in the center of the cost-performance curve. It delivers roughly 90% of the stiffness of GF50 at a lower price per kilogram and with better moldability. Below GF20, you lose significant HDT and creep resistance. Above GF40, warpage, viscosity, and tool wear become harder to manage.<\/p>\n

Common PBT GF30 Commercial Grades<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Manufacturer<\/th>\n\u30b0\u30ec\u30fc\u30c9<\/th>\nKey Feature<\/th>\nTypical Application<\/th>\n<\/tr>\n<\/thead>\n
BASF<\/td>\nUltradur B4300G6<\/td>\nStandard GF30, high flow<\/td>\nAutomotive housings, connectors<\/td>\n<\/tr>\n
BASF<\/td>\nUltradur B4300G6 HR<\/td>\nGF30 + hydrolysis resistant<\/td>\nUnderhood connectors, sensor bodies<\/td>\n<\/tr>\n
BASF<\/td>\nUltradur B4406G6<\/td>\nGF30 + flame retardant<\/td>\nElectrical enclosures, relays<\/td>\n<\/tr>\n
Celanese<\/td>\nCelanex 3300 GF30<\/td>\nStandard GF30, good surface<\/td>\nAppliance components, handles<\/td>\n<\/tr>\n
Polyplastics<\/td>\nDuranex 3300 GF30<\/td>\nStandard GF30<\/td>\nGeneral industrial parts<\/td>\n<\/tr>\n
SABIC<\/td>\nValox 420<\/td>\nGF30, UL94 HB<\/td>\nElectrical, lighting<\/td>\n<\/tr>\n
SABIC<\/td>\nValox 420SEO<\/td>\nGF30 + V-0 FR<\/td>\nCircuit breaker housings<\/td>\n<\/tr>\n
Ensinger<\/td>\nTECADUR PBT GF30<\/td>\nStock shape (rod\/plate)<\/td>\nMachined precision components<\/td>\n<\/tr>\n
Lanxess<\/td>\nPocan B3235<\/td>\nGF30, impact modified<\/td>\nAutomotive interior, door handles<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

PBT GF30 vs. Competing Materials<\/h2>\n

PBT GF30 vs. PA66 GF30<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\nPBT GF30<\/th>\nPA66 GF30<\/th>\n\u5099\u8003<\/th>\n<\/tr>\n<\/thead>\n
\u5bc6\u5ea6<\/td>\n1.52 \u2013 1.65<\/td>\n1.35 \u2013 1.38<\/td>\nPA66 GF30 is lighter<\/td>\n<\/tr>\n
\u5f15\u5f35\u5f37\u5ea6<\/td>\n120 \u2013 140 MPa<\/td>\n170 \u2013 190 MPa<\/td>\nPA66 stronger in dry state<\/td>\n<\/tr>\n
HDT @ 1.8 MPa<\/td>\n200 \u2013 220\u00b0C<\/td>\n240 \u2013 255\u00b0C<\/td>\nPA66 higher short-term heat<\/td>\n<\/tr>\n
\u6c34\u5206\u5438\u53ce<\/td>\n0.05 \u2013 0.12%<\/td>\n1.5 \u2013 2.5%<\/td>\nPBT major advantage<\/strong><\/td>\n<\/tr>\n
Dimensional Stability (humid)<\/td>\n\u7d20\u6674\u3089\u3057\u3044<\/td>\nPoor (swells with moisture)<\/td>\nDecisive for electrical parts<\/td>\n<\/tr>\n
\u8010\u85ac\u54c1\u6027<\/td>\nGood vs fuels\/oils\/acids<\/td>\nGood vs oils, poor vs acids<\/td>\nPBT broader chemical tolerance<\/td>\n<\/tr>\n
Dielectric Strength<\/td>\n18 \u2013 22 kV\/mm<\/td>\n18 \u2013 24 kV\/mm<\/td>\nComparable dry, PBT wins wet<\/td>\n<\/tr>\n
\u30ce\u30c3\u30c1\u4ed8\u304d\u30a4\u30f3\u30d1\u30af\u30c8<\/td>\n7 \u2013 12 kJ\/m\u00b2<\/td>\n10 \u2013 15 kJ\/m\u00b2<\/td>\nPA66 tougher<\/td>\n<\/tr>\n
Price (relative)<\/td>\nModerate<\/td>\n\u3088\u308a\u4f4e\u3044<\/td>\nPA66 typically cheaper per kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

When to choose PBT GF30 over PA66 GF30:<\/strong> If your part lives in a humid environment and must hold tight tolerances, PBT wins every time. Electrical connectors, sensor housings, and precision mechanical parts exposed to ambient moisture are textbook PBT territory. PA66 swells \u2014 PBT does not.<\/p>\n

PBT GF30 vs. PET GF30<\/h3>\n

PBT and PET are both thermoplastic polyesters, and both benefit from 30% glass reinforcement. PBT crystallizes faster, which translates to shorter molding cycles (a 20\u201330% productivity advantage in injection molding). PET GF30 pushes HDT slightly higher (225\u2013235\u00b0C) and offers better surface gloss, but processes slower and requires higher mold temperatures (120\u2013140\u00b0C vs. 60\u201380\u00b0C for PBT). For most injection-molded components, PBT GF30 is the more economical choice.<\/p>\n

PBT GF30 vs. PPS GF40<\/h3>\n

PPS GF40 operates in the 260\u00b0C+ continuous-use range, far above PBT’s ceiling. It also provides inherently flame-retardant performance (V-0 without additives). But PPS costs 3\u20135\u00d7 more than PBT. Unless your application demands sustained exposure above 180\u00b0C, PBT GF30 is the cost-effective route.<\/p>\n

Processing Guidelines: Injection Molding PBT GF30<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\n\u63a8\u5968\u5024<\/th>\n<\/tr>\n<\/thead>\n
Pre-drying<\/td>\n120\u00b0C for 3\u20134 hours (dew point \u2264 -30\u00b0C)<\/td>\n<\/tr>\n
Melt Temperature<\/td>\n250 \u2013 270\u00b0C<\/td>\n<\/tr>\n
\u91d1\u578b\u6e29\u5ea6<\/td>\n60 \u2013 80\u00b0C (up to 100\u00b0C for high-gloss)<\/td>\n<\/tr>\n
Injection Speed<\/td>\nMedium to fast<\/td>\n<\/tr>\n
Holding Pressure<\/td>\n50 \u2013 80 MPa<\/td>\n<\/tr>\n
Back Pressure<\/td>\nLow, 3 \u2013 7 MPa<\/td>\n<\/tr>\n
Screw Speed<\/td>\n50 \u2013 100 rpm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Critical notes for PBT GF30 processing:<\/strong><\/p>\n

    \n
  • Moisture sensitivity:<\/strong> PBT hydrolyzes at melt temperatures. Anything above 0.02% moisture content will degrade mechanical properties. Dry it \u2014 every time.<\/li>\n
  • Fiber orientation:<\/strong> Glass fibers align with flow direction, creating anisotropic shrinkage. Expect 0.2\u20130.5% shrinkage parallel to flow and 0.5\u20131.0% perpendicular. Gate placement matters.<\/li>\n
  • Tool wear:<\/strong> 30% glass fiber is abrasive. Use hardened tool steel (HRC 54+) or hard chrome plating on mold surfaces.<\/li>\n
  • \u6eb6\u63a5\u30e9\u30a4\u30f3\uff1a<\/strong> Glass-filled PBT forms visible, mechanically weaker weld lines. Position gates so knit lines occur in non-structural, low-visibility zones.<\/li>\n<\/ul>\n

    Key Applications of PBT GF30<\/h2>\n
    \n\n\n\n\n\n\n\n\n\n\n\n
    \u7523\u696d<\/th>\nApplication<\/th>\nWhy PBT GF30<\/th>\n<\/tr>\n<\/thead>\n
    \u81ea\u52d5\u8eca<\/td>\nECU housings, sensor bodies, connector shells<\/td>\nDimensional stability underhood, moisture resistance<\/td>\n<\/tr>\n
    \u81ea\u52d5\u8eca<\/td>\nDoor handles, mirror housings, wiper system brackets<\/td>\nStiffness, surface finish, chemical resistance<\/td>\n<\/tr>\n
    Electrical \/ Electronics<\/td>\nRelay bases, circuit breaker housings, terminal blocks<\/td>\nDielectric strength, arc tracking resistance, low moisture pickup<\/td>\n<\/tr>\n
    Electrical \/ Electronics<\/td>\nBobbin \/ coil formers, connector insulators<\/td>\nHeat resistance for soldering, stable dielectric properties<\/td>\n<\/tr>\n
    Appliance<\/td>\nIron handles, toaster end plates, oven knobs<\/td>\nHeat deflection above 200\u00b0C + UL94 FR option<\/td>\n<\/tr>\n
    \u30a4\u30f3\u30c0\u30b9\u30c8\u30ea\u30a2\u30eb<\/td>\nPump housings, valve bodies, gear wheels<\/td>\nCreep resistance, wear performance (especially lubricated grades)<\/td>\n<\/tr>\n
    Lighting<\/td>\nLED heat sinks, lamp holders, reflector bases<\/td>\nHeat resistance + high reflectivity white grades available<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Flame Retardant PBT GF30 (V-0 Grades)<\/h2>\n

    Standard PBT GF30 carries a UL94 HB rating. For electrical applications requiring self-extinguishing behavior, a parallel family of PBT GF30 FR V-0<\/strong> grades exists. These use halogenated or halogen-free flame retardant packages to achieve V-0 at 1.6 mm or thinner.<\/p>\n

    Notable V-0 grades include:<\/p>\n

      \n
    • BASF Ultradur B4406G6<\/strong> \u2014 halogenated FR, GF30, V-0 at 0.75 mm<\/li>\n
    • SABIC Valox 420SEO<\/strong> \u2014 industry benchmark, GF30 V-0<\/li>\n
    • Celanex 3316<\/strong> \u2014 GF30, non-halogen FR option available<\/li>\n<\/ul>\n

      The trade-off: FR additives typically reduce tensile strength by 5\u201310% and impact resistance by 15\u201325% compared to unfilled FR grades. Specify carefully based on whether electrical safety or mechanical load is the primary design constraint.<\/p>\n

      PBT GF30 vs. Mineral-Filled PBT<\/h2>\n

      Glass-filled PBT is not the only reinforcement option. Mineral-filled PBT (typically MD20\u2013MD40, using talc, calcium carbonate, or wollastonite) delivers lower warpage and better isotropic shrinkage at a lower cost \u2014 but sacrifices strength and HDT compared to GF grades.<\/p>\n

      \n\n\n\n\n\n\n\n\n\n\n
      \u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\nPBT GF30<\/th>\nPBT MD30 (Mineral 30%)<\/th>\n<\/tr>\n<\/thead>\n
      \u5f15\u5f35\u5f37\u5ea6<\/td>\n120 \u2013 140 MPa<\/td>\n55 \u2013 65 MPa<\/td>\n<\/tr>\n
      \u66f2\u3052\u5f3e\u6027\u7387<\/td>\n8,000 \u2013 10,500 MPa<\/td>\n4,000 \u2013 5,500 MPa<\/td>\n<\/tr>\n
      HDT @ 1.8 MPa<\/td>\n200 \u2013 220\u00b0C<\/td>\n70 \u2013 100\u00b0C<\/td>\n<\/tr>\n
      Warpage<\/td>\nModerate-high (anisotropic)<\/td>\nLow (isotropic)<\/td>\n<\/tr>\n
      \u8868\u9762\u4ed5\u4e0a\u3052<\/td>\nMatte, fiber-visible<\/td>\nSmooth, paintable<\/td>\n<\/tr>\n
      \u30b3\u30b9\u30c8<\/td>\n\u3088\u308a\u9ad8\u3044<\/td>\n\u3088\u308a\u4f4e\u3044<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

      Choose mineral-filled PBT for large, flat parts where flatness trumps strength \u2014 motor end caps, large housings, lighting bezels. Choose PBT GF30 when structural load and thermal resistance matter.<\/p>\n

      \u3088\u304f\u3042\u308b\u3054\u8cea\u554f<\/h2>\n

      What does PBT GF30 mean?<\/h3>\n

      PBT GF30 means polybutylene terephthalate (PBT) resin compounded with 30% glass fiber (GF) by weight. The glass fibers are typically short-cut E-glass strands, 3\u20136 mm in pellet length, that disperse during injection molding to create a stiff, strong composite.<\/p>\n

      Is PBT GF30 suitable for outdoor use?<\/h3>\n

      Yes \u2014 with the right stabilization package. Standard PBT has good inherent UV resistance compared to unfilled nylons, and GF30 grades are commonly used in exterior automotive components (door handles, mirror housings). For prolonged outdoor exposure, specify a UV-stabilized grade such as BASF Ultradur B4300G6 LS (light-stabilized).<\/p>\n

      Can PBT GF30 be laser-marked?<\/h3>\n

      Yes. PBT responds well to Nd:YAG laser marking. Most GF30 grades produce dark marks on the natural beige\/grey base, and laser-markable grades (e.g., BASF B4300G6 LM) are available for high-contrast applications like connector identification.<\/p>\n

      What is the difference between PBT GF30 and PBT+PET GF30?<\/h3>\n

      PBT+PET GF30 blends combine the faster crystallization of PBT with the higher gloss and slightly better HDT of PET. These blends are common in automotive exterior trim where surface appearance matters and cycle time must stay competitive. Pure PBT GF30 typically offers better chemical resistance.<\/p>\n

      Does PBT GF30 need to be dried before molding?<\/h3>\n

      Absolutely. PBT is sensitive to hydrolysis at processing temperatures. Material must be dried to below 0.02% moisture content \u2014 typically 120\u00b0C for 3\u20134 hours in a desiccant dryer with a dew point of -30\u00b0C or lower. Skipping this step will produce brittle parts with degraded tensile and impact properties.<\/p>\n

      Need PBT GF30 pellets, stock shapes, or machined parts?<\/strong> We supply glass-filled PBT grades from major manufacturers. Contact us with your specification \u2014 grade, quantity, and delivery target \u2014 and we’ll return a quote.<\/p>\n\t\t\t

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