Certified plant-based raw materials
C-Series (PLA): Made with NatureWorks Ingeo™ PLA resin that carries BPI certification for industrial composting under ASTM D6400, formulated with our CelluMeld™ blend including 15% PHA for improved heat tolerance (up to 120°F in service). Derived from renewable agricultural feedstocks grown on American farms as a plant-based alternative to conventional fossil-based plastic. Designed for industrial composting facilities where accepted.
M-Series (PHA): Made with Danimer PHA resin carrying TÜV certifications for OK compost HOME, OK compost INDUSTRIAL, OK biodegradable MARINE, and OK biobased. Derived from renewable agricultural feedstocks grown on American farms as a plant-based alternative to conventional fossil-based plastic. Designed for industrial and home composting, soil, and marine environments where local acceptance applies.
PureStalk straws
Quick Decision Matrix
PureStalk C-Series
BPI-Certified Ingeo™ PLA Resin
Best for:
- Standard cold beverage service
- Cost-conscious operations
- Indoor, climate-controlled spaces
- High-volume use
Lower cost option
PureStalk M-Series
TÜV-Certified Danimer PHA Resin
Best for:
- Warm beverage service
- Hot climates or outdoor service
- Premium brand positioning
- Broader environmental compatibility
Higher performance, higher cost
Detailed Performance Comparison
| Performance Factor | PureStalk C-Series (PLA) | PureStalk M-Series (PHA) |
|---|---|---|
| Temperature Range | 32-120°F (0-49°C) | 32-150°F (0-66°C) |
| Cold Beverages | Excellent (water, soda, iced coffee, juice) | Excellent (same performance) |
| Warm Beverages | Good up to 120°F (warm tea, coffee) | Excellent up to 150°F (hot tea, hot chocolate) |
| Hot Weather Performance | Standard (avoid storage above 120°F) | Better (stable up to 150°F) |
| Structural Integrity | 24+ hours in cold liquids, crush resistant | 24+ hours across full temp range, crush resistant |
| Visual Appearance | Milky white, smooth finish | White, smooth finish |
| Taste & Odor | Neutral (no taste transfer) | Neutral (no taste transfer) |
| Base Polymer | PLA (Polylactic Acid) with 15% PHA in CelluMeld™ | PHA (Polyhydroxyalkanoate) |
| Certified Raw Material | NatureWorks Ingeo™ PLA resin, BPI-certified for industrial composting (ASTM D6400) | Danimer PHA resin, TÜV OK compost HOME & INDUSTRIAL, OK biodegradable MARINE, OK biobased |
| Industrial Composting | Designed for commercial facilities | Designed for commercial facilities |
| Home Composting | Not designed for home systems | Designed for home composting |
| Soil Degradation | Limited | Designed for soil environments |
| Marine Environment | Not designed for marine settings | Designed for marine degradation |
| Cost Premium vs Plastic | +20-30% | +40-50% |
| Cost Relative to Each Other | Base cost | +20-30% vs C-Series |
| Supply Availability | High volume, consistent stock | Available, moderate volume |
Use Case Recommendations
Choose C-Series For:
Standard Restaurants and Cafes
Cold drinks (water, soft drinks, iced coffee, juice) served indoors with normal AC. C-Series gives you the same performance as plastic at the lowest price for high-volume service.
Fast-Casual Chains
Quick turnover, cold or room-temperature drinks. Cost matters at scale, and C-Series performs the same as plastic in these conditions.
Institutional Foodservice
Schools, hospitals, and corporate cafeterias serving mostly cold drinks. C-Series fits tight budgets while still meeting sustainability goals.
Choose M-Series For:
Hot Beverage-Focused Operations
Coffee shops, tea houses, and cafes serving drinks above 120°F. M-Series stays rigid in warm and hot drinks where C-Series would soften.
Outdoor and Hot Climate Service
Poolside bars, beach cafes, and outdoor catering in warm climates. M-Series tolerates ambient temperatures and storage conditions that push C-Series to its limit.
Premium Brand Positioning
Upscale spots that lean into their environmental commitment. M-Series gives you broader compostability and better heat tolerance, which fits a premium menu.
Coastal and Marine-Adjacent Operations
Businesses near waterways that worry about accidental disposal in the ocean. M-Series breaks down in marine conditions, which adds a real safety net.
Cost-Benefit Analysis
When the C-Series Premium Is Worth It
If you serve mostly cold drinks indoors, C-Series gives you full performance at the lowest cost. The 20-30% premium over petroleum plastic shows you care about the environment without hurting margins.
When the M-Series Premium Is Worth It
The extra 20-30% for M-Series makes sense when you:
- Serve drinks above 120°F regularly
- Operate in consistently hot conditions (above 95°F ambient)
- Want your brand to stand for stronger environmental claims
- Have customers who'll pay a small premium for better sustainability
- Want a safety net for waste that might end up outdoors or in waterways
Can You Mix Both Series?
Yes, and many operations do. Common patterns:
- By application. C-Series for iced drinks, M-Series for hot drinks.
- By season. C-Series for indoor summer service, M-Series for outdoor summer catering.
- By venue. C-Series for the main dining room, M-Series for premium bar service.
- By daypart. C-Series for lunch cold drinks, M-Series for morning hot coffee.
Both lines use the same sizes and packaging, so running dual inventory is simple.
Technical Specifications
Both lines share the same physical specs at each size:
| Size | Diameter | Length | Available in Both Series |
|---|---|---|---|
| 5mm | 0.20" (5mm) | 5.5" (140mm) | Yes |
| 6mm | 0.24" (6mm) | 8.3" (210mm) | Yes |
| 8mm | 0.31" (8mm) | 8.3" (210mm) | Yes |
| 12mm | 0.47" (12mm) | 8.3" (210mm) | Yes |
Making Your Selection
A few questions worth thinking through:
- What's the highest temperature drink you serve?
- What's the temperature in your storage and service area?
- How many straws do you go through each month?
- How much do your customers care about environmental claims?
- How tight is your budget on disposables?
If you mostly serve cold drinks indoors and price matters, go with C-Series.
If you serve warm drinks, run hot or outdoor service, or want a premium story, go with M-Series.
If you run multiple service formats or seasons, run both.
Need Help Deciding?
Our team can look at your operation and recommend the line that fits your needs and budget. We can send samples of both so you can test them in your own setup before committing.
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